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TIDA-01371: How does shunt MOS circuit work?

Part Number: TIDA-01371

Hi TIer

My customer would like to understand how the shunt circuit works as shown:

how does it operate the M0S in the nonlinear region? Because the customer's M0S on their PCB board is saturated.

The customer also simulated the shunt circuit as shown:

The simulation was good, but there was a problem with the actual board.

So we want to understand how the shunt circuit works to find the root cause.

Thank you very much.