OB3336 is a high performance AC/DC Buck-boost/flyback controller for dimmable LED luminaires. OB3336 has  imbedded advanced digital processing technology to eliminate visible flicker and has excellent compatibility with leading-edge or trailing-edge TRAIC dimmer.

OB3336 offers fast startup feature, special mode control technology for power factor correction (PFC), zero current detector (ZCD) to ensure transition mode (TM) operation, and accurate current regulation.

OB3336 offers comprehensive protection coverage including LED string open/short protection, VDD under voltage lockout (UVLO), load voltage over voltage protection, cycle-by-cycle current limiting, over temperature protection, driver output clamping for external power MOSFET protection and transformer saturation protection.

OB3336 is offered in SOP8 package.



n Support Non-isolated Single Winding Inductor with Buck-boost topology

n Compatible with flyback topology

n Excellent TRAIC dimmer compatibility

n No bleeder design

n Wide dimming range of 1% to 100%

n Flicker-free dimming

n High precise constant current (±2%)

n Total harmonic distortion <20% and PF>0.9 without dimmer

n Fast start up (<0.5s without dimmer)

n LED string open protection

n LED string short protection

n Transformer saturation protection

n Over Temperature Protection

n SOP8 Package


n TRIAC dimmable LED lighting


TYPICAL APPLICATION                       

OB3336CP Typical Non-isolated Application Schematic


OB3336CP Typical Isolated Application Schematic