UC3844N DATASHEET PDF

This design note describes a circuit with low startup current less than 0. Using an op amp to amplify the current-sense signal can reduce cost and improve noise performance and efficiency. The power stage performs the basic power conversion from the input voltage to the output voltage and includes switches and the output filter. Simplified equations are used to develop obtainable ranges for parameters over IC tolerances. Internally implemented circuits include under-voltage lockout featuring start up current less than 1mA, 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.

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