SP7-223F50 .022uf 50V 1% Axial Lead Film Capacitor (2 pieces)

Recently, I've been playing around with some high power LEDs. To efficiently dim the brightness, I built up this simple test circuit, which features a function generator to create an adjustable PWM signal, and n-channel MOSFET in series to the LED, to actually turn it on and off rapidly, and a TC4420 MOSFET driver IC to charge / discharge the power MOSFETs gates as quickly as possible. Now in the low frequency range This circuits dims the LED perfectly fine by changing the duty cycle of the PWM signal. But while for example using a frequency of 100 kHz and a duty cycle of 1%, The circuit works for a couple of minutes, but then randomly stops working. Because the MOSFET driver IC apparently destroyed itself. After replacing it. This circuit worked fine once again but this time I examined the pins voltages of the IC with my oscilloscope, to determine the culprits. And while probing the su