UCC21759-Q1
SLUSEB4A – AUGUST 2020 – REVISED DECEMBER 2020
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7.5 Desaturation (DESAT) Protection
7.5.1 DESAT Protection with Soft Turn-OFF
DESAT function is used to detect VDS for SiC-MOSFETs or VCE for IGBTs under over current conditions. Figure
7-10 shows the timing diagram of DESAT operation with soft turn-off during the turning on transition.
IN
(”IN+‘ Å ”INÅ‘)
VDESAT
tDESATLEB
tDESATLEB
tDESATFIL
DESAT
tDESATOFF
90%
GATE
VCLMPTH
tDESATFLT
tFLTMUTE
Hi-Z
FLT
tRSTFIL
tRSTFIL
RST/EN
HIGH
Hi-Z
OUTH
OUTL
LOW
Hi-Z
LOW
Figure 7-10. DESAT Protection with Soft Turn-OFF During Turn-on Transition
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