OB3332Bx is a TRIAC dimmable high power factor, highly integrated buck/buck-boost regulator with advanced features to provide high efficiency control and high precision constant current output for dimmable 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.
OB3332Bx 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.
OB3332Bx is offered in SOP-8 package.
n Excellent TRIAC dimming performance
n Low system cost and high efficiency
n High PF（PF>0.9）@175~264Vac input
n Support buck/buck-boost topology
n High precision constant current regulation at universal AC input
n Quasi-Resonant operation
n Thermal foldback function for LED output current control
n Insensitivity to inductance and line voltage variation
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 Over temperature protection (OTP)
n Dimmable LED lighting
Figure 1 Buck Application circuit
Figure 2 Buck-Boost Application circuit