![]() ![]() ![]() The UC184x devices are specified for operation from –55☌ to 125☌, the UC284x series is specified for operation from –40☌ to 85☌, and the UC384x series is specified for operation from 0☌ to 70☌. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state. ![]() Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. The 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. Error amplifier with low output resistance.Optimized for off-line and DC-to-DC converters. ![]()
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