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S12 ZVML31 no GDU Flag

Question asked by Fabian Sonnleitner on Sep 6, 2016
Latest reply on Sep 15, 2016 by iggi



I am using a S12 ZVML31 for a sensorless BLDC application. When the voltage drops down to 5.8V I do not get a GDUF error due to low voltage. Instead the signals on high side are switched with the low side for 400us.


Please find attache a scope screenshot.

purple - HD pin

blue - high side gate

yellow - low side gate

green - can be ignored


The voltage drop on HD is due to an active short on the lowside, for breaking.


Does anyone know this Problem?


all the best,