Why I cant increase IOUT_OC_FAULT_LIMIT （0x46) on the GUI

John, you need to add the command to the CMD_PFC #define, not the DC/DC one. 

Make sure you select the CMD_PFC in the bitmask generator tool and read it in from the chip before you add the new command. 

Does your version of the PFC code have a pmbus command specifically implemented or do you have to write it?

Normally there is no way to measure IOUT on a PFC, so we do not implement this code.

Have you added hardware to measure this?

John, IOUT is current out of the capacitor, not the inductor current. The existing CTs in the EVM measures the MOS FET current, which will show you the rising inductor current. That already should have a limit enforced by the comparators and DACs on the ADC pins.

That value for the DAC is hard coded, and we do not provide a PMBus command for it. If you want to do that, you will have to write a PMBus command for yourself. There are lots of other command examples in the code which you should be able to use as a starting point.