UCC28951: Sequencing differences between UCC28950 and UCC28951

Christopher Arntzen

Part Number: UCC28951
Other Parts Discussed in Thread: UCC28950

I need to know the timing sequence during power down for UCC28950 and UCC28951, specifically for the synchronous rectifiers.

From a previous support inquiry I was told that the UCC28950 always turns off FET E, then FET F during power down.

Is the same true for UCC28951? Or does it turn off FET F before FET E during power down?

over 3 years ago

0 Mike O' over 3 years ago

TI__Guru* 85616 points

Hello,

There is not any sequencing and timing differences. Parametrically the devices are identical. The only difference is the UCC28951 can be used at duty cycles greater than 90% where the UCC28950 cannot. The differences between the two parts is described in an application note you can find at the following link.

https://www.ti.com/lit/pdf/slua853

Regards,

Power management

Power management forum

UCC28951: Sequencing differences between UCC28950 and UCC28951