Part Number: DRV8353RH-EVM
EVM board is operating in H / W modeInput power is + 24V and BLDC motor is connected.nFAULT alarm occurred.According to your technical data, nFAULT occurs when the VM voltage is lower than the VM_UV threshold.How can I solve this here? I can't see the VM_UV threshold on the EVM board. Therefore, it is not known how to solve this.Please reply fast
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There are many faults which will report on the nFAULT pin. Please see "Table 6. Fault Action and Response" in the datasheet for information. The nFAULT pin will respond to over-current, under-voltage, or over-temperature. You will need to check the power supplies for under-voltage and the chip for excess temperature.
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In reply to Adam Sidelsky:
HiSo I understood your answerI checked the following on my EVM board.My judgment is that the low voltage of the VCP is a problem.The test results are shown in the attached photograph.Here, the condition is set to "H" for enable.
If my judgment is correct, how can I solve the VCP low voltage problem?Please let me know if it can be solved.
This is an additional question.
A. EVM board status1.Input power: + 24V exactly2. BLDC motor connected.3. VM voltage is 12.1V in the normal state. Is this normal?
B. I suspect the burnout of the voltage protection component (TPD4S010DQAR). ? C. As a result of the above test, the VCP voltage is + 11.9V.As a result, is the VCP Charge Pump inside the chip not working?If so, what is the cause? Are chipset burned out?
Please check the question below
In reply to Insoo jeon:
There are many components connected to the VM line so I am not sure which component is damaged and pulling down the VM.
How much current is your supply taking?
current may be 0.5A below
What more should I check to fix this?
When I see your answer, is the VM voltage (approximately 12.1V) normal?Then how much is normal?In my test results above, VM (12.1V) is not a fault conditionWhat is the problem? VM voltage or VCP voltagePlease tell us what to do to fix these two problems.
Did you spin a motor with the EVM? Please tell us the testing and any changes/modifications you have made.
Test report1. Program driven The motor was driven by the PC program of the TI EVM board.
2. EVM board (H / W drive) test Operates in 1x PWM MODE PWM, DIR, nBRAKE and HALL signals (Hall A, B, C) input Motor driven
3. During the second test, the nFAULT signal is turned "on" without changing any input conditions, and the motor is not driven. Please refer to the test results above.
That is, the VCP voltage becomes Vdrain + 5V, which is described in TI technical data (DRV835x 100-V Three-Phase Smart Gate Driver).
However, in my test results, the VCP voltage is less than the Vdrain voltage.As a result, the VCP pump does not operate and the VCP voltage is small, so it is in the FAULT state and the motor is not running.Please let me know why the VCP pump is not working. (Why does not work inside the 8353 chip: suspected chip burnout, etc.)
I am constantly waiting for answers.How long do I have to wait?I suspect that a large company called TI is so vulnerable to technical support.
I am constantly waiting for answers.How long do I have to wait?I suspect that a large company called TI is so vulnerable to technical supports
Since the EVM has been modified, I am not sure what caused the damage.
Likely the VCP circuit is damaged. Did you change the IDRIVE settings?
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