Dear TI Support Team,
I am evaluating the DRV10983 using the respective EVM. I have an old design using a Toshiba TB6575FNG for an controller that I received for evaluating the motor I have to use by customer request. Now first the good news: The DRV10983 spins the motor smoothly at all required speeds, reacts much better to load changes especially at lower speeds and overall the motor runs much more quietly. So far so good, BUT:
With the the DRV10983 EVM my lab supply shows me close to 500mA spinning the motor at no load condition with 40 thousand rpm and the motor gets very hot. This is already with the empirically tuned "T control advance" set to 220 us (any other value will further increase the power consumption. With the "original" Toshiba controller the motor runs less smoothly and makes lots of noise, but the supply shows only 320 mA under the same conditions and the motor ends up at 40 Kelvin lower than with the DRV10983.
Now while I know that the DC current draw as shown by my lab supply is off, What am I missing here? Where does the additional power consumption come from.
Best regards,
Sebastian.