DRV8814_16 Datasheet, PDF (13/26 Pages) Texas Instruments – DC Motor Driver IC

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8 Application and Implementation
DRV8814
SLVSAB9E – MAY 2010 – REVISED NOVEMBER 2015
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 DRV8814 can be used to control two brushed DC motors. The PHASE/ENBL interface controls the outputs
and current control can be implemented with the internal current regulation circuitry. Detailed fault reporting is
provided with the internal protection circuits and nFAULT pin.
8.2 Typical Application
VM
+
100 µF
0.01 µF
0.01 µF
1 MΩ 0.1 µF
Brushed DC
Motor
200 mΩ
Brushed DC
Motor
200 mΩ
0.01 µF
V3P3OUT
10 kΩ
30 kΩ
DRV8814
CP1
GND
CP2
BI1
VCP
BI0
VMA
AI1
AOUT1
AI0
ISENA
BPHASE
AOUT2
BENBL
BOUT2
AENBL
ISENB
BOUT1
VMB
APHASE
DECAY
nFAULT
V3P3OUT
10 kΩ
AVREF
nSLEEP
BVREF
GND
nRESET
V3P3OUT
V3P3OUT
0.47 µF
Figure 7. Typical Application Schematic
8.2.1 Design Requirements
Specific parameters for designing a dual brushed DC motor drive system.
DESIGN PARAMETER
Supply Voltage
Motor Winding Resistance
Moto Winding Inductance
Sense Resistor Value
Target Full-Scale Current
Table 3. Design Parameters
REFERENCE
VM
R_L
I_L
R_SENSE
I_FS
EXAMPLE VALUE
24 V
3.9 Ω
2.9 mH
200 mΩ
1.25 A
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