Hello,
For RS1, RS2, and RS3, are these all copper trace sense resistors? When you've seen these boards fail, do you know the temperature of the PCBs?
I'm curious if the resistance of your copper shunt resistors is significantly changing with temperature and violating our Abs-Max Voltage spec of the SN / SP pins during your high-current testing. This could be causing damage to the internal Current Shunt Amplifiers, and when these eventually fail, the AVDD regulator is damaged (supply for the Current Shunt Amplifiers).
When you get a FAULT pulse in your testing, are you able to determine if this is an SNS_OCP fault?
If you try using Sense Resistors instead of the copper traces, does the performance of your design improve?
For RS1, RS2, and RS3, are these all copper trace sense resistors? When you've seen these boards fail, do you know the temperature of the PCBs?
I'm curious if the resistance of your copper shunt resistors is significantly changing with temperature and violating our Abs-Max Voltage spec of the SN / SP pins during your high-current testing. This could be causing damage to the internal Current Shunt Amplifiers, and when these eventually fail, the AVDD regulator is damaged (supply for the Current Shunt Amplifiers).
When you get a FAULT pulse in your testing, are you able to determine if this is an SNS_OCP fault?
If you try using Sense Resistors instead of the copper traces, does the performance of your design improve?
