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TPA3123D2 - 25-W STEREO CLASS-D AUDIO POWER AMPLIFIER

Ryan Walker1
Prodigy 20 points


I have a question regarding the build of this device in the datasheet (see first page)....

http://www.ti.com/lit/ds/slos541c/slos541c.pdf

I've been loosely following that build, calculating component values etc... My question is in regards to the 470uF cap used to form a HPF with the speakers coil. In the schematic they don't have the polarity marked, so I'm assuming it's a non-electrolytic cap, a ceramic cap this high capacitance tend to get quite large.

Can I get away with an electrolytic?

  • 0
    TI__Guru**** 189401 points

    Hi, Ryan,

    Thanks for your post, and your interest in our products.

    The drawing of the electrolytic capacitor tells you the polarity. We left off the "+" on the cap as it's generally assumed - see this article for more information.

    The EVM Users Guide lists the part number of the cap that we used. You can find that here.

    The output of the amp nominally sits at VCC/2, so the output of the amp is connected to the positive side of the electrolytic cap.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 20 points

    Thanks Don,

    I was taught a little different, although I don't doubt your methods, some teachers can be stubborn.

    Since you said the output is sitting at Vcc/2, assuming you're using Vcc = 25V, would the system be okay with 16V caps?