GENERAL DESCRIPTION

OB3636A is a flyback and buck controller with high power factor, low THD and high constant voltage (CV) precision. It can achieve low system cost for isolated and non-isolated applications.

The proprietary CV control scheme is used and the system can achieve high power factor with constant on-time control scheme. Quasi-resonant (QR) operation and clamping frequency greatly improves the system efficiency. The advanced start-up technology is used to meet the fast start-up time requirement.

OB3636A offers comprehensive protection including open circuit protection, short circuit protection, over load protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), etc.

OB3636A is offered in SOT23-6 package.

FEATURES

High precision constant voltage regulation

High PF

Low THD

Fast start-up

Low system cost and high efficiency

Quasi-resonant operation

Short circuit protection

Open circuit protection

Cycle-by-cycle current limiting

Built-in leading edge blanking (LEB)

VDD under voltage lockout with hysteresis (UVLO)

VDD over voltage protection

Over temperature protection (OTP)

Over load protection (OLP)

Audio Noise Free

APPLICATIONS

LED lighting

FLYBACK TYPICAL APPLICATION

BUCK TYPICAL APPLICATION