Transcription of UCx84x Current-Mode PWM Controllers - Texas Instruments
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UCx84x Current-Mode PWM Controllers - Texas Instruments
UCx84x Current-Mode PWM Controllers1 Features Optimized for off-line and DC-to-DC converters Low start-up current (< 1 mA) Automatic feedforward compensation Pulse-by-pulse current limiting Enhanced load-response characteristics Undervoltage lockout with hysteresis Double-pulse suppression High-current totem-pole output Internally trimmed bandgap reference Up to 500-kHz operation Error amplifier with low output resistance2 Applications Switching regulators of any polarity Transformer-coupled DC-DC converters3 DescriptionThe UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency
do not have this pin, the gate driver is biased from the VCC pin. VC must have a bypass capacitor at least 10 times greater than the gate capacitance of the main switching FET used in the design. VCC 7 12 18 I Analog controller bias input that provides power to the device. Total VCC current is the sum of the quiescent VCC current and the
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