GENERAL DESCRIPTION

OB3335Ax is a TRIAC dimmable high power factor, low THD, highly integrated buck-boost/flyback regulator with advanced features to provide high efficiency control and high precision constant current output for dimmable LED lighting applications.

Without external large compensation capacitor, the system can achieve high power factor and low THD with proprietary PFC control scheme.

OB3335Ax 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), thermal foldback etc.

OB3335Ax is offered in SOP-7 package.

FEATURES

Excellent TRIAC dimming performance

Low system cost and high efficiency

Without external power supply circuit

High PF（PF>0.9）@90~132Vac input

Low THD（THD＜10%）@90~132Vac input

NEMA SSL6 Dimming Curve compliant

High precision constant current regulation at universal AC input

Quasi-Resonant operation

Thermal foldback function for LED output current control and Over temperature protection (OTP)

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

APPLICATIONS

Dimmable LED lighting

Typical Application for Buck-Boost Topology