On-Bright OB3639B
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 components and the opto-coupler.| Part No. | OB3639B |
|---|---|
| Datasheet | OB3639B Download |
| Manufacturer |  On-Bright |
| Description | Low THD Offline LED Lighting Controller |
| Buy | Stock & Price |
GENERAL DESCRIPTION
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 compensated for tolerance of transformer inductance variation. And the line compensation and load compensation are built in OB3639B for high precisely constant output current control. OB3639B offers comprehensive protection coverage with auto-recovery features including programmable line voltage foldback , programmable line voltage OVP, NTC thermistor thermal foldback, LED open loop protection, LED short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), etc. OB3639B is offered in SOP-8 package.FEATURES
● Fast start up● High PF (>0.9)
● Low THD (<10%)
● Programmable line voltage foldback
● Programmable line volta...
