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TPS62132 Audible Noise at power up

Mike Edmans15
Prodigy 60 points
Other Parts Discussed in Thread: TPS62132

I have designed a 3.3V DC-DC converter using the TPS62132 to drive an ARM Processor / display board. The maximum current in worst case condition should be 2A, but I have designed the DC-DC converter to be capable of supplying 3A. The board has been carefully designed as recommended in the application notes and data-sheets. I have tested the board with a static load and it works as expected. When tested using the processor board, there is an audible noise for a second or so during the processor board power up sequence. The board draws a peak current of 0.85A with a 6V supply, so the output current should be well below the maximum current. Can anyone suggest what might be causing the noise? To me it indicates that a component must be under some stress. 

  • 0
    TI__Guru**** 150930 points
    Welcome to the E2E forums. In order to give the best support, please read the guidelines post at the very top of the forum. It is important to begin the post with the part number you are asking about. I have edited yours appropriately.

    Audible noise can mean different things. There are many possible root causes, but many relate to signals appearing in the audible band (< 20kHz). You will need to look at some waveforms of your circuit to get a better idea of what could be the cause. I suggest monitoring Vin, Vout, SW, and the inductor current with a scope during power up when it makes the noise.

    Of course, you should also check that the processor board itself is not making the noise.