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LT1548 - High Precision CC/CV Primary-Side PWM Power Switch

General Description

LT1548 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.

Key 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 LT1548.

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Datasheet Details

Part number LT1548
Manufacturer Longtium Microelectronics
File Size 360.93 KB
Description High Precision CC/CV Primary-Side PWM Power Switch
Datasheet download datasheet LT1548 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.

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LT1548 High Precision CC/CV Primary-Side PWM Power Switch GENERAL DESCRIPTION LT1548 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.