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In the AX2550, the PWM cycle is divided into 128 steps. Other than always on and always off, the AX2550 can generate any ratio ranging from 1/128th to 127/128th. Another way to put it is that the controller output can range fro 0% power to 100% power in 128 steps of 0.8%. This is a very fine level of control by any practical measure.
