SLLU363 may 2023 MCF8315A
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 in overmodulation region to achieve the target speed leading to current distortion, inefficiency or noise. During an overvoltage condition, the MOSFETs, MCF8315A and motor may be stressed with continued operation in high voltage.
Step 1: Keep decreasing the supply voltage till we see a drop in the speed. Measure the bus voltage at which the speed drops and set MIN_VM_MOTOR to that value. Range of minimum bus voltage that can be configured is between 4.5 V and 12.5 V.
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 is 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 20 V and 35 V.
MCF8315A provides an undervoltage recovery mode [MIN_VM_MODE] and an 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.