GENERAL DESCRIPTION

OB3615x is a high power factor, highly integrated buck regulator with advanced features to provide high efficiency control and high precision constant current output for LED lighting applications.

The proprietary CC control scheme is used to provide features of insensitivity to inductance and line voltage. Without external large compensation capacitor, the system can achieve high power factor with proprietary PFC control scheme.

OB3615x 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.

OB3615x is offered in SOP-8/DIP8 package.

FEATURES

High PF（PF>0.9）Buck topology with low system cost

High precision constant current regulation at universal AC input

Low system cost and high efficiency

Quasi-Resonant operation

Programmable CC regulation

Thermal foldback function to control LED output current

Insensitivity 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