Transcription of UCx84x Current-Mode PWM Controllers
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UCx84x Current-Mode PWM Controllers
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 Current-Mode control schemes, with a minimum number of external components.
The PWM uses this signal to terminate the OUTPUT switch conduction. A voltage ramp can be applied to this pin to run the device with a voltage-mode control configuration. NC — 2, 4, 6, 13 1, 3, 4, 6, 8, 9, 11, 14, 16, 19 — Do not connect OUTPUT 6 10 15 O OUTPUT is the gate drive for the external MOSFET. OUTPUT is the
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