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DRV8871: Query on junction to ambient.

Shinu.V.Mathew
Genius 14975 points

Part Number: DRV8871

Hi Team,

1)In the mentioned datasheet  junction to ambient thermal resistance is less than the junction to case and junction to board. Theoretically  the junction to ambient  thermal resistance should be more than junction to case thermal resistance. Can you please clarify is there any specific reason behind given numbers in data sheet?

2)Please provide the maximum power internal mosfet can dissipate.

Thanks in advance for the support and looking forward for your immediate response. 

Regards, Shinu Mathew.

  • 0
    TI__Guru 56650 points
    Shinu Mathew,

    1. ThetaJA is lower than thetaJC_top. This is correct because the thetaJC_bottom is much smaller and the most heat spreads out from the bottom side.
    2. It is depends on the ambient temperature (TA) and the layout (thetaJA). Please check datasheet page 15 "10.4 Power Dissipation" section.