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TAS5717 Idle Power

DALIBOR KRSMANOVIC
Intellectual 275 points
Other Parts Discussed in Thread: TAS5717, TAS5713

Hi,

In my design I am using TAS5717 and I notice that after I initialise the PA, it starts to dissipate around 2.5 W before I start feeding any signal to it.  Looking at the datasheet it is not obvious that this is normal and of course both the IC and the output inductors get really hot.

This does not seem right so could you kindly suggest the possible cause for this?

I checked the hardware design and it seem to be as per datasheet.

  • 0
    TI__Guru 57800 points

    Hi, Dalibor,

    This is not a correct behavior from the amplifier, can you please provide the register configuration used as well as a capture of the output of the amplifier?. Did you followed the PCB layout from our EVM?,

    Thanks and Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Intellectual 275 points

    Thanks Diego,

    The layout is of course not identical but very close to what is on the EVM kit.  Here is the listing of the settings file in case you can make any sense of it:

    ! I2C Configuration file for TAS5713
    X1B 00
    X1B 00
    X03 80
    X11 77
    X12 7F
    X13 77
    X14 7F
    X1C 07
    X0A 30
    X0E F1
    X00 6C
    X50 0F 70 80 10
    X25 01 02 13 45
    X70 00 80 00 00
    X71 00 00 00 00
    X74 00 80 00 00
    X75 00 00 00 00
    X46 00 02 06 23
    X05 40
    X56 00 40 00 00
    X57 00 02 00 00
    X07 03 FF
    X40 05 1C 00 00 05 1B FF FF
    X07 03 FF
    X07 03 FF
    X3B 00 01 00 00 00 7F 00 00
    X07 03 FF
    X07 03 FF
    X3C 00 00 01 00 FF FF FF F0
    X07 03 FF
    X07 03 FF
    X43 04 8F 00 00 04 8E FF FF
    X07 03 FF
    X07 03 FF
    X3E 00 00 01 00 00 7F FF 00
    X07 03 FF
    X07 03 FF
    X3F 00 08 00 00 FF F8 00 00
    X07 03 FF
    X51 00 80 00 00 00 00 00 00
    X52 00 80 00 00 00 00 00 00
    X58 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X59 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X5A 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X5B 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X26 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X30 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X73 00 80 00 00
    X72 00 00 00 00
    X76 00 00 00 00
    X77 00 80 00 00
    X4F 00 00 00 06
    X6A 00 0C CC CC 00 73 33 34
    X27 00 7E F9 26 0F 02 0D B4 00 7E F9 26 00 FD F0 30 0F 82 0B 99
    X28 00 80 16 27 0F 00 AE B6 00 7F 3E B8 00 FF 51 4A 0F 80 AB 21
    X29 00 7D AF 4A 0F 06 42 D8 00 7C 21 A4 00 F9 BD 28 0F 86 2F 11
    X2A 00 7E 6B C7 0F 0A AC 92 00 79 05 94 00 F5 53 6E 0F 88 8E A4
    X2B 00 78 B7 2A 0F 3D CE A6 00 5F CE 7E 00 C2 31 5A 0F A7 7A 57
    X2C 00 7C E1 86 0F 6B 34 A6 00 64 C9 E9 00 94 CB 5A 0F 9E 54 91
    X2D 00 7F 89 00 0F 12 AA DE 00 6F D8 67 00 ED 55 22 0F 90 9E 99
    X2E 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X2F 00 C8 2E 2F 0F 0C 80 4C 00 59 61 42 00 7E D9 90 0F D3 16 B2
    X31 00 7E F9 26 0F 02 0D B4 00 7E F9 26 00 FD F0 30 0F 82 0B 99
    X32 00 80 16 27 0F 00 AE B6 00 7F 3E B8 00 FF 51 4A 0F 80 AB 21
    X33 00 7D AF 4A 0F 06 42 D8 00 7C 21 A4 00 F9 BD 28 0F 86 2F 11
    X34 00 7E 6B C7 0F 0A AC 92 00 79 05 94 00 F5 53 6E 0F 88 8E A4
    X35 00 78 B7 2A 0F 3D CE A6 00 5F CE 7E 00 C2 31 5A 0F A7 7A 57
    X36 00 7C E1 86 0F 6B 34 A6 00 64 C9 E9 00 94 CB 5A 0F 9E 54 91
    X37 00 7F 89 00 0F 12 AA DE 00 6F D8 67 00 ED 55 22 0F 90 9E 99
    X38 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    X39 00 C8 2E 2F 0F 0C 80 4C 00 59 61 42 00 7E D9 90 0F D3 16 B2
    X07 03 FF

    Thanks again,

    Dalibor

  • 0 in reply to DALIBOR KRSMANOVIC
    Prodigy 100 points
    Hi Diego,
    I am working with Dalibor on this.we have changed the PWM mode to Ternary and the power intake reduced.But still we are facing the noise issue.We are getting a noise output even if we did not give any input.This humming noise is there always with the same magnitude with sound also.We are using the same configuration as Dalibor posted in the above comment.We have tried to change the LC filter value but still remains same.Could please suggest some solution for this.

    Thanks in advance,
    Safeer.
  • 0 in reply to Safeer KT
    Genius 3295 points
    What is the frequency of the humming noise? 120Hz. perhaps? Knowing this would help identify where the noise is coming from.

    Mike T.