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TIDA-010936: TIDA-010936 GAN Voltage Spikes

Aleksandr Sheianov
Prodigy 185 points

Part Number: TIDA-010936

Tool/software:

Hi,


After exploring the reference design of TIDA-010936 I found that in its specification that it is designed for the input bus voltage range of 12V to 60V. The GAN switch ratings are 100V, however the step-down dc-dc voltage rating of LMR38010FDDAR is 80V. In case of the voltage input 60V it is possible that voltage spike of turn-on turn-off transients of GANs can be higher than 80V. What would happen to LMR38010FDDAR in this case as it is voltage rating is 80V?


Thank you very much for your feedback.

  • +1
    TI__Intellectual 820 points

    Thanks for your question about TIDA-010936. 

    Your understanding is correct. We should keep the DC bus voltage <80V to protect DCDC device. But there is still another method if you want to test the board with > 80V voltage: 

    1. remove 80V DCDC-LMR38010

    2. soldering U12 and all other components around it. 

    3. Use a external 5.5V on J7 to generate 5V on board 

    Then your board will not has 80V limitation. 

    But you still need to be careful with GaN device maximal voltage, pls check with the datasheet. 

    Hope it's helpful

    Eason