Bode analyser - DC/DC Converter Stability Measurement

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Joined: Fri Jul 03, 2020 1:23 pm

Bode analyser - DC/DC Converter Stability Measurement

Post by trimen » Fri Jul 03, 2020 1:56 pm


I'm trying to do some power supply stability measurement with RP and I can't get satisfying results.

I'm trying to measure a cheap DC/DC converter with LM2596. I basically follow the Bode100 app note. As an injection transformer, I used a 3VA transformer with two separate 9V secondary windings. One is connected to the output of RP (DC resistance ~25Ohm) and another is connected to 10Ohm resistor in the feedback loop. ... y_V3_3.pdf

However, the measurement is somewhat distorted and the output is not expected.
I wasn't able to find more information on this subject with RP integration.
Is it possible to get more information on how to correctly use RP in this case?
Also, the measurement is relatively slow.
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Joined: Tue Nov 17, 2020 8:10 pm

Re: Bode analyser - DC/DC Converter Stability Measurement

Post by fabio944 » Tue Nov 17, 2020 8:44 pm

Hi Trimen,

Did you ever figure this out? I'm looking to get a RP for as the BODE100 is not in the budget and now I'm a bit concerned.

If you haven't figure this out.
What probes are you using? Could you also post a schematic picture with injection point?

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