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xnuke - the average capactative load is from 4 to 9 nF. The frequency range is around 100khz. electricuwe - i think you have the general idea, Its just close to the maxiximum voltage. I do have the scope set up to trigger so i can zoom the time axis in to see the rising and falling edges...

wow, alot of responses, thanks all for the help one of the things that is very frustrating is that the gate driver circuit will run all day long on a normal power supply at 60V. Its only when i hook up the higher voltage output (450V transformer) that it starts intermittently blow IGBTs. So...

This is a long shot, but hoping someone can provide some insight on why I keep popping the fuses on this circuit, it seems to be generally after an IGBT blows. Maybe an idea on circuit protection. The circuit is for ultrsaound cleaning, and cleans well for about 1 minute sometimes. The gate...

benta, thank you, somehow this obvious fact in the spec sheet slipped past me. hdldr. Sorry for not drawing out the full circuit, the mosfet connected on the low side can be connected to a negative voltage rather than ground.

im trying to utlize a gate driver to switch two paired mosfets (half bridge) to generate a waveform at 50Khz from -100 to +100 V. The circuit works well to switch positive voltages (0 to 100V). When i add even small negatiuve voltage, ie -5 to +30V, the circuit becomes unstable. Im not sure...