problem with tda8954th

shahpoori

Member
2016-04-22 7:50 pm
hi friends
i made a pcb for tda 8954th according to datasheet ,the sound there is , but the coils and IC very quickly be hot!
even there is not any input signal! why?
for 3-6 ohm speakers should be 15uh coils and 680nf capacitor (series to gather to ground)
vcc & vss is +-40 volts.
[IMGDEAD]http://s3.img7.ir/om0r7.jpg[/IMGDEAD]
[IMGDEAD]http://s3.img7.ir/TX2Gk.jpg[/IMGDEAD]
[IMGDEAD]http://s3.img7.ir/OeTo4.jpg[/IMGDEAD]
 
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shahpoori

Member
2016-04-22 7:50 pm
one important not is:for -+40 volt supply the inductance that mentioned at the datasheet is wrong!it should be about 50uh not 15-22! if use inductance below 40uh that will be very hot!
i winding that myself with 0.75mm diameter wire @ 55 turns .
 
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