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Original question:

TAS5825M: TAS5751M amplifier frequency response attenuation is too large

TAS5751M: How can the TAS5751 reach the manual 68W

FOUND HUANG
Prodigy 50 points
Part Number: TAS5751M

Hi, I'm using TAS5751M chip to build an amplifier with 24V supply, BD modulation, PBTL mode, 4 ohm load, and tested the max power 53W,there's no over-temperature or over-current protection, but the power won't go back up.The diagram of power and supply voltage in the manual shows two cases: "2 Layer Continuous Power" and "4 Layer Continuous Power".

1, please ask whether these two kinds of PCB for two-layer board and four-layer board means, whether for four-layer board heat dissipation is better than two-layer board.

2、My board is a four-layer board, all four layers have copper cladding, and my actual situation should belong to "2 Layer Continuous Power", what could be the reason?


  • 0
    TI__Intellectual 1490 points

    Hi Found,

    For question1:

    Yes, four-layer board heat dissipation is better than two-layer board, and the heat dissipation performance influences the max power.

    For question2:

    It seems that your heat dissipation is not really well.

    If your lab has constant temperature test bench, you can verify the max power in constant temperature.

    FOUND HUANG said:
    My board is a four-layer board, all four layers have copper cladding,

    Does heat dissipation go through each ground plane?And if the thermal gnd pad(49 pin) is connected to ground correctly?

     

    Best Regards,

    Donny Peng