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Now over 1,300 items in our Store! Please note: This spec sheet covers several different parts. Optimized For Off-line And DC To DC Converters Automatic Feed Forward Compensation Pulse-by-pulse Current Limiting Enhanced Load Response Characteristics Under-voltage Lockout With Hysteresis High Current Totem Pole Output Internally Trimmed Bandgap Reference The UC1842/3/4/5 family of control ICs 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 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. The output stage, suitable for driving N Channel MOSFETs, is low in the off state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line applications. The corresponding thresholds for the UC1843 and UC1845 are 8.4V and 7.6V. The UC1842 and UC1843 can operate to duty cycles approaching 100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle. for other great component bargains on Microprocessors, Transistors, Capacitors, IC's, Transformers, Diodes, Crystals, and more! And we salute our friends in other countries around the world! (this posting is the responsibility of the poster) |
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