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GB98A

Intelligent Lighting Family Product Guide

O2Micro International 

OZ531

FEATURES

• Current mode PWM Controller

• Built-in high voltage (500V) start-up circuit

• Low standby power meets Energy Star® specification

• Current mode control with frequency fold back under light-load condition

• Built-in synchronized slope compensation

• Drive current up to 500mA

• Leading-edge blanking at current sense

• Protection features:

- Under-voltage lockout

- Clamped gate output voltage at 18V

- VDD over-voltage

- Cycle-by-cycle current limiting

- Output over-current; short circuit; and thermal protection

GENERAL DESCRIPTION

The OZ531 is a highly integrated current mode Pulse Width Modulation (PWM)

controller that is ideal for offline AC/DC flyback converter applications.

The controller operates at a fixed frequency of 67kHz. With a built-in high

voltage start-up circuit, OZ531 eliminates the power loss caused by start-up

resistors. The driver outputs a soft-drive signal which reduces electromagnetic

interference in the converter system.

APPLICATIONS

• Battery Charger

• AC/DC Power Adapter

APPLICATION DIAGRAM

Patents pending.

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