Need Help with Power Supply for TDA7294 Chip Amp

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T

ToFa

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Joined 2015
hi, im a Student.
Im building stereo amp with two TDA7294.
This Chip Amp will deliver 70W RMS @ +/-35Vdc. and maximum 100W @ +/-50Vdc. Its Output Peak Current is 10A. Look up those images. theres all information u may need :)
And I attached a PS design. can i use that for this Chip Amp??
that was for TDA2050 +/-25Vdc. TDA2050 Output Peak Current is 5A. they used a Trafo of 18-0-18Vdc @ 160VA (4.4A) that was also stereo. two Chips were there..
if i can use that design then tell me Trafo, caps and resistors details for +/-35Vdc :)
i guess i will need a 25-0-25Vdc Trafo!!!! :D (no idea about current rate :( )
i also attached a pic of +/-25Vdc PS parts details... :)

Thanks in Advanced :D
 

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D

DPH

Member
Joined 2008
Obviously your chip will only be able to swing between (roughly!) +22 to -22 Volts with that transformer, which, for most everything, is just fine. It also relaxes your heatsinking needs.

If you're going to buy a new transformer, something in the 22-25V range would do well. 10,000 uF capacitors aren't terribly expensive, so make for a decent sweet spot. If you look for Tom Christiansen's (sp?) notes on LM3886 local decoupling, you would do well to get something like a 4.7uF x7s/x7r 100V as close to the power pins as possible:

FK11X7S2A475K TDK | Mouser
 
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