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Old 6th February 2013, 03:53 AM   #1
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Default Very simple power amp

Over in Sci.Electronics.Design George Herold started a thread called
"A new opamp's here, a new opamp's here!" with a link to the following.

http://cds.linear.com/docs/en/datasheet/6090fa.pdf

You may want to check page 19 of the datasheet where they show a simple 100 Watt power amplifier. It looks to me like the feedback network values are wrong but it would be easy to correct.

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Old 6th February 2013, 09:12 AM   #2
djk is offline djk
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19V/µS seems kind of slow for a ±70V amplifier.
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Old 6th February 2013, 09:32 AM   #3
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Could be improved in swing and linearity by boostrapping the 100K's
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Old 6th February 2013, 09:21 PM   #4
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10 ma max specified drive current, SOT or TSSOP package, heat sink on the bottom instead of a pad. Requires a LT1166 to make an audio amp, or two 2sk1057 and two 2sj1161 FET's for the 100 w version. Looks like it is useful only for big boys with a wave soldering machine. The existing TI/NatSemi LME49830 is a FET audio amp driver with a big heat tab an amateur can screw to a real metal heat sink.
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Old 6th February 2013, 10:22 PM   #5
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Umm,

With magnifying goggles and thin solder you can do SOT easily.

With a fine soldering iron tip, thin solder, and liquid flux, TSSOP is doable.

With a bigger soldering iron tip you can solder the power pad to the board from the bottom.

...Wave soldering is for through hole pcb's, not SMT

Just thought I'd clear that up.

But I agree that you can't do point to point on TSSOP and with SOT it would look ridiculous.

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Old 6th February 2013, 10:47 PM   #6
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Quote:
Originally Posted by DUG View Post
Umm,

With magnifying goggles and thin solder you can do SOT easily.

With a fine soldering iron tip, thin solder, and liquid flux, TSSOP is doable.

With a bigger soldering iron tip you can solder the power pad to the board from the bottom.

...Wave soldering is for through hole pcb's, not SMT

Just thought I'd clear that up.

But I agree that you can't do point to point on TSSOP and with SOT it would look ridiculous.

Gadgets like these can simplify the problem.

SO14 to 14-pin DIP Adapter (p/n 050101) | MonsterMarketplace.com

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Old 7th February 2013, 12:41 AM   #7
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Not the greatest choice for a composite amp control loop; the LTC6090 lacks the GBP to maintain consistent linearity across the audio band and the resulting lack of Avol shows in the THD+N plot. The
USE SEVERAL SERIES RESISTORS TO REDUCE DISTORTION (i.e. 5 × 2k).
note on page 17 (first post in this thread has a typo) of the LTC6090 datasheet is kind of entertaining, though. At 35V RMS (the amplifier's maximum output) the 10k feedback resistor would dissipate 245mW. Enough I suppose some thermal spreading would be useful.
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