OB2578T Datasheet PDF - On-Bright Electronics High Performance CCM/QR Mode Primary-Side Power Switch Specs

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

This page provides the datasheet information for the OB2578T, a member of the OB2578T-On High Performance CCM/QR Mode Primary-Side Power Switch family.

Datasheet Summary

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.

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-.

Datasheet Details

Part number	OB2578T
Manufacturer	On-Bright Electronics
File Size	1.00 MB
Description	High Performance CCM/QR Mode Primary-Side Power Switch
Datasheet	OB2578T Datasheet
Additional preview pages of the OB2578T datasheet.

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Full PDF Text Transcription

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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.

Published: Sep 29, 2024 |