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SG3524N

Part # SG3524N
Description Voltage Mode PWM Controller 18V 100mA 16-Pin PDIP Tube (Al
Category IC
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

Philips Semiconductors Product specification
SG3524SMPS control circuit
1
1994 Aug 31 853-0891 13721
DESCRIPTION
This monolithic integrated circuit contains all the control circuitry for
a regulating power supply inverter or switching regulator. Included in
a 16-pin dual-in-line package is the voltage reference, error
amplifier, oscillator, pulse-width modulator, pulse steering flip-flop,
dual alternating output switches and current-limiting and shut-down
circuitry. This device can be used for switching regulators of either
polarity, transformer-coupled DC-to-DC converters, transformerless
voltage doublers and polarity converters, as well as other power
control applications. The SG3524 is designed for commercial
applications of 0°C to +70°C.
FEATURES
Complete PWM power control circuitry
Single ended or push-pull outputs
Line and load regulation of 0.2%
1% maximum temperature variation
Total supply current is less than 10mA
Operation beyond 100kHz
PIN CONFIGURATION
D, F, N Packages
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
TOP VIEW
INVERT INPUT
NON-INV INPUT
OSC OUTPUT
(+)CL SENSE
(–)CL SENSE
GROUND
R
T
C
T
V
REF
V
IN
EMITTER B
COLLECTOR B
COLLECTOR A
EMITTER A
SHUTDOWN
COMPENSATION
SL00174
Figure 1. Pin Configuration
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
16-Pin Plastic Dual In-Line Package (DIP) 0 to +70°C SG3524N SOT38-4
16-Pin Ceramic Dual In-Line Package (CERDIP) 0 to +70°C SG3524F 0582B
16-Pin Small Outline (SO) Package 0 to +70°C SG3524D SOT109-1
BLOCK DIAGRAM
(SUBSTRATE)
V
IN
15
6
7
1
2
8
10
9
5
4
3
16
12
11
13
14
+
CL
REF
REG
OSC
ERROR
AMPINV INPUT
N.I. INPUT
+5V
OSCILLATOR
OUTPUT
FLIP FLOP
+5V TO ALL
INTERNAL CIRCUITRY
NOR
+
+
NOR
+5V
+5V
SHUTDOWN
GROUND
(RAMP)
1k COMPENSATION
COMPARATOR
+SENSE
–SENSE
C
T
R
T
C
A
E
B
C
B
10k
+5V
V
REF
+5V
SL00175
Figure 2. Block Diagram
Philips Semiconductors Product specification
SG3524SMPS control circuit
1994 Aug 31
2
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNIT
V
IN
Input voltage 40 V
I
OUT
Output current (each output) 100 mA
I
REF
Reference output current 50 mA
Oscillator charging current 5 mA
P
D
Power dissipation
Package limitation 1000 mW
Derate above 25°C 8 mW/°C
T
A
Operating temperature range 0 to +70 °C
T
STG
Storage temperature range -65 to +150 °C
DC ELECTRICAL CHARACTERISTICS
T
A
=0°C to +70°C, V
IN
=20V, and f=20kHz, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
Min Typ Max
UNIT
Reference section
V
OUT
Output voltage 4.6 5.0 5.4 V
Line regulation V
IN
=8 to 40V 10 30 mV
Load regulation I
L
=0 to 20mA 20 50 mV
Ripple rejection f=120Hz, T
A
=25°C 66 dB
I
SC
Short circuit current limit V
REF
=0, T
A
=25°C 100 mA
Temperature stability Over operating temperature range 0.3 1 %
Long-term stability T
A
=25°C 20 mV/kHz
Oscillator section
f
MAX
Maximum frequency C
T
=0.001 µF, R
T
=2k 300 kHz
Initial accuracy R
T
and C
T
constant 5 %
Voltage stability V
IN
=8 to 40V, T
A
=25°C 1 %
Temperature stability Over operating temperature range 2 %
Output amplitude Pin 3, T
A
=25°C 3.5 V
P
Output pulse width C
T
=0.01 µF, T
A
=25°C 0.5 µs
Error amplifier section
V
OS
Input offset voltage V
CM
=2.5V 2 10 mV
I
BIAS
Input bias current V
CM
=2.5V 2 10 µA
Open-loop voltage gain 68 80 dB
V
CM
Common-mode voltage T
A
=25°C 1.8 3.4 V
CMRR Common-mode rejection ratio T
A
=25°C 70 dB
BW Small-signal bandwidth A
V
=0dB, T
A
=25°C 3 MHz
V
OUT
Output voltage T
A
=25°C 0.5 3.8 V
Comparator section
Duty cycle % each output “ON” 0 45 %
Input threshold Zero duty cycle 1 V
Input threshold Maximum duty cycle 3.5 V
I
BIAS
Input bias current 1 µA
Current limiting section
Sense voltage Pin 9=2V with error amplifier set for maximum out,
T
A
=25°C
180 200 220 mV
Sense voltage T.C. 0.2 mV/°C
V
CM
Common-mode voltage -1 +1 V
Philips Semiconductors Product specification
SG3524SMPS control circuit
1994 Aug 31
3
DC ELECTRICAL CHARACTERISTICS (Continued)
T
A
= 0°C to +70°C, V
IN
= 20V, and f = 20kHz, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
Min Typ Max
UNIT
Output section (each output)
Collector-emitter voltage (breakdown) 40 V
Collector-leakage current V
CE
=40V 0.1 50 µA
Saturation voltage I
C
=50mA 1 2 V
Emitter output voltage V
IN
=20V 17 18 V
t
R
Rise time R
C
=2k, T
A
=25°C 0.2 µs
t
F
Fall time R
C
=2k, T
A
=25°C 0.1 µs
Total standby current
(excluding oscillator charging current,
error and current limit dividers, and
with outputs open)
V
IN
=40V 8 10 mA
THEORY OF OPERATION
Voltage Reference
An internal series regulator provides a nominal 5V output which is
used both to generate a reference voltage and is the regulated
source for all the internal timing and controlling circuitry. This
regulator may be bypassed for operation from a fixed 5V supply by
connecting Pins 15 and 16 together to the input voltage. In this
configuration, the maximum input voltage is 6.0V.
This reference regulator may be used as a 5V source for other
circuitry. It will provide up to 50mA of current itself and can easily be
expanded to higher currents with an external PNP as shown in
Figure 3.
I
L
to 1.0A
DEPENDING
ON CHOICE
FOR Q1
V
REF
Q1
100
+V
IN
10
µ
F
+
GND
15 16
8
SG3524
REFERENCE
SECTION
SL00176
Figure 3. Expanded Reference Current Capability
TEST CIRCUIT
OSC OUT
2k
1W
2k
1W
OUTPUTS
12
13
11
14
5410912768
16
3
15
SG3524
RAMP
N.I.
INPUT
INV.
INPUT
COMP
SHUT
DOWN
CURRENT
LIMIT
V
IN
8–40V
0.1
R
T
C
T
2k
10k
2k
10k
1k
V
REF
I
S
V
IN
SL00177
Figure 4. Test Circuit
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