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LMG5200: LMG5200 combined with TAS5504A

Klaus Siegesleitner
Prodigy 30 points
Part Number: LMG5200
Other Parts Discussed in Thread: TAS5504A, TAS5504, TAS5548, SN74LVC3G14

Tool/software:

Hi!

I would like to drive the LMG5200 with PWM generated by TAS5504A.

This shouldn’t be a problem?
Are there any things to notice?
Or any reference designs available?

Thanks a lot,

Klaus!

  • 0
    TI__Expert 7665 points

    Hi Klaus,

    From the side of GaN FET the LMG5200 can work for this audio application. I have added in our audio team here to give feedback on the TAS5504A here.

    Best,

    Kyle

  • 0 in reply to Kyle Wolf
    TI__Guru 52750 points

    Hi Klaus

     As I check. The GaN LMG5200 seems needs a differential input for HI/LI to drive a half bridge GaN.

     But for TAS5504, or TAS5548 output, it's one pair OUTP/OUTM is not differential, and they are trying to drive a full H-bridge to provide audio.  

     If you want to use, you'll need to make each OUT into differential waveform first, then each OUT drive a half bridge GaN.

     Or, there's maybe full H-bridge GaN devices, and only need 2 input to control. Then you could connect them directly.

  • 0 in reply to Shadow He
    Prodigy 30 points

    Hi Shadow,

    OK - I got your point.
    But I have 2 LMG5200-EVM Evaluation Boards which have a single PWM in. From this input the differential signal for HI and LI are generated on the EVM.
    One EVM would be connected to OUTP, the second EVB connected to OUTM of TAS5504..
    And the load between the EVMs.

    Another question is: Do i need a level shifter from 3.3V Output of the TAS5504 to drive the SN74lvc3g14 behind the PWM in?

    Thanks,
    Klaus!

  • 0 in reply to Klaus Siegesleitner
    TI__Guru 52750 points

    Hi Klaus

    Klaus Siegesleitner said:
    One EVM would be connected to OUTP, the second EVB connected to OUTM of TAS5504..
    And the load between the EVMs.

    That sounds good, should be no problem.

    Klaus Siegesleitner said:
    Another question is: Do i need a level shifter from 3.3V Output of the TAS5504 to drive the SN74lvc3g14 behind the PWM in?

    From it's datasheet, seems 3.3V is just at the threshold for 5V supply. Could have a try, but maybe will lost some duty cycle.

    On the other hand, LMG5200 only needs 2.2V as high level input. If problem appears, could consider change SN74lvc3g14 supply voltage into 3.3V. Cut the original wire and use external supply....