EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: ikcalB on March 18, 2016, 11:26:22 am
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Hi guys,
while building a stepper controller, we seem to get random defects on our high-side N-channel MOSFET drivers.
My collegue designed the controller based on a Texas Instruments DRV8711..
(this IC is basically a double H-bridge driver and also takes care of current regulation)
On the eval-board, as well as on our prototype run from a lab power supply, we did not
experience hardware defects. (we're going back to that setup, and try testing more thoroughly with that)
ATM we're on a test-setup, which is like the final control in the machine and get random defects on the DRV8711:
Sometimes while running, sometimes when just applying power to the motor - that IC dies.
Most of the time we only have shorts from high-side driver / chargepump / internal voltage regulators to ground,
once and then we get physical damage: the case spalls away around pin4 (which is power supply).
See the schematic and the most relevant datasheets attached, here is a link to our discussion on the TI forum:
http://e2e.ti.com/support/applications/motor_drivers/f/38/t/498750 (http://e2e.ti.com/support/applications/motor_drivers/f/38/t/498750)
DRV8711 product page: http://www.ti.com/product/DRV8711 (http://www.ti.com/product/DRV8711)
This project is under pressure - any help greatly appreciated, guys!
Thank you very much & best regards from AUSTRIA,
Florian