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Class D Switching Power Amplifiers and Power D/A conversion

TI TPA3255EVM
TI TPA3255EVM
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Old 20th July 2018, 05:31 AM   #811
DPH is offline DPH  United States
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Join Date: Dec 2008
Location: Portland, OR
Looks fine to me. FWIW the LRS350-48 also is dual voltage with a switch on the side. That said, it's not self contained like this unit.

The stepped voltage levels is not a feature you'll want/need, but no harm leaving it at full voltage.
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Happy DIYing, Daniel
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Old 20th July 2018, 06:29 AM   #812
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
sorry to ask nooby question

in the TPA3251 dataheet /chapter 7.5 its written a gain of 20dB.

i measured with differential probe on the outputs 23 Vpp. input is 400mVrms.
psu 31V.

so 0,4vrms = > Upp= 2,828 *Urms = 2,828 *0,4 = 1,1313 Vpp

formula:
gain = 20 * log (Vou/Vin)... 20*log(23/1,1313) ......i got 26,1 dB

what did i wrong???
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Old 20th July 2018, 11:58 AM   #813
mboxler is offline mboxler  United States
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Join Date: Nov 2011
The 20 db gain is per amplifier (each of the four). If you run speaker outs BTL you double the voltage, which equates to a 6 db increase.
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Old 20th July 2018, 01:13 PM   #814
chermann is offline chermann  Austria
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Join Date: Jan 2017
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ymmd... oohh...yes...thank you!
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