Need cheap 40V supply OpAmp with >500mA peak output
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Posted by Robert Latest on December 12, 2006, 9:21 am
Please log in for more thread options Hi folks, for a low-noise floating +/- 15V-supply running off +/- 18V I'm looking for a simple integrated power amplifier that can deliver about 1.5W rms power into the transformer (~15kHz sine). Interestingly there seems to be a "gap" in available amps: There are plenty of cheap 1-2W audio amps running off 5V, and then there are the big 3A L165 and friends (which, at 36V total supply, burns more than 2W quiescent power). Of course I can go discrete; I'm just asking if I'm missing the obvious candidate. Thanks, robert | ||||||||||||||||
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Posted by Winfield Hill on December 12, 2006, 10:09 am
Please log in for more thread options Robert Latest wrote... It's the cheap part that'll get you into trouble. For example, consider the buf634 at $4.12 qty 100 in the miniDIP package, with a low-noise opamp of your choice. Just how cheap do you want it to be? -- Thanks, - Win | ||||||||||||||||
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Posted by Robert Latest on December 12, 2006, 10:58 am
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On 12 Dec 2006 07:09:20 -0800, > Robert Latest wrote...
>>
>> for a low-noise floating +/- 15V-supply running off +/- 18V >> I'm looking for a simple integrated power amplifier that can >> deliver about 1.5W rms power into the transformer (~15kHz >> sine). Interestingly there seems to be a "gap" in available >> amps: There are plenty of cheap 1-2W audio amps running off 5V, >> and then there are the big 3A L165 and friends (which, at 36V >> total supply, burns more than 2W quiescent power). >> >> Of course I can go discrete; I'm just asking if I'm missing >> the obvious candidate. >
> It's the cheap part that'll get you into trouble. For example, > consider the buf634 at $4.12 qty 100 in the miniDIP package, > with a low-noise opamp of your choice. Just how cheap do > you want it to be? Well, ON Semi's TCA0372 fits the bill nicely for .95 at DigiKey. Except that DK is a bit difficult to order from if you're in Europe and you're ordering for a government agency (lots of red tape and steep shipping fee because of overseas order). I've added the chip to my continuously growing "DigiKey-Only" list which hasn't yet reached the threshold at which I think placing an order is justified. robert | ||||||||||||||||
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Posted by Winfield Hill on December 12, 2006, 12:33 pm
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Robert Latest wrote... > Winfield Hill wrote
>> Robert Latest wrote...
>>>
>>> for a low-noise floating +/- 15V-supply running off +/- 18V >>> I'm looking for a simple integrated power amplifier that can >>> deliver about 1.5W rms power into the transformer (~15kHz >>> sine). Interestingly there seems to be a "gap" in available >>> amps: There are plenty of cheap 1-2W audio amps running off 5V, >>> and then there are the big 3A L165 and friends (which, at 36V >>> total supply, burns more than 2W quiescent power). >>> >>> Of course I can go discrete; I'm just asking if I'm missing >>> the obvious candidate. >>
>> It's the cheap part that'll get you into trouble. For example, >> consider the buf634 at $4.12 qty 100 in the miniDIP package, >> with a low-noise opamp of your choice. Just how cheap do >> you want it to be? >
> Well, ON Semi's TCA0372 fits the bill nicely for .95 at DigiKey. > Except that DK is a bit difficult to order from if you're in > Europe and you're ordering for a government agency (lots of red > tape and steep shipping fee because of overseas order). I've added > the chip to my continuously growing "DigiKey-Only" list which > hasn't yet reached the threshold at which I think placing an > order is justified. Farnell doesn't have it? -- Thanks, - Win | ||||||||||||||||
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Posted by on December 12, 2006, 1:57 pm
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Winfield Hill wrote: > Robert Latest wrote...
> > Winfield Hill wrote
> >> Robert Latest wrote...
> >>> > >>> for a low-noise floating +/- 15V-supply running off +/- 18V > >>> I'm looking for a simple integrated power amplifier that can > >>> deliver about 1.5W rms power into the transformer (~15kHz > >>> sine). Interestingly there seems to be a "gap" in available > >>> amps: There are plenty of cheap 1-2W audio amps running off 5V, > >>> and then there are the big 3A L165 and friends (which, at 36V > >>> total supply, burns more than 2W quiescent power). > >>> > >>> Of course I can go discrete; I'm just asking if I'm missing > >>> the obvious candidate. > >> > >> It's the cheap part that'll get you into trouble. For example, > >> consider the buf634 at $4.12 qty 100 in the miniDIP package, > >> with a low-noise opamp of your choice. Just how cheap do > >> you want it to be? > >
> > Well, ON Semi's TCA0372 fits the bill nicely for .95 at DigiKey. > > Except that DK is a bit difficult to order from if you're in > > Europe and you're ordering for a government agency (lots of red > > tape and steep shipping fee because of overseas order). I've added > > the chip to my continuously growing "DigiKey-Only" list which > > hasn't yet reached the threshold at which I think placing an > > order is justified. >
> Farnell doesn't have it? > > > -- > Thanks, > - Win They say they do but at their US sister company Newark, so it is either pay ~35$ to get it in 3 days or 10$ to get it in 14 days -Lasse | ||||||||||||||||
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> for a low-noise floating +/- 15V-supply running off +/- 18V
> I'm looking for a simple integrated power amplifier that can
> deliver about 1.5W rms power into the transformer (~15kHz
> sine). Interestingly there seems to be a "gap" in available
> amps: There are plenty of cheap 1-2W audio amps running off 5V,
> and then there are the big 3A L165 and friends (which, at 36V
> total supply, burns more than 2W quiescent power).
>
> Of course I can go discrete; I'm just asking if I'm missing
> the obvious candidate.