Hi N.AB,
Could you have detailed running state before the damage happens? If motor quickly speeded down at 25V, the real PVDD can go up to 2x or more, depends on the deceleration rate, especailly when you don't have the big bulk caps. You can redo the tests with 1000uF cap placed close to the half bridage tops. And monitor the PVDD voltage through the pins if any damage happened. A safe way to investigate the issue is to apply a slower deceleration first, example, from 100% speed to 80% speed and monitor the PVDD change during this speed down.
You can do the test with and without the big bulk caps installed. By this way, we can identify whether there is directly relationship of the root cause and high pump voltage.
Besides, DRV8303 must be well soldered down with its PowerPAD connected to the GND. This is very important to make it function correctly. Many customers have the issue when testing in lab with hand soldering.
Best regards,
Could you have detailed running state before the damage happens? If motor quickly speeded down at 25V, the real PVDD can go up to 2x or more, depends on the deceleration rate, especailly when you don't have the big bulk caps. You can redo the tests with 1000uF cap placed close to the half bridage tops. And monitor the PVDD voltage through the pins if any damage happened. A safe way to investigate the issue is to apply a slower deceleration first, example, from 100% speed to 80% speed and monitor the PVDD change during this speed down.
You can do the test with and without the big bulk caps installed. By this way, we can identify whether there is directly relationship of the root cause and high pump voltage.
Besides, DRV8303 must be well soldered down with its PowerPAD connected to the GND. This is very important to make it function correctly. Many customers have the issue when testing in lab with hand soldering.
Best regards,