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Old 19th March 2009, 02:46 PM   #1
diyAudio Member
Join Date: Mar 2009
Default Help on TDA7560

Hi, I'm new to DIY audio ...
I have a TDA7560 based amp as my 1st project,
I got some problem with it & would be very much grateful if anyone can help me.

TDA7560 datasheet shows

Vcc ------------Operating Supply Voltage------------18 V
Vcc(dc)---------DC Supply Voltage-------------------28 V
So, what's the maximum dc voltage(from a rectifier) I can apply to the ckt??
If it is 28v what's the significance of the max 18v?
(can I get a relation between the two?)

(It is given)
4*50W/4 ohm Max
4*30W/4 ohm @ 14.4V,1khz,10%
Is the above mentioned 14.4V Vcc or Vcc(dc)??

I need to power a pair of fullrange speaker of 40W nominal each,
so, what should be the ideal power of the amp & the i/p dc volt to the ckt??
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Old 19th March 2009, 04:11 PM   #2
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Join Date: May 2008
You should design the power supply for a maximum of 18 V nominal. 28 V is the no-load voltage your power supply should not surpass, i. e. (nominal transformer voltage + mains fluctuation + transformer regulation) * 1,41.

The 14,4 V would be Vcc.

There is no ideal voltage, as long as you remain within the specified range. A 12 V transformer with 15 A or more should be just right to remain below the 28 V limit unloaded and bring you into the specified 13,2 to 14,4 V range when loaded.
If you've always done it like that, then it's probably wrong. (Henry Ford)
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Old 20th March 2009, 12:18 PM   #3
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Join Date: Aug 2008
This chip is designed for single supply (eg, automotive audio). There are much better chips for a pair of speakers if you plan on using them in a non-mobile environment.

Also, the datasheet you linked to is incorrect. The correct link would be:

According to the datasheet, it can handle 8V p-p input, although there is no more info on whether that is the level required to get maximum output.
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Old 20th March 2009, 12:31 PM   #4
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Join Date: Mar 2009
............Thank you very much Pacificblue.
...........would it be unsafe if I apply more than 12v dc,maybe 14 or 15v??
what's the max i/p I can apply for 40w (/4ohm) nominal rating fullrange speakers (with PMPO 320w) with this TDA7560 amp??
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Old 20th March 2009, 03:01 PM   #5
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Join Date: Aug 2008
You can definitely use 14 or 15V. As pacificblue said, a 12V transformer would be possible, as loaded output would be about 16V. Unloaded, it would probably be about 18V, so that's probably as high as you would want to go.

Looking at the output power vs supply voltage graph, at 16V supply, max output into 4ohm speakers is 60W. You might assume (since they don't tell you) that that output is for 8V input. So to get 40W, you would need an input of about 5.3V.
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Old 20th March 2009, 03:44 PM   #6
mjf is offline mjf  Austria
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Location: Austria
the data sheet says you can get round about 23watt(at 1%distortion) with 4ohm speakers and 14,4v(dc) supplyvoltage with this poweramp.
the voltage gain is internally fixed to 26db (=20 times,e.g. 1v input gives you 20v output).
the input caps (100nf) are a little bit small,for more bass you can use 220nf or 470nf as you like.................
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Old 20th March 2009, 04:44 PM   #7
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Thanks Redshift..

the tda7560 is designed to have supply from a car battery(about 12v dc)......... if I use a 12v transformer, on rectification the o/p should be (12*2/pi=) 7.64v dc ...........or am I wrong??

.........did u say about other chips better than tda7560 for non-mobile use??
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Old 20th March 2009, 04:55 PM   #8
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
search this section of the Forum for 1875, 3875, 3876, 3886, 4765, 4766, 4780 and all the others from other than National.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 22nd March 2009, 10:27 PM   #9
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Join Date: Aug 2008
No you multiply by about 1.4 to convert from AC to DC. So 12V AC gives about 16V DC.

For non mobile use, the LM1875, LM3875 and LM3886 are very popular for easy to build, wonderful sounding amps.
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Old 27th March 2009, 07:21 AM   #10
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Datasheet says this TDA7560 chip gives 50w/ch for 4ohm speakers
Is it RMS or peak power???
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