UCC28951: UCC28951 DCM SR control

Red Yen

Part Number: UCC28951

Hi Support team

My customer used UCC28951 to do master & slave PSFB control.
They are asking about UCC28951 SR DCM control. Will there be any problems when the DCM set point is too low?

over 4 years ago

0 Pye Naing over 4 years ago

TI__Prodigy 590 points

Hello,

Your thread has been assigned. You should receive a reply shortly.

0 Mike O' over 4 years ago in reply to Pye Naing

TI__Guru* 86266 points

Hello,

You need to set the DCM point to turnoff the FETs before critical conduction.

If you don't do this and the SRs stay on a negative current will develop in the transformer and SR FET. When you turn the SR FET off this negative current will cause excessive voltage on the SR and could damage it.

Regards,

Power management

Power management forum

UCC28951: UCC28951 DCM SR control