What the heck is vDroop?

[LoneWolf121188]

I've seen a few posts about vdroop...what the heck is it?

[Sentential]

vdroop refers to a common occurance where the power levels asked of the FETs and various circuits are over-loaded causing a spike either positive or negitive of the desired voltage normally produced.

In this case the voltage would droop (decrease) from its normal levels. Almost like a plant wilting in the sun. This event is typically seen when a processor is at 100% usage or otherwise heavily stressed.

[four4875]

some PWM ICs have built in things to purposely droop. they sense the current draw across one of the transistors and use that as a reference to control their output. more current, they back off on the voltage for some stupid reason. I like the idea of a properly tuned reverse droop, where it raises the voltage under load. that way you can idel at just what it takes, and as the load increases the voltage goes up to whatever the cpu wants, instead of sitting at a flat line the whole load path. lower idle voltage = lower idle temp, and een some energy conservation too.