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.


n Excellent TRIAC dimming performance

n Low system cost and high efficiency

n Without external power supply circuit

n High PFPF>0.9@90~132Vac input

n Low THDTHD10%@90~132Vac input

n NEMA SSL6 Dimming Curve compliant

n High precision constant current regulation at universal AC input

n Quasi-Resonant operation

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

n LED short circuit protection

n LED open loop protection

n Cycle-by-cycle current limiting

n Built-in leading edge blanking (LEB)

n VDD under voltage lockout with hysteresis



n Dimmable LED lighting



Typical Application for Buck-Boost Topology


MinOpen Frame