PMICLOADBOARDEVM: Load Transient design for the negative power rail-reference to PMICLOADBOARDEVM

Part Number: PMICLOADBOARDEVM

Tool/software:

Hi TI expert team,

     I'm building a transient measurmentt tool for both positive supply and negative supply, I have find this PMICLOADBOARDEVM for reference, it is great and I'm looking for how to modify this to test the transient performance for the negative power rail, is there any reference or guideline for this? Thanks a lot.

     I have build a circuit as below, but it works not as expected. Lookong forward for you advice and suggestion.

     

BR

Sean