Hello, I'm hoping you can help determine what fault might be occurring in our application of the MCT8316AV. We have tested this in both inductor and resistor mode and received the same results. The motor starts up and runs just fine, but when it encounters an unexpected increase in load request, (similar to when a car encounters a speed bump, for example) it struggles to overcome this, the recorded speed increases greatly, a fault is triggered, the buck voltage begins to decline down to match the DVDD voltage. The buck voltage seems to automatically recover after about 2ms when the fault automatically clears. We were suspicious that the MTR_LOCK fault was the cause of the this, but our register values don't align with that theory. Here are our current register values for FAULT_CONFIG1, FAULT_CONFIG2, and GD_CONFIG1:
Part Number: MCT8316A
FAULT_CONFIG1: 0x78F43000
FAULT_CONFIG2: 0x17C5A009
GD_CONFIG1: 0x1C441600
I was also monitoring the I2C bus to see if we could read any faults. The only faults read were:
GATE_DRIVER_FAULT_STATUS: 0x90550000 Which is an "overcurrent condition is detected", but based on our register values, this is report only and would not trigger a fault.
CONTROLLER_FAULT_STATUS: 0x80040000 Which is a "lock current limit fault detected", but based on our register values, this is report only and would not trigger a fault.
Based on all of the information provided above, I am hoping to determine 2 things:
1. What could be the actual cause of the fault pin driving low and automatically recovering after 2ms based on our config register values?
2. What is causing the buck voltage to drop when the fault occurs and then recovering when the fault clears? Hopefully the answer to the first question will also answer the second.
Let me know if you need any other information to help solve the problem, Thanks!
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