Hello,
I received an email stating my previous sim might have suggested a bad operating point, so I'm trying to rerun this.
Since this is an existing marginal design, I'm trying to model it as accurately as possible, using real component values to figure out how marginal the design is. The design I'm trying to simulate uses Y5V output caps, which are quite variable.
My design:
TPS54240
22.5-23.2Vin, 12Vout,
1.5A out
Using the DC bias graph on this post:
https://e2e.ti.com/support/development_tools/webench_design_center/f/235/t/467378
I found that a 50V cap has ~94% at 12v. I'm using 4x 10uF Y5V, which correspond to an idea 16uF cap. I also noticed my inductor is rated for 3.48A, while WEBENCH wants 3.5A.
The phase/gain margin appear to be correct, however the SIMs don't appear to run. See the screenshot below--the load transient simulation doesn't change in current:
Is this a bug with the TPS54240 model? Or is WEBENCH only able to simulate 'recommended' designs?
Thanks,
Walt
