Description：

The UCC280x series of high-speed, low-power integrated circuits contain all the control and drive components required for offline and DC/DC fixed-frequency current-mode switching power supplies, with a minimal number of external components. These devices use the same pin configuration as the UCx84x series and also offer additional features such as internal full-cycle soft start and internal leading-edge blanking of the current-sense input. The UCC280x series provides multiple package options, temperature ranges, maximum duty cycles, and undervoltage lockout threshold levels. Devices such as the UCC2803 and UCC2805, which have lower reference voltages, are particularly suitable for battery-powered systems, while the UCC2802 and UCC2804, with higher reference voltages and wider UVLO hysteresis, are ideal for offline power supply applications. The UCC280x series devices are rated for operation over the temperature range of –40°C to 125°C.

Features：

• 100μA typical startup supply current

• 500μA typical operating supply current

• Operating frequency up to 1MHz

• Internal soft start

• Internal fault soft start

• Internal leading-edge blanking of the current-sense signal

• 1A totem-pole output

• 70ns typical response time from current sense to gate-drive output

• 1.5% tolerance voltage reference

• Pin-to-pin compatible with UC3842 and UC3842A

Applications：

• Switch-mode power supplies (SMPS)

• DC/DC converters

• Power modules

• Automotive PSUs

• Battery-powered PSUs