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SA3843
CURRENT MODE PWM CONTROLLER

The SA3843 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
SA3843SA SOP-8-225-1.27 SA3843 Halogen free Tube
SA3843SATR SOP-8-225-1.27 SA3843 Halogen free Tape&Reel
Block Diagram

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