OB2001ZCPA datasheet, PDF - EEWORLD Datasheet

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OB2001ZCPA: CategoryPower/power management Switching power supply chip; File Size716KB，10 Pages; ManufacturerOB(On-Bright); Websitehttp://www.on-bright.com/cn/index.htm; Angbao Electronics (Shanghai) Co., Ltd. is located in Zhangjiang Hi-Tech Park, Pudong, Shanghai, a national information technology industry base in China. It is an enterprise engaged in the design of high-performance analog and mixed-analog integrated circuits. The company focuses on the design, development, testing and sales of analog and mixed-analog integrated circuit products based on advanced submicron CMOS, BIPOLAR, BICMOS, BCD and other process technologies, with communications, consumer electronics, computers and computer interface devices as market targets, and is committed to becoming a world-class analog and mixed integrated circuit design company.

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High Performance synchronous rectifier

OB2001x

GENERAL DESCRIPTION

OB2001x is a high performance and tightly

integrated secondary side synchronous rectifier for

switch mode power supply system. It combines a

much lower voltage drop N-channel MOSFET to

emulate the traditional diode rectifier at the

secondary side of Flyback converter, which can

reduce heat dissipation, increases output current

capability and efficiency and simplify thermal

design. OB2001x can support low system output

voltage down to 2V at constant current mode.

It is suitable for multiple mode applications

including discontinuous conduction mode and

quasi-resonant mode. With its versatility and

optimization, OB2001x can be used in various

switch mode power supply topologies including

secondary-side control topology and primary-side

control topology.

From the information on the secondary side of the

isolation transformer, OB2001x generates a

driving signal with dead time with respect to the

primary side PWM signal to turn the integrated N-

channel SR switch on and off in proximity of the

zero current transition. It is optimized for 5V output

voltage.

The externally adjustable minimum on time and

property off time control scheme effectively avoid

the ring impact induced by parasitic elements so

that a reliable and noise free operation of the SR

system is insured.

OB2001x is offered in SOP8 package.

FEATURES

■

APPLICATIONS

■

TYPICAL APPLICATION

©On-Bright Electronics

Confidential

Datasheet

OB_DOC_DS_2001xA3

tia

AC/DC 5V adaptors

Cell phone charger

5V Bias supply

Low voltage rectification circuits

吉

Secondary-side

synchronous

rectifier

optimized for 5V output system

Suitable for DCM, QR operation

Accurate secondary side MOSFET Vds

sensing

Low cost small size CC/CV mode support

Up to 200kHz operation frequency

Output voltage overshoot control

VDD UVLO protection

密

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