Philips SG3524D, SG3524F, SG3524N, SG3524NB Datasheet

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

TA=0°C to +70°C, VIN=20V, and f=20kHz, unless otherwise specified.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

Min Typ Max

UNIT

Reference section

V

OUT

Output voltage 4.6 5.0 5.4 V
Line regulation VIN=8 to 40V 10 30 mV
Load regulation IL=0 to 20mA 20 50 mV
Ripple rejection f=120Hz, TA=25°C 66 dB

I

SC

Short circuit current limit V

REF

=0, TA=25°C 100 mA
Temperature stability Over operating temperature range 0.3 1 %
Long-term stability TA=25°C 20 mV/kHz

Oscillator section

f

MAX

Maximum frequency CT=0.001 µF, RT=2kΩ 300 kHz
Initial accuracy RT and CT constant 5 %
Voltage stability VIN=8 to 40V, TA=25°C 1 %
Temperature stability Over operating temperature range 2 %
Output amplitude Pin 3, TA=25°C 3.5 V

P

Output pulse width CT=0.01 µF, TA=25°C 0.5 µs

Error amplifier section

V

OS

Input offset voltage VCM=2.5V 2 10 mV

I

BIAS

Input bias current VCM=2.5V 2 10 µA
Open-loop voltage gain 68 80 dB

V

CM

Common-mode voltage TA=25°C 1.8 3.4 V

CMRR Common-mode rejection ratio TA=25°C 70 dB
BW Small-signal bandwidth AV=0dB, TA=25°C 3 MHz
V

OUT

Output voltage TA=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