The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> High-Power Design >> Oscillation of Coil node (buck) in DCM
https://designers-guide.org/forum/YaBB.pl?num=1403496724

Message started by ywguo on Jun 22^nd, 2014, 9:12pm

Title: Oscillation of Coil node (buck) in DCM
Post by ywguo on Jun 22^nd, 2014, 9:12pm

Hi Guys,

I have a buck converter, which operates in discontinuous-current mode. The output node that connects to coil oscillates when both PMOS and NMOS are off, because the inductor current is not exact zero when NMOS is turned off. Is it a common phenomenon of Buck operating in DCM?

The blue line named /L0/PLUS is inductor current. The line named Coil is the node connecting PMOS/NMOS drains and the coil.

Thanks in advance.

Best Regards,
Yawei