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SDH8634
PWM+PFM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET

    SDH8634 is current mode PWM+PFM controller used for SMPS, with built-in high voltage MOSFET, high-voltage startup function, and external sensing resistor.

    SDH8634 has high-voltage startup function to achieve low standby power dissipation (<30mW) and multi-mode control. At heavy load condition, it works  at PWM mode. At light load condition, it works at PFM mode to improve efficiency. At no load condition, it works at burst mode to reduce the standby power dissipation. 

    SDH8634 has switching frequency jitter function to improve EMI performance. 

    SDH8634 integrates complete protections including leading edge blanking (LEB),cycle-by-cycle current limit, VCC overvoltage protection(OVP), output overload protection(OLP)and over-temperature protection(OTP) etc. 

    SDH8634 supports applications up to 18W.


Main feature

  • High-voltage startup

  • Low standby power dissipation

  • Multi-mode control

  • Switching frequency jitter

  • Peak current compensation

  • Soft startup

  • Leading edge blanking(LEB)

  • Cycle-by-cycle current limit

  • VCC overvoltage protection(OVP)

  • Output overload protection(OLP) 

  • Over-temperature protection(OTP)

  • Up to 18W

Ordering Information
Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
SDH8634 DIP-8-300-2.54 SDH8634 Halogen free Tube
Block Diagram

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Documents
title Types of Size (KB) date Download the latest English version
SDH8634 0 1970-01-01 SDH8634 Brief Datasheet