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MCT8316ZTEVM: nFAULT enabled when duty cycle is less than 10% in MCT8316ZTEVM

SUBRAMANYA SRIDHAR
Prodigy 10 points
Part Number: MCT8316ZTEVM

               We have purchased MCT8316ZTEVM evaluation module vide our Order No. T03830710 to run a motor.

Whenever we set low duty cycles on eval kit using provided potentiometer, nFAULT LED starts glowing, and motor stops running. It takes a power cycle to bring the board back. To counter this, we have put a 5 kOhms resistor as a pullup to nFAULT pin externally, and now the board need not be power cycled every time we give a low duty cycle, the nFAULT LED still goes up, but now it goes  down whenever we increase duty ratio to roughly beyond 10 %.

How to mitigate this problem, so that any arbitrarily low duty ratio can be provided to MCT8316ZTEVM?

 

Regards,

K.S.N.Raju

Aero Rel Systems Pvt. Ltd.,

Hyderabad, India

  • 0
    TI__Expert 7865 points

    Hi Raju,

    This may be due to your motor having low inductance. The default Slew Rate configuration on the EVM is set at the lowest value 25V/us, which could cause the motor to stall at lower input duty. Increasing the Slew Rate to 200 V/us by changing the resistor configuration on the EVM could help.

    Regards,
    Eric C.