the TAS5558 chip is so hot

marcoyin

Other Parts Discussed in Thread: TAS5558

TAS5558 has been able to play music via USB or Bluetooth, but the TAS5558 chip is so hot that I can’t touch it with my hands. Is there a problem with my design? Help me see the circuit.

over 3 years ago

0 Alix Wan over 3 years ago

TI__Genius 9995 points

Hi Marco,

As this is pwm modulator that should not be so hot. Do you find this issue in TI EVM board or just your own board?

Need to check your thermal design with your PCB. By the way, is your function right?

Br,

Alix Wan.

0 Matthew Miao over 3 years ago

TI__Expert 6720 points

Hi Marco,

As for the schematic, it's suggested to short pin 32 TEST to GND, and Pin 29 is missed even it's float.

BTW, please confirm the TAS5558 functions are working in your side, and thermal pad is well soldered to PCB board.

Regards

0 marcoyin over 3 years ago in reply to Alix Wan

Prodigy 110 points

Yes, tas5558 can play normally. It works on my pcb.

0 marcoyin over 3 years ago in reply to Matthew Miao

Prodigy 110 points

Yes, I noticed that the 29pin is missing, but there is 29pin on the PCB, which is correct. Thank you

0 Sam(MPAA) Zhang over 3 years ago in reply to marcoyin

TI__Mastermind 19080 points

Hi Marco,

I assume you are using the same 3.3V to power the different supplies of the TAS5558, could you please check the input current on the 3.3V rail?

Let's check if the power dissipation is normal.

BTW, does the exposed thermal pad under the package well soldered on the PCB board?

Thanks!

Regards,

Sam

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the TAS5558 chip is so hot