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Tuning the Analog Feedback Loop to work with SiDR220DP Mosfet

gkaur2
on Jan 27, 2018

Hi All,

I need your urgent help to understand the failure in our PCB.

We had designed the Analog feedback loop to control current through MOSFET as we are using mosfet as virtual load.

when we were using this LOOP with SiE844DF Mosfet, everything was working good but in new PCB , the whole design is same except the mosfet . Now we are using SiDR220DP MOSFET with same loop.

Please let me know where we are doing wrong, is there need to change this loop gain or something?

if yes, please help to tune this loop.

I have attached schematic of Analog loop, Mosfet, and ltspice file for complete loop.

attachments.zip