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A4964 Datasheet(PDF) 45 Page - Allegro MicroSystems |
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A4964 Datasheet(HTML) 45 Page - Allegro MicroSystems |
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45 / 92 page ![]() Sensorless Sinusoidal Drive BLDC Controller A4964 45 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com in supply voltage, will be minimized. For the open-loop speed mode, it means that the duty cycle applied to the bridge will be continuously modulated to maintain the same effective voltage applied to the motor. Supply voltage compensation is not required for the closed-loop current control mode. In this mode, the current is controlled on a PWM cycle-by-cycle basis and is therefore unaffected by any change in supply voltage. The range of bridge supply voltage over which the duty cycle compensation is effective is limited in each case. For the 12 V nominal selection, the range is 7 V to 19 V. For the 24 V nominal selection, the range is 14 V to 38 V. The function is enabled and the nominal voltage selected by the contents of the DV[1:0] variable. When DV[1:0] = [0,0], the duty cycle compensation feature is disabled. When DV[1:0] = [0,1] or [1,1], the nominal voltage is 12 V. When DV[1:0] = [1,0], the nominal voltage is 24 V. |
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