不知道这种驱动波形是否正确,单路驱动最大占空比难道能接近100%吗
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duty是可以大于50%而且可以接近100%。
我们是通过电阻对地去设置这个最大占空比的,见规格书第九页管脚说明:
Maximum Duty-Cycle Resistor. Maximum PWM duty-cycle programming pin. A resistor to GND sets the PWM maximum duty-cycle based on the ratio of RDMX/RRT.
规格书第四页RRT = 75 kΩ, RDMX = 68.1 kΩ,这个时候占空比可以最大到95%