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OB2538 - High Precision CC/CV Primary-Side PWM Controller

This page provides the datasheet information for the OB2538, a member of the OB2538-On High Precision CC/CV Primary-Side PWM Controller family.

Datasheet Summary

Description

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.

Features

  • including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. High precision constant voltage (CV) and constant current (CC) can be achieved by OB2538.

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Datasheet preview – OB2538

Datasheet Details

Part number OB2538
Manufacturer On-Bright Electronics
File Size 403.59 KB
Description High Precision CC/CV Primary-Side PWM Controller
Datasheet download datasheet OB2538 Datasheet
Additional preview pages of the OB2538 datasheet.

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Full PDF Text Transcription

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On-Bright Confidential to ACT OB2538 High Precision CC/CV Primary-Side PWM Controller Product Specification GENERAL DESCRIPTION OB2538 is a high performance 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. 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. In addition, good load regulation is achieved by the built-in cable drop compensation.
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