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OB2211 - Primary-Side Regulation PWM Power Switch

Download the OB2211 datasheet PDF. This datasheet also covers the OB2211-On variant, as both devices belong to the same primary-side regulation pwm power switch family and are provided as variant models within a single manufacturer datasheet.

General Description

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.

Key Features

  • including Cycle-by-Cycle current limiting, VDD over-voltage clamp and UVLO, fail-safe protection for open loop fault condition. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output with No-Y cap design.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (OB2211-On-Bright.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number OB2211
Manufacturer On-Bright
File Size 330.00 KB
Description Primary-Side Regulation PWM Power Switch
Datasheet download datasheet OB2211 Datasheet

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
OB2211/OB2212 Primary-Side Regulation PWM Power Switch GENERAL DESCRIPTION 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.