I am working to develop a high-side switch in a high-voltage (600V) circuit used to charge a capacitor. The purpose of the switch is to isolate a DC power supply from a controlled plasma breakdown, which drains the charge in the capacitor. The switch works great when during a simple charge/discharge of the capacitor through a resistor. The problem comes when I introduce the plasma breakdown, my high-side gate-driver IC (Fairchild FAN7392) sees a large negative voltage (~ -100 V). The chip burns and actually starts smoking.
I have tried to remedy this by placing a diode and a resistor directly after the Vs, however the chip is still going bust.
Any suggestions or help? Could it be that the diode I am using doesn't clamp fast enough?
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