A3906 データシートの表示（PDF） - Allegro MicroSystems
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A3906 Datasheet PDF : 10 Pages
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A3906
Low Voltage Stepper and Single/Dual DC Motor Driver
Applications Information
External PWM If external PWM is used, the internal current
control can either be disabled by shorting the SENSEx pin to
ground, or it can be used to limit the peak current to a value under
the stall current to prevent motor heating. External PWM IN1
control is shown in the upper figure.
Stepper Motor Control The A3906 also can be used to control
a bipolar stepper motor. The control logic for stepper motor
control is shown in the lower figure. The driver is capable of
operating in full- and half-step modes.
PWM current control in fast and
slow decay modes
IN1,
IN3
VIN(1)
GND
VIN(1)
IN2,
IN4
GND
+IREG
IOUTx
0A
-IREG
Forward/
Fast Decay
Reverse/
Fast Decay
Forward/
Slow Decay
Reverse/
Slow Decay
Stepper motor control in full- and
half-step modes
VIN(1)
IN1
GND
IN2
VIN(1)
GND
VIN(1)
IN3
GND
VIN(1)
IN4
IOUT1 ,
IOUT2
IOUT3 ,
IOUT4
GND
R+VmoBtBo/r
0A
R–VmoBtBo/r
R+VmoBtBo/r
0A
R–VmoBtBo/r
Full Step
Sleep
Half Step
Allegro MicroSystems, Inc.
7
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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