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TPA3131D2EVM: Quiescent current not in line with datasheet info

Francisco Jose Toledo
Prodigy 20 points
Part Number: TPA3131D2EVM
Other Parts Discussed in Thread: TPA3131D2

Hi all, 

After doing some current consumption tests on TPA3131D2 eval board, I have measured a  quiescent current that is not in line with the numbers on the datasheet.

The quiescent current was measured using the eval board with no load connected to the output. The result was 32mA with 7.4V PVCC.

According to the datasheet, at 7.4V PVCC with no load or filter, the quiescent current typically is 16mA, half of what we have measured.

Last revision of the datasheet was in Jan 2015, I don’t know if numbers have changed in further revisions.

In the datasheet there is no info about max values but usually if no info is provided, max values is about 5-10% higher than type values at room temperature. 

Could someone confirm to me the datasheet values or point me to the right direction?

Regards, 

Fran

  • 0
    TI__Mastermind 24835 points
    Hi Francisco,
    How much PWM frequency are you using? PWM switching loss is high with high switching frequency. The idle current in the datasheet is for the current going into the PVCC/AVCC pins of the AMP device. Need to exclude the current assumption on the other components/parts on the board(e.g. biase resistors, transistors...).
    As you mentioned, there is no max value of the idle current shown in the datasheet. According to my personal previous experience, it could be get to around 30mA on some of the parts.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    Prodigy 20 points

    thanks  Shawn Zheng for your quickly response, 

    PWM frequency is set to 400KHz and the gain to 20dB. There is nothing attached to the eval board. I can't see what is taking 16mA extra but if from your previous experience is not unusual to get values around 30mA, then I guess there is nothing wrong with it. 

    Regards, 

    Francisco J. Toledo

     

  • 0 in reply to Francisco Jose Toledo
    TI__Mastermind 24835 points
    Hi Francisco,
    Thanks for the update. If you remove the pull-up/down resistors, Q1 transistor and the snubbers on the output pins, the idle current could be lower on the EVM.
    Best regards,
    Shawn Zheng