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Old 20th September 2012, 06:01 PM   #1
Kitax is offline Kitax  Latvia
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Default selecting a chip

so i am new here, and i would like some help on my little project... i want to make a boom box, powered by a 12 volt battery, and i would like a 25-50 watts of power to the speakers... can anyone help me find a chip, that would not be hard to find?

also a schematic of application would be nice
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Old 20th September 2012, 06:39 PM   #2
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tda8560 , 40 watt into 2 ohm. stereo.
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Old 21st September 2012, 04:17 PM   #3
kmibb is offline kmibb  United States
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DIY Chip Amplifier Kits, PCB's, Components and Information.
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Old 21st September 2012, 08:19 PM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Arty View Post
tda8560 , 40 watt into 2 ohm. stereo.
needs >12Vpk into the load.
Is this a bridged output?
What supply rail voltage does the manufacturer use to arrive @ 40W into 2r0?
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Old 21st September 2012, 11:04 PM   #5
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14.4 V rail, it is Btl, 2 ohm, and 10% distorsion.
And has absolute maximum of 18V operating rail.
16 volt is okay as rail voltage.
9v swing from 14.4 v rails is possible.
(9V/2 Ohm = 4,5 A , and 4,5A * 9V = 40,5 W)
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Old 22nd September 2012, 07:27 AM   #6
AndrewT is offline AndrewT  Scotland
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Can you see that you cannot get 12.6Vpk (doubled for bridged) from a 12V battery?

Probably not since you have posted the wrong formula for power.
9V & 4.5A is for continuous non varying DC power.
9Vac & 4.5Aac is for alternating current power.
9Vac is >12.7Vpk, 4.5Aac is >6.3Apk.
The power that results from these values is impossible to get from your chipamp.
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Old 22nd September 2012, 08:54 AM   #7
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the manufacturer does not think so. at 30% distorsion it says something like 50 watts.
btw, the mesurements account 14.4 Dc.
((sqrt2)/2)*9 = 14,1 V.
so.. it should be able to manage that 40 watts into 2 ohm, with 10% distorsion.
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Old 22nd September 2012, 10:13 AM   #8
Kitax is offline Kitax  Latvia
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if i want to make a amp with tda 8560, with 12v psu should i just use the schematic in the datasheet? if no, can you please give me a schematic to use?
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Old 22nd September 2012, 05:23 PM   #9
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datasheet schematic is perfect
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Old 22nd September 2012, 05:35 PM   #10
Kitax is offline Kitax  Latvia
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finnally got the answer ^_^

i was just looking for an approveal thanks
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