Under-voltage protection circuit for programmable power supplies

摘要

A control circuit of a power supply is provided. The power supply includes a current-sense circuit, a voltage-sense circuit, an output voltage regulation circuit, and a current regulation circuit. The current-sense circuit generates a current-sense signal in response to an output current of the power supply. The voltage-sense circuit generates a voltage-sense signal in response to an output voltage of the power supply. The output voltage regulation circuit is coupled to regulate the output voltage of the power supply according to a voltage reference signal and the voltage-sense signal. The output current regulation circuit is coupled to regulate the output current of the power supply according to a current reference signal and the current-sense signal. The output voltage of said power supply is programmable.

主权项

1. A control circuit of a programmable power supply, comprising:
a current-sense circuit generating a current-sense signal in response to an output current of said programmable power supply; a voltage-sense circuit generating a voltage-sense signal in response to an output voltage of said programmable power supply; an output voltage regulation circuit coupled to regulate said output voltage of said programmable power supply according to a voltage reference signal and said voltage-sense signal; and an output current regulation circuit, coupled to regulate said output current of said programmable power supply according to a current reference signal and said current-sense signal, wherein said current reference signal is changed in response to a level of said output voltage of the programmable power supply, and said output current of said power supply is decreased in response to a decrement of said current reference signal, and wherein said output voltage of said programmable power supply is programmable.