SN3
34063x
D
DC/DC Conveerter Controlller
Descriptioon
The SN34063 is a monolithic control circuiit containing the
t primary fu
unctions requirred for DC-to-DC converters. These deviices
connsist of an inteernal temperatture compensaated referencee, comparator,, controlled duuty cycle oscilllator with an active currentt
lim
mit circuit, drivver and high current
c
output switch. This series was speecifically designed to be inccorporated in Step-Down annd
Steep-Up and Voltage-Invertinng applicationss with a minim
mum number of
o external coomponents.
Feeatures
• Operation froom 3.0V to 400V input.
▲ M
Marking Information
• Low Standbyy Current
• Current Limitting
SN34063 (1
1)
• Output Switch Current to 1.5A
1
YYWW (2))
• Output Voltagge Adjustablee
• Frequency Opperation to 1000kHz
(1)Deevice Code
• Precision 2% Reference
(2)Year & Week Co
ode
Ordering Informat
I
tion
Type NO.
Marking
Package Code
C
SN34063
S34063
SOP-8
8
S
SN34063P
S34063
DIP-8
P Conn
Pin
nection
SOP
P-8
DIP
P-8
KS
SD-I7F021
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SN34063
Block Diagram
Absolute Maximum Ratings
[Ta=25℃]
Characteristic
Symbol
Rating
Unit
Power Supply Voltage
VCC
40
V
Comparator Input Voltage Range
VIR
-0.3~+40
V
Switch Collector Voltage
VC(Switch)
40
V
Switch Emitter Voltage (Vpin 1 = 40 V)
VE(Switch)
40
V
Switch Collector to Emitter Voltage
VCE(Switch)
40
V
Driver Collector Voltage
VC(Driver)
40
V
Driver Collector Current (Note 1)
IC(Driver)
100
mA
Switch Current
ISW
1.5
A
Power Dissipation
PD
500
mW
Operating Junction Temperature
TJ
+150
℃
Operating Ambient Temperature Range
TA
-40~+85
℃
Storage Temperature Range
Tstg
-65~+150
℃
* Note 1 : Maximum package power dissipation limits must be observed.
KSD-I7F021
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SN34063x
Electrical Characteristics
(VCC = 5.0 V, TA = -40℃ to +85℃, unless otherwise specified.)
Characteristic
Symbol
Min
Typ
Max
Unit
Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)
fosc
24
33
42
kHz
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Ichg
24
33
42
uA
Idischg
140
200
260
uA
Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)
Idischg/Ichg
5.2
6.2
7.5
-
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)
VIpk(sense)
250
300
350
mV
Saturation Voltage, Darlington Connection
( ISW = 1.0 A, Pins 1, 8 connected)
VCE(sat)
-
1.0
1.3
V
Saturation Voltage (Note 3)
(ISW = 1.0 A, RPin 8 = 82Ω to VCC, Forced β= 20)
VCE(sat)
-
0.45
0.7
V
hFE
50
120
-
-
IC(off)
-
0.01
100
uA
Vth
1.225
1.210
1.25
1.25
1.275
1.290
V
Regline
-
1.4
5.0
mV
IIB
-
-40
-400
nA
ICC
-
2.5
4.0
mA
OSCILLATOR
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)
OUTPUT SWITCH (Note 2)
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)
Collector Off − State Current (VCE = 40 V)
COMPARATOR
Threshold Voltage
TA = 25°C
TA = -40°C to +85°C
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
Input Bias Current (VIN = 0 V)
TOTAL DEVICE
Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,
VPin 5 > Vth, Pin 2 = GND, remaining pins open)
Note 2 : Maximum package power dissipation limits must be observed.
Note 3 : If the output switch is driven into hard saturation (Non−Darlington configuration) at low switch currents(≤ 300 mA)
and high driver currents (≥ 30 mA), it may take up to 2.0us for it to come out of saturation. This condition will
shorten the off time at frequencies ≥ 30 kHz, and is magnified at high temperatures. This condition does not occur
with a Darlington configuration, since the output switch cannot saturate. If a Non−Darlington configuration is used,
the following output drive condition is recommended:
Forced β of output switch :
IC output
IC driver – 7.0mA
≥ 10
* The 100Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
KSD-I7F021
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SN
N340633x
Ellectrical Characteeristic Cu
urves
103
VCC=5V
Pin7=VCC
Pin5=GND
TA=25℃
tOn
102
tOff
101
100 1
10
102
103
104
20us/DIV
O
Oscillator
Tim
ming Capacitor CT [pF]
T
Time [us]
Fig.33 IE vs. VCE(satt)
Fig.4 IC vs. VCE(sat))
Saturation Voltage VCE(sat) [V]
Saturation Voltage VCE(sat) [V]
1.2
1.6
1.2
0.8
VCC=5V
P
Pin1,7,8=V
CC
P
Pin3,5=GND
TA=25℃
0.4
Darllington Connection
1.0
0.8
VCCC=5V
Pin
n7=VCC
Pin2,3,5=GND
TA=25℃
=
0.6
0.4
0
0
0.2
0.4
0.6
6 0.8
1.0 1.2
0
1.4 1.
.6
0.
.2
0.4
0.6
6 0.8
1.0 1.2
1
1.4 1.6
Collectorr Current IC [A
A]
Fig.66 VCC vs. ICC
Fig.5 TA vs. VIPK(sennse)
400
3.6
Supply Current ICC [mA]
Current Limit Sense Voltage VIPK [mV]
Fo
orced β=20
0.2
Emitter Current IE [A
A]
360
320
280
240
VCC=5V
Ichg=Idischg
200
-50
TA=25℃
=
Pin1
1,5,8=Open
CT=1.0nF
=
VCCC=5V
Pin
n7=VCC
Pin
n2=GND
10
05
2.0
0
0
200mV/DIV
10
F
Fig.2
Timing C
Capacitor Wa
aveform
Oscillator Voltage VOSC [V]
Output Switch On-Off Time tOn-tOff [us]
Fig.1 CT vs. tOn-tOfff
4
3.2
2.8
2.4
2.0
1.6
1.2
CT=1.0nF
Pin7=V
P
CC
Pin2=GND
P
0.8
0.4
0.0
-25
0
25
50
7
75
100
12
25
Ambient Teemperature TA [℃]
0
5
10
15
5
20
25
30
35
40
0
Supply V
Voltage VCC [V
V]
KS
SD-I7F021
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SN34063x
Typical Application Circuit
Step Up Converter
Fig.7 Step Up Converter
Test Condition
Test
Condition
Value (Typ)
Unit
Line Regulation
VIN=8.0V to 16V, IO=175mA
30
mV
Load Regulation
VIN=12V, IO=75mA~175mA
10
mV
Output Ripple
VIN=12V, IO=175mA
300
mV
Efficiency
VIN=12V, IO=175mA
89
%
Fig.8 External Current Boost Connections for IC Peak Greater than
8-b. External NPN Saturated
8-a. External NPN
KSD-I7F021
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SN34063x
Typical Application Circuit
Step Down Converter
Fig.9 Step Down Converter
Test Condition
Test
Condition
Value (Typ)
Unit
Line Regulation
VIN=15V to 25V, IO=500mA
5
mV
Load Regulation
VIN=25V, IO=50mA~500mA
30
mV
Output Ripple
VIN=25V, IO=500mA
100
mV
Efficiency
VIN=25V, IO=500mA
80
%
VIN=25V, RLOAD=0.1Ω
1.2
A
Short Circuit Current
Fig.10 External Current Boost Connections for IC Peak Greater than
10-a. External NPN
10-b. External NPN Saturated
KSD-I7F021
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SN34063x
Typical Application Circuit
Voltage Inverting Converter
Fig.11 Voltage Inverting Converter
Test Condition
Test
Condition
Value (Typ)
Unit
Line Regulation
VIN=4.5V to 6.0V, IO=100mA
15
mV
Load Regulation
VIN=5.0V, IO=10mA~100mA
20
mV
Output Ripple
VIN=5.0V, IO=100mA
280
mV
Efficiency
VIN=5.0V, IO=100mA
58
%
VIN=5.0V, RLOAD=0.1Ω
0.9
A
Short Circuit Current
Fig.12 External Current Boost Connections for IC Peak Greater than
12-a. External NPN
12-b. External NPN Saturated
KSD-I7F021
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SN34063x
Calculation
Calculation
Step-Up
Step-Down
Voltage-Inverting
VOUT + VF - VIN (min)
VIN (min) - Vsat
VOUT + VF
VIN (min) - Vsat - VOUT
VOUT + VF
VIN - Vsat
1/ f
t ON + t OFF
t ON
+1
t OFF
1/ f
t ON + t OFF
t ON
+1
t OFF
1/ f
t ON + t OFF
t ON
+1
t OFF
tON
( t ON + t OFF ) - t OFF
( t ON + t OFF ) - t OFF
( t ON + t OFF ) - t OFF
CT
4.0 × 10-5 t ON
t
2I OUT (max) ( ON + 1)
t OFF
4.0 × 10-5 t ON
4.0 × 10-5 t ON
t
2I OUT (max) ( ON + 1)
t OFF
0.3 / I PK (switch )
0.3 / I PK (switch )
tON/tOFF
(tON + tOFF)
tOFF
IPK(switch)
RSC
L(min)
(
VIN (min) - Vsat
I PK ( switch )
CO
9
2I OUT (max)
) × t ON (max)
(
VIN (min) - Vsat - VOUT
I PK ( switch )
) × t ON (max)
I PK ( switch ) ( t ON + t OFF )
IOUT t ON
Vripple( pp )
8Vripple( pp )
0.3 / I PK (switch )
(
VIN (min) - Vsat
I PK ( switch )
9
) × t ON (max)
IOUT t ON
Vripple( pp )
Note
Vsat = Saturation voltage of the output switch.
VF = Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
VIN − Nominal input voltage.
VOUT − Desired output voltage,
VOUT = 1.25 × (1 + R 2 / R1)
IOUT − Desired output current.
fmin − Minimum desired output switching frequency at the selected values of Vin and IO.
Vripple(pp) − Desired peak−to−peak output ripple voltage. In practice, the calculated capacitor value will need to be
increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value
since it will directly affect the line and load regulation.
KSD-I7F021
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SN34063x
Outline Dimension (Unit : mm) [SOP-8]
※ Recommend PCB solder land (Unit : mm)
KSD-I7F021
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SN34063x
Outline Dimension (Unit : mm) [DIP-8]
KSD-I7F021
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SN34063x
The AUK Corp. products are intended for the use as components in general electronic
equipment (Office and communication equipment, measuring equipment, home
appliance, etc.).
Please make sure that you consult with us before you use these AUK Corp. products
in equipments which require high quality and / or reliability, and in equipments which
could have major impact to the welfare of human life(atomic energy control, airplane,
spaceship, transportation, combustion control, all types of safety device, etc.). AUK
Corp. cannot accept liability to any damage which may occur in case these AUK Corp.
products were used in the mentioned equipments without prior consultation with AUK
Corp..
Specifications mentioned in this publication are subject to change without notice.
KSD-I7F021
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