GaN 器件第三象限导通特性

 一、原理

　　The condition to turn on the channel for reverse conduction is the gate to drain voltage Vgd is higher than the threshold voltage (VGS(th)).

　　Vgd > Vth 时，GaN 工作在第三象限。

二、特性

　　GaN反向导通（第三象限导通）的伏安特性等效电路是一个含有导通电压的二极管和一个定值电阻。

　　If negative bias (-Vgs_off) is applied, Vsd>Vth+Vgs_off.     Vsd(@Vgs＝－Vgs_off) ＝ Vsd(@Vgs＝0) ＋ Vgs_off

　　At off operation, conduction loss ＝ Vsd × Isd ＝Vsd(@Vgs＝0) ＋Vgs_off）× Isd

 

三、代价

　　Negative bias is an effective means for false turn-on preventive measures but the trade-off is conduction loss. Please consider negative bias value and the dead time.