Datasheet > BL8891B

BL8891B

更新时间： 2024-11-15 14:53:55

品牌	Logo	应用领域
上海贝岭 - BELLING		/
页数	文件大小	规格书
7页	267K
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BL8891B 数据手册

BL8891B

Freq Shuffling

Current Mode PWM Power Switch

GENERAL DESCRIPTION

BL8891B combines a dedicated current mode PWM controller with a high voltage power MOSFET. It is

optimized for high performance, low standby power, and cost effective off-line flyback converter

applications.

BL8891B offers complete protection coverage with automatic self-recovery feature including

Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VDD over voltage clamp and under

voltage lockout (UVLO). Excellent EMI performance is achieved with proprietary frequency shuffling

technique together with soft switching control at the totem pole gate drive output.

The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during

operation.

BL8891B is offered in DIP-7 package.

FEATURES

■Power on Soft Start Reducing MOSFET VDS Stress

■Frequency shuffling for EMI

■Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design

■Audio Noise Free Operation

■Fixed 50KHZ Switching Frequency

■Internal Synchronized Slope Compensation

■Low VDD Startup Current and Low Operating Current

■Leading Edge Blanking on Current Sense Input

Good Protection Coverage With Auto Self-Recovery



VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO)

Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output

Power Limiting Over Universal Input Voltage Range

Overload Protection (OLP)



Over voltage Protection (OVP)

■DIP7 package

APPLICATIONS

Offline AC/DC flyback converter for

■Battery Charger

■PDA power supplies

■Digital Cameras and Camcorder Adaptor

■VCR, SVR, STB, DVD&DVCD Player SM

■Set-Top Box Power

■Auxiliary Power Supply for PC and Server

■Open-frame SMPS

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