I'm rather confused by the behaviour of an LED here, I wonder if someone can get my head around it?
I have a microcontroller-based circuit @3.3V (using an LM2937 LDO regulator) driving a standard LED (2V ish voltage drop, 20mA If) via a digital output. So far so simple.
When I use my circuit simulator software...if I connect the LED directly to a 3.3V source, with no series resistor, it tells me it would draw 14mA ish. This is ok for the LED and my PIC I decide, and connect it up. Sure enough, when I do so, my ammeter tells me that 10-11mA flows through the LED. Great...no problem, I think to myself.
However, when I connect it to my bench DC power supply @3.3V, it displays ~100mA as the output current. A separate ammeter inline shows the same...a second ammeter agrees. However, the LED doesn't pop.
What's going on here?