Product Summary

The SD6857 is the primary side controlled LED controller with PFC. It adopts PFM technology for providing accurate constant current control with high average efficiency. With the SD6857, opto-couple, secondary feedback control, loop compensation circuit can be eliminated for reducing cost. The SD6857 applications are: (1)LED lamp; (2)Illuminance with AC input.

Parametrics

SD6857 absolute maximum ratings: (1)Supply voltage VDD: －0.3~25 V; (2)Input voltage on pin FB VFB: －20~22 V; (3)Input voltage on other pins VIN: －0.3~ 5.3 V; (4)Input current IIN: －10~10 mA; (5)Operating junction temperature TJ: +160 ℃; (6)Operating temperature Range Tamb: －40~ +125 ℃; (7)Storage temperature Range TSTG: －55~+150 ℃.

Features

SD6857 features: (1)Active power factor correction (APFC); (2)PSR CC/CV; (3)Ultra-low start-up current; (4)Primary side control; (5)Leading edge blanking; (6)Pulse-Frequency Modulation(PFM); (7)VCC overvoltage/undervoltage protection; (8)LED open/short circuit protection; (9)Internal over temperature protection; (10)Cycle by cycle current limiting; (11)Open loop protection; (12)Peak current compensation.

Diagrams

SD6857 pin connection