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DESCRIPTION The ZCC6908HV is a Low-Drop Diode Emulator IC that, combined with an external switch, replaces Schottky diodes in high-efficiency Flyback converters. The chip regulates the forward drop of an external Synchronous Rectifier (SR) MOSFET to about 40mV and switches it off as soon as the voltage becomes negative. ZCC6908HV can generate its own supply voltage for battery charging applications with low output voltage or high side rectification applications. A programmable ringing detection circuitry prevents ZCC6908HV false turn-on during DCM and Quasi-Resonant operations. ZCC6908HV is available in space saving TSOT23-6 packages. FEATURES ● Operates in a wide output voltage range down to 0V ● Self-supplying for operation with low output voltage rectification without an auxiliary winding ●· Works with 12V Standard and 5V Logic Level SR MOSFETS ●· Compatible with Energy Star,1W Standby Requirements ●· <30ns Fast Turn-off and Turn-on Delay ●· <100uA Quiescent Current ●· Supports DCM, Quasi-Resonant and CCM Operations ●· Supports both High-side and Low-side Rectification ●· Power Savings of Up to 1.5W in a Typical Notebook Adapter ●· TSOT23-6 Package Available APPLICATIONS ● Industrial Power Systems ● Distributed Power Systems ● Battery Powered Systems ● Flyback Converters |
