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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

Hello,

 

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,

Fabian

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