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Class D Switching Power Amplifiers and Power D/A conversion

TDA8954 input capacitor
TDA8954 input capacitor
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Old 8th July 2016, 09:14 AM   #1
snowcatmaiden is offline snowcatmaiden  Hong Kong
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Default TDA8954 input capacitor

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Don't know much about class D so follow datasheet schematic to start

I wonder if the input capacitors the four 470nf can be omitted
as I don't like the sound of input coupling capacitors (of coz filtering cap cannot be omitted)

and how would it performs if I connect a 3ohm-2ohm speaker,
while the filtering inductor and capacitor values are set to 4-8ohm?
and other way, 16ohm speaker?

Thank you
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Old 8th July 2016, 09:45 AM   #2
abraxalito is offline abraxalito  United Kingdom
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Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Given this chip sets the inputs to SGND it looks as though the input caps can be omitted but any offset voltage at the input can be expected to be multiplied by the amp gain at the output.

With a lower impedance speaker you run the risk of overcurrent - the current limit is 12A, and depending on supply voltage also overheating. The output filter will be overdamped so you might wish to recalculate the values of the L and C (lower L, higher C). For 16ohms your maximum output power will be significantly limited but you'd need higher L and lower C.
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