IRFF9120 L V D S R G D .U .T VD D IA S A D R IV E R -20V -10V t 0.0 1 p Ω 15V Fig 12a. Unclamped Inductive Test Circuit I A S Fig 12c. Maximum Avalanche Energy Vs. Drain Current tp V (BR)DSS Fig 12b. Unclamped Inductive Waveforms Current Regulator Same Type as D.U.T. 50KΩ QG -12V .2µF 12V .3µF -10V - Q V GS QGD D.U.T. + DS V V GS G -3mA I I G D Charge Current Sampling Resistors Fig 13a. Basic Gate Charge Waveform Fig 13b. Gate Charge Test Circuit 6 www.irf.com