DRV8886AT Datasheet, PDF (29/40 Pages) Texas Instruments – 2-A Stepper Motor Driver With Integrated Current Sense and AutoTune Technology

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8 Application and Implementation
DRV8886AT
SLVSDO1 – JANUARY 2017
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The DRV8886AT device is used in bipolar stepper control.
8.2 Typical Application
The following design procedure can be used to configure the DRV8886AT device.
30 k
0.47 F
DRV8886PWP
24
DECAY
23
TRQ
22
M1
21
M0
20
DIR
19
STEP
18
ENABLE
17
nSLEEP
16
RREF
15
nFAULT
14
DVDD
13
AVDD
1
CPL
2
CPH
3
VCP
4
VM
5
AOUT1
6
PGND
7
AOUT2
8
BOUT2
9
PGND
10
BOUT1
11
VM
12
GND
0.47 F
0.022 F
0.22 F
Step
Motor
+±
0.01 F
VM
0.01 F
VM
+ ^{100 F}
Copyright © 2017, Texas Instruments Incorporated
Figure 27. Typical Application Schematic
8.2.1 Design Requirements
Table 10 lists the design input parameters for system design.
Table 10. Design Parameters
DESIGN PARAMETER
Supply voltage
Motor winding resistance
Motor winding inductance
Motor full step angle
Target microstepping level
Target motor speed
Target full-scale current
REFERENCE
VM
R_L
L_L
θ_step
n_m
v
I_FS
EXAMPLE VALUE
24 V
2.6 Ω/phase
1.4 mH/phase
1.8°/step
1/8 step
120 rpm
2.0 A
Copyright © 2017, Texas Instruments Incorporated
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