BP9916B datasheet(5/8 Pages) BPS

5 / 8 page

BP9916B

Non-isolated Buck Offline LED Driver

BP9916B_EN _DS_Rev.1.0

www.bpsemi.com

BPS Confidential – Customer Use Only

晶丰明源半导体

Internal Block Diagram

VCC Supply

VCC UVLO &

Power on Reset

CC &

logic

Control

ZCD

VCC

DRAIN

Current

Sense

LEB

S/H

0.6V

Thermal

Regulation

Figure 3. BP9916B Internal Block Diagram

Application Information

The BP9916B is a high performance non-isolated

Buck converter specially designed for LED lighting.

The device integrates a 500V power MOSFET. With

very

few

external

components,

the

converter

achieves excellent constant current control. And it

does not need auxiliary winding for powering the IC

or voltage sensing, hence the system size and cost is

greatly reduced.

Start Up

After system powered up, the VCC pin capacitor is

charged up by internal HV JEFT. When the VCC pin

voltage reaches the turn on threshold, the internal

circuits start operating. The HV JEFT will still

supply operating current when the IC is working and

keep the VCC voltage at 7.3V.

Constant Current Control

Cycle by Cycle current sense is adopted in BP9916B,

the CS pin is connected to the current sense

comparator, and the voltage on CS pin is compared

with the internal 600mV reference voltage. The

MOSFET will be switched off when the voltage on

CS pin reaches the threshold. The CS comparator

includes a 500ns leading edge blanking time.

The peak inductor current is given by:

BP9916B Datasheet(PDF) 5 Page - Bright Power Semiconductor Co., Ltd.

BP9916B Datasheet(HTML) 5 Page - Bright Power Semiconductor Co., Ltd.

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