DRV8711_15 Datasheet, PDF (30/44 Pages) Texas Instruments – DRV8711 Stepper Motor Controller IC

DRV8711
SLVSC40E – JUNE 2013 – REVISED MARCH 2015
Typical Application (continued)
TYPICAL APPLICATION
VM
+
100 uF 0.01 uF
0.1 uF
1 uF
0.1 uF
1 uF
MCU
With Optional
ADC (for BEMF)
DRV8711
CP1
GND
CP2
AOUT1
VCP
VM
A1HS
A1LS
GND
AISENP
V5
AISENN
VINT
A2LS
SLEEPn
A2HS
RESET
AOUT2
STEP / AIN1
GND
DIR / AIN2
BOUT1
BIN1
B1HS
BIN2
B1LS
SCLK
BISENP
SDATI
BISENN
SCS
B2LS
SDATO
B2HS
FAULTn
BOUT2
STALLn / BEMFVn
PPAD
BEMF
VM
(1)
VM
50 PŸ
(1)
(1) Optional series resistor
VM
(1)
VM
50 PŸ
(1)
1 nF
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Step
Motor
Figure 20. Typical Application Schematic
8.2.1 Design Requirements
For this design example, use the parameters listed in Table 5 as the input 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
Table 5. Design Parameters
REFERENCE
VM
R_L
I_L
θ_step
n_m
v
I_FS
EXAMPLE VALUE
24 V
3.9 Ω
2.9 mH
1.8°/step
8 µsteps per step
120 RPM
1.25 A
30
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