Tool/software:
I protect my +28V electronic module with TPS16632:
It's set to handle 6A or 110W. The PGOOD goes on into the ENABLE pin of my Buck converter (3.3V) so the +28V_POST_FUSE will be saturated before my 3.3V MCU even starts working.
So far so good. Right after this eFuse I have an 120W 12V DC/DC converter controlled by my MCU:
On 12V_OUT I have a lot of load. Up to around 90W, hence my 110W limit on eFuse.
The problem is, I can't draw even close to 110W or 6A before the PGOOD goes low, hence cutting the power to my MCU which turns the 12V DC/DC off. There is no exact Amp or Watt but these are two last values I got to measure before it got cut off (I'm slowly increasing the fan speed until it "trips"):
This is the timeline:
The instrument (Saleae Logic Pro 8) does not handle more than 10V, but in reality anything at 10V is actually 28V.
A closer look:
I have no idea what is causing this. There is no mention in the data sheet as far as I can see where the PGOOD goes low without FLT (unless SHDN is triggered, which it's not).
What can I do? What am I missing?
