Part Number : BP9021
Function : High Precision PSR LED Constant Current Driver Chip
Package : SOP 8Pin
Manufacturers : Bright Power Semiconductor ( www.bpsemi.com )
The BP9021 is a high precision primary-side constant current LED driver chips. Chip inductor in discontinuous current mode for full range 85Vac ~ 265Vac input voltage, power 3W or less isolated flyback LED constant current power supply.
The chip integrated 650V power switch, primary-side feedback mode, no secondary feedback circuit, and without compensation circuitry, requires minimal external components to achieve excellent constant current characteristic. Patented drive and current detection method, the chip operating current is extremely low, no power transformer auxiliary winding detection and further reduce external components, greatly saving system cost and size.
1. Integrated 650V power MOSFET
2. PSR constant current control, without secondary feedback circuitry
3. Without detection and power transformer auxiliary winding
4. LED open-circuit voltage can be adjusted by external resistor
5. Chip ultra low operating current