OB3639B Overview
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.
OB3639B Key Features
- Fast start up
- High PF (>0.9)
- Low THD (<10%)
- Programmable line voltage foldback
- Programmable line voltage OVP
- NTC thermistor thermal foldback
- High precision constant current
- Low system cost and high efficiency
- Quasi-resonant operation
- Programmable CC regulation