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OB2571 - High Performance QR mode Primary-Side Power Switch

Download the OB2571 datasheet PDF. This datasheet also covers the OB2571-On variant, as both devices belong to the same high performance qr mode primary-side power switch family and are provided as variant models within a single manufacturer datasheet.

General Description

OB2571x is an excellent primary side regulation controller with CC/CV operation for medium level power AC/DC charger and adapter applications.

The device integrates an internal power MOSFET and operates in QR mode to provide high efficiency along with several functions of built-in protections.

Key Features

  • Primary-side sensing and regulation operates in QR mode without TL431 and opto-coupler.
  • High precision constant voltage and current regulation at universal AC input.
  • Programmable CV and CC regulation.
  • Integrated power MOSFET.
  • Good dynamic response.
  • Programmable Brownout Protection and Line OVP Protection(For 2571Lx only).
  • Built-in line compensation for tight CC regulation.
  • Built-in fixed cable compensation.
  • Built-in primary winding inductance compens.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (OB2571-On-BrightElectronics.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number OB2571
Manufacturer On-Bright
File Size 873.78 KB
Description High Performance QR mode Primary-Side Power Switch
Datasheet download datasheet OB2571 Datasheet

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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
OB2571x High Performance QR mode Primary-Side Power Switch GENERAL DESCRIPTION OB2571x is an excellent primary side regulation controller with CC/CV operation for medium level power AC/DC charger and adapter applications. The device integrates an internal power MOSFET and operates in QR mode to provide high efficiency along with several functions of built-in protections. It removes the need for secondary feedback circuitry to lower the total bill of material cost. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. In CV control, the controller changes the mode of operation according to load condition. At full loading, the controller operates in quasi-resonant (QR) mode in the universal line voltage.