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> I never had problems with the internal MOSFET diode in SSTC use.
It depends on the tuning of the driver, the power level and to some extent on the layout. If you want to run near the device maximum ratings and experiment with different tunings then it is wise to bypass the body-drain diodes with external fast-recovery diodes.
If you choose to rely solely on the MOSFET's intrinsic body-drain diodes for free-wheeling action then keep the inverter tuned on the high-side of the tesla coil's resonant frequency for a long and stress-free MOSFET life.
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Mosfet body diode blocking
