SLLU336A May   2021  – January 2022 MCT8316A

 

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4.2.2 Monitoring power supply voltage fluctuations for normal motor operation

In applications where the power supply may fluctuate, it is recommended to specify the minimum and maximum power supply voltage range. During an undervoltage condition, the motor might operate at lower speeds. During an overvoltage condition, the MOSFETs, MCT8316A and motor may be stressed with continued operation in high voltage.

Step 1: Keep decreasing the supply voltage until we see a drop in the speed. Measure the bus voltage at which the speed drops and set MIN_VM_MOTOR to that value. The range of minimum bus voltage that can be configured is between 4.5V and 12.5V.

Step 2: Keep increasing the bus voltage to a point where the motor phase voltage reaches the maximum rated voltage of the motor. MAX_VM_MOTOR will be the bus voltage at which motor phase voltage reaches the maximum rated voltage of the motor. Range of maximum bus voltage that can be configured is between 20V and 35V.

Note:

MCT8316A provides an undervoltage recovery mode [MIN_VM_MODE] and Overvoltage recovery mode [MAX_VM_MODE]. Undervoltage recovery mode can be configured to either automatically clear Undervoltage fault [MTR_UNDER_VOLTAGE] or latch on Undervoltage fault. Overvoltage recovery mode can be configured to either automatically clear Overvoltage fault [MTR_OVER_VOLTAGE] or latch on Overvoltage fault.