This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC28951: Different pulse width on OUTA-B-C-D

Part Number: UCC28951
Other Parts Discussed in Thread: UCC28950

Hi expert team

Our customer is developing 5kW DCDC with UCC28951, voltage mode, but we encountered some tricky issues as below:

Yellow-OUTA, Green-OUTB, Blue-C, Red-OUTD

We found that the pulse width are different, for fig 1, Yellow-OUTA pulse width is 5.7us, but for fig 3, Green-OUTB is shorter than OUTA.

And Red-OUTD is also shorter than 5.7us. And this mismatch will continue for several cycles.

This issue can be easily caught and it occurs in light and heavy load. From our side, at least A-B are fixed 50-50 duty cycle, but in this case, each OUT channel is different on pulse width.

Any insights on it? Thanks!