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A4964 Datasheet(PDF) 45 Page - Allegro MicroSystems

Part # A4964
Description  Sensorless Sinusoidal Drive BLDC Controller
PDF  92 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A4964 Datasheet(HTML) 45 Page - Allegro MicroSystems

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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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