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DRV8300U: boot diode specifications

Keith Keller
Expert 7230 points
Part Number: DRV8300U

Tool/software:

Hello,

Would you be able to provide specifics on the integrated boot diode in the DRV8300U?

Specifically in the datasheet it says to limit current with capacitance above 1uF.

Thank you, Keith

  • 0
    TI__Mastermind 23506 points

    Hey Keith,

    How's it going?

    The bootstrap cap charging current will go from GVDD through the Boot diode. The design for this part was done such that the current through the diode does not need to be restricted with up to a 1uf BST cap. 
    My question is if the customer plans on using more than 1uf per BST cap and if so, what is the motivation? (What MOSFET is being used?)

    Best,
    Akshay

  • 0 in reply to Akshay Rajeev Menon
    TI__Expert 7230 points

    Hi Akshay,

    One of our requirements for our project is to be able to keep the high-side FET on for 50ms. We have tested the bootstrap hold-up time, and with 10uF, we can keep the FET on for 37.85ms before bootstrap UVLO is active. However, according to some numbers that I ran, 10uF should be able to keep the high-side FET on for a much longer time.

    Thank you, Keith

  • 0 in reply to Keith Keller
    TI__Mastermind 23506 points

    Hey Keith,

    What is your application , where you need 50ms of on time?

    I will review the email and respond there.

    Best,

    Akshay