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Need help with amplifier
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laejf:
I'm making an amplifier using the TPA3123 class D amplifier IC (http://www.ti.com/lit/ds/symlink/tpa3123d2.pdf) and I'm using it in a bridge tied configuration. The recommended circuit of the TPA3123 (Figure 1) and my circuit (Figure 2) can be seen below. I have used a bit different values in the output filter but those are the recommended values for a 4 Ohm load as seen in the datasheet.

My problem is that when connecting the input I get a very low volume on the output regardless what the gain is set to. But when I tried connecting both of my input channels into LCH and grounding RCH, the volume is normal.

Does anyone have any idea what could cause this?

Thanks


Figure 1: Recommended circuit


Figure2: My circuit
themadhippy:
In bridge mode your using both half's of the amp to make 1 more powerfull amplifier instead of a less powerfull 2 channel amp.If you look at the top circuit the input and outputs are marked as + and - not left and right.
laejf:

--- Quote from: themadhippy on October 25, 2019, 05:08:42 pm ---In bridge mode your using both half's of the amp to make 1 more powerfull amplifier instead of a less powerfull 2 channel amp.If you look at the top circuit the input and outputs are marked as + and - not left and right.

--- End quote ---

I see, then how should I connect my source with a left and right channel?
StillTrying:
I see, then how should I connect my source with a left and right channel?

AFAICT In BTL mode you only have 1 power channel and have to use the +/- (L/R) inputs as 1 differential input channel, = one has to be inverted phase.
laejf:

--- Quote from: StillTrying on October 25, 2019, 05:47:52 pm ---I see, then how should I connect my source with a left and right channel?

AFAICT In BTL mode you only have 1 power channel and have to use the +/- (L/R) inputs as 1 differential input channel, = one has to be inverted phase.

--- End quote ---

What's the go-to way of doing that?
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