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    SA3845
    CURRENT MODE PWM CONTROLLER


    The SA3845 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


    Ordering Information
    Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
    SA3845SA SOP-8-225-1.27 SA3845 Halogen free Tube
    SA3845SATR SOP-8-225-1.27 SA3845 Halogen free Tape&Reel
    Block Diagram


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