SLOSE51A June 2020 – December 2020 DRV8428E
ADVANCE INFORMATION
Smart tune Ripple Control operates by setting an IVALLEY level alongside the ITRIP level. When the current level reaches ITRIP, instead of entering slow decay until the tOFF time expires, the driver enters slow decay until IVALLEY is reached. Slow decay operates similar to mode 1 in which both low-side MOSFETs are turned on allowing the current to recirculate. In this mode, tOFF varies depending on the current level and operating conditions.
This method allows much tighter regulation of the current level increasing motor efficiency and system performance. Smart tune Ripple Control can be used in systems that can tolerate a variable off-time regulation scheme to achieve small current ripple in the current regulation.
The ripple current in this decay mode is 7.5mA + 1% of the ITRIP at a specific microstep level.