UCC2803

低功耗 BiCMOS 电流模式 PWM

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

These devices have the same pin configuration as the UCx84x family, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-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 and UCC2805 fit best into battery-operated systems, while the higher reference and higher UVLO hysteresis of the UCC2802 and UCC2804 make these ideal choices for use in off-line power supplies.

The UCC180x series is specified for operation from –55°C to 125°C, the UCC280x series is specified for operation from –40°C to 85°C, and the UCC380x series is specified for operation from 0°C to 70°C.

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100-µA Typical Starting Supply Current

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500-µA Typical Operating Supply Current

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Operation up to 1 MHz

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Internal Soft Start

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Internal Fault Soft Start

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Internal Leading-Edge Blanking of the Current

Sense Signal

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1-A Totem-Pole Output

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70-ns Typical Response from Current-Sense

to Gate Drive Output

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1.5% Tolerance Voltage Reference

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Same Pinout as UC3842 and UC3842A