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DRV8350: Burned chip and VGLS failed

Candy T
Prodigy 80 points
Part Number: DRV8350
Other Parts Discussed in Thread: CSD19532Q5B

Hi

I am using the DRV8350RH chip. VM and VDRAIN are not tied together. VM is generated via a DC regulator from VDRAIN.

Are there any timing sequence requirement among VM, VDRAIN and ENABLE? By the way, the ENABLE pin requires an external power to pull up high before the chip can function. 

 

Also, why is there a maximum pulse width requirement on ENABLE pin to reset the driver chip, can we keep the ENABLE pin low longer than the maximum pulse width?

 

In the last six months, we have burned up 10 of DRV8350RH chips. Some of them may due to higher biasing of IDRIVE/VDS, but others simply lost VGLS over time. What can we do to prevent lost of VGLS? VGLS will drop down to 3.8V when it failed.

 

 Regards,

Candy

  • 0
    TI__Guru 61380 points

    Candy,

    Thanks for posting on the Motor Drives Forum. 

    To better understand your issue and help prevent further damage, could you share your output rise/fall time requirement? Also please let us know the FET model number.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 80 points

    Hi Adam,

    I am using TI CSD19532Q5B MOSFET and the rise/fall time is 200ns/100ns.

    I have 2 in parallel MOSFETs are used per gate output. 

    I'd like to know any timing sequence requirement among VM, VDRAIN and ENABLE?

    Thanks.

    Regards,

    Candy

  • 0 in reply to Candy T
    TI__Guru 61380 points

    Candy,

    The device has VM and VDRAIN undervoltage protection so it will not operate or be damaged if these come up in different orders. The device also cannot be enabled if the supplies are not up. 

    Can you share the schematic?

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 80 points

    Hi Adam,

    Can I share my schematic to you via private email not in the forum?

    Does DRV8353RH has Low-side Gate oscillate issue like DRV8350RH?

    When I put scope probe on High Gate output and Low Gate output, I saw the oscillation on Low Gate output as shown below.

    The oscillation also cause VM to oscillate slightly. That happen on the lowest IDRIVE setting and the one level above it.

    The oscillation caused the DRIVER IC to fail after we run the motor a few times.

    How can I send the pdf to you?

    Is there a real solution to solve this problem?

    We have added up to 22 ohm between the High/Low Gate outputs and the MOSFETs, but not working.

    Regards,

    Candy

  • 0 in reply to Candy T
    TI__Guru 61380 points

    Candy,

    Yes you can send me schematic and layout over email: adamsidelsky(at)ti(dot)com

    Regards,

    -Adam