• 100-μA Typical Starting Supply Current

• 500-μA Typical Operating Supply Current

• Operation up to 1 MHz

• Internal Soft Start

• Internal Fault Soft Start

• Internal Leading-Edge Blanking of the Current Sense Signal

• 1-A Totem-Pole Output

• 70-ns Typical Response from Current-Sense to Gate Drive Output

• 1.5% Tolerance Voltage Reference

• Same Pinout as UC3842 and UC3842A

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The UCCx80x family of high-speed, low-power integratedcircuits contain all of the control and drive components required for off-line and DC-to-DC fixedfrequency current-mode switching mode power supplies with minimal parts count.

These devices have the same pin configuration as the UCx84x family, and also offer theadded features of internal full-cycle soft start and internal leading-edge blanking of thecurrent-sense input.

The UCCx80x family offers a variety of package options,temperature range options, choice of maximum duty cycle, and choice of critical voltage levels.Lower reference parts such as the UCC2803 and UCC2805 fit best into battery-operated systems, whilethe higher reference and higher UVLO hysteresis of the UCC2802 and UCC2804 make these ideal choicesfor use in off-line power supplies.

The UCC180x series is specified for operation from –55°C to 125°C, the UCC280x series isspecified for operation from –40°C to 85°C, and the UCC380x series is specified for operation from0°C to 70°C.