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Re: What caps to use with LT317/337 regulators

Posted by Werner (A) on February 18, 2007 at 23:27:07

In Reply to: What caps to use with LT317/337 regulators posted by Frank25 on February 15, 2007 at 09:50:11:

Read my series on regulator noise and impedance at TNT, links below.

317/337s exhibit noise peaking when the output capacitors are undersized. 10uF is likely to be too small, so increase value.

317/337s exhibit impedance peaking when capacitor ESR is too low.

So you want a relatively large cap with a medium ESR, say 47uF or more
with 100mOhms or more.

Also check the regulators' adjust pin bypass caps.

http://www.tnt-audio.com/clinica/regulators_noise2_e.html

http://www.tnt-audio.com/clinica/regulators2_impedance1_e.html

bring back dynamic range

• http://www.tnt-audio.com/clinica/regulators_noise2_e.html   (Open in New Window)

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