MCF8315C: Issue with MCF8315C1VPWPR Custom Fan Driver Board – Unable to Achieve 480 RPM

Tool/software:

Hello Team,

          We are working with the MCF8315 evaluation Board (three-phase sensorless FOC integrated MOSFET BLDC motor driver). Using the EVM, we were able to successfully achieve 480 RPM with stable operation.

          However, on our custom fan motor driver board designed with the same controller MCF8315C1VPWPR, we are facing an issue. The motor runs only up to 330 RPM. When we attempt to increase the target          speed to 350 RPM or higher, the controller immediately asserts nFAULT and the motor stops.

We have applied the same register configuration on our custom board as used on the EVM. Despite this, the behavior is different.

Could you please help us understand:

1. Why the custom board fails to run beyond 330 RPM, while the EVM works fine up to 480 RPM?

2. What possible hardware or register configuration differences could cause this fault?

3. Are there specific parameters (like motor tuning, protection thresholds, or layout considerations) we should re-verify on the custom board?

Any guidance on troubleshooting this issue would be greatly appreciated.

e2e.ti.com/.../EVM-BOARD-REGISTERS.xlsx

Kindly revert ASAP.

Thanks

Rahil Ahamed.