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Question on DR8432 GVDD

John Cole
Intellectual 340 points

Quick question on the GVDD_X supply: I see the minimum supply is 10.8 V; what happens if the voltage drops below that?  I have a 6V source, and I'm wondering if I could run it at that, or if I have to use a dc-to-dc voltage converter (charge pump).  

  • TI__Guru 55605 points

    John,

    GVDD under-voltage protection will turn the switching off at 8.5V.  Unfortunately, it will not work down to 6V.  Please see page 7 tabular data about the middle of the page. 

     

  • in reply to Ryan Kehr
    Intellectual 340 points

    What is the maximum current draw on all four GVDD's?  I'm trying to size the 12V power supply.

    Thanks!

  • in reply to John Cole
    TI__Guru 55605 points

    John,

    For GVDD, it is quite small at <50mA (total).  For VDD, the current can increase depending on your load due to substrate current collection by the output FET guard rings.

    We recommend sizing VDD current to 5% of the rated output current and no less than 100mA.   For example, if your load is 10A, then VDD should be sized for 500mA.  This assumes worst case under junction temperatures at 125C or greater.