OB3639B
DESCRIPTION
OB3639B is an offline LED lighting controller with high power factor, low THD and high constant current (CC) precision. It can achieve low system cost for isolated lighting application by primary side control in a single stage converter. It significantly simplifies the LED lighting system design by eliminating the secondary side feedback ponents and the opto-coupler.
The proprietary CC control is used and the system can achieve high power factor with constant on-time control. Quasi-resonant (QR) operation and clamping frequency greatly improves system efficiency. The advanced start up technology is used to fast start up. The constant output current is pensated for tolerance of transformer inductance variation. And the line pensation and load pensation are built in OB3639B for high precisely constant output current control.
OB3639B offers prehensive protection coverage with auto-recovery features including programmable line voltage foldback , programmable line voltage OVP,...
