[mcnugget]

Real world effects of parasitics are underated. Found out the hard way that there's a whole lot of pain involved with hot plugging a battery into a board when there's a modular switch mode power supply onboard. Oh, you have a low esr ceramic cap on the input? Lol, the parasitic inductances of your wire and traces have formed a tank circuit and pushed the input voltage well above the unhappy voltage of something. K, you fixed that part, nope, lol, your inrush current is actually 15A because you had 68uF on the output of the smps and somehow you burnt out the internal fet of the smps module. Goddam nearly flipped a table.

[cushychicken]

Inrush is a real bitch. I make it a rule to include simple inrush current control circuits whenever I do DC input that sinks more power than, say, a USB cable.

Lotsa surprise inductances out there. I've felt your pain re: inductance + input cap creating a resonant tank, too. That's a nasty surprise when you manage to create that resonance with your wiring.

[mcnugget]

The worst is when the other guys think you're crazy because they're not suffering the same problems because either the smps they have had a soft start or they overspeced the living crap out of their input stage. I gave up and just spend the 5$ for the IC that provides slew rate control, single IC with a single fet? Oh hell yeah.