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DRV3245E-Q1: power dissipation

Sherry Liang
Genius 10255 points
Part Number: DRV3245E-Q1

Dear team,

Do we have the tool for driver power dissipation? If not, could you please tell me the calculate formula? Thanks!

Thanks & Best Regards,

Sherry

  • 0
    TI__Mastermind 26466 points

    Hi Sherry, 

    Let me look into this and get back to you hopefully middle of this week.

    Regards,

    Anthony Lodi

  • 0
    TI__Mastermind 26466 points

    Hi Sherry,

    I checked with the team and confirmed that we do have a calculator for calculating driver power dissipation for the DRV3245. I will provide it to you hopefully tomorrow.

    Regards,

    Anthony Lodi

  • 0
    TI__Mastermind 26466 points

    Hi Sherry,

    I have attached the power dissipation calculator for the DRV3245.

    Regards,

    Anthony Lodi

    DRV3245 Driver Power Calculator.xlsx

  • 0 in reply to Anthony Lodi
    TI__Genius 10255 points

    Hi Anthony,

    Thanks for your help!

    Could you please help clarify how to use? Many lines are hided, and I can't see them. Is it on purpose? How to choose line6 to line 11? How to choose line 25?

    Thanks & Best Regards,

    Sherry

  • 0 in reply to Sherry Liang
    TI__Mastermind 26466 points

    Hi Sherry,

    You are correct that there are multiple lines that are hidden, and this is done on purpose. Only the lines that are relevant to the customer for inputs and outputs are shown. 

    For lines 6-11, the options to select are: PWM, ON, or OFF. For sinusoidal motor control (including FOC), you will have all 3 high sides and low sides PWMming. For trapezoidal control, you will have one phase PWMming, one phase in Hi-Z, and one phase with the low side MOSFET on. This will effect the power from the driver since the more that the MOSFETs are switching the more current is drawn from the charge pump and the VCP_LSD internal regulator. If the customer is using sinusoidal or FOC control, they can leave lines 6-11 as all PWM. 

    For line 25, this is just a general figure for switching losses not attributable to the charge pump. It should be fine to keep this as 10%.

    Regards,

    Anthony Lodi