Transcription of .CONVERTERS OPTIMIZED FOR OFF-LINE AND DC …
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.CONVERTERS OPTIMIZED FOR OFF-LINE AND DC …
UC2842/3/4/5UC3842/3/4/5 October 1998 CURRENT MODE PWM FOR OFF-LINE AND DC TO START-UP CURRENT (< 1 mA).AUTOMATIC FEED FORWARD CURRENT LOAD RESPONSE LOCKOUT WITH PULSE CURRENT TOTEM POLE TRIMMED BANDGAP KHz ROERROR AMPDESCRIPTIONThe UC3842/3/4/5family of control ICs provides thenecessary features to implement OFF-LINE or DC toDC fixed frequency current mode control schemeswith a minimal external parts count. Internallyimple-mentedcircuits include undervoltagelockout featur-ing start-up current less than 1 mA, a precision ref-erence trimmed for accuracy at the error amp input,logic to insure latched operation, a PWM compara-torwhich also providescurrent limit control,and a to-tem pole output stage designed to source or sinkhigh peak current. The output stage, suitable fordriving N-Channel MOSFETs, is low in the between members of this family are theunder-voltage lockout thresholds and maximumduty cycle ranges.
uc2842/3/4/5 uc3842/3/4/5 october 1998 currentmode pwm controller. optimized for off-line and dc to dc. converters. lowstart-up current (< …
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