GENERAL DESCRIPTION

OB3626x is highly integrated Buck regulator with advanced features to provide high efficiency control and high precision constant current output for LED lighting applications.

OB3626x features variable fade-in time(gradual on) control.  Through charging an external capacitor connected to FT pin, the fade-in time could be programmed.

The proprietary CC control scheme is used and high precision constant current regulation is realized.

OB3626x offers comprehensive protection coverage with auto-recovery features including LED open loop protection, LED short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), over temperature protection (OTP), thermal foldback etc.

OB3626x is offered in DIP-8 & SOP-7 package.

FEATURES

High precision constant current regulation at universal AC input

Programmable fade-in time

Low system cost and high efficiency

Quasi-Resonant operation

Programmable CC regulation

Thermal foldback function to control LED output current

Insensitive to inductance and line voltage variation

LED short circuit protection

LED open loop protection

Cycle-by-cycle current limiting

Built-in leading edge blanking (LEB)

VDD under voltage lockout with hysteresis

Over temperature protection (OTP)

APPLICATIONS

LED lighting

TYPICAL APPLICATION