AO3400 Gate Charge Test Circuit & Waveform Vgs Qg + 10V + VDC + Qgs Qgd Vds VDC - - DUT Vgs Ig Charge R e s istiv e S w itch in g T e st C ircu it & W a ve fo rm s R L V ds V d s 90 % + D U T V d d V g s V g V D C R g - 1 0% V g s V gs t t r d (o n ) d (o n t t d (o ff) f ton toff D io d e R eco very T est C ircu it & W a vefo rm s V ds + Q = - Idt + rr D U T V gs t V ds - L Isd I rr Isd F dI/dt + I V gs R M V dd VD C V dd - V ds Ig Rev 8: Dec 2011 www.aosmd.com Page 5 of 5