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TPS25947EVM: Thermal performance

Vincent Chen64988
Expert 4480 points
Part Number: TPS25947EVM
Other Parts Discussed in Thread: TPS25947

Hi Team,

My customer is surveying TPS25947 and it could be placed at customer's power board, so the thermal performance is concerned. Customer would like to know is there a TPS25977EVM's thermal picture can be shared with him for refernece?

Thanks a lot.

Vincent Chen 

  • +1
    TI__Guru* 79181 points

    Hi Vincent,

    Customer can estimate the device junction temperature as Tj=TA(ambient temperature)+RθJA*Power Dissipation across device. For a 4 layer pcb with good amount of thermal vias under device as present in our EVM Channels the RθJA is around 42. In steady state operation the power dissipation will be some milliwatts and will not cause the junction temperature to rise to high values. During overcurrent or short circuit fault ,due to high power dissipation device junction temperature can rise to high value .This device has thermal shutdown feature that makes sure that device turns off when temperature crosses a certain threshold(TSD=154C) .

    Will this information help customer?

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Expert 4480 points

    Hi Kunal,

    Thanks a lot, I have forwarded the information to customer and that answers customer's question.

    BR,

    Vincent Chen