I am trying to make a switch with an IGBT STGP19NC60HD. Here is a link to the data sheet.
My simple circuit looks like this:
simulate this circuit – Schematic created using CircuitLab
Im sorry for not using the right symbol as the transistor, I did not see an IGBT symbol. I just want the voltage at the gate to turn the switch on and off. I have a 0-15V signal at the gate and some arbitrary signal at the collector – lets just say it is a 0-2V sine wave. When the gate voltage is 0V I expect the emitter voltage to be 0V. When I make the gate voltage 15V I want my sine wave to pass through to the emitter. In other words, I am trying to turn my sine wave on and off with a 0-15V logic signal at the gate. This works with a simple 2n222 transistor but not with the IGBT. With the IGBT I just get little upward spikes on the rising edge of the gate switch and downward spikes on the falling edge, but the sine wave does not pass through. Why not? Can I use an IGBT to make a simple switch like this?
Best Answer
1) you have a gate resistor of 1k when the datasheet is cited for 10R (for datasheet-like results)
2) you are putting a 2V signal on the collector of a 600V device whose Vce_sat is ... 2V
IGBT's are funny devices, their actual characteristics do not manifest themselves until you get reasonable voltage across then and reasonable voltage. A typical 3rd Gen 1200V IGBT at work will not switch fast enough or completely until it has at least 50V across it.