First thing to do is get a scope and start probing around. If you're measuring with a meter, it wont show the peak voltage.
I recently debugged a nasty switching-regulator problem in my wristwatch, only to discover the bench supply *plus the inductance of the testleads* I was using had tons of noise, so check all around the switching regulator as well. Also be aware the feedback path to the regulator has a low-pass filter with a cutoff frequency around 160Hz (assuming I did my math correctly for Fc=1/2pi*R2*C2. You can ignore R1 because R1>>R2). That will definitely limit the response-time of the regulator. As you increase the load current, the converter will need to respond faster to replenish the output voltage (hint: I=Cdv/dt ). Your measurements clearly show the output voltage dropping at higher load current, so that's a definite clue. Also, if you can run simulations that will help a lot. LT Spice (Linear Technology) is a great tool; I dont know if they have a competing part for the Max1771 (Maxim ?), or if Maxim has a similar tool. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/b0f5c951-082e-4ce9-bf94-105d11c4d448%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
