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Old 13th May 2012, 10:15 AM   #1
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Default I'm designing a TPA6120 based headphone amp, is there anyone can give me some advice

I'm designing a high-fadely headphone amplifier based on TPA6120, is there anyone can give me some advice?

Here is the schematic I designed.
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Old 13th May 2012, 04:16 PM   #2
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The TPA6120 has high input bias...you might consider an input buffer.
Don't forget to design your board to use the thermal pad on the underside
of the chip.
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Old 14th May 2012, 03:50 AM   #3
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Quote:
Originally Posted by Avro Arrow View Post
The TPA6120 has high input bias...you might consider an input buffer.
Don't forget to design your board to use the thermal pad on the underside
of the chip.
Thank for your advice.
I'm designing input buffer now.
And for thermal pad, yeah, i drew it when I drew TPA6120A2 footprint(except nearby feedback components).
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Old 14th May 2012, 05:33 PM   #4
jcx is offline jcx  United States
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you might look at Peranders TPA6120 project for ideas, pwr pad soldering hints

rather than a independent buffer op amp in front I much prefer a Multiloop topology where a good quality "audio" op amp applies global feedback around the TPA6120 - this improves the performance of both amps in the composite

Walt Jung has written about these multiloop composite amps for audio line driving, check his site, his "Op Amp Applications" book (online at Analog.com)
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Old 17th May 2012, 03:07 AM   #5
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Originally Posted by jcx View Post
you might look at Peranders TPA6120 project for ideas, pwr pad soldering hints

rather than a independent buffer op amp in front I much prefer a Multiloop topology where a good quality "audio" op amp applies global feedback around the TPA6120 - this improves the performance of both amps in the composite

Walt Jung has written about these multiloop composite amps for audio line driving, check his site, his "Op Amp Applications" book (online at Analog.com)
Thanks for your advice.
I'm interesting of Peranders TPA6120 project.
Could you please provide me some information about it?
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Old 17th May 2012, 04:19 AM   #6
jcx is offline jcx  United States
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should be enough keywords in my post for search to work

Google

QRV07 Headphone amp




Walt Jung articles, multiloop "audio line drivers" 2nd half of page:

http://waltjung.org/Classic_Articles.html
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Old 23rd May 2012, 07:57 PM   #7
hyperma is offline hyperma  China
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This chip was designed to be a line driver,so it's quick and powerful,on the other hand,take care of the PCB designing,chip capacitors and resistors are strongly recognized.
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Old 1st June 2012, 08:03 PM   #8
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Quote:
Originally Posted by Avro Arrow View Post
The TPA6120 has high input bias...you might consider an input buffer.
Don't forget to design your board to use the thermal pad on the underside
of the chip.
The bias is max 12 uA! Compare the data sheet THS6012, the same chip. 5 kohm feedback may not be good. This is a current feedback amp and the feedback value is very sensitive.
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Old 2nd June 2012, 01:52 PM   #9
jcx is offline jcx  United States
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5 kOhm is "over-compensation" - since the current feedback op amp feedback R value ~ determines (inverse) GBW, this higher value slows down the amp, may make it easier to stabilize

12 uA could be too big a input current for noiseless, long life for volume pot wiper, OK if driven from a lower Z source

Last edited by jcx; 2nd June 2012 at 02:06 PM.
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Old 4th June 2012, 11:21 PM   #10
JustFJ is offline JustFJ  United States
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hi,
i tried this TPA6120 with protoboard and sounds amazing
tpa6120my1.jpg
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