SLOS751D March 2013 – November 2018 DRV2667
The lowest gain setting is optimized for 50 VPP with a boost voltage of 30 V. Some applications may not need 50 VPP, so the user may elect to program the boost converter as low as 15 V to improve efficiency. When using boost voltages lower than 30 V, consider the following: First, to reduce boost ripple to an acceptable level, a 50-V rater, 0.22-µF boost capacitor is recommended. Second, the maximum code range of the digital interface is limited. For example, the user may elect to program the boost voltage to 25 V, and plan for a maximum drive signal of 40 VPP at the actuator. Any digital code given to the FIFO that is greater than 20 VP / 25 VP x 127 = ±102 may induce clipping, so the user must only send digital codes between –102 and 102. Use of codes outside this range, for this example, may clip or drive the actuator beyond its rating.