a driving circuit for a power mosfet includes a first switch , a second switch , a third switch and a fourth switch . the first switch is connected to a first node , a second node and a first power end . the first power end supplies a first voltage . the second switch is connected to the first node , the second node and a first ground end . the third switch is connected to the second node , a third node and the first power end . the fourth switch is connected to the second node , the third node and a second ground end . the power mosfet is connected to the third node and a pwm signal is inputted into the first node . the pwm signal has a second voltage lower than the first voltage .