Power Amp Design
PAD116
RAIL TO RAIL OPERATIONAL AMPLIFIER
Rev A
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LOW COST
RAIL TO RAIL INPUT & OUTPUT
SINGLE SUPPLY OPERATION
OPERATION TO ± 5V SUPPLY
HIGH OUTPUT CURRENT – 10A
250 WATT OUTPUT CAPABILITY
100 WATT DISSIPATION CAPABILITY
WIDE SUPPLY RANGE ± 5V – ± 50V
INTEGRATED HEAT SINK AND FAN
TEMPERATURE REPORTING
OVER-TEMP SHUTDOWN
APPLICATIONS
LINEAR MOTOR DRIVE
INDUSTRIAL AUDIO
SEMICONDUCTOR TESTING
VIBRATION CANCELLATION
DESCRIPTION
The PAD116 rail to rail operational amplifier is
constructed with surface mount components to
provide a cost effective solution for many
industrial applications where it is important to
obtain a maximum output signal with limited
supply voltages. The PAD116 can operate with a
power supply voltage as little as ±5V (10V total).
With a footprint only 5.6 in2 the PAD116 offers
outstanding performance that rivals much more
expensive hybrid component amplifiers or rackmount amplifiers. Four-wire programmable
current limit is built-in, but the PAD116 is
compatible with the external PAD121 current limit
accessory module as well. The PAD116 also
features a substrate temperature reporting output,
over-temp shutdown and external compensation.
The amplifier circuitry is built on a thermally
conductive but electrically insulating substrate
mounted to an integral heat sink and fan assembly.
No BeO is used in the PAD116. The resulting
module is a small, high performance turn-key
solution for many industrial applications.
PAD116 MOUNTED IN EVALUATION KIT
A NEW CONCEPT
A critical task in any power amplifier application
is cooling the amplifier. Until now component
amplifier manufacturers often treated this task as
an after-thought, left for the user to figure out. At
Power Amp Design the best heat sink and fan
combination is chosen at the start and becomes an
integral part of the overall amplifier design. The
result is the most compact and volumetric
efficient design combination at the lowest cost. In
addition, this integrated solution concept offers an
achievable real-world power dissipation rating,
not the ideal rating usually cited when the
amplifier case is somehow kept at 25oC. The user
no longer needs to specify, procure or assemble
separate components.
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
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KEY FEATURES
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
PAD116
RAIL TO RAIL OPERATIONAL AMPLIFIER
CIRCUIT & CONNECTIONS
EQUIVALENT CIRCUIT
Cc
*
*
*
3
2
1
4
6
7
5
8
AC +VB +Vcc Cc2 Cc1 TMP GND SD
SUB OUT
9
C2
10 11 12 13 14
+Vs
OUT1
+
C1
VIEW FROM COMPONENT SIDE
-VB
OUT2
-IN +IN -Vcc NC NC OUT NC +IL -IL IC
30 29 28 27 26 25 24 23 22 21 20 19 18
*
*
*
C4
PHASE COMPENSATION
Cc
GAIN
1
470pF
3
220pF
> 10
100pF
SLEW RATE
1.6V/uS
4V/uS
8V/uS
+
RS
-Vs
17 16 15
TO FEEDBACK
& LOAD
C4
* SEE APPLICATION CIRCUITS
FOR OTHER CONNECTIONS
AND FUNCTIONS.
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
AMPLIFIER PINOUT & CONNECTIONS
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
2
European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
PAD116 RAIL TO RAIL OPERATIONAL AMPLIFIER
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
__________________________________________________________________________________
PARAMETER
INPUT
ABSOLUTE MAXIMUM RATINGS
100V
15A, within SOA
100W
175°C
INPUT VOLTAGE
+Vs to −Vs7
± 20V
DIFFERENTIAL INPUT VOLTAGE
TEMPERATURE, pin solder, 10s
300°C
TEMPERATURE RANGE, storage
−40 to 70°C5
OPERATING TEMPERATURE, heat sink −40 to 105°C
TEST CONDITIONS1
OFFSET VOLTAGE
OFFSET VOLTAGE vs. temperature
OFFSET VOLTAGE vs. supply
3
BIAS CURRENT, initial
BIAS CURRENT vs. supply
OFFSET CURRENT, initial
INPUT RESISTANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
COMMON MODE REJECTION, DC
NOISE, referred to input
GAIN
MIN
Full temperature range
± Vs
100kHz bandwidth, 1kΩ RS
92
OPEN LOOP
GAIN BANDWIDTH PRODUCT @ 1MHz
PHASE MARGIN
RL= 100Ω, CC=100pF
100
Full temperature range
60
VOLTAGE SWING
VOLTAGE SWING
CURRENT, continuous, DC
SLEW RATE, AV = −10
SETTLING TIME, to 0.1%
RESISTANCE
IO = 10A
IO = −10A
TRANSITION TIME, off
TRANSITION TIME, on
CURRENT
± output voltage to zero
Zero to normal output
internal currents dumped into load
OUTPUT
CC = 100pF
2V Step
No load, DC
SHUTDOWN
POWER SUPPLY
7
±5
VOLTAGE
CURRENT, quiescent
+VB OUT, -VB OUT, load
THERMAL
Output voltage for accessory modules
4
RESISTANCE, AC, junction to air
RESISTANCE, DC, junction to air
5
TEMPERATURE RANGE, ambient air
TEMPERATURE, shutdown, substrate
FAN, 60mm dc brushless, ball bearing
OPERATING VOLTAGE
OPERATING CURRENT
AIR FLOW
RPM
NOISE
6
L10, life expectancy, 50OC
O 6
L10, life expectancy, 25 C
+Vs−1
−Vs+1
10
6.4
Full temperature range, f ≥ 60Hz
Full temperature range
TYP
MAX
1
20
3
50
20
100
0.1
50
100
4
1
UNITS
mV
μV/OC
μV/V
pA
pA/V
pA
GΩ
pF
V
dB
mVrms
dB
MHz
degree
1
8
2
3
V
V
A
V/μS
μS
Ω
1
2
±6
μS
μS
mA
± 35
32
± 50
38
± 1.5
1.1
1.5
70
V
mA
mA
O
110
C/W
C/W
O
C
O
C
12
150
25
3800
30
45
60
V
mA
CFM
RPM
dB
kHrs
kHrs
−40
O
NOTES:
1. Unless otherwise noted: TC=25OC, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating.
2. Derate internal power dissipation to achieve high MTBF.
3. Doubles for every 10OC of case temperature increase.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
5. Limited by fan characteristics. During operation, even though the heat sink may be at 85OC or more the fan will be at a lower temperature.
6. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increase fan life.
7. +Vs, +Vcc must be connected together. –Vs, –Vcc must be connected together.
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
SUPPLY VOLTAGE, +Vs to −Vs7
OUTPUT CURRENT, peak
POWER DISSIPATION, internal, DC
TEMPERATURE, junction2
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
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European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
RAIL TO RAIL OPERATIONAL AMPLIFIER
COMMON MODE RANGE
OUTPUT SWING
With no load the output voltage of the PAD116 can swing to
either supply voltage rail. As the load current increases the
maximum output swing is reduced, but at 10A output the swing
from the supply rails is less than 1V. This does not include any
voltage drop due to the sensing voltage required for the current
limit circuit to operate.
CURRENT LIMIT
The current limiting function of the PAD116 is a versatile
circuit that can be used to implement a four-wire current limit
configuration or, in combination with some external
components can be configured to implement a fold-over current
limit circuit. The four-wire current limit configuration insures
that parasitic resistance in the output line, Rp, does not affect
the programmed current limit setting. See Figure 1. The sense
voltage for current limit is 0.65V. Thus:
0.65V
IL =
RS
Where IL is the value of the limited current and RS is the value
of the current limit sense resistor.
In addition, the sense voltage has a temperature coefficient
approximately equal to –2.2mV/oC. The fold-over function
reduces the available current as the voltage across the output
transistors increases to help insure that the SOA of the output
transistors is not exceeded. Refer to Application Circuits for
details on how to connect the current limit circuitry to
implement either a four-wire current limit or current limit with
a fold-over function.
In some applications better current limiting protection and a
lower sense voltage may be desired. In this case the PAD116
can be operated with the PAD121 current limit accessory
module. See Figure 3 in the applications section and the
PAD121 data sheet for more details.
COOLING FAN
The PAD116 relies on its fan for proper cooling of the
amplifier. Make sure that air flow to the fan and away from the
heat sink remains unobstructed. The cooling method used is
impingement cooling, which means that cool air is pushed into
the heat sink and warm air is exhausted through the spaces
between the heat sink fins.
MOUNTING THE AMPLIFIER
The amplifier is supplied with four 4-40 M/F hex spacers at
the four corners of the amplifier. Since the male threaded ends
of the spacers extend beyond the amplifier pins the spacers
provide a convenient alignment tool to guide the insertion
of the amplifier pins into the circuit board. Once the
amplifier is seated secure the module with the provided
4-40 nuts and torque to 4.7 in oz [3.8 N cm] max. See
“Dimensional Information” for a detailed drawing. It is
recommended that the heat sink be grounded to the system
ground. This can easily be done by providing a grounded
circuit board pad around any of the holes for the mounting
studs.
TEMPERATURE REPORTING
An analog output voltage is provided (pin 6, TMP)
relative to ground and proportional to the temperature in
degrees C. The slope is approximately -10.82mV/oC. The
output voltage follows the equation:
T = (2.127 ─ V) (92.42)
Where V is the TMP output voltage and T is the substrate
temperature in degrees C.
This high impedance output circuit is susceptible to
capacitive loading and pickup from the output of the
amplifier. When monitoring TMP filter the voltage as
shown in Figure 4. See Applications Circuits.
THERMAL SHUTDOWN
The temperature monitoring circuit automatically turns off
the output transistors when the substrate temperature
reaches 110oC. When the substrate cools down 10oC the
output is enabled once again. The thermal shutdown feature
is activated either by amplifier overloads or a failure of the
fan circuit.
EXTERNAL SHUTDOWN
When pin 8 ( SD ) is taken low (ground) the output stage is
turned “off” and remains “off” as long as pin 8 is low.
When pin 8 is monitored with a high impedance circuit it
also functions as a flag, reporting when the amplifier is shut
down. A “high” (+5V) on pin 8 indicates the temperature is
in the normal range. A “low” (ground) indicates a shutdown
condition. See Application Circuits for details on how to
implement an external shutdown circuit and how to monitor
the shutdown status.
PHASE COMPENSATION
The PAD116 must be phase compensated to operate
correctly. The compensation capacitor, CC, is connected
between pins 4 and 5. On page 6, Typical Performance
Graphs, you will find plots for small signal response and
phase response using compensation values of 100pF and
470pF. The compensation capacitor must be an NPO type
capacitor rated for the full supply voltage (100V). On page
2, under Amplifier Pinout and Connections, a table gives
recommended compensation capacitance values for various
gains and the resulting slew rate for each capacitor value.
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
The PAD116 is a rail to rail operational amplifier. This
means that it works equally well with the input pins biased to
either supply rail or at any voltage in between. The most
common application utilizing this function is the single supply
voltage amplifier where the +IN pin and the –Vs supply pin are
grounded.
PAD116
OPERATING CONSIDERATIONS
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
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European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
PAD116
RAIL TO RAIL OPERATIONAL AMPLIFIER
POWER DERATING
NORMALIZED QUIESCENT CURRENT, IQ (%)
80
60
40
20
0
-40
-20
0
20
40
60
80
AMBIENT AIR TEMPERATURE, TA(OC)
NORMALIZED QUIESCENT CURRENT, IQ(%)
OFFSET VOLTAGE,Vos (mV)
1.8
1.5
1.2
0.9
0.6
0.3
0
-0.3
-0.6
-0.9
-40
-20
0
20
40
60
CASE TEMP, OC
80
100
OUTPUT SWING FROM +Vs OR -Vs, V
98
96
94
105
102.5
120
100
97.5
-40
O
T
0.8
75
=1
J
C
,
T
PU
UT
UT
+O
TP
,
C
-OU
O C,
175
=
5
TJ
2
T J=
O
0.4
-20
0
20
40
60
80
CASE TEMPERATURE, OC
100
120
HARMONIC DISTORTION
2
T
PU
100
107.5
DISTORTION, %
1.2
20
40
60
80
TOTAL SUPPLY VOLTAGE, (V)
QUIESCENT CURRENT VS TEMPERATURE
1
UT
-O
0
110
1.6
0
100
112.5
OUTPUT SWING FROM SUPPLY RAILS
2
QUIESCENT CURRENT VS SUPPLY VOLTAGE
102
100
OFFSET VOLTAGE DRIFT
2.1
104
Av = -10
Cc = 100pF
4Ω LOAD
±Vs = ±40V
1W
W
10
0W
10
0.1
TPUT
O C, +OU
T J=25
0
5
10
OUTPUT AMPS, A
15
0.02
30
100
1k
1000
FREQUENCY, F(Hz)
10k
10000
30k
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
INTERNAL POWER DISSIPATION, PD (W)
100
TYPICAL PERFORMANCE GRAPHS
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
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European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
RAIL TO RAIL OPERATIONAL AMPLIFIER
SMALL SIGNAL RESPONSE
-80
PHASE, Θ(O)
-120
60
40
-160
20
-180
100
90
80
70
60
10
POWER RESPONSE
2.6
100k
100000
FREQUENCY, F(Hz)
2M
1M
1000000
TEMPERATURE OUTPUT
2.4
50
pF
220
C C=
pF
100
C C=
40
30
-200
20k
1k 10000
10k 1000001000000
100k 1M 2M
100 1000
FREQUENCY, F(Hz)
TEMP OUTPUT, VOLTS (V)
1
pF
470
C C=
OUTPUT VOLTAGE SWING, V(p-p)
0
-140
20
2.2
2
1.8
1.6
1.4
1.2
1
10
1000
1k
100k
10000
100000
10k
FREQUENCY, F(Hz)
300k
1kHz sine clipped by standard current limit into 4Ω load
0.8
-40
-20
0
20
40
60
80 100
SUBSTRATE TEMPERATURE, OC
20kHz into 4Ω load, G=-10, Cc=100pF
120
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
80
F
0p
-100
SMALL SIGNAL PHASE RESPONSE
10
c=
C
100
F
0p
10
c=
C
OPEN LOOP GAIN, A(dB)
120
PAD116
PERFORMANCE GRAPHS CONTINUED
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
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European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
RAIL TO RAIL OPERATIONAL AMPLIFIER
PAD116
PERFORMANCE GRAPHS CONTINUED
The oscilloscope display at the left shows
an expanded view of a 1kHz 1.2A p-p
amplifier output signal being interrupted
near the negative peak by a shutdown signal
on Ch2. The Ch1 display shows the output
current going to zero about 2µS after the
shutdown signal goes low. The ringing in
the output signal is due to inductance in the
output line.
SHUTDOWN RESPONSE, POSITIVE
OUTPUT TO ZERO TRANSITION
The oscilloscope display at the right shows
an expanded view of a 1kHz 1.2A p-p
amplifier output signal being interrupted
near the positive peak by a shutdown signal
on Ch2. The Ch1 display shows the output
current going to zero about 0.5µS after the
shutdown signal goes low. The ringing in
the output signal is due to inductance in the
output line.
Pulse Response, Positive to Negative, 4Ω Load
G=-10, Cc=100pF
Pulse Response, Negative to Positive , 4Ω Load
G=-10, Cc=100pF
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
SHUTDOWN RESPONSE, NEGATIVE
OUTPUT TO ZERO TRANSITION
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
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European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
PAD116
RAIL TO RAIL OPERATIONAL AMPLIFIER
SAFE OPERATING AREA
S
1m
S
,3
O
0
C
A
M
B
T
]]
1
]
10S
50S
10
0m
S
]
N
IE
1S
PULSE 3% DUTY CYCLE
3
10
100
SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V)
SAFE OPERATING AREA
The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA
graph presented above serves as a first approximation to help you decide if the PAD116 will meet the
demands of your application. But a more accurate determination can be reached by making use of the
PAD Power™ spreadsheet which can be found in the Power Amp Design website under the Power Tools
tab. While the graph above adequately shows DC SOA and some pulse information it does not take into
account ambient temperatures higher than 30OC, AC sine, phase or non-symmetric conditions that often
appear in real-world applications. The PAD Power™ spreadsheet takes all of these effects into account.
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
10
m
S
0μ
10
10
C
D
OUTPUT CURRENT, Io (A)
20
SAFE OPERATING AREA
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
8
European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
RAIL TO RAIL OPERATIONAL AMPLIFIER
PAD116
DIMENSIONAL INFORMATION
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
Power Amp Design PADXXX
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
9
European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
PAD116
RAIL TO RAIL OPERATIONAL AMPLIFIER
APPLICATION CIRCUITS
IN
RIN
21
IC
30
23
+IL
22
-IL
29
OUT RP
9-11
18-20
RS
FIGURE 1.
4-WIRE CURRENT LIMIT
SD
8
5V
5.1k
2N2907
5V
0
5.1k
2N2222
10k
SHUTDOWN MONITOR
H=SHUTDOWN
TRANSISTOR CIRCUIT
5V
5V
0
SD
8
5V
5.1k
SHUTDOWN MONITOR
H=SHUTDOWN
OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT
FIGURE 2.
EXTERNAL SHUTDOWN WITH MONITOR
RL
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
RF
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
10
European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
PAD116
RAIL TO RAIL OPERATIONAL AMPLIFIER
9
10 11 12 13 14
OUT1
+Vs
PAD116 VIEW FROM COMPONENT SIDE
6
7
8
9
GND
-Vs
NC
+IL
-IL
10
11 12
TO FEEDBACK
& LOAD
+5V OUT
5
-Vs
17 16 15
IC
4
RS
+Vs
3
SD
RESET
OUT
2
1
STATUS
-VB
OUT2
-IN +IN -Vcc NC NC OUT NC +IL -IL IC
30 29 28 27 26 25 24 23 22 21 20 19 18
PAD121 VIEW FROM COMPONENT SIDE
FIGURE 3
USING THE PAD116 WITH THE PAD121
10k
2200pF
6
7 8
TMP GND SD
TMP
MONITOR
MONITOR
2200pF
FIGURE 4
MONITORING TMP AND SD OUTPUTS
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
3
2
1
7
4
6
5
8
AC +VB +Vcc Cc2 Cc1 TMP GND SD
SUB OUT
APPLICATION CIRCUITS
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
11
European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland
RAIL TO RAIL OPERATIONAL AMPLIFIER
PAD116
APPLICATION CIRCUITS
With the three current limit function pins (pins 21-23) dual slope
current limiting can be implemented that more closely approximates
the SOA curve of the amplifier than can be achieved with standard
current limiting techniques. Values for resistors R1-R7 and RS can
be calculated using the PAD Power™ spreadsheet that can be
downloaded from the Power Amp Design web site under the Power
Tools tab.
Power Amp Design ΠPAD116 ΠRAIL TO RAIL OPERATIONAL AMPLIFIER
FIGURE 5
DUAL SLOPE (FOLD-OVER) CURRENT LIMIT
Power Amp Design Π3381 W Vision Dr ΠTucson AZ 85742 ΠUSA ΠPhone (520)579-3441 ΠFax (208)279-5458 ΠWeb Site: http://www.PowerAmpDesign.net
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European Stocking Distributor
Phone: +41 44 730 33 53 / Em‌ai‌l: sa‌le‌s‌@‌cond‌atas‌.‌c‌o‌m / w‌w‌w‌.co‌ndatas‌.c‌o‌m
Rietbachstrasse 7, 8952 Schlieren (ZH) Switzerland