BP3102 datasheet(7/10 Pages) BPS

7 / 10 page

BP3102

High Precision PSR Constant Current LED Driver

BP3102_DS_Rev.1.0

www.bpsemi.com

Bright Power Semiconductor Co. Confidential – Customer Use Only

Internal Block Diagram

Figure 3. BP3102 Internal Block Diagram

Function Description

The BP3102 is a high performance power switch

specially designed for LED lighting, it uses the

patent constant current control technology of BPS.

The BP3102 integrates a 600V power MOSFET. The

accurate LED current can be realized without

opto-coupler and TL431 feedback circuit while

minimizing the external component count, lowering

the total bill of material cost.

Start Up

The start-up current in BP3102 is designed to as low

as 25uA. The VCC capacitor will be charged through

the start-up resistor when the system is powered on,

once the voltage on VCC reaches the start-up

threshold, the BP3102 will start to operate, and then

the VCC is supplied by the auxiliary winding.

Constant Current Control

Cycle-by-Cycle current sense is offered in BP3102,

the CS is connected to the current sense comparator,

and the voltage on CS will be compared with the

internal 500mV reference voltage, the MOSFET will

be switched off when the voltage on CS reaches the

threshold. The output of the comparator also includes

a 500nS leading edge blanking time

The primary peak current is given by:

)

(

500

P_PK

The current in LED can be calculated by the

equation:

BP3102 데이터시트(PDF) 7 Page - Bright Power Semiconductor Co., Ltd.