Part Number: DRV8303
Hello to everyone,
I have a new issue with the above mentioned three phase driver.
I have an application where I use two legs of drv8303 to drive a reversible DC motor. In this application there's the real chance that this motor will be forced to move while the drive is turned off. Here is what I see on the scope when I move the motor to a fraction of the nominal speed.
Green trace is HS_A
Yellow is GH_A
Pink is GH_A - HS_A
As you can see there's a negative VGH_DIF lower than the minimum absolute rating of the IC. And, of course, sometimes the IC is killed by this treatment.
I can't find any workaround, since it seems to me that vbus capacitors charging through the body diode of the high side mosfet is causing the presence of this voltage. Does it means i can't use DRV8303 in an application where i can expect some kind of regeneration into a turned off board?
Rick DuncanMotor Applications Team
In reply to Rick Duncan:
did you find anything about this matter? Do you need further information?
In reply to Simone Freato:
Phil BeardMotor Applications Team
In reply to Phil Beard:
I'm sorry, I was meaning SH_A and GH_A, pins 42 and 43.
here you are a photo of the IC. Your hypothesis is supported by the fact that this is the first time we see a damage in this condition, we use DRV8301 and DRV8301 since 5 years now, and regeneration with a powered off inverter is quite common in our applications.
Thanks for your support.
have you got some news?
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