OB3392K is an offline LED lighting controller with primary side control, high power factor and high constant current (CC) precision, which can achieve low system cost for an isolated lighting application in a single stage converter. It significantly simplifies the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler.


The proprietary CC control scheme is used and the system can achieve high power factor with constant on-time control scheme. Quasi-resonant (QR) operation and clamping frequency greatly improves the system efficiency. The constant output current is compensated for tolerance of transformer inductance variation. And the line compensation and load compensation are built in OB3392K for high precisely constant output current control.


OB3392K 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), etc.


OB3392K is offered in SOT23-6 package.


n High power factor

n High precision constant current regulation at universal AC input

n Primary-side sensing and regulation without TL431 and opto-coupler

n Low system cost and high efficiency

n Quasi-resonant operation

n Programmable CC regulation

n Built-in primary winding inductance compensation

n Built-in line compensation

n Built-in load compensation

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 VDD over voltage protection

n Over temperature protection (OTP)



n LED lighting