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DRV8245-Q1: About Iout(max).

Leo Ma
Expert 3686 points
Part Number: DRV8245-Q1
Other Parts Discussed in Thread: DRV8144-Q1, DRV8145-Q1

Tool/software:

Hi Expert,

Have a nice day!

DRV8245-Q1’s Iout(max) is 32A, does it mean it can support 32A continues current for long time?

Thanks!

Best Wishes,

Leo

  • 0
    TI__Mastermind 24420 points

    Hi Leo,

    This item in the Features list is based on the minimum OCP current specification for the highest I_OCP setting. So this Feature is really describing the rated max pulse (time of ~6us) current the device can support.

    The max continuous current is more dependent on a couple of factors like ambient temp, slew rate, PWM frequency, copper area on the PCB. For a general guide we recommend looking at the Transient Thermal Impedance (RθJA) and Current Capability table (Table 7-1) in the datasheet. If the customer would like to analyze the temp rise based on thier load profile, they can use the Full Bridge Driver Junction Temperature Estimator.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    TI__Expert 3686 points

    Hi Joshua,

    Thanks for your useful reply.

    Customer’s application needs support 12A @ 1 sec (with PWM) in some special situation.

    I find it could support 7.7A @10 sec, could you help to evaluate if it can support 12A @ 1 sec  (with PWM)?

    Best Wishes,

    Leo

  • 0 in reply to Leo Ma
    TI__Mastermind 24420 points

    Hi Leo,

    The DRV8245-Q1 cannot support 12A at 1 second given the conditions listed below the Transient Thermal Impedance (RθJA) and Current Capability table . The max current that can be supported at 1 second would be close to 10A.

    To support 12A at 1 second we would have to use the DRV8144-Q1 or the DRV8145-Q1. Both of these drivers are half-bridge drivers so two would be needed if a full bridge is required for the load.

    Regards,

    Joshua