Hi team
customer use the steady input voltage and keep load steady, buck work in CCM. they can test that PWM falling timing has jitter as shown in the picture:
I checked in datasheet TPS25221 doesn't have spread spectrum function.
In which part of the datasheet has the limitation data for that? what is the normal range of falling timing jitter?
thank you
best regards
Joe
AUG 11
Hi Joe
Below EVM waveform show that the jitter is smaller under the same setups.
SW jitter does not have a limitation or range, SW jitter is large indicates a more sensitive response to the VFB noise signal, 1. VFB has some noise coupling, which is related to the layout, 2. bandwidth is large, but it does not mean that the IC is unstable. This all will let us see SW jitter is large, but SW jitter itself is not a problem, the key is that it may increase the output ripple and transient, if the ripple and transient results can meet the requirements in customer board tests, I think the SW jitter is not a problem.
