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DRV8818: When DRV8188 trigger the thermal protection and which part of inner circurt may trigger the thermal protection?

user4095353
Prodigy 110 points
Part Number: DRV8818

In the implementation of strict quality control，the bad product rate of 0.1% in our production drviered by DRV8188，last year. The chip burned down. But until now, we haven't found the reason.

Threre are something still confuse me .

1. What is the condition DRV8188 trigger the thermal protection?

2. Which part of inner circurts may  trigger the  thermal protection?

3. Can you show me the data of save operating area of inner mosfet?The data of SOA about inner mosfets and other details about the mosfets.

4. What are the most likely to cause chip damage? 

I guess there are two possibilities.First, I suspect that the internal thermal protection or temperature detection circuit fails, the second, inner mosfets exceeds the safe operating area. 

But I don't know how to confirm my guess.

What's the most common damage to this chip that you've encountered before?

In the implementation of strict quality control, we have bad product rate of0.03% in the control.

  • 0
    TI__Guru 56650 points

    Hello,

    1. What is the condition DRV8188 trigger the thermal protection?

    The datasheet lists the thermal protection threshold. When the IC temperature reaches that threshold, the thermal protection would be triggered.

    2. Which part of inner circurts may  trigger the  thermal protection?

    DRV8818 has integrated power FETs. In general, the power FETs should be the hot spot to trigger the thermal protection.

    3. Can you show me the data of save operating area of inner mosfet? The data of SOA about inner mosfets and other details about the mosfets.

    The minimum OCP current is 3.5A. Let us focus on the root cause of this failure first. What inner circuit gets the damage? What condition can cause that damage?

    4. What are the most likely to cause chip damage? 

    Would you contact local sales or FAE to submit a FA? So, FA team can help to check which inner circuit gets damage.