OB2212 PDF Datasheet – Offline PWM Power Switch

Part Number: OB2212

Function: Primary-Side Regulation PWM Power Switch

Package: DIP, SOP 8 Pin Type

Manufacturer: On-Bright


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OB2212 image


The OB2211, OB2212 is an offline PWM Power switch for low power AC/DC charger and adaptor
applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated from design. Proprietary Constant Voltage (CV) and Constant Current (CC)
control is integrated as shown in the figure below.

In CC control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode operations are utilized to achieve high performance and high
efficiency. Device operates in fixed frequency mode at large load conditions, frequency reduction mode at light/medium load and ‘Extended burst mode’ at No/light load conditions.



1. Primary-side Sensing and Regulation With No TL431 and Opto-coupler

2. Multi-mode Operation for High Efficiency

3. Programmable CV and CC Regulation

4. Adjustable Constant Current and Output Power setting



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1. Low Power AC/DC offline SMPS for

2. Cell Phone Charger

3. Digital Cameras Charger

4. Small Power Adaptor

5. Auxiliary Power for PC, TV etc

Other data sheets are available within the file: OB2212AP, OB2212CP, 0B2212

OB2212 Datasheet