Hello,
We are using ADuM3223 to drive DC motor with half bridge and boostrap. The purpose is to replace an old schematic using DC/DC converter with optocouplor.
Mosfet used are IPB027N10N3, the ADuM are managed by gpio on raspberry. We have tested 2 position: supply the motor directly with bridge, and shutdown using "shunt" method (see below)
https://drive.google.com/file/d/1KnZie2zePEjXX7Tt3urAEEpgwB8gp45I/view?usp=sharing
Ou schematic look like that and are based on the eval board of the ship :
https://drive.google.com/file/d/1FCEs7yCKfJWTaJMH8cwwVvTL9zT3FNu9/view?usp=sharing
During shutdown we oberved overvoltage and timing is very long (around 10ms) that seem strange to drive a mosfet... voltage on capture below is take between PV and COM
https://drive.google.com/file/d/1AmBrsLnHKCsEXlN9j0zEHJwhJmIcuLwO/view?usp=sharing
Our schematic using same ground for motor and output supply (VDDB/GNDB) and with GNDA not at the same potentiel but using VDDB for VDDB can be the cause ? or maybe our method to drive the mosfet with gpio ?
regards
