/diy/ - Do It Yourself

Got a question regarding ripple current after a DC-DC step down converter I want to build:

Using a LM2576 in its typical application (pic related) I'd get a regulated +5V output.

Since I want to use it for measurements, changes in this voltage should be as small as possible and with the LM2576 at max output (3A) I'd get about 50mV output voltage ripple (more when changing the load during runtime, but that's not important for the application), so ~1% variation. I want to reduce this if possible.

The datasheet suggests a small LC filter at the output (20μH and 100μF) to reduce this further by factor 10 (so I'd get 0.1% variation). This might be enough for the application, but I looked online and found this suggestion by EEVblog (ep. 1116) [https://www.youtube.com/watch?v=wopmEyZKnYo] which suggested a capacitance multiplier (also pic related). Alternatively this is mentioned in chapter 8.15.1 of the Art of electronics. Any idea about effectiveness of this compared to the LC filter?