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Old 18th April 2012, 08:05 AM   #1
epilot is offline epilot  United States
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Default 80-90W power

Hello guys,

Sorry but I have got a question.

Is there any single power op-amp capable of delivering more than 80-90 watts other than LM3886 which is able to deliver just 67W?

The other question is how can i improve the Slew rate of the LM3886 at say 25Vp and the frequency of say 50Khz please?

Thanks
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Old 18th April 2012, 01:58 PM   #2
Puffin is offline Puffin  United Kingdom
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Bridge or Bridged/Parallel?
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Old 18th April 2012, 03:43 PM   #3
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Quote:
Originally Posted by Puffin View Post
Bridge or Bridged/Parallel?
I think "single" excludes bridge and parallel!

I don't think that there are any currently manufactured chipamps that can deliver 90W without seriously pushing the limits of the device (heat dissipation, max rail voltage, etc.). There are some old SANYO STK chip amps that are capable of over 100W (e.g. 150W) but these are difficult to find and only a few models have relatively low distortion (many are spec's up to 0.4% - I would avoid these).

That's about it.

You can get amplifier modules that easily beat that spec, but they are not chipamps. For instance class D amps can offer up to 600W @ 8 ohms (or more!).

-Charlie
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Old 18th April 2012, 04:01 PM   #4
pra3718 is offline pra3718  India
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As per datasheet tda7294 deliver 100w
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Old 18th April 2012, 07:51 PM   #5
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by pra3718 View Post
As per datasheet tda7294 deliver 100w
@ 10% distortion with supply rails @ +-35Vdc, while delivering full power and the chip still operating in Ta=25C
__________________
regards Andrew T.
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Old 18th April 2012, 08:19 PM   #6
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Quote:
Originally Posted by pra3718 View Post
As per datasheet tda7294 deliver 100w
As usual, you need to know the details before quoting one of the ludicrous specs like this. As the above post mentions, this is at an extremely unacceptably level of distortion. If you actually read the datasheet past the first page, you can see it quotes 60-70W into 8/6/4 ohms below 0.1% distortion.

-Charlie
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Old 19th April 2012, 10:14 AM   #7
epilot is offline epilot  United States
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Thanks for all inputs,

honestly I am looking for power OP-AMPs not power amplifiers so that could play with them at 50 to 60KHz...

Class D is a good choice but it can not reach to such a frequency which I need
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