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Nikhil

Wed Feb 04 2009, 08:26AM

Registered Member #1751 Joined: Fri Oct 10 2008, 03:16PM
Location: India
Posts: 16

Hi. I've spent quite some time looking for some audio amp ICs, guess its time to seek some help. Well, i'm on the search for good powerful ICs (>60W). Gone through lots of TDA & LM stuffs but most of em are <50W, cant find nythng higher. Plz help me out with some REALLY powerful ICs !!
Btw, im also in need for an ic capable of pushing 1.5W into 70ohm.
How can i modify the chip amp ckt for different applications such as a sub woofer or tweeter?
THANKS IN ADVANCE

101111

Wed Feb 04 2009, 09:16AM

Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263

LM3886, LM3875 and LM4780.

For the last task maybe a LM356?

Proud Mary

Wed Feb 04 2009, 10:04AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

TDA7295S
80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIGH OPERATING VOLTAGE RANGE
(Â±38V)
DMOS POWER STAGE
HIGH OUTPUT POWER (80W@ THD = 10%,
MUSIC POWER)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
CLIP DETECTOR
MODULARITY (MORE DEVICES CAN BE
EASILY CONNECTED IN PARALLEL TO
DRIVE VERY LOW IMPEDANCES)

DESCRIPTION
The TDA7295S is a monolithic integrated circuit
in Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Topclass
TV). Thanks to the wide voltage range and
to the high out current capability it is able to supply
the highest power into both 4W and 8W loads.
The built in muting function with turn on delay
simplifies the remote operation avoiding switching
on-off noises.
Parallel mode is made possible by connecting
more device through of pin11. High output power
can be delivered to very low impedance loads, so
optimizing the thermal dissipation of the system.

Dr. Dark Current

Wed Feb 04 2009, 10:29AM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

"STK" amplifier modules?

KLH

Wed Feb 04 2009, 02:55PM

Registered Member #1819 Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137

101111 wrote ...

LM3886, LM3875 and LM4780.

For the last task maybe a LM356?

The LM3886 is good; it can supply 68W of power.

For the small amp, you can use a LM356, like 101111, said, but there are also other chips such as the LM386 (OLD) and the TDA2822 (still old, but I don't think it's as old as the LM386). The TDA2822 can be operated in bridge mode for more power since it has two amps in one DIP-8 case (nice).

Proud Mary

Wed Feb 04 2009, 03:31PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Here is another audio power amp IC, this one claiming 100W "music power" - a term more more due to audio consumer marketing than to science. What does it mean? Looking further into the data sheet, we find that the RMS power is just 60W, a cautionary tale about data sheets.

TDA7294
100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIGH OPERATING VOLTAGE RANGE
(Â±40V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 100W MUSIC
POWER)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
NO BOUCHEROT CELLS
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN

DESCRIPTION
The TDA7294 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Topclass
TV). Thanks to the wide voltage range and
to the high out current capability it is able to supply
the highest power into both 4W and 8W loads
even in presence of poor supply regulation, with
high Supply Voltage Rejection.
The built in muting function with turn on delay
simplifies the remote oper

Nikhil

Wed Feb 04 2009, 04:13PM

Registered Member #1751 Joined: Fri Oct 10 2008, 03:16PM
Location: India
Posts: 16

Excellent, but just out of curiosity, are these the most powerful ones, are there better ones? Can these be configured somehow to operate at higher powers? Though i dont have any experience with this one, I suppose the LA47536 operates at 120W+.

Proud Mary

Wed Feb 04 2009, 05:15PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Nikhil, I think it would be simpler and cheaper to make a MOSFET amplifier if you want to have power much greater than this.

You will understand that these power amp ICs are made for low cost production of mass market consumer stereo systems, where powers much greater than 100W are not required.

Outside the consumer hi-fi stereo market, there is little demand for a monolithic audio power amp IC of the kind you seem to have in mind.

What is to be done? Others more able at solid state design than me may have better suggestions, but if I was in your position I think I might use a cheap audio power amp IC of the sort we have been talking about to drive a high-power MOSFET output stage, which need not be either complicated or expensive.

Hazmatt_(The Underdog)

Thu Feb 05 2009, 07:43PM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

I have most of the DIY audio amp books, including the two by Slone and so far his first project doesn't really work that well. Not only that but you have to have some equipment to tweak-in the amp when you build it from components, and the expense far outweighs anything you can consider at the moment.
Ordinarily, getting a current mirror to work properly is no concern, but when you are trying to guarantee a clean output to the voltage amplifier stage and gain, its more like an experiment then anything else.

1. Don't bother with discrete unless you need bandwidths greater then 30KHz.

2. If you're prepaired to waste a lot of time debugging something someone else designed... maybe wrong.

3. If you really understand component selection ( I still have trouble with this)

4. If you have equipment to tweak it in

5. I have a little push pull class B amp here with 100W transistors that can only push 20W at the moment, and I expect it will be a lot of work to get it to output more.

So consider the time spent vs. the money spent, spending the money may be saving you a lot.

Wolfram

Thu Feb 05 2009, 08:32PM

Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971

You can look here for some inspiration:

Anders M.

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