DRV8353RH-EVM :

Insoo,

Thanks for posting on the MD forum!

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.

Regards,

-Adam 

Hi
So I understood your answer
I 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.

Thank

Insoo Jeon

This is an additional question.

A. EVM board status
1.Input power: + 24V exactly
2. 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

Insoo,

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?

Regards,

-Adam

Hi

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 condition
What is the problem? VM voltage or VCP voltage
Please tell us what to do to fix these two problems.

Thank

Insoo Jeon

Insoo,

Did you spin a motor with the EVM? Please tell us the testing and any changes/modifications you have made.

Regards,

-Adam

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.

Hi

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

Insoo Jeon

Insoo,

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?

Regards,

-Adam

Hey
EVM board is not modified
However, it was operated in H / W mode (according to your technical manual)
Idrive has not been changed (original EVM)

For no other reason, the VCP pump does not work.
So, I asked you for the cause and solution.
I sent the test results in detail.
It should have been a minimal analysis of my test results.

As a result, the VCP pump inside the chip does not work without cause.
As of now I can't trust these chips.
Naturally it cannot be applied to my product
Is my conclusion

Insoo Jeon

Insoo,

If we can answer any questions further please let us know. 

Regards,

-Adam

Hello
I haven't modified the evm at all.
And idrive is also original.

Explain to me why the VCP pump is not working even now.
I have already delivered the detailed test results to you.

If this reason is not explained, I can no longer trust this chip.
So my conclusion now is not to apply your chip to my product.

More than.

Insoo Jeon

Insoo,

We can try with the lowest IDRIVE setting and check if the problem still occurs.

Would you like me to send you some DRV8353 devices so you can swap them onto your board?

Regards,

-Adam