POWER SYSTEM AND SHORT-CIRCUIT PROTECTION CIRCUIT THEREOF

摘要

A short-circuit protection circuit adapted to a voltage regulator module is provided. The voltage regulator module includes a high side transistor and a low side transistor. The short-circuit protection circuit includes a short-circuit detecting circuit, a first switch, and a second switch. The short-circuit detecting circuit includes a detecting terminal coupled with the high side transistor. The high side transistor is connected with the low side transistor and a load, and the low side transistor is coupled with a ground. The first switch is connected with the low side transistor in parallel. The second switch coupled between the high side transistor and the power supply. The first switch is turned on before the power supply is powered on, the short-circuit detecting circuit sends a detecting voltage to the high side transistor via the detecting terminal to determine whether the high side transistor is short-circuited to control to second switch.

主权项

1. A short-circuit protection circuit adapted to a voltage regulator module that regulates a power input from a power supply and supply power to a load, the voltage regulator module includes a high side transistor and a low side transistor, the short-circuit protection circuit comprising:
a short-circuit detecting circuit including a detecting terminal coupled with an end of the high side transistor, and another end of the high side transistor is connected with an end of the low side transistor and coupled with the load, and another end of the low side transistor is coupled with a ground; a first switch connected with the low side transistor in parallel; and a second switch coupled between the high side transistor and the power supply.