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SG2524 Regulating Pulse-Width Modulator

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The SG2524 is a fixed frequency PWM Modulator IC. This IC is specially designed for switching regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers, and polarity-converter applications.

 

Pin Description SG2524 IC

Pin Number

Pin Name

Description

1

IN-

Negative error amplifier input

2

IN+

Positive error amplifier input

3

OSC OUT

Oscillator Output

4

CURR LIM+

Positive current limiting amplifier input

5

CURR LIM-

Negative current limiting amplifier input

6

RT

Resistor terminal used to set the oscillator frequency

7

CT

Capacitor terminal used to set the oscillator frequency

8

GND

Ground Pin

9

COMP

Error amplifier compensation pin

10

SHUTDOWN

Device shutdown Pin

11

EMIT 1

Emitter terminal of BJT output 1

12

COL 1

Collector terminal of BJT output 1

13

COL 2

Collector terminal of BJT output 2

14

EMIT 2

Emitter terminal of BJT output 2

15

VCC

Positive supply Pin

16

REF OUT

Reference regulator output Pin

 

SG2524 Specifications

  • Operating Supply Voltage: 8 V to 40 V
  • Output Voltage: 5 V
  • Output Current: 50 mA
  • Switching Frequency: 0.13 kHz to 722 kHz
  • Duty Cycle - Max: 45 %
  • Operating Temperature Range: - 25 C to + 85 C
  • Rise Time: 200 ns
  • Fall Time: 100 ns
  • Number of Outputs:2 Output

 

Note: Complete Technical Details can be found in the SG2524 datasheet given at the end of this page.

 

Equivalent/Substitute for SG2524: SG3524

Alternatives PWM controller IC:  UC2842, UC3844, UC3842

 

Where to use the SG2524 PWM Controller IC

SG2524 is a Regulating Pulse-Width Modulator IC that incorporates all the functions required in the construction of a regulating power supply, inverter, or switching regulator on a single chip. SG2524 includes 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.

 

The SG2524 can be used in applications like switching regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers, and polarity-converter applications. They also can be used as the control element for high-power-output applications. So if you are looking for an IC to produce PWM signals for controlling a power switch based on the current flowing through the circuit, then this IC might be the right choice for you.

 

How to use SG2524 IC

Although the IC performs a sophisticated job, using it in a circuit is fairly simple and can be done with a minimum number of external components that make this IC a preferable choice among designers. A sample test circuit of this IC datasheet is shown below

SG2524 Application Circuit

This IC has a wide operating voltage between 8V to 40V. The regulator operates at a fixed frequency that is programmed by a one-timing resistor, RT, and one timing capacitor, CT. This IC also has an internal 5V voltage regulator that provides power supply to the SG2524 internal regulator control circuitry. The internal reference voltage is divided externally by a resistor ladder network and the output is sensed by a second resistor divider network.

 

Applications of SG2524

  • SMPS (Switch Mode Power Supplies) circuits
  • DC-DC converter circuits
  • Electronics power supply
  • Battery drain circuit
  • Load machines

 

2D-Model of SG2524 IC

Dimensions for SG2524 IC is given below. These dimensions are for a 16-Pin PDSO package. If you are using a different package IC, please refer to the SG2524 datasheet.

SG2524 Dimensions

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