22 MHz Video Amplifier for
Large Jumbo Picture Tubes
ETV/AN95008
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Abstract
This report is the description of a video amplifier board that is intended for the display of high resolution
TV and VGA images on the Philips large screen picture tubes using the RGB video processor
TDA4780 and the integrated video output amplifier TDA6120. The RGB bandwidth of the total amplifier
circuit is 22 MHz. The TDA4780 video controller is I²C controlled, offers automatic cut-off control and
special features like blue stretching and gamma control.
Note: This report is based upon preliminary data sheets and build with test samples of the
TDA6120. Modifications after the date of issue of this report are possible.
Purchase of Philips I 2C components conveys
a license under the I 2C patent to use the components in the I 2C system, provided the system
conforms to the I 2C specifications defined by
Philips.
© Philips Electronics N.V. 1996
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be
accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial
or intellectual property rights.
2
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
APPLICATION NOTE
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
ETV/AN95008
Author(s):
J.J. Hekker
Product Concept & Application Laboratory Eindhoven,
The Netherlands.
Keywords
Video Amplifier
High Resolution
Blue Stretch
Gamma Control
Cut-off Control
Date: 16th March, 1996
Pages: 35
3
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Summary
This report describes the design of a video amplifier circuit that is intended to drive Philips
picture tubes in the PCALE large screen HR Monitor. The total video amplifier circuit consists
of the TDA4780 RGB video processor and a video output stage using three TDA6120 integrated
output amplifiers.
The (-3dB) RGB video bandwidth of the total amplifier circuit is 22 MHz .
Note: The video amplifier circuit described in this report is built and tested with preliminary
samples of the TDA6120 output amplifier. For this reason this report is considered
"classified".
4
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
CONTENTS
1.
INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
2.
VIDEO AMPLIFIER DESIGN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
2.1
9
The Video Pre-Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1
2.1.2
2.1.3
2.2
2.3
3.
The Video Output Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.1
Power Dissipation of the TDA6120 and Heatsink Design. . . . . . . . . . . . . . . . . . . . . . . . . 12
-
Calculating the power dissipation (static + dynamic) of the TDA6120: . . . . . . . . . . . . . . 12
Measuring the Power Dissipation of the TDA6120 in practise. . . . . . . . . . . . . . . . . . . . . 13
The Interface between TDA4780 and TDA6120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
POWER SUPPLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1
4.
The TDA4780 Video Pre-Amplifier Input Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sandcastle input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Beam Current Limiting (BCL) and TDA6120 Thermal Protection. . . . . . . . . . . . . . . . . . . 10
Performance of the Video Amplifier Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
VIDEO AMPLIFIER BOARD SCHEMATIC DIAGRAMS, LAYOUT AND PARTS LISTS. . . . . . . . . . . . . . 17
4.1
4.2
4.3
4.4
Picture Tube Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video Amplifier Board Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heatsink used on the Video Amplifier Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
17
26
30
5.
ACKNOWLEDGMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.
REFERENCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
APPENDIX 1 SPECIFICATION AND PINNING OF THE INTEGRATED CIRCUITS. . . . . . . . . . . . . . . . . . . . . . 32
APPENDIX 2 SPECIFICATION AND TIMING OF ACCEPTED VIDEO DISPLAY MODES. . . . . . . . . . . . . . . . 34
5
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
LIST OF FIGURES
Fig. 1 Illustration of cut-off limits and power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 2 Video and Sandcastle inputs of the TDA4780 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 3 Beam Current Limiting TDA4780 and Thermal Protection TDA6120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 4 Circuit design TDA6120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 5 Combining the TDA4780 and TDA6120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 6 Power supply for the video board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 7 Video Pre-Amplifier Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 8 Video Pre-Amplifier (TDA4780) Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 9 Video Output Amplifier (TDA6120) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 10 Video Output Amplifier (TDA6120) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 11 Circuit and Connections of Picture Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 12 Video Amplifier Component Side (Ground Plane and Numbers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 13 Video amplifier with TDA4780 and TDA6120 schematic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 14 Video amplifier component placement (numbers). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 15 Video amplifier component placement (values) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 16 Video amplifier SMD placement (numbers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 17 Video amplifier SMD placement (values) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 18 TDA4780 SMD placement (Numbers) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 19 TDA4780 SMD Placement (Values) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 20 TDA6120 SMD Placement (Numbers) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 21 TDA6120 SMD Placement (Values) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fig. 22 Heatsink for the TDA6120Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
9
10
11
15
15
16
16
16
16
17
18
19
20
21
22
23
24
24
25
25
30
LIST OF TABLES
TABLE 1 Pin Description of the TDA4780 Video Processor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TABLE 2 Pin Description of the TDA6120Q Video Output Amplifier (Preliminary data). . . . . . . . . . . . . . . . . . . . 33
TABLE 3 Performance Demands of an Asymmetrical Video Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
1.
Application Note
ETV/AN95008
INTRODUCTION.
This report describes the video amplifier circuitry incorporating combination of the RGB video
processor TDA47801 and the TDA61202 integrated video output amplifier. It contains the circuit
diagram, PCB layout and parts list.
The amplifier board is designed to drive TV tubes in a high demanding market of HR monitors*. This
means that the required bandwidth of the video amplifier has to meet the following standards:
VGA, SVGA, XGA, MUSE and other High Resolution sources.
A split is made for two different video boards.
•
One video amplifier board design for typical TV application, using the combination TDA4780
(monolithic RGB processor) and TDA6120. This combination has a total RGB bandwidth of
22 MHz and is suitable for TV, MUSE, VGA (SVGA and XGA with limited performance) and
HDMAC images. It features automatic cut-off control, gamma correction and blue stretch.
•
The other video amplifier board is designed for monitor applications, using the combination
TDA48823 video pre-amplifier and TDA6120. This combination has a total RGB bandwidth of
30 - 60 MHz (depending on cathode swing) and is suitable for VGA, SVGA and XGA images.
In this report the combination of the TDA4780 and the TDA6120 for TV/VGA applications is described.
The video amplifier board with the combination of the TDA4882 and the TDA6120 is described
separately in report ETV/AN950074.
Erratum:
*
With the present bandwidth limiting capacitors C40, C41 and C42 the rise cq. fall time of
the input signals is limited to 33 ns. For a better video bandwidth performance, the
capacitors C40, C41 and C42 should be reduced in value from 150 pF to 56 pF (limiting
the rise cq. fall time to 18 ns). When this alteration is made, the speed-up capacitors
C101, C201 and C301 should be reduced in value from 22 pF to 15 pF.
HR = High Resolution.
7
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
2.
Application Note
ETV/AN95008
VIDEO AMPLIFIER DESIGN.
For the total video board the following design functions and parameters are realised:
(For the specification of the TDA6120, the relevant data is given in appendix 1 table 2, this data is
based on preliminary data sheets and test samples of the TDA6120)
-
-
Two RGB Video inputs 0.7 Vpp signal amplitude (in 75 Ω)
Luminance input 0.45 Vpp (or 1.43 Vpp, can be selected through I²C)
Colour difference input
-(R-Y) 1.05 Vpp
-(B-Y) 1.33 Vpp
Contrast control
Brightness control
RGB Black level control
Automatic cut-off control
RGB Gain control
I²C control
Video Output Stages supply voltage of 200 Volt
Highest cut-off level 160 Volt (Specification for Philips large screen picture tubes)
Maximum output swing 150 Volt (120 Volt video drive and 30 Volt cut-off adjustment range)
Bandwidth minimum 22 MHz / 125 Volt (limited by RGB bandwidth of the TDA4780)
The video output stage ranges are illustrated in Fig. 1.
-
The connector pinning is compatible with the other board designs for the HR monitor series.
+200 Vidd
Maximum Output Voltage of the TDA6120
+190 Volt
Ultra Black Range
+160 Volt
130 - 160 Volt Cut-Off Range
+130 Volt
Maximum drive 120 Volt
Minimum Output Voltage of the TDA6120
+10 Volt
0 Volt
Fig. 1 Illustration of cut-off limits and power supply.
8
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
2.1
Application Note
ETV/AN95008
The Video Pre-Amplifier.
The pinning of the TDA4780 is given in appendix 1 table 1. The supply voltage is 8 Volt.
2.1.1
The TDA4780 Video Pre-Amplifier Input Circuit.
R2
R32
C2
100E
100n
R2
R33
C3
100E
100n
R34
9
R1
75E
R36
C6
100n
R6
R37
C7
100E
100n
75E
R7
R38
C8 75E
J3
FSW2
100n
D14
R14
SANDC
1k
BAV99
6
3-level sandcastle
100n
R13
13
75E
FSW1
C10
R40
R41
100E
R10
100n
100E
C11
10
27
R27
100E
11
100n
R11
28
R28
100E
C12
R42
SDA
SCL
12
100E
R12
CLMP
4k7
5
8
100E
75E
G1
B1
SUPPLY
7
R8
R1
BLNK
R47
GROUND
C5
1
75E
100E
R49
4k7
100n
R4
-(R-Y)
Y
14
+8V
4
100E
-(B-Y)
SANDC IN
2
3
R3
C4 75E
75E
G2
B2
2-level sandcastle
IC2 TDA4780
C40
C42
C41
150p
150p
150p
100n
R10, R11, R12 = (75E) Optional
Do Not Place
Fig. 2 Video and Sandcastle inputs of the TDA4780
All the video input signals are terminated with 75 Ω to ground, see Fig. 2 (do not place R10, R11 and
R12, these resistors are usually placed at another position inside the set e.g. at the BNC input
connectors, and therefore not at the video board). The video signals are AC coupled (100 nF SMD) to
the inputs of the TDA4780. Capacitors C40, C41 and C42 are added to limit the bandwidth of the input
signal. This allows for a more optimal design of the speed-up network (R•01, R•03 and C•01 at the
input of the TDA6120) and the SVM circuit (for this circuit see o.a. report ETV/AN930145).
2.1.2
Sandcastle input.
The TDA4780 must have a two- or three-level (selected through I²C) sandcastle signal for operation.
For use in HR monitors the sandcastle generated on the deflection board is not suitable, because of
too much delay. Therefore the 5 Volt blanking and clamping pulses are added with two 4k7 Ω resistors
to form a two level sandcastle. When the HR monitors are used for TV images the standard 3 level
sandcastle can be used. The sandcastle (2- or 3-level) can be selected with jumper J3.
Note: With the two-level sandcastle both blanking and clamping pulse must be present for
operation. When no clamping is present, no blanking or constant blanking is required.
9
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
2.1.3
Application Note
ETV/AN95008
Beam Current Limiting (BCL) and TDA6120 Thermal Protection.
The beam current information is measured at the foot of the EHT winding (see also ETV/AN950066).
This information is offered through a diode and a two resistors to pin 15 (average beam current limiting
input) of the TDA4780. A fast acting, slow restoring beam current limiting system is made by including
a 100 µF capacitor (C26). The initial BCL level is set to approximately 4.2 Volt with resistors R14 and
R16. The BCL information is clipped with a 6.8 Volt zener to prevent overdrive on the TDA4780 input.
VIDD
+8V
BCL
CON9
PIN3
VIDD
R80
10k
D16
1N4148
R48
100E
TDA4780
Pin15
BCL
R84
100E
100n
R81
T1
MPSA92
R14
15k
R15
1k
C80
D2
1N4148
C82
1k
D15
C15 R16
100n 22k
C26
100u
6V3
D302
BAV21
D102
220n
Green
Video
Blue
R83
3k6
T2
MPSA42
D202
BAV21 BAV21
R82
1M
tbf
BZX79C
6V8
R210
47E
C210
Amp.
Red
C81
220u
16V
TDA6120
Fig. 3 Beam Current Limiting TDA4780 and Thermal Protection TDA6120
The network with transistors T1 and T2 is added for thermal protection of the TDA6120.
The current through resistor R•10* is a good representation of the total dissipation (Ptot = Pdyn + Pstat) of
the TDA6120. This information can be used by the thermal protection circuit, as shown in the network
around T1 and T2, to pull down the contrast level when the expected dissipation exceeds a certain
level. With the resistor values indicated in Fig. 3 (47 Ω) the voltage over resistors R•10 is limited to
1.2 Volt (by limiting the current through R•10 to approximately 30 mA). This results in a ∆T (with the
used heatsink of Fig. 22) of approximately 27 °C.
The capacitor C81 (C82 is optional) is used to include a time constant to prevent visible background
modulation and loop instability.
*
R•10 means this resistor is numbered as R110, R210 or R310 for respectively the Red, Green or Blue output stage.
10
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
2.2
Application Note
ETV/AN95008
The Video Output Amplifier.
The video output stage is built around the TDA6120 integrated video output amplifier.
The TDA6120 has a small signal bandwidth of 60 MHz and a large signal bandwidth of 30 MHz. The
peripheral circuit around the TDA6120 is shown in Fig. 4. The pinning is given in appendix 1 table 2.
REF
R35
R104C
10E
20E
C101
100n
C104
22p
R101 R103
560E 560E
4 VIN+
1 RC3 RC+
RED
R102C
2VIN-
20E
R112
12
GND 8
OUT 15
OUTC
220E
COMPOSITE
D103
BAV21
R113
18k
PR02
IIN
13
Vdd
10
47E
100n
200V
RED feedback
Vcc
Resistors numbered R***C are a
combination of resistors
e.g. R107C=R107+R44
R106
6
IC101
TDA6120
VIDD
C109
100n
250V
7 OUTM
1k
D101
BAV21
R110
C110
R107C
RED cathode
C105
C106
220n
220n
33E
+13V
Fig. 4 Circuit design TDA6120.
The main features of the TDA6120 are (data based on preliminary data sheets and test samples of the
TDA6120):
-
Large signal bandwidth of 30 MHz at 125 Vpp
Small signal bandwidth of 60 MHz at 60 Vpp
Rise/fall time of 12.5 ns for 125 Vpp
Slew rate of 10 V/ns
Static power dissipation of 3.5W at 200 Volt supply (each device)
Bandwidth independent of voltage gain
Maximum overall voltage gain over 46dB
Differential voltage input
Fast cathode current measurement output for dark-current control loop.
High power supply rejection ratio.
The reference of the TDA6120 (VIN+) is 3.9 Volt, see also paragraph 2.3. The output voltage of the
TDA6120 is fixed with a feedback resistor R•13. With the value of resistor R•13 = 18 kΩ, an ultra black
level of 180 Volt and no differential input voltage, the output voltage of the TDA6120 is 90 Volt.
11
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
2.2.1
Application Note
ETV/AN95008
Power Dissipation of the TDA6120 and Heatsink Design.
In the circuit described in this report, the bandwidth of the video path is limited by the video preamplifier, the TDA4780. The -3dB bandwidth of this IC is 22 MHz. In practise this means that the
maximum worst case condition will be reached around 22 MHz with an amplitude of 100 Volt (The
amplitude is limited by a combination of bandwidth, beam current limiting and voltage output of the
TDA4780).
In the first part of this paragraph the theory on calculating the dissipation and temperature rise
of the video amplifiers at normal conditions (pixel on/off at 22 MHz at 100 Volt cathode drive
voltage, amplitude is limited by the beam current limiting circuit) is explained.
In the second part the more practical approach of driving the TDA6120 to its worst case
condition (a combination of maximum output times maximum frequency) is used.
Note: These worst case conditions are only reached with the thermal protection circuit disabled.
Calculating the power dissipation (static + dynamic) of the TDA6120:
The static dissipation (Pstat) of the TDA6120 (datasheet) is due to supply currents and currents in the
feedback network and CRT, and can be calculated with equation (1):
(1)
and:
Vidd
Vcc
= 200 V
= 15 V
Idd
Icc
= 14.7 mA
= 37 mA
(from preliminary data)
(from preliminary data)
is Pstat = 3.5 Watt
The dynamic dissipation (Pdyn) of the TDA6120 can be calculated with equation (2):
(2)
and:
Cl
Cf
Cint
f
Vo,pp
b
= load capacitance (= Ctube + Csocket + Csparkgap + 2 x Cdiode + 2 x CflashR + Ctraces
= 4 + 1 + 0.5 + 1.5 + 3 + 0.75 ≈ 11 pF)
= feedback capacitance (≈1.5 pF)
= effective internal load capacitance (≈ 7 pF, estimate)
= frequency
= peak to peak output voltage (≈ 100 Volt at 22 MHz normal operation)
= non blanking duty-cycle (≈ 0.8)
The capacitances indicated in above formula are an educated guess of the capacitance present in the
board design and the video end amplifier.
then Pdyn = 6.9 Watt
12
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Thermal parameters of the TDA6120 and heatsink:
Rth,j-mb
Rth,mb-hs
Tj,max
Ths, max
Tamb,tv
=
=
=
=
=
2.0 K/W
0.5 K/W
150 °C (473 K)
105 °C (368 K)*
65 °C (338 K)
(Thermal resistance junction to mounting base)
(Thermal resistance mounting base to heatsink)
(Maximum junction temperature)
(Maximum temperature heatsink)
With the total dissipation of 10.4 Watt under normal operating conditions and the thermal parameters
of the TDA6120, the thermal resistance of the required heatsink for the maximum temperatures
allowed can be calculated with equations (3) and (4).
(3)
With (3):
The maximum junction temperature allowed is 150 °C at 10.4 Watt. This means that the
thermal resistance of the heatsink must be smaller than 5.7 K/W.
(4)
With (4):
The maximum heatsink (board) temperature allowed is 105 °C at 10.4 Watt. This
means that the thermal resistance of the heatsink must be smaller then 3.8 K/W.
The required heatsink area can be derived from the heatsink design nomogram published by PHILIPS
COMPONENTS7. For a thermal resistance of 3.8 K/W the required heatsink area is 100 cm². With this
heatsink the calculated (equation (3)) maximum junction temperature at 10.4 Watt is < 130 °C (Tamb =
65 °C).
On the pc board described in this report, a standard heatsink (shown in Fig. 22) is used. This heatsink
has an Rth,hs of 5.6 K/W natural convection (3.75 K/W in continuous air flow). With this heatsink the ∆T
under maximum dissipation (10.4 Watt) is 59 °C. The heatsink temperature will rise to 124 °C and the
junction temperature to 150 °C.
With the above results in mind it is recommended that, to prevent derating of pcb material and for
safety, the thermal protection circuit as shown in Fig. 3 is used to limit the heatsink temperature to a
maximum of 100 °C (a ∆T of 35 °C).
To verify the calculated dissipation and temperature behaviour of the video board, the board has been
tested in a HR monitor.
*
The maximum allowed temperature for FR-2 printed circuit board material is 100°C, for FR-3 pcb material 105°C and
for CEM-1 pcb material 120°C. The maximum allowed temperature for soldering joints is 100°C.
13
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Measuring the Power Dissipation of the TDA6120 in practise.
All temperature measurements are made with a Minolta infrared temperature sensor at the RED output
stage. The RED output stage is physically positioned above the BLUE output stage and thus suffers
from a higher ambient temperature. The red output stage is driven to a 90 Volt output swing at 20 MHz
(40 MHz pixel frequency; this is the worst case condition that could be reached).
Note: This worst case power dissipation is measured with the thermal protection circuit disabled but
the beam current limiting circuit enabled.
1
The ambient temperature (Tamb) in the (open) set is 26 °C
2
The voltage over resistor R110 is 5.4 Volt, the high voltage supply Vidd = 189.5 Volt.
(5)
3
The voltage over resistor R106 is 1.2 Volt, the low voltage supply Vcc = 12.1 Volt.
(6)
4
The temperature of the heatsink of the RED channel is 75 °C.
With these practical values for the supply voltages and currents, the true dissipation is calculated to be
Ptot = 10.6 Watt (compare calculated total dissipation at 22 MHz/100 V ≈ 10.4 Watt).
With the above practical measurements, and the measured ambient temperature Tamb = 26 °C, and a
realistic thermal heatsink resistance Rth,hs = 5.6 K/W, a theoretical value for ∆T can be calculated with
equation (7).
(7)
In practise a value of ∆T = 49 °C is found.
Conclusion:
In any case the PC-board and the TDA6120 junction temperature must be protected by a thermal
protection circuit as given in Fig. 3. With the resistor values indicated in Fig. 3 the ∆T of the heatsink is
limited to 27 °C (by limiting the voltage over R•10 to 1.2 Volt). In practise the maximum heatsink
requirements are lower than those calculated under worst case conditions so that a smaller heatsink
can be used.
By adapting the resistor values the thermal protection circuit can be optimised for other heatsink sizes.
Warning: The used heatsink must have an Rth,hs < 11.4 K/W because of the quiescent Pstat = 3.5 Watt.
14
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
2.3
Application Note
ETV/AN95008
The Interface between TDA4780 and TDA6120.
TDA4780
TDA6120
+3.9V
R35
R104C
10E
4
10E
C104
C101
100n
1
19
RED OUT
24
RC-
22p
R101
R103
560E
560E
OUTC
3
FEEDBACK
VIN+
R107C
7
1k
R102C
2
12
CATHODE
RC+
OUTM
VIN-
10E
Fig. 5 Combining the TDA4780 and TDA6120.
The output signals (R, G, B) of the TDA4780 are between 2 Vpp (typical output voltage difference Black
to White level) and a maximum of 3.3 Vpp. This means that to achieve the maximum output amplitude
of 150 Vpp at the cathode, the amplification ratio of R•13 over R•03/2 must be > 45. This is done by
choosing the value for R•03 = 560 Ω. The value for R•13 = 18 kΩ is fixed (for this see paragraph 2.2).
3.
POWER SUPPLY.
The supply voltages for the video amplifier board are (see also Fig. 6);
- 200 Volt (100 mA) for the TDA6120 (high voltage) video drive with R71 = 10 Ω in series.
- 13 Volt (100 mA) for the TDA6120 (low voltage) through R73 = 3 x 68 Ω // and D73, a 13 Volt zener.
- 8 Volt (100 mA) for the TDA4780 supply through R5 = 22 Ω and a (IC1 = µA7808) voltage regulator.
- 3.9 Volt (14 mA) for the TDA6120 (reference level) through R9 = 820 Ω and D9, a 3.9 Volt zener.
VIDD
3 x 68E
R73B
+16V
R5
22E
PR02
R9
820E
PR01
IC3
7808
C1
C20
100u 100n
25V
R73A
+3.9 V
+8V
C22
C13
C14
100n
100u
25V
100n
C9
R71
10E
NFR25
R73C
+13V
+200V
D2
C72
C73
100u BZX79C
25V 3V9
100n
100u BZX79C
13V
25V
D73
C71
10u
250V
Fig. 6 Power supply for the video board.
Note: Before connecting the video board make sure that both capacitors on the 200 Volt supply, on
the SMPS board and C71, are discharged. When this is not done this can result in a fused
(R71) resistor.
15
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
3.1
Application Note
ETV/AN95008
Performance of the Video Amplifier Board.
The video amplifier board was tested in a HR monitor. It is connected to an RGB signal generator with
high performance 75 Ω coaxial cable, terminated at the video board with 75 Ω to ground. The four
oscilloscope traces are obtained with a Tektronic 500 MHz Digital Oscilloscope.
The input signal rise and fall times, measured on the video board with a 10:1 probe, are shown in
Fig. 7. For a link to the f-3dB bandwidth see equation (1), appendix 2; specification of video modes.
Fig. 7 Video Pre-Amplifier Input Signal.
200 mV / div : 10 ns / div
Fig. 8 Video Pre-Amplifier (TDA4780) Output.
500 mV / div : 50 ns / div
The output signal of the TDA4780 to the TDA6120 is shown in Fig. 8. The contrast is set for a cathode
output voltage swing (black to white) of 60 Volt (Fig. 9) and 125 Volt (Fig. 10), the waveform is
measured using a 2.4 pF 100:1 Philips probe. The output of the TDA6120 is measured on the cathode.
Fig. 9 Video Output Amplifier (TDA6120) Signal.
10 Volt / div : 50 ns / div
Fig. 10 Video Output Amplifier (TDA6120) Signal
20 Volt / div : 50 ns / div
The difference in rise and fall times is caused by the speed-up networks. With the output voltage swing
of 60 Volt, the 10% to 90% fall time (black to white) is 15.4 ns and the rise time is 20.1 ns, with an
overshoot of 17 %. As can be deducted from table 2 appendix 2, these results relate to an excellent
performance at 22 MHz pixel frequency down to an acceptable performance at 45 MHz pixel
frequency.
16
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
4.
4.1
Application Note
ETV/AN95008
VIDEO AMPLIFIER BOARD SCHEMATIC DIAGRAMS, LAYOUT AND PARTS LISTS.
Picture Tube Drive.
For Electro Magnetic Compatibility reasons, part of the connections to the picture tube go via this
picture tube board. Since these lines include Vg1, heater voltage and Aquadag connection it will be
clear that precautions must be taken to prevent flash over energy from destroying the sensitive
electronics.
EHT
FOCY
FOCX
RED
6
GREEN
11
BLUE
Vff
8
R75
5E6
PR01
L75
10u
R74
1k
Vffg
J2
L76
10u
R76
10
AQUA
C75
R78
220p
500V
1k5
COMPOSITE
Vg2
C78
1nF
2kV
1k
Vg1
12
9 5 7
C79
R79
2k7
COMPOSITE
4n7
1kV
C77
AQUA
J1
1nF
2kV
Fig. 11 Circuit and Connections of Picture Tube
The value of heater resistor R75 lies between 2Ω2 and 6Ω8 (dependent on the tube type; for example,
a value of 5Ω6 is found for the 29" SF picture tube). It is recommended to optimise resistor R75 for the
optimal heater voltage of 6.15 Vrms.
4.2
Video Amplifier Board Design.
The final design of the video amplifier board is made on double sided PC-board. Special efforts have
been made to keep all current loops (carrying high di/dt signals) as small as possible. This is visible in
the copper area shown in Fig. 12 and Fig. 14.
On the board there is an option to terminate all grounds (AQUA, GND and Vffg) to the same ground
(GND) pin 7 of connector 8 by means of the jumpers J1 and J2 next to capacitor C75 and coil L75.
With the HR monitor design the placement of both jumpers gave the best results.
17
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Fig. 12 Video Amplifier Component Side (Ground Plane and Numbers)
18
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
+30V
+16V
CLMP
GND
Vsync
GND
Hsync
Hsync
Vsync
BCL
GND
SANDC
n.c.
SDA
SCL
BLNK
CON14
1
+30V
2
+16V
3
4
Red component numbers 1**
5
6
7
R9
820E
PR01
CON9
1
22E
PR02
R47
4K7
10E
C9
2
D16
3
IC1
7808
C1
1N4148
4
+8V
C20
100u 100n
25V
R48
100E
5
C22
C13
100n
100u
25V
D9
R108
R104
10E
10E
C104
100n
22p
R101 R103
560E 560E
12
1
15
D103
BAV21
R113
18k
PR02
3
FOCX
FOCY
EHT
13
R111
tbf
7
8
R102
R105
9
10
R32
9
R2
8
75E
R3
7
5
75E
R4
4
75E
6
R33
R34
100E
2
27
C3
100n
3
26
C4
100n
4
25
C5
100n
5
R36
C6
100E
C7
100E
R38
C8
100E
2
1
R6
R7
R8
C40
75E 75E 75E
C41 150p
150p
C42
4K7
4K7
+8V
IC2
24
TDA4780
6
23
100n
7
22
8
21
9
20
10
19
C11
100n
11
18
C12
100n
12
17
14
15
3
R42
100E
R40
100E
R41
100E
2
D14
BAV99
1
1
C23
10E
R-OUT
220n
R22
G-OUT
C21
10E
1u
+8V
R20
3
4
5
6
3 x 75E Optional
Do Not Place
R12
R11
R10
R44
R107
470E
470E
R110
10
200V
D101
BAV21
10 9 5 7
12
AQUA
D102
BAV21
100n
200V
C77
C109
100n
250V
6
R118
tbf
R29
C105
3E3
C106
220n
220n
R31
330n
10E
R43
+8V
10u
250V
220p
3
C19
1k
L76
12u
R19
100K
4p7
LARGE
SIGNAL
GROUND
(TDA6120)
C82
R84
D2
100E
1N4148
tbf
J2
8
C78
9
10
1n
1k5
COMPOSITE
2kV
J1
VIDSUP
N.C.
+16V
+30V
Vff
Vff-GND
GND
AQUA
Vg1
Hflyb
R79
R81
10k
T1
MPSA92
R82
1M
R83
3k9
5
6
Vg2
C80
100n
C75
C79
220p
4n7
1kV
R80
C81
220u
16V
2k7
COMPOSITE
R73A
R73B
1k
PR37322 J.J.H.
6 MAY 1996
Product Concept & Applcation Laboratory Eindhoven
T2
MPSA42
4
R75
PR01
7
R78
200V
SMALL
SIGNAL
GROUND
(TDA4780)
3
+16V
+30V
1k
L75
12u
R76
Blue component numbers 3**
470E
BZX79C
6V8
2
R74
Green component numbers 2**
10E
R45
CON8
1
C71
C111
470E
R39
100n
D15
1n
2kV
10E
NFR25
+13V
0E
C17
R71
200V
R106
Fig. 13 Video amplifier with TDA4780 and TDA6120 schematic diagram.
19
8
6
11
33E
C110
7
tbf
B-OUT
1
D19
BAV99
2
R112
220E
COMPOSITE
R119
tbf
2
1k
8
IC101
TDA6120
C107
1u C15
R15
R14
C26
R24
220n
75E
J3
100u
6V3
220n
C16
16
2
tbf
C18
13
10E
C102
10E
100n
R13
15k
R16
22k
100E
C25
100n
100n
R27
R109
tbf
100E
C10
150p
R46
R49
28
75E
C2 100n
R37
10E
R28
100E
100E
3
CON10
4
C101
6
CON10SUB
R1
GND
G1
GND
B1
GND
C14
100u 100n BZX79C
25V
3V9
R1
R1
GND
G1
GND
B1
GND
B-Y
R-Y
Y
GND
R35
R5
R73C
+13V
3x120E
C72
D73
100n
C73
BZX79C 100u
13V
25V
+16V
R28
R27
IC1
C1
R2
GND
G2
GND
B2
GND
B-Y
R-Y
Y
GND
R5
R9
+
D9
R35
C9 R31
R38
R46
IC2
R39
R20
D201
D203
BNC1 BNC2 BNC3 R84
CON10
D15
AQUA
J4
C111
C211
C311
CON14
PRODUCT CONCEPT
&
APPLICATION
PCALE LABORATORY
PR37322
EINDHOVEN
R212
BLUE
C78
D202
R49
R47
R32
R33
R34
CON10SUB
R36
R37 J3
C13
+
RED
VG2
GREEN
J5
R112
PRODUCT CONCEPT
&
EINDHOVEN
APPLICATION LABORATORY
4 JUNE 1996
PR37322
R78
HEAT2
+
CON9
R312
R213
R43
R1
R113
D103
R313
CON8 J1
L75
C79
D303
R75
C109
IC101
J2
C71
L76
C309
IC301
R210
BLNK
SCL
SDA
N.C.
SAND
GND
BCL
VS
HS
R48
R44
R40
R41
R42
G1
IC201
D16
R310
T1
C83
R82
R83
T2
C81
R81
R80
D302
PR37322
HEAT1
R110 D102
HEAT3
+
D101
D301
C75
R45
B1
GND
R1
GND
GND
G1
GND
GND
B1
GND
R71
Hfb
Vg1
AQUA
GND
Vffg
Vff
+30V
+16V
N.C.
VIDD
C77
R79
HS
GND
VS
GND
CLMP
+16V
+30V
+
C209
D2
C73
+
R73A
R73C
R73B
20
D73
Fig. 14 Video amplifier component placement (numbers).
+
R2
GND
G2
GND
B2
GND
B-Y
R-Y
Y
GND
100u
25V
PRO2
22E
100u
25V
+
100E
100E
uA7808
PR02
+
9-PIN
4k7
100E
100E
100E
100E
100E
100E
10E
PR02
18k
BNC
TDA4780
47E
10E
BNC
6-PIN
BNC
BZX79C6V8
220p
TPECNOC TCUDORP
&
N
O
I
T
A
CILPPA
PCALE
Y
R
O
T
A
PR37322ROBAL
NEVOHDNIE
220p
470E
10u
1kV
4n7
GREEN
220E
5E6 PR01
10u
100n
250V
1M
100n
1k
BAV21
MPSA92
10k
BAV21
3k6
MPSA42
220u
16V
250V
10u
10-PIN
2kV
1n
RED
100n
7-PIN
220p
1k5
100E
47E
10E
BAV21
4k7 1N4148
4k7
BZX79C3V9
25V
470E
G1
100u
470E
100E
820E
220E
BLUE
1n
2kV
TDA6120Q
BLNK
SCL
SDA
N.C.
SAND
GND
BCL
VS
HS
10-PIN
BAV21
100E
PR02
18k
BAV21
220p
250V
HS
GND
VS
GND
CLMP
+16V
+30V
100E
R1
220E
2k7
PR02
18k
BAV21
BAV21
BAV21
TDA6120Q
47E
TDA6120Q
47E
10E
BAV21
100E
+
NFR25
Hfb
Vg1
AQUA
GND
Vffg
Vff
+30V
+16V
N.C.
VIDD
B1
GND
R1
GND
GND
G1
GND
GND
B1
GND
+
22373RP
1N4148
250V
68E
PRODUCT CONCEPT
&
EINDHOVEN
APPLICATION LABORATORY
4 JUNE 1996
PR37322
68E
21
100u
25V
+
Fig. 15 Video amplifier component placement (values)
68E
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
BZX79C13V
100n
Philips Components
Application Note
ETV/AN95008
Philips Components
Application Note
ETV/AN95008
R3
R4
C205
C14
C3
C4
C5
D19
C8
R29
D14
C18
R201 C201
R16
C15
C17
C16
+
C10
C40
C11
C41
C12
C42
R10
C204
C7
R14
R207
R203
C6
C21
R11
R22
R13
R12
R24
R208
C26
R205
R204
C19
R202
R19
R219
C2
C25
C23
R211
R218
C207
C206
C202
R209
R206
C210
R6
R1
R8
R2
R7
C22 C20
PR37322
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
PRODUCT CONCEPT
&
APPLICATION
LABORATORY
EINDHOVEN
R15
C304
C105 C106
R74
C110
R307
R304
R302
R319
C307
R303
R311
R318
R308
C301 R301
C302
C102
R109
R102
R119
R309
R104
R118
R103
R111
R305
R107
C101 R101
C107
R108
R105
C104
R76
C305 C306
C310
R306
R106
C82
C72
Fig. 16 Video amplifier SMD placement (numbers)
22
Philips Components
Application Note
ETV/AN95008
75E
75E
75E
75E
100n
75E
75E
100n
PR37322
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
75E
100n
100n
100n
BAV99
100n
150p
100n
150p
100n
150p
75E
1u
100n
330n
BAV99
1u
0E
560E 22p
+
75E
100n
75E
220n
PRODUCT CONCEPT
&
APPLICATION
LABORATORY
EINDHOVEN
1k
75E
10E
100u
6V3
10E
10E
4p7
10E
15k
470E
560E
220n
22k
10E
100n
680p
100k
tbf
tbf
10E
100n
220n
tbf
470n 470n
tbf
100n
100n
33E
tbf tbf
100n
200V
tbf
10E
470n 470n
tbf
10E
470E
560E
tbf 10E
tbf
100n
470n 470n 200V
1k
22p 560E
1k
100n
200V
tbf
tbf
tbf
tbf
tbf
10E
10E
470E
560E
tbf 10E
tbf
10E
10E
22p 560E
tbf
100n
100n
33E
33E
tbf
100n
Fig. 17 Video amplifier SMD placement (values)
23
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
R24
R22
R29
C15
C22 C20
C18
C17
C16
R15
C14
C19
R1
C5
D19
R14
C25
R16
C23
C21
R19
D14
R2
R13
C2
C3
C4
C6
C7
C8
C10
C11
C12
R3
CONCEPT
C26
R4
C40
C41
C42
+
R6
R7
R8
R12
R11
R10
Fig. 18 TDA4780 SMD placement (Numbers) Enlarged View.
100n
0E
1u
10E
10E
100n
100n
100n
1u
220n
220n
220n
1k
100k
330n
4p7
22k
15k
75E
680p
BAV99
BAV99
75E
75E
75E
100n
100n
+
75E
75E
100u
6V3
75E
75E
75E
150p
100n
150p
100n
100n
100n
100n
150p
100n
100n
CONCEPT
75E
75E
Fig. 19 TDA4780 SMD Placement (Values) Enlarged View.
24
Philips Components
Application Note
ETV/AN95008
R206
C205
R218
C207
C206
C202
R202
R205
R204
R208
R219
R211
C210
R209
PR
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
R207
R203
C204
R201 C201
PR
Fig. 20 TDA6120 SMD Placement (Numbers) Enlarged View.
33E
tbf
10E
tbf
tbf
470n 470n
10E
tbf
tbf tbf
100n
200V
470E
560E
560E 22p
Fig. 21 TDA6120 SMD Placement (Values) Enlarged View.
25
10E
10E
100n
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
4.3
Application Note
ETV/AN95008
Parts List.
22 MHz VIDEO AMPLIFIER FOR LARGE JUMBO PICTURE TUBES
PR37322
Diodes
Component
value
D2 D16
D9
D15
D14 D19
D73
D101 D102 D103
D201 D202 D203
D301 D302 D303
1N4148
BZX79C3V9
BZX79C6V8
BAV99
BZX79C13V
type
BAV21
12 n.c.
Number
DO35
DO35
DO35
SOT23
DO35
9330-839-90153
9331-176-90153
9331-177-50153
9332-153-70212
9331-178-30133
2
1
1
2
1
DO35
9331-892-10153
9
Integrated Circuits
Component
value
type
T1
T2
MPSA92
MPSA42
PNP
NPN
Component
value
type
IC1
IC2
IC101 IC201 IC301
µA7808
TDA4780
TDA6120Q
12 n.c.
Number
1
1
Integrated Circuits
12 n.c.
8 Volt regulator
RGB pre-amplifier
Video output amplifier
Number
1
1
3
Miscellaneous
Component
value
type
J1 J2
J3
J4
J5
Wire 1E
3-pin jumper
Wire 6E
Wire 4E
Wire
BNC1 BNC2 BNC3
Coax terminator
CON8
CON9
CON10B
CON10
CON14
10-PIN
9-PIN
10-PIN
6-PIN
7-PIN
L75 L76
10µ
SOCKET
DAF-SOCKET
26
12 n.c.
Number
Wire
Wire
2
1
1
1
2 Legs vertical mount
3
CON10
CON9
CON10
CON6
CON7
1
1
1
1
1
COIL
2
CRT_DAF
1
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
PARTS-LIST
22 MHz VIDEO AMPLIFIER FOR LARGE JUMBO PICTURE TUBES
PR37322
Electrolytic Capacitors
Component
value
range
12 n.c.
Number
C1 C9 C13 C73
C71
C81
100u
10u
220u
25V
250V
16V
2222-037-90047
2222-044-63109
2222-037-56221
Component
value
type
C26
100u
6V3
Component
value
range
12 n.c.
C83
C109 C209 C309
100n
100n
63V
250V
2222-370-??104
2222-370-35104
Component
value
range
12 n.c.
C75 C111 C211 C311
C77 C78
C79
220p
1n
4n7
500V
2kV
1kV
2222-655-03221
value
type
100n
100n
1u
330n
4p7
220n
tbf
22p
tbf
C0805
C1206
C1210
C1206
C0805
C1206
C1812
C0805
C0805
2222-910-16649
2222-591-16641
2222-882-16663
2222-591-16647
2222-861-12478
2222-591-16645
2222-???-?????
2222-861-12229
2222-???-?????
19
2
2
1
1
3
1
3
3
470n
tbf
100n 200V
C1210
C0603
C1812
2222-882-16558
2222-???-?????
2222-944-16649
6
3
3
4
1
1
Electrolytic Capacitors (SMD)
12 n.c.
Number
1
Film Capacitors
Number
1
3
Ceramic Capacitors
Number
4
2
1
Ceramic Capacitors (SMD)
Component
C2 C3 C4 C5 C6 C7
C8 C10 C11 C12 C15
C15 C20 C22 C72
C104 C204 C304
C14 C72
C16 C18
C17
C19
C21 C23 C25
C82
C101 C201 C301
C102 C202 C302
C105 C106 C205
C206 C305 C306
C107 C207 C307
C110 C210 C310
27
12 n.c.
Number
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Resistors (SMD)
Application Note
ETV/AN95008
PARTS-LIST
22 MHz VIDEO AMPLIFIER FOR LARGE JUMBO PICTURE TUBES
PR37322
Component
R1 R2 R3 R4 R6 R7
R8 R13
R10 R11 R12
R14
R15 R74 R76
R16
R19
R22 R24 R102 R104 R105
R108 R202 R204 R205 R208
R302 R304 R305 R308
R29
R101 R103 R201
R203 R301 R303
R106 R206 R306
R107 R207 R307
R109 R111 R118 R119
R209 R211 R218 R219
R309 R311 R318 R319
value
type
12 n.c.
Number
75E
do not place (Optional 75E)
15k
1k
22k
100k
R0805
R0805
R0805
R0805
R0805
R0805
2322-730-??759
2322-730-??759
2322-730-??153
2322-730-??102
2322-730-??223
2322-730-??104
8
3
1
3
1
1
10E
0E
R0805
R0805
2322-730-??109
2322-730-??009
18
1
560E
33E
470E
R0805
R1206
R1206
2322-730-??561
2322-710-??339
2322-710-??471
6
3
3
tbf
R0603
2322-730-?????
16
Resistors (Standard, Non-Flammable and Power)
Component
value
type
R5
R9
R20 R31 R35 R39
R27 R28 R48
R32 R33 R34 R36 R37
R38 R40 R41 R42 R84
R43 R44 R45
R46 R47 R49
R71
R73A R73B R73C
R75
R78
R79
R80
R81
R82
R83
R110 R210 R310
R112 R212 R312
R113 R213 R313
22E
820E
10E
100E
PRO2
PR01
SFR16
SFR16
2322-1??-??229
2322-193-??821
2322-180-??109
2322-180-??101
1
1
4
3
100E
470E
4k7
10E
68E
5E6
1k5
2k7
1k
10k
1M
3k9
47E
220E
18k
SFR25
SFR16
SFR16
NFR25
SFR25
PR01
Carbon Composite
Carbon Composite
SFR16
SFR16
SFR16
SFR16
SFR16
Carbon Composite
PR02
2322-181-??101
2322-180-??471
2322-180-??472
2322-205-??109
2322-181-??689
2322-193-??568
10
3
3
1
3
1
1
1
1
1
1
1
2
3
3
28
12 n.c.
2322-180-??102
2322-180-??103
2322-180-??105
2322-180-??392
2322-180-??479
2322-1??-??183
Number
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Overview of the used components in numerical order.
Capacitors
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C25
C26
C71
C72
C73
C75
C77
C78
C79
C81
C82
C83
C101
C102
C104
C105
C106
C107
C109
C110
C111
C201
C202
C203
C204
C205
C207
C209
C210
100u 25V
100n
100n
100n
100n
100n
100n
100n
100u 25V
100n
100n
100n
100u 25V
100n
100n
1u
330n
1u
4p7
100n
220n
100n
220n
220n
100u 6V3
10u 250V
100n
100u 25V
220p
1n 2kV
1n 2kV
4n7 1kV
220u 16v
tbf
100n 63V
22p
tbf
100n
470n
470n
tbf
100n 250V
100n 200V
220p
22p
tbf
470n
100n
470n
tbf
100n 250V
100n 200V
Capacitors (continued)
Resistors
C211
C301
C302
C304
C305
C306
C307
C309
C310
C311
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R19
R20
R22
R24
R27
R28
R29
R31
R32
R33
R34
R35
R36
R37
R38
R39
R40
R41
R42
R43
R44
R45
R46
R47
R48
R49
R71
R73A
R73B
R73C
R74
R75
R76
R78
R79
R80
R81
220p
22p
tbf
100n
470n
470n
tbf
100n 250V
100n 200V
220p
Connectors
BNC1 Coaxial Terminator
BNC2 Coaxial Terminator
BNC3 Coaxial Terminator
CON8
10-PIN
CON9
9-PIN
CON10B
10-PIN
CON10
6-PIN
CON14
7-PIN
Diodes
D5
D9
D14
D15
D16
D19
D73
D101
D102
D103
D201
D202
D203
D301
D302
D303
1N4148
BZX79C3V9
BAV99
BZX79C6V8
1N4148
BAV99
BZX79C13V
BAV21
BAV21
BAV21
BAV21
BAV21
BAV21
BAV21
BAV21
BAV21
Integrated Circuits
IC1
IC2
IC101
IC201
IC301
µA7808
TDA4780
TDA6120Q
TDA6120Q
TDA6120Q
Wire Wounds
L75
L76
10µ
10µ
29
Resistors (continued)
75E
75E
75E
75E
22E PRO2
75E
75E
75E
820E PR01
Optional 75E
Optional 75E
Optional 75E
75E
15k
1k
22k
100k
10E
10E
10E
100E
100E
0E
10E
100E
100E
100E
10E
100E
100E
100E
10E
100E
100E
100E
470E
470E
470E
4k7
4k7
100E
4k7
10E NFR25
68E
68E
68E
1k
5E6 PR01
1k
1k5 AB
2k7 AB
1k
10k
R82
R83
R84
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R118
R119
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R212
R213
R218
R219
R301
R302
R303
R304
R305
R306
R307
R308
R309
R310
R311
R312
R313
R318
R319
1M
3k9
100E
560E
10E
560E
10E
10E
33E
470E
10E
tbf
47E
tbf
220E AB
18k PR02
tbf
tbf
560E
10E
560E
10E
10E
33E
470E
10E
tbf
47E
220E AB
18k PR02
tbf
tbf
560E
10E
560E
10E
10E
33E
470E
10E
tbf
47E
tbf
220E AB
18k PR02
tbf
tbf
Transistors
T1
T2
MPSA92
MPSA42
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
4.4
Application Note
ETV/AN95008
Heatsink used on the Video Amplifier Board.
37.5
65
M3
M3
11.5
8.75
20
8.75
8.3
11.1
15.2
11.1
ALL MEASUREMENTS
IN MM
8.3
M3
M3
24
Fig. 22 Heatsink for the TDA6120Q
The heatsink shown in Fig. 22 is a standard heatsink that can be found with most manufacturers. The
drilled holes are to be taped with M3.
30
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
5.
Application Note
ETV/AN95008
ACKNOWLEDGMENT.
This project was done with help of the following people:
F. v.d. Zanden
R. v.d. Linden
D. Teuling
J. Hulshof
6.
Mounting PC boards and demo board assembly
Mounting PC boards and demo board assembly
Consultancy
Consultancy
REFERENCES.
1.
TDA4780
IC02b 1995
RGB video processor with automatic cut-off control
and gamma adjust
2.
TDA6120
DATASHEET
Video Output Amplifier
3.
TDA4882
IC02b 1995
Advanced monitor video controller
4.
ETV/AN95007
Video Amplifier for HR Monitor with TDA4882 and TDA6120
by J.J. Hekker
5.
ETV/AN93015
Scan Velocity Modulation for HDTV Monitors
by H.J.C. Büthker
6.
ETV/AN95006
Large Screen Deflection Board
by J.J.M. Hulshof
7.
Technical
Long-life mounting for l.f. power transistors,
Publication 227 PHILIPS COMPONENTS Technical Publication 227
31
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
APPENDIX 1 SPECIFICATION AND PINNING OF THE INTEGRATED CIRCUITS.
The TDA4780.
The TDA4780 is a monolithic integrated circuit with a luminance and a colour difference interface for
video processing in TV receivers. Its primary function is to process the luminance and colour
difference signals. The required inputs are:
-
luminance and negative colour difference signals.
2- or 3-level sandcastle pulse for internal timing pulse generation.
I²C-bus data and clock signals.
TABLE 1 Pin Description of the TDA4780 Video Processor.
Pin
1
2
Function
Parameters
Fast switch 2 input
select Y - CD / RGB1
select RGB2
I²C control bits FSDIS2,FSON2
0.0 - 0.4 Vdc
0.9 - 5.5 Vdc
RED input 2
0.7 Vpp
Pin
Function
Parameters
15
Average beam current limiting input
start brightness reduction
start contrast reduction
2.5 Vdc
4.0 Vdc
Peak limiting storage capacitor
start brightness reduction
start contrast reduction
2.5 Vdc
4.0 Vdc
16
3
GREEN input 2
0.7 Vpp
17
Storage capacitor for leakage current
compensation
4
BLUE input 2
0.7 Vpp
18
Peak dark storage capacitor
5
Supply Voltage Vp
Supply Current
8.0 Vdc ± 10%
100 - 120 mA
19
Cut-off measurement input
maximum charge/discharge current
6
Colour Difference -(B-Y)
75% colour bar
1.33 Vpp
20
BLUE output black to white
maximum output current / amplitude
7
Colour Difference -(R-Y)
75% colour bar
1.05 Vpp
21
Blue cut-off storage capacitor
8
Luminance input Y
I²C control bit YHI = 0
I²C control bit YHI = 1
22
0.45 Vpp
1.43 Vpp
GREEN output black to white
maximum output current / amplitude
9
Ground
Ground
23
Green cut-off storage capacitor
10
RED input 1
0.7 Vpp
24
BLUE output black to white
maximum output current / amplitude
11
GREEN input 1
0.7 Vpp
25
Blue cut-off storage capacitor
12
BLUE input 1
0.7 Vpp
26
Y-output/hue adjust output
YEXH = 1 Hue (DAC 03) set > 28HEX
YEXH = 0 min - max output voltage
13
Fast switch 1 input
select Y - CD
select RGB1
I²C control bits FSDIS1,FSON1
27
0.0 - 0.4 Vdc
0.9 - 5.5 Vdc
32
I²C bus serial data
input/acknowledge output
400 µA
1.7 - 2.3 Vpp nominal
5 mA typical / 3.3
Volt
1.7 - 2.3 Vpp nominal
5 mA typical / 3.3
Volt
1.7 - 2.3 Vpp nominal
5 mA typical / 3.3
Volt
0.85 - 1.15 Vpp
0.05 - 5.50 V
-0.1 - Vp Volt
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
14
Sandcastle pulse input
Horizontal and vertical blanking
Horizontal pulses
2.0 - 3.0 Vdc
4.0 - 4.9 Vdc
Application Note
ETV/AN95008
28
33
I²C bus serial clock input
-0.1 - Vp Volt
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
Two sets of RGB colour signals can also be inserted. The TDA4780 has I²C bus control of all
parameters and functions with automatic cut-off control of the picture tube cathode currents. It
provides RGB output signals for the video output stages. In clamped output mode it can also be used
as an RGB source. The TDA4780 offers two separate RGB video input channels at a (-3dB) bandwidth
of 22 MHz.
The TDA6120.
The TDA6120QQ is a single 30MHz/120Vpp monolithic video output amplifier in a DBS13P (Dil
Bended Sil 13 pins Power) package SOT141RDG using high-voltage DMOS technology, and is
intended to drive the cathodes of a CRT in High Definition TV’s or monitors. The TDA6120 is a new
video output amplifier IC with a small signal (60 Volt swing) bandwidth of 60 MHz and a large signal
(125 Volt swing) bandwidth of 30 MHz.
TABLE 2 Pin Description of the TDA6120Q Video Output Amplifier (Preliminary data).
Pin
Function
Description
typical
min
max
unit
1
RC-
inverting input pre-emphasis network
0
Vcc
V
2
VIN-
inverting voltage input
0
Vcc
V
3
RC+
non-inverting input pre-emphasis
network
0
Vcc
V
4
VIN+
non-inverting voltage input
0
Vcc
V
5
IIN
feedback current input
0
2Vbe
V
6
Vcc
low supply voltage
12
0
24
V
7
OUTM
cathode current measurement output
8
Ground
power ground & heatsink
9
n.c.
10
Vidd
200
0
280
V
11
n.c.
12
OUTC
cathode output
10
Vidd-10
V
13
OUT
feedback current output (Rfb = 20 kΩ)
0
10
mA
5
high supply voltage
34
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
Application Note
ETV/AN95008
APPENDIX 2 SPECIFICATION AND TIMING OF ACCEPTED VIDEO DISPLAY MODES.
With the following formula the desired picture performance (fall time, black to white transition time) can
be calculated (with α = 0.35). The results are shown in table 3.
(1)
TABLE 3 Performance Demands of an Asymmetrical Video Amplifier.
Resolution ; Pixel Frequency / Video Response
Mode
Pixels
Excellent
(pi = 1)
Medium
(pi = 0.75)
Acceptabl
e
(pi = 0.5)
Horizontal
Frequency
(kHz)
Pixel
Frequency
(MHz)
tfall
tfall
tfall
(Hor x Vert)
Vertical
Frequency
(Hz)*
(ns)
(ns)
(ns)
VGA
640 x 480
60
31.5
25
14.00
18.62
28.00
VGA (16:9)**
853 x 480
60
31.5
34
10.29
13.73
20.59
VGA
640 x 480
90
48
40
8.75
11.67
17.50
VGA (16:9)
853 x 480
90
48
54
6.48
8.64
12.96
VGA
640 x 480
120
64
55
6.36
8.47
12.73
VGA (16:9)
853 x 480
120
64
74
4.73
6.31
9.46
SVGA
800 x 600
56
35.4
36
9.72
12.96
19.44
SVGA (16:9)
1067 x 600
56
35.4
48
7.29
9.72
14.58
SVGA
800 x 600
72
48
50
7.00
9.33
14.00
SVGA (16:9)
1067 x 600
72
48
67
5.22
6.96
10.45
SVGA
800 x 600
100
64
69
5.07
6.76
10.14
SVGA (16:9)
1067 x 600
100
64
92
3.80
5.07
7.61
XGA
1024 x 768
87 (i)
35.5
46
7.61
10.14
15.22
XGA (16:9)
1365 x 768
87 (i)
35.5
61
5.74
7.64
11.48
XGA
1024 x 768
60
48
64
5.47
7.29
10.94
XGA (16:9)
1365 x 768
60
48
85
4.12
5.49
8.24
XGA
1024 x 768
80
64
88
3.98
5.30
7.95
XGA (16:9)
1365 x 768
80
64
118
2.97
3.95
5.93
HVGA
1152 x 864
70
64
99
3.54
4.71
7.07
HVGA(16:9)
1536 x 864
70
64
132
2.65
3.54
5.30
*
When (i) then interlaced mode, all others non-interlaced
**
16:9 means square pixels on a 16:9 aspect ratio picture tube.
35
Philips Components
22 MHz Video Amplifier for
Large Jumbo Picture Tubes
WIDE*
*
1848 x 1040
60 (i)
Application Note
ETV/AN95008
31.5
73
4.79
6.39
9.59
The WIDE mode is a computer graphics version of the HDTV mode. This mode is specifically suitable for the display
of for example high resolution Photo CD images.
36