OB3636A

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

n High precision constant voltage regulation

n High PF

n Low THD

n Fast start-up

n Low system cost and high efficiency

n Quasi-resonant operation

n Short circuit protection

n Open circuit protection

n Cycle-by-cycle current limiting

n Built-in leading edge blanking (LEB)

n VDD under voltage lockout with hysteresis (UVLO)

n VDD over voltage protection

n Over temperature protection (OTP)

n Over load protection (OLP)

n Audio Noise Free

APPLICATIONS

n LED lighting

FLYBACK TYPICAL APPLICATION

BUCK TYPICAL APPLICATION