Description
www.DataSheet4U.com ® UC2842/3/4/5 UC3842/3/4/5 CURRENT MODE PWM CONTROLLER * *.OPTIMIZED FOR OFF-LINE AND DC TO DC CONVERTERS LOW.
Features
* to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal externalparts count. Internallyimplementedcircuits include undervoltagelockout featuring start-up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure lApplications
* The corresponding thresholds for the UC3843 and UC3845 are 8.5 V and 7.9 V. The UC3842 and UC3843 can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844 and UC3845 by the additionof an internal toggle flip flop which blanks the output off every other cloUC3844 Distributors
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