A SWITCHING CIRCUIT AND THE METHOD THEREOF

摘要

A switching circuit having a low side driver providing a three-level low side drive signal keeps a low side power switch slightly on during a dead time between the low side power switch turn off and a high side power switch turn on, thus a current flowing through a body diode is mostly distributed to the slightly on low side power switch instead of the body diode.

主权项

1. A switching circuit, comprising:
a high side power switch having a first terminal coupled to an input voltage of the switching circuit, a second terminal coupled to a switching node, and a control terminal configured to receive a high side driving signal; a low side power switch having a first terminal coupled to the switching node, a second terminal coupled to a reference ground, and a control terminal configured to receive a low side driving signal; and a low side driver having a first input terminal coupled to the switching node to receive a switching signal, a second input terminal configured to receive a switching control signal, and an output terminal configured to provide the low side driving signal based on the switching signal and the switching control signal; wherein the high side power switch and the low side power switch are turned on and off alternatively, and the low side driving signal has a middle drive value between a power voltage of the low side driver and the reference ground during a dead time between the low side power switch turn off and the high side power switch turn on, to slightly turn on the low side power switch.