DRV8833_16 Datasheet, PDF (12/30 Pages) Texas Instruments – Dual H-Bridge Motor Driver

DRV8833
SLVSAR1E – JANUARY 2011 – REVISED JULY 2015
8 Application and Implementation
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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 DRV8833 is used in brushed DC or stepper motor control. The following design procedure can be used to
configure the DRV8833 in a brushed DC motor application. The inputs and outputs are connected in parallel to
achieve higher current.
8.2 Typical Application
The two H-bridges in the DRV8833 can be connected in parallel for double the current of a single H-bridge. The
internal dead time in the DRV8833 prevents any risk of cross-conduction (shoot-through) between the two
bridges due to timing differences between the two bridges. Figure 7 shows the connections.
VM
From Controller
IN1
IN2
LOW = SLEEP, HIGH = RUN
U1
DRV8833
16
15
AIN1
AIN2
9
10
BIN1
BIN2
1 _NSLEEP
C4 ⁺
10uF
VCP ¹¹
AOUT1
AOUT2
2
4
BOUT1
BOUT2
7
5
NFAULT ⁸
VINT ¹⁴
AISEN ³
BISEN ⁶
C1
0.01uF
M
C2
2.2uF
R2
200m
8.2.1 Design Requirements
Figure 7. Parallel Mode
DESIGN PARAMETER
Motor voltage
Motor RMS current
Motor start-up current
Motor current trip point
8.2.2 Detailed Design Procedure
Table 5. Design Parameters
REFERENCE
V_M
I_RMS
I_START
I_TRIP
EXAMPLE VALUE
10 V
0.8 A
2A
2.5 A
8.2.2.1 Motor Voltage
The motor voltage to use will depend on the ratings of the motor selected and the desired RPM. A higher voltage
spins a brushed DC motor faster with the same PWM duty cycle applied to the power FETs. A higher voltage
also increases the rate of current change through the inductive motor windings.
12
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