Parsing the Supertex LR8N3 HV regulator - diyAudio
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Old 20th February 2013, 01:30 PM   #1
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Location: Llanddewi Brefi, NJ
Default Parsing the Supertex LR8N3 HV regulator

A long while back someone contacted me regarding the stability of the LR8N3 regulator. I'm going to post some of the results of putting it through its paces.

Last edited by jackinnj; 20th February 2013 at 01:34 PM.
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Old 20th February 2013, 03:00 PM   #2
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I put up the wrong file before: Here's the PSRR with and without bypass (10uF) on the adjust pin:

Click the image to open in full size.

and a bode plot. Solid red line is adj pin bypassed with 10u. At the zero gain crossing there appears to be 57 deg phase margin:

Click the image to open in full size.
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Old 9th October 2013, 01:22 PM   #3
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The Bode plot is what, from the unregulated HV input to the output? From the ADJ-pin network ground pin to the output?

Given that so many folks add outboard pass transistors to the LR8, using it merely as a control element, what would be the best LR8 Bode plot info to use in analyzing the loop stability and output-impedance reactive properties in that situation?

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