Overview
BP2857D is a high-precision step-down LED constant current driver chip.
The chip operates in the inductor current critical continuous mode, suitable for use 85Vac ~ 265Vac full range of input voltage non-isolated step-down type LED constant current power supply.
BP2857D chip integrated 500V power switch, the use of patents The floats are driven by the architecture and the current sensing mode, the chip is working on electricity Very low flow, no auxiliary winding detection and power supply, only need very little Of the external components, you can achieve excellent constant current characteristics, great Saving system cost and volume.
BP2857D chip with a high precision current sampling circuit, at the same time Using a patented constant current control technology to achieve high-precision LED Constant current output and excellent line voltage regulation. The chip is working on electricity Sense current critical mode, the output current does not follow the inductance and LED work Change the voltage changes, to achieve excellent load regulation.
The BP2857D has multiple protection features, including LED open / short circuit Protection, CS resistance short circuit protection, undervoltage protection, chip temperature too Heat regulation and so on.
The BP2857D is available in DIP-7 packages.

FEATUREs
■ Inductance current critical continuous mode
■ Internal integrated 500V power tube
■ No auxiliary winding detection and power supply required
■ chip ultra low operating current
■ Wide input voltage
■ ± 5% LED output current accuracy
■ LED open circuit protection
■ LED short circuit protection
■ CS resistance short circuit protection
■ chip power supply undervoltage protection
■ Overheat adjustment function
■ In DIP-7 package

APPLICATION
■ LED fluorescent lamp
■ LED ceiling light
■ LED bulb light
■ other LED lighting