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TPA6203A1 eval board (EVM)

Sal LaRussa
Genius 10040 points
Other Parts Discussed in Thread: TPA6203A1

Hi,

Can someone explain how the DC bias is set on the inputs (In + and In -) of the TPA6203A1 on the EVM?    It seems like they will drift to an arbitrary DC level unless you add a pull up or pull down.

  • 0
    TI__Guru**** 189401 points

    Hi, SJL,

    Sorry, this is not shown in the d/s, but the inputs are internally biased at VDD/2.

    If you measure at the chip side of the input blocking caps, you should measure VDD/2. If not, then there is some kind of problem on the board, maybe some stray path to ground (dirt, metal shavings, etc), a bad cap, or a resistor in place of an input blocking cap.

    -d2