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    SA3842
    CURRENT MODE PWM CONTROLLER

    The SA3842 provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic   to insure latched operation, a PWM comparator which also provides current limit control and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N channel MOSFETs, is low in the off state.


    Main feature


    • Optimized for off-line and DC to DC converts

    • Low start up current(<0.5mA)

    • Automatic feed forward compensation

    • Pulse-by-Pulse current limiting

    • Enhanced load response characteristics

    • Under-voltage lockout with hysteresis

    • Double pulse Suppression

    • High current totem pole output

    • Internally trimmed bandgap reference

    • 500kHz operation


    Block Diagram


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