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DRV8312: Input DC power measurement

Angus Wu
Prodigy 10 points
Part Number: DRV8312

Tool/software:

Hi, I'd like to measure the efficiency of the motor inverter however I'm having trouble finding a possible connection point to measure the input DC voltage and current. I'm using the adapter and do not have a power supply to power the kit.

The current probes I'm using are clamp on and the differential voltage probes I'm using have grabber tips. Are there measurement points already on the board for me to do so or will I need to make modifications to do so?

  • 0
    TI__Mastermind 23676 points

    Hey Angus,

    What is the application for this project? What is your targeted motor voltage and motor current? This is an lder device so i am wondering if we might be able to use newer device instead.

    Are you using the following reference design ?

    https://www.ti.com/lit/ug/tidu318/tidu318.pdf?

    I would try to use the PVDD test point for the the voltage measurement. if there is not a PVDD resistor to depopulate then you might have to cut the pvdd trace and place the dmm inline with pvdd trace.

    Best,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 10 points

    Hi Akshay,

    Thanks for the response. I'm trying to test an efficiency measurement tool in a Tektronix 5 Series oscilloscope. The output current and voltage I have no issues measuring. The probes I have access to are passive, differential and current clamp probes.

    Yes, that is the reference design I'm using.

    I'm borrowing the demo kit at the moment so since it isn't my own I'd rather not cut traces and other changes to the board and it's components if possible.

  • 0 in reply to Angus Wu
    TI__Mastermind 26826 points

    Hi Angus,

    Akshay is out of office most of this week, but will work to provide a response either end of this week or next week.

  • 0 in reply to Angus Wu
    TI__Mastermind 23676 points

    Hey Angus,

    In this device the GVDD per phase is used as the supply for the gate driver. Both PVDD and GVDD are being used to power other components on the board so the measurement you take from the board will not be very accurate.
    Have you looked at the iPVDD and IGVDD spec in the datasheet?

    Best,

    Akshay