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Old 17th February 2010, 10:43 PM   #1
sendler is offline sendler  United States
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Default Minimum gain for Tripath TK2050?

Many Class AB amps lose stability below a certain amount of gain. Is there a minimum gain for the Tripath TC2000/TK2050 chip set? I have read through the TK2050 data sheet and find only a formula for optimizing the feedback ratio according to supply voltage but no minimum gain spec. The performance characteristics show only a "typical gain" of 15V/V for 30v supply. No spec for min or max gain. The feedback ratio obviously sets the gain. I'm using 1K and 15K resistors that come in the Sure 2X100 amp which are optimal for 32V and give a gain of 16V/V which just happens to give a perfect input sensitivity for my digital source to run direct in using only a few db of digital volume control at full reference listening levels with my inefficient Usher two ways. I am going to go active with these amps and would like much less gain for the new 100db compression tweeter section than the dipole woofers will need. Can I go down as low as 1K ohms with 9K at 20V for a gain of 10V/V for instance with no stability issues?
http://www.sure-electronics.net/download/TK2050.pdf
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Old 19th February 2010, 02:18 AM   #2
sendler is offline sendler  United States
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I guess I will just have to try it myself and report back.
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Old 22nd December 2011, 09:32 AM   #3
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Hi Scott,

what were the results?

Thanks,
Matthieu
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Old 22nd December 2011, 12:05 PM   #4
sendler is offline sendler  United States
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I didn't do anything with the gain in the output stage yet. It should work fine right down to the minimum allowable voltages. Power will also be reduce though. This is mainly useful for high efficiency horn drivers.
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Old 22nd December 2011, 03:14 PM   #5
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Thanks!
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