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DRV2700: Ona custom PCB, one driver works, the second one doesnt work properly. Bad PCB layout?

A S
Prodigy 20 points
Part Number: DRV2700

Tool/software:

Hallo,

I have designed a custom PCB for DRV2700. A board holds two driver IC in the same confifuration.

The problem is, that one IC works fine, but the second one has issues. It either works shortly and then dies (the magic smoke escapes), or has issues.

I have replaced the chip on the problematic spot  5x times, still no reliable function/total failure.

It is either my soldering skill (I solder them manually using hotair and a soldering iron) or the layout is not correct.

The only thing that looks not right in the layout is that the one input line (in-)  runs under the main Inductance (L4). I am afraid it can cause high voltage interference and kill the chip. Can it be the source of the problme?

Can someone please look at the layout and varifly if I did or didnt do a mistake (see attached images)

?

Thanks in advance

  • 0
    TI__Expert 3620 points

    A S, 

    Thanks for reaching out. I will look into this and provide the feedback as soon as possible. 

    Best,

    Hailong

  • 0
    TI__Expert 3620 points

    A S, 

    1) What are your gain settings? Are they the same? Are they driving two separate loads? Also, it seems your naming convention is G10, G11 for socket 1. It might be G20, G21 for socket 2. Just want to make sure the ports are connecting correctly. 

    2) Layout can be the issue as you mentioned. 

    Regarding soldering, these parts are pretty tiny though - I feel like using a soldering iron would be difficult.  Need to make sure no solder bridge somewhere. 

    Thanks

    Hailong