MYTH #2: e-mode devices have no Qrr
MYTH #2: e-mode devices have no Qrr
Actuality: When switching from reverse conduction to off-state, the reverse restoration cost accounts for not solely bipolar transport minority carriers recombination but additionally the formation of the space-charge area, which is successfully equal to the output cost (Qoss). It’s true that GaN HEMTs don't have any reverse conduction bipolar transport, however they however do have output capacitance that must be charged throughout reverse restoration. In a nutshell, Qrr = Qoss. Qrr can't be zero. Fantasy busted!
Extra myths
Fantasy #1: Si MOSFETs add-on state resistance reverse restoration cost
Uncover what chip actually handles the vast majority of off-state excessive voltage — and which one contributes lower than 10 p.c of the full cascode resistance.
Fantasy #3: Cascode GaN oscillates
Learn how following normal design ideas enhances efficiency and suppresses oscillations and EMI.
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