Power supply circuit based on UCC1800 chip

A UCC1800 chip-based power supply circuit provided by the present invention comprises a return difference circuit and an under-voltage protection circuit, the return difference circuit is electrically connected with a reference voltage end of the UCC1800 chip, the return difference circuit is electrically connected with the under-voltage protection circuit, a turn-on voltage input end of the UCC1800 chip-based power supply circuit is electrically connected to the return difference circuit, and a turn-off voltage input end of the UCC1800 chip-based power supply circuit is electrically connected to the under-voltage protection circuit. The power supply voltage input end of the power supply circuit based on the UCC1800 chip is electrically connected to the under-voltage protection circuit; according to the power supply circuit based on the UCC1800 chip, the UCC1800 chip has return difference and under-voltage protection functions, and the problem that when the UCC1800 chip is applied to a product, the UCC1800 ch