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OB2578T - High Performance CCM/QR Mode Primary-Side Power Switch

Download the OB2578T datasheet PDF. This datasheet also covers the OB2578T-On variant, as both devices belong to the same high performance ccm/qr mode primary-side power switch family and are provided as variant models within a single manufacturer datasheet.

General Description

OB2578T is an excellent primary side regulation power switch with CC/CV operation for medium level power AC/DC charger and adapter applications.

The device operates in CCM/QR mode to provide high efficiency along with several functions of built-in protections.

Key Features

  • Primary-side sensing and regulation operates in CCM/QR mode without TL431 and opto-coupler.
  • High precision constant voltage and current regulation at universal AC input.
  • Fixed frequency (65kHz) CCM mode operation with low line voltage at full load.
  • Integrated 4A MOSFET.
  • Quasi-resonant operation for high efficiency in high line voltage.
  • Programmable CV and CC regulation.
  • Good dynamic response.
  • Built-in line compensation for tight CC regulation.
  • Built-.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (OB2578T-On-BrightElectronics.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number OB2578T
Manufacturer On-Bright
File Size 1.00 MB
Description High Performance CCM/QR Mode Primary-Side Power Switch
Datasheet download datasheet OB2578T 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
OB2578T High Performance CCM/QR Mode Primary-Side Power Switch GENERAL DESCRIPTION OB2578T is an excellent primary side regulation power switch with CC/CV operation for medium level power AC/DC charger and adapter applications. The device operates in CCM/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 line voltage and load condition. At full loading, the controller operates in fixed frequency CCM in low line voltage and quasi-resonant (QR) mode in high line voltage.