I was trying to drive the gate of 25N120 IGBT (2800pF gate capacitance) with the help of transistors. The working voltage is 10V. I have tried with BC548 NPN and BC558 PNP.
Everytime I apply PWM, the voltage level just remain 8V - 10V. The LED at output stays on. With positive trigger at base it shows 8V (seems NPN conduct try to ground the OUTPUT) and with negative trigger it shows 10V (seems PNP conduct and does its job.) The problem with the NPN why doesn't ground to 0V.
Even though I checked the output by implementing a 10nF capacitor, but the response is the same whether the output is connected or not.
MOSFET)IGBT drivers are not available here. The whole project was almost done, and now got stuck at this last part. My NPN and PNP configuration is in the photo.