Superjunction vs GaN: why no large
difference is seen in hard switching losses
Blue = superjunction
Red = e-mode HEMT
Both ~70 mΩ max R
DS(on)
2b
› Superjunction capacitances are much
higher when compared to GaN
› Superjunction C
oss
and C
rss
behave very
nonlinearly with voltage
› Output charge difference is very large (up
to 10x at 100 V) between superjunction
and GaN
› But gap in E
oss
is much smaller (eg: 20% at
400 V)
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