Hi team,
My customer observed startup waveform which has a step in beginning, this was captured after they insert a fan module in the output of TPS259261.
If there is no fan module, the startup waveform is smooth.
I thought it's caused by the capacitance in fan module so I change dv/dt cap from 1nF to 16nF, but still saw a step in beginning.
I thought it's not harmful for the design, but customer would like to know what's the root cause?
Do you have any idea about that?
Thank you.
TPS259261 schematic:
Fan module:
Startup without fan module:
Startup with fan module:
