SG3524 Pulse Width Modulator
DMS EL.Com.In
SG3524
Data Sheet
SG3524 Pulse Width Modulator
SG3524 – full-featured PWM controller and incorporate all
functions required in the construction of a regulating power
supply, inverter, or switching regulator on a single chip.
Features
•
•
•
Complete Pulse-Wide Modulation (PWM)
Uncommitted Outputs for Single Ended or Push-Pull
Low Standby Current - 8 mA Typ.
Description
SG3524 – PWM controller, designed for switching regulators of either polarity transformer-
coupled dc-to-dc converters, transformerless voltage doublers, and polarity-converter applications
employing fixed-frequency, pulse-width modulation (PWM) techniques. The complementary output
allows either single-ended or push-pull application. Each device includes an on-chip regulator, error
amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted pass transistors, a high-
gain comparator, and current-limiting and shutdown circuitry.
Typical application
DMS EL.Com.In
SG3524
Data Sheet
Functional Block Diagram
Absolute Maximum Ratings
Symbol
V
CC
I
CC
I
O(ref)
I
CT
Tstg
Definition
Supply voltage
Collector output current
Reference output current
Current through CT terminal
Storage temperature range
Value
40V
100mA
50mA
-5mA
-65 - +150°С
NOTES:
1. Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any
other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
2. All voltage values are with respect to network ground terminal.
DMS EL.Com.In
SG3524
Data Sheet
Recommended Operating Conditions
Parameter
V
CC
Supply voltage
I
O(ref)
Reference output current
I
CT
Current through CT terminal
R
T
Timing resistor
С
T
Timing capacitor
T
A
Ambient temperature
Value
Min
8
0
-0.03
1.8
0.001
0
Max
40
50
-2
100
0.1
70
V
mA
mA
kΩ
uF
°С
Units
Electrical Characteristics
Parameter
Test
conditions
Min.
Тyp.
Max
Reference
V
ref
Output voltage, V
V
RLine
Input regulation, mV
V
RLoad
Output regulation, mV
Ripple rejection
T
С
Output voltage change with temperature, %
I
OS(ref)
Short-circuit output current, %
Oscillator
f
OSC
Oscillator frequency, kHz
σ
OSC
Standard deviation of frequency, %
С
T
= 0.001 µF,
R
T
= 2 kΩ
All values of
voltage,
temperature,
resistance, and
capacitance constant
VCC = 8 V to 40 V
T
A
=0…70°С
С
T
= 0.01 µF
V
IС
= 2.5V
V
IС
= 2.5V
60
1.8…
3.4
0.5
450
5
4.6
VCC = 8 V to 40 V
I
O
= 0 mA to 20 mA
f = 120 Hz
T
A
=0…70°С
Vref = 0
5
10
20
66
0.3
100
5.4
30
50
1
∆f
OSC(V)
Frequency change with voltage, %
∆f
OSC(T)
Frequency change with temperature, %
V
OSC
Output amplitude at OSC OUT, V
t
pw
Output pulse duration (width) at OSC OUT, us
Error Amplifier
V
IO
Input offset voltage, mV
I
IB
Input bias current, uA
A
VOL
Open-loop voltage amplification, dB
VCMR Common-mode input voltage range, V
CMRR Common-mode rejection ratio, dB
G
BW
Unity-gain bandwidth, MHz
V
O
Output swing, V
1
2
3.5
0.5
2
2
80
70
3
3.8
10
10
DMS EL.Com.In
SG3524
Data Sheet
Output
BV
CE
Collector-emitter breakdown voltage, V
I
C(off)
Collector off-state current, uA
V
CES
Collector-emitter saturation voltage, V
V
EO
Emitter output voltage, V
t
r
Turn-off voltage rise time, us
t
f
Turn-on voltage fall time, us
Comparator
t
ON
/ t
OFF
Maximum duty cycle, each output, %
V
ITZ
Input threshold voltage at COMP, V
V
ITМ
Input threshold voltage at COMP, V
I
IB
Input bias current, uA
Current Limiting
V
I
Input voltage range (either input), V
V
SENSE
Sense voltage at T
A
= 25°С
T
SENSE
Temperature coefficient of sense voltage,
mV/°С.
Standby mode
I
ST
Standby current, mA
40
V
CE
= 40 V
I
C
= 50 mA
V
C
= 20 V
I
E
= –250uA
R
С
= 2кΩ
R
С
= 2кΩ
17
0.01
1
18
0.2
0.1
50
2
45
t
ON
/ t
OFF
=0%
t
ON
/ t
OFF
=45%
1
3.5
-1
V
(IN+)
- V
(IN-)
≤
50mV;
V
(COMP)
= 2V
-1…1
175
200
0.2
225
8
10
NOTES:
1. Electrical Characteristics over recommended operating free-air temperature range, V
CC
= 20 V, f =
20 kHz (unless otherwise noted).
2. For conditions shown as MIN or MAX, use the appropriate value specified under recommended
operating conditions.
3. All typical values, except for temperature coefficients, are at T
A
= 25°С.
4. Test conditions for standby mode VCC = 40 V, IN–, CURR LIM+, CT, GND, COMP, EMIT 1,
EMIT 2 grounded, IN+ at 2 V, All other inputs and outputs open.
DMS EL.Com.In
SG3524
Data Sheet
Test circuit
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