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DRV8432: DRV8432 burn GND-C/D and OUT-D when 24V power up

user5820137
Prodigy 20 points

Part Number: DRV8432

hi ,

Recently we have a product that use DRV8432. But there are 4 pieces out of 200 had burn the OUT-D and GND-C/D, OUT-B and GND-A/B when 24V powered up.  Can anybody tell what is the potential reason? thanks a lot.

  • 0
    TI__Guru** 114905 points
    Hi user5820137,

    Can you provide a few details?

    Please note the recommended min OC_ADJ resistor in Cycle by Cycle mode is 24kOhms. How much current do you need?

    Are you using a heat sink? If use, what is the size of the heat sink?

    The image of the device shows many of the leads appear to be detached from the PCB. Please inspect the working devices for solder connections.

    What is the PWM frequency?

    What is the lot trace code of the devices (a photo of the top of the device showing all markings will help)?
  • 0 in reply to Rick Duncan
    Prodigy 20 points

    hi Rick

    Please check the picture showing the burned device. The trace code is 8BZNX74G4.

    We have used this chip for over 1 year, this is the first time the device burned. The burn happened when power was up, the PWM was not running. The heat sink is fine on other devices. 

    Maybe this batch has some problem. Hope you can help to find it. 

    Thanks very much.

  • 0 in reply to user5820137
    TI__Guru** 114905 points
    Hi user5820137,

    We will make arrangements to contact you directly for more information. For now we will close this post and update if necessary.