I have a simple half mosfet bridge. The mosfet i use has crss 350pF and Coss as 870pF. So the Cds would be 520pF. I have a gating pulse to these mosfet with deadtime of about 500ns, which more than enough to prevent shoot through. Suppose i have no load connected to the bridge and i just apply the gating pulse. The bridge keg should draw current that is charging the Cds. When i calculated it, it comes out to be 1A. But when i do simulation and experiment, i see it to be more than 6A. I am not able to track down the logic for it. Any MOSFET expert please explain me. kristo.
- posted
18 years ago