PWM Controller

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Overview

The SG3525A PWM Controller offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. A sync input to the oscillator enables multiple units to be slaved or a single unit to be synchronized to an external system clock. A wide range of deadtime can be programmed by a single resistor connected between the CT and Discharge pins. This device also features built-in soft-start circuitry, requiring only an external timing capacitor. A shutdown pin controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands. The under voltage lockout inhibits the outputs and the changing of the soft-start capacitor when VCC is below nominal. The output stages are totem-pole design capable of sinking and sourcing in excess of 200 mA. The output stage of the SG3525A features NOR logic resulting in a low output for an off-state.

  • Half Bridge
  • Push-Pull
  • 8.0 V to 35 V Operation
  • 5.1 V +/- 1.0% Trimmed Reference
  • 100 Hz to 400 kHz Oscillator Range
  • Separate Oscillator Sync Pin
  • Adjustable Deadtime Control
  • Input Undervoltage Lockout
  • Latching PWM to Prevent Multiple Pulses
  • Pulse-by-Pulse Shutdown
  • Dual Source/Sink Outputs: +/- 400 mA Peak
  • Pb-Free Packages are Available*

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ECAD Models

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SG3525ANG

Active

Pb

A

H

P

PDIP-16

NA

0

TUBE

25

Y

Step-Up

1

Voltage Mode

8

35

400

$0.5236

More Details

SG3525ADWG

Obsolete

Pb

A

H

P

SOIC-16W

3

260

TUBE

47

N

Step-Up

1

Voltage Mode

8

35

400

Price N/A

More Details

SG3525ADWR2G

Active

Pb

A

H

P

SOIC-16W

3

260

REEL

1000

Y

Step-Up

1

Voltage Mode

8

35

400

$0.5683

More Details

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