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  • TI Thinks Resolved

DRV8353: some questions about Vglx .

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Replies: 4

Views: 61

Part Number: DRV8353

Why does GLA have periodic undershoots and does it have anything to do with IoutA? Will it affect the driver chip? What should be done if it can be avoided? This picture is from the drv8353 data sheet.

  • Song,

    Thank you for posting on the MD forum!

    Your image didn't come through, could you please repost it.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

  • In reply to Adam Sidelsky:

  • In reply to song guo:

    Hey Song,

    It's difficult to tell the cause of the periodic undershoots specifically for this image. However generally you can get some undershooting if IDRIVE is set too high. The IDRIVE parameter is part of our Smart Gate Drivers and allows you to easily control the MOSFET slew rate. To avoid excessive undershooting you would have to configure your IDRIVE setting appropriately.

    If we look at the Absolute Maximum Ratings in the datasheet, you can see GLx is rated for up to -1V continuous and -5V transient for 200ns. Exceeding either of these ratings could cause unexpected issues so we recommend adjusting IDRIVE to remain within these boundaries.

    Additionally, we have an FAQ that walks you through the HOW and WHY of configuring the best IDRIVE for your system: 

    Regards,

    Paul

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