DRV8824_16 Datasheet, PDF (19/35 Pages) Texas Instruments – Stepper Motor Controller IC

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DRV8824
SLVSA06J – OCTOBER 2009 – REVISED JULY 2014
9 Application and Implementation
9.1 Application Information
The DRV8824 is used in bipolar stepper control. The microstepping motor driver provides additional precision
and a smooth rotation from the stepper motor. The following design is a common application of the DRV8824.
9.2 Typical Application
0.01 µF
DRV8824
CP1
GND
CP2
nHOME
V3P3OUT
10 kŸ
0.1 µF
1MŸ 0.1 µF
VCP
VMA
MODE2
MODE1
VM
+
100 µF
Stepper Motor
+
±
400 mŸ
400 mŸ
0.1 µF
V3P3OUT
10 kŸ
30 kŸ
AOUT1
ISENA
AOUT2
BOUT2
ISENB
BOUT1
VMB
AVREF
BVREF
GND
MODE0
NC
STEP
nENBL
DIR
DECAY
nFAULT
nSLEEP
nRESET
V3P3OUT
V3P3OUT
10 kŸ
V3P3OUT
0.47 µF
9.2.1 Design Requirements
Table 3 gives design input parameters for system design.
Design Parameter
Supply voltage
Motor winding resistance
Motor winding inductance
Motor full step angle
Target microstepping level
Target motor speed
Target full-scale current
Table 3. Design Parameters
Reference
VMx
R_L
L_L
θ_step
n_m
v
I_FS
Example Value
24 V
1.0 Ω/phase
3.5 mH/phase
1.8°/step
8 microsteps per step
120 rpm
1.25 A
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