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maximum output Continuous Current of DRV8860

Shinya Muramatsu
Expert 1010 points
Other Parts Discussed in Thread: DRV8860

Hi,I'm FAE of distributor.

Now customer ask us maximum output Continuous Current of DRV8860.

It's in Datasheet,but condition only Ta=25℃ in PW package.

He  want maximum output Continuous Current of DRV8860 of condition Ta=85℃ in PWP package.

Do you have data of these condition?

  • 0
    TI__Mastermind 26065 points

    Hi Shinya

    It is highly depended on the PCB copper area of dissipation for the PWP package.

    We have a data shows a typical temperature rising for 35℃ (@25℃ room temperature) for DRV8860PWP with 8*200mA output condition.

    Our TSD point is about 150℃. So I think we still can get full output current (200mA for each channel) at 85℃Ta in good PCB dissipation without TSD tripped.

    Best regards,

  • 0 in reply to Wilson Zuo
    Expert 1010 points

    Hello Wilson

    thank you for answering.

    I understood your comment.(full output current at 85℃ is OK,because temp rise up 10℃ at 25℃.)

    but I think maximum 8ch each channel current is  330mA at PWP package in datasheet.

    our customor needs 250mA for each ch at 85℃.

    Can you answer in this case?

    Best regards,

  • 0 in reply to Shinya Muramatsu
    TI__Mastermind 26065 points

    Hi Shinya

    Sorry, I may miss this new question.

    In previous post, I mean 35C is the increment at 25C Ta. So the PWP device get to 60C @25C Ta and 200mA*8 condition.

    Also we had a TSD test data of PWP package (With enough PowerPAD copper area):

    TSD boundary @ 25C (Delta T = 150-25 = 125C) Ta,  MAX output = 350mA*8.

    We can assume that the rising temperature Delta T is proportion to the I^2. 

    So by approximating, if the Ta=85C, to the 150C TSD condition, the MAX output current is about 280mA*8. (Use the average factor of the above two example condition)

    It means 250mA*8 for PWP device @Ta=85C will be still below the TSD boundary, of course the Power PAD copper must be guaranted. In our test the copper area is about 25cm^2 at both top and bottom layer of 1oz PCB.

    Best regards,

  • 0 in reply to Wilson Zuo
    Expert 1010 points

    Hi Wilson,

    thank you very much for answering.

    I'll explain this thermal data to customer.

    Shinya Muramatsu

    Best regards,