TDA7560 Questions from newbeginner - diyAudio
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Old 6th August 2012, 11:53 AM   #1
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Default TDA7560 Questions from newbeginner

Hello

If i want to use a 240v to 12 or 15 DC V transformer to power this chip.

How many Ampere does it need? I cant find that info in the PDF.

There will be more questions soon.

Regards

Fredrik
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Old 6th August 2012, 05:59 PM   #2
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Well that depends on what impedance speakers you will be running it on. if you use only 4 ohm speakers a 150VA transformer will do and if you use two ohms a 300Va this larger transformer will be good for 4 or 2 ohm loads. to stay on the safe side i woud use a 9 volt transformer. after rectification you will get just over 12 volts. you will need some pretty decent size psu smoothing capacitors say 10000uF.
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Old 6th August 2012, 06:30 PM   #3
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halogen lamp toroidal transformators have 11,5 Vac secundary.
Will yield something cloe to 16 16.5 Vdc after rectifier and smoothing.
perfect for the amp.
You can find those, go as madtecchy suggested, 300 Va is what You need.
25V rated filter caps, probably 10000uF might be small if are 4 channels have a load of 2 ohms.
Won't hurt to add a nother of those
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Old 7th August 2012, 09:01 AM   #4
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I suggested a 9 volt transformer so has to make sure that the IC isnt running at max voltage if the mains voltage is high. I was thinking about a regulated psu but at the current needed it will be a bit over the top.. I think this Ic would run ok on a computer PSU plenty of current to be had and cheap .
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Old 7th August 2012, 11:17 AM   #5
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Thanks

Så 150-300VA it is that should be about 12,5-25A?

About Grounding. All ground except signal GND is to be connected to -?

Would it be ok with tantal kondensators for the line in?

Resistors 0,25W metalfilm ok?

Fredrik
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Old 7th August 2012, 05:47 PM   #6
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research star ground schema, and use that.
tantal condensators are not suited for the line in. For input caps, use film type non polarised capacitors.
resistor 0.25w metal film is okay.
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Old 8th August 2012, 11:08 AM   #7
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Thanks I will look into that!

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Old 8th August 2012, 09:28 PM   #8
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allso beware, pc psu has a turn on voltage surge, if the IC is connected (even if its OFF state) it might instantly kill it. (actualy i know from practice that it will...)
if you follow that route, then You need dummy loads to +5 and +12 rails (small lightbulb will do)
and delayed relays to absolute disconnect the IC from the PSU untill the turn on surge decays.
Otherwise it will get overvolted, and end up dead, doing nothing at all.
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Old 9th August 2012, 01:13 PM   #9
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New question.

Isolating the chip from the heatsink!

I have been reading this forum and it seems that I should isolate the chip. What do I use for that. I cant seem to find anything that fits in Swedish webshops.

Fredrik
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Old 9th August 2012, 02:56 PM   #10
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this chip runs on single rail, no need to isolate it.
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