Hi,
I ran into a issue with the TPS25961 SPICE SIM that I do not understand, and was wondering if someone from TI or elsewhere could help me resolve it. When running the SPICE file from TI I see a droop in the OUT rail(12VDC) at about 800ms. If you run the SPICE setup untouched and place Voltage markers on the VIN and VOUT pins you see the OUT starts to droop. When I do this same setup for the 5VDC and 3.3VDC the droop is much faster. It seems that 3.3V as a input rail will fail the 5% Threshold line quick. I have played with adjusting the DC bias points for the OV and EN/UV pins, but could not make it work. Has anyone else dealt with this SPICE model in detail and found a solution? I would expect the VOUT to track the VIN very close as long as the OV and EN/UV pins are biased correctly. I tried to insert a picture but could not get it to work. Any thoughts or suggestions would be appreciated.
Larry
