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Original question:

TAS5806MD: IC heats up, even without load

TAS5806MD: LC filter inductor effect on power consumption

LucasW
Prodigy 70 points
Part Number: TAS5806MD
Other Parts Discussed in Thread: TAS5806MEVM

Hi,

I designed my circuit according to TAS5806MEVM User's Guide page 7. The LC filter is realized with 4.7uH (Mfr.Pn: TYA40204R7M-10) and 0.68uF. PWM switching frequency is 384kHz and PVDD is 24Volts. When powering up the Amp it draws an idle current (without load) of about 240mA and heats up very quickly to over 90°C case temperature but it is possible to play audio! 

When I set the amp in HiZ-Mode the current draw drops to 37mA. I then changed the filter coil from 4,7uH to 10uH, this seems to fix the Problem. Idle current draw is down to 110mA and the Ic only heats up to 60°C (measured after 10minutes).

Can someone explain this to me? Shouldn't it also work with the smaller Inductors without problems? 

 

  • +1
    TI__Mastermind 34650 points

    Hi 

        The idle current will be affected by the switching frequency, PVDD voltage, and play mode. With higher PVDD voltage and smaller switching frequency, the idle current will be larger and the power loss is higher. It is normal under your working conditions, actually there's very high OC risk when power up.

     

        With the PVDD voltage higher than 12V, we strongly recommend to use the inductor larger than 10uH.

       You can check the chapter 10.1.2 Inductor Selections in the datasheet for more information. Thank you. 

  • 0 in reply to Shadow He
    Prodigy 70 points

    Thank you. I don't know how I could miss that in the Datasheet.