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Original question:

LMG3410-HB-EVM: Idea for suppress heat LMG3410R070 Daughter card

LMG3410-HB-EVM: do we have power consumption data for this EVM?

Yuan Tan63
Expert 3280 points
Part Number: LMG3410-HB-EVM

Hi,

Customer use our EVM for testing, and they use voltage source to provide HVBUS voltage, but they see when without load, the HVBUS=400V, current through HVBUS is 35mA, it looks big.

Do we have power consumption data for this EVM?

Best regards,

Yuan Tan

  • 0
    TI__Prodigy 30 points

    Hello Yuan. Can you give me some more information?

    1. Does the EVM also have the GaN daughter card populated?

    2. Are they only applying the 400V HVBUS or are they also powering the EVM with 12V?

    Regards,

    Tobin

  • 0 in reply to Tobin Hagan
    Prodigy 30 points

    1） we only have the GaN daughter card ，and have maken a test board。

    2）we apply the 400V HVBUS and  also power the card  with 5V

  • 0 in reply to hhhei
    TI__Prodigy 30 points

    Some more questions:

    1. Is the device switching, but no load?

    2. If it is switching, what is the frequency?

    Regards,

    Tobin

  • 0 in reply to Tobin Hagan
    Prodigy 30 points

    Tobin Hagan said:

    Some more questions:

    1. Is the device switching, but no load?  

      1） switch；

       2）

         2.1 no load 

         2.2  load  ： 1K

         2.3 load  ：  5K

    2. If it is switching, what is the frequency?

    fre：200kHz

    Regards,

    Tobin

  • 0 in reply to hhhei
    TI__Genius 16390 points

    Hello,

    The 35mA with 400V does seem to be a lot since it will be 14W on the FETs. 

    Here are some questions and steps to take:

    1. You mentioned in your notes the device is heating up with open output. Is the device getting hotter when it's loaded or it went back to normal?

    2. Could you try to lower the switching frequency to say 100kHz and see if the current is halved?

    3. Could you try to lower the bus voltage and see if the current is scaled down?

    Regards,

  • 0 in reply to Yichi Zhang.
    Prodigy 30 points

    Yichi Zhang. said:

    Hello,

    The 35mA with 400V does seem to be a lot since it will be 14W on the FETs. 

    Here are some questions and steps to take:

    1. You mentioned in your notes the device is heating up with open output. Is the device getting hotter when it's loaded or it went back to normal?

          keep hot。

    2. Could you try to lower the switching frequency to say 100kHz and see if the current is halved?

          i rember low switching frequency， the current is halved。 i confirm again today。

    3. Could you try to lower the bus voltage and see if the current is scaled down?

         yes。

    Regards,

  • 0 in reply to hhhei
    TI__Genius 16390 points

    Are you able to capture switch node waveform? Also what's the dead time setting?

    Regards,