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        Secondary Side Synchronous Rectifier (SR) Controller

        General Description

        KP401 is a secondary side synchronous rectifier controller, that replaced Schottky diodes by combined with an ultra low on-state resistance power switch for high-efficiency flyback converters. KP401 supports CCM, DCM and Quasi-Resonant Topologies based on the proprietary of “Self-Suitable Dead Time Control” technology. An integrated Error Amplifier with 1.25V reference voltage can replace TL431 for cost saving.

        KP401 integrates protections of Under Voltage Lockout (UVLO), Primary-Side switching on time Expansion and Shrink Protection.


        l   Secondary Side Synchronous Rectifier(SR) for flyback converters

        l   Supports CCM, DCM and Quasi-Resonant Topologies

        l   <300uA Low Quiescent Current

        l   Built-in 1.25V(±1.5%) Reference Voltage and Error Amplifier for Eliminating TL431

        l   Built-in Protections:

        n  VCC UVLO

        n  Primary-Side switching on time Expansion and Shrink Protection

        l   SOT23-6  packages available


        l   Industrial Power Systems

        l   Battery Powered Systems

        l   Flyback Converters

        Pin Configuration

        Typical Application Circuit

        Ordering Information

        Part Number



        SOT23-6L, Pb free in T&R, 3000Pcs/Reel

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