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UTCUC3843A - CURRENT MODE PWM CONTROL CIRCUITS

General Description

The UTC UC3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count SOP-8

Key Features

  • Low external part count.
  • Low start up current ( Typical 0.12mA ).
  • Automatic feed forward compensation.
  • Pulse-by-Pulse current limiting.
  • Under-voltage lockout with hysteresis.
  • Double pulse Suppression.
  • High current totem pole output to drive MOSFET directly.
  • Internally trimmed band gap reference.
  • 500kHz operation DIP-8 BLOCK.

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UTC UC3842A / 3843A LINEAR INTEGRATED CIRCUIT CURRENT MODE PWM CONTROL CIRCUITS DESCRIPTION The UTC UC3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count SOP-8 FEATURES *Low external part count. *Low start up current ( Typical 0.12mA ) *Automatic feed forward compensation *Pulse-by-Pulse current limiting *Under-voltage lockout with hysteresis *Double pulse Suppression *High current totem pole output to drive MOSFET directly *Internally trimmed band gap reference *500kHz operation DIP-8 BLOCK DIAGRAM 7 Vcc Vref 8 Internal Bias 1/2Vref 5V REF S/R 5 GND Vref Good Logic 1/3Vref U.V.L.