Tool/software: WEBENCH® Design Tools
I have been trying to debug this circuit for some time now.
The LMZ22003 seems to be latching to max output voltage and even if I change the RFBB resistor, I can't seem to get the latched output voltage to go to the desired voltage level. The 5V rail for the enable pin is activated much later but that should not affect the output voltage at all. Is it possible that the chip itself is not functioning any longer? Also, the voltage at FB pin is greater than 1.6V.
Below is the schematic diagram of the part.
-Dan