TPS56C215: TPS56C215

Hi,

So your spec is the noise on Vout should be within 60mV, including both ripple and under/overshoot when doing load transient, right?
First of all, please make it sure that you are measuring the Vout with proper way. GND of the probe should be connected to be smallest loop area, or it can pick up high frequency noise into your oscilloscope.
You may refer to the link below,
e2e.ti.com/.../how-you-measure-your-ripple-can-make-you-or-break-you


Secondly, judging from your waveform, are you doing something like load transient test? If so, could you tell me your load setting? I mean, some settings like 2A-10A, 2.5A/us.
Then the spike might be under/overshoot. We will need to optimize the loop response to achieve better transient performance. Actually, there is so much output capacitance on the schematic. There is definitely no help to improve the load trans performance.

Regards,
Hao

Right, include both ripple and under/overshoot.
The measure made with differential probe, very small loop.
Load setting: 4 A to 12 A to 4 A transient with 1 µs slew
rate (8A / µs).

Hi,

OK, got it. Basically you will need a faster loop response.
Can you do the measurement again with the probe method I metioned? I'd like to know how much improvement we need to meet your requirement.
Thanks!

Regards,
Hao

Hi,

first of all, thanks for your support.
the link you mention in the previous comment not working.

Thanks,
Niv.