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Old 16th April 2010, 05:37 PM   #1
trzn is offline trzn  Lithuania
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Default 0.5-1.5W mono chip amp

Hi,
I am looking for 12V mono chip amp. I am beginner, so I want something relatively simple. At the moment I am choosing between LM380, TDA7231, BA820M and OPA134. The last one is the most expensive and LM380 is the most popular among them.
Which one would provide the least background noise and which one would be the most energy efficient?
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Old 16th April 2010, 07:53 PM   #2
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http://www.sure-electronics.net/rf,audio/AA-AB008.pdf
6 bucks for 2 on ebay


2 watt at 5v, you could use a low noise 5v regulator to give it the 500ma it needs for peak output.


If you monkey around with the mini3 design you can get some really low distortion numbers


The Minił Portable Stereo Headphone Amplifier

http://www.analog.com/static/importe...ets/AD8397.pdf

12vdc 310ma = 3.72 watt


As for your choices the LM380 is fixed gain of like 30, so if you fart on the input wire you will max it out. Id look at the LM4954


http://www.national.com/pf/LM/LM4954.html#Overview

It would need a regulator as well since it tops out at 9vdc in. But at least you can set the gain so your 2v rca signal is only upped to 5x instead of 30-50

Last edited by nightanole; 16th April 2010 at 08:03 PM.
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Old 17th April 2010, 04:57 PM   #3
Minion is offline Minion  Canada
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The TDA2003 will give you about 6w with a 12v DC supply and they are about 50 cents a piece and only need a few external components ....


http://www.datasheetcatalog.org/data...cs/mXutuqt.pdf
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Old 18th April 2010, 08:40 AM   #4
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Quote:
Originally Posted by trzn View Post
LM380, TDA7231, BA820M and OPA134.
Is that a list of available ICs where you live or do you also want advice on others?
Cancel the OPA134 from your list, because it is an opamp which will not give you the desired output. I assume the BA820 the same as TBA820.

If low noise is your main concern the other three are pretty similar as are most older ICs in that power range. You usually get 2..3 µV of input noise there. Lower noise is available from newer designs. That usually means SMD as in nightanole's proposals, so maybe not the best choice for a beginner. Newer designs in that power range are also usually class D and work form low supply voltages of 3..6 V, e. g. the LM48xx series.
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Old 18th April 2010, 08:57 PM   #5
johnr66 is offline johnr66  United States
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TDA7267A 16 pin DIP. Very low part count. Fully complementary output for max output voltage swing without extra parts. Fixed gain and no boucherot cell needed. Saves about 3 or four extra parts that an older design would require to match its performance. The old LM380 can never match its output power at a given supply voltage. I bought several chip amps from DigiKey to tinker with and the 7267A is my favorite of the 3 watt and under class.

One side of the chip has all pins as ground for easy heat sinking.
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Old 19th April 2010, 10:36 AM   #6
trzn is offline trzn  Lithuania
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Ok, I found what I believe is the perfect chip for my needs - it is TDA7052A.
I will build amp according to the scheme in the datasheet. I have chosen these components from Mouser:
75-TVA1300-E3, Aluminum Electrolytic Capacitors - Leaded 50V 1.0 uF
75-MKT1813447064, Polyester Film Capacitors 0.47uF 63volts 5%
871-B37987F5104K, Multilayer Ceramic Capacitors (MLCC) - Leaded 0.1uF 50volts X7R 10%
647-PLF1C271MDO1, Aluminum Organic Polymer Capacitors 16volts 270uF Radial Leaded Poly
652-3386X-1-105LF, Trimmer Resistors - Single Turn 3/8 1Mohms 10% 0.5Watts Square
71-RN55E5001B, Metal Film Resistors 1/10watt 5Kohms .1% 25ppm
771-TDA7052AN, Audio Amplifiers 1W BTL MONO AMP W/VOL CTRL

Is it a good choice? Any recommendations?

I can choose all the components either from Mouser or from DigiKey (not some from one supplier and some from another).
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Old 19th April 2010, 04:27 PM   #7
johnr66 is offline johnr66  United States
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The TDA7052A will work, but only at 6 volts (you said you wanted a 12 volt supply) This 8 pin DIP BTL amp will overheat and shut down or fail if you try to operate with a 12 volt supply. It is too small and there is no provision for heat sinking, so you are pretty much limited to 6 volts.
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Old 19th April 2010, 04:51 PM   #8
trzn is offline trzn  Lithuania
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Datasheet states that positive supply voltage range is between 4.5 and 18V. Does not that mean that it can operate on 12v?

Low Voltage 1W Mono Audio Amplifier Module (TDA7052) (3027) - 7052 (not 7052a, but very similar) and it says "Supply 3 – 15 V at < 300 mA".

Quote:
Originally Posted by johnr66 View Post
The TDA7052A will work, but only at 6 volts (you said you wanted a 12 volt supply) This 8 pin DIP BTL amp will overheat and shut down or fail if you try to operate with a 12 volt supply. It is too small and there is no provision for heat sinking, so you are pretty much limited to 6 volts.
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Old 19th April 2010, 06:11 PM   #9
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Quote:
Originally Posted by trzn View Post
Does not that mean that it can operate on 12v?
Depends on the load impedance and the ambient temperature. There is a calculation example on page 5 in the datasheet with 8 Ohm and 6 V. Double the voltage means four times the heat dissipation which is about three times what the IC can dissipate at 25 °C.
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Old 19th April 2010, 06:28 PM   #10
trzn is offline trzn  Lithuania
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I am lost...
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