DRV8837_15 Datasheet, PDF (12/24 Pages) Texas Instruments – Low-Voltage H-Bridge Driver

DRV8837, DRV8838
SLVSBA4D – JUNE 2012 – REVISED DECEMBER 2015
8 Application and Implementation
www.ti.com
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 DRV883x family of devices is device is used to drive one dc motor or other devices like solenoids. The
following design procedure can be used to configure the DRV883x family of devices.
8.2 Typical Application
VM
0.1 µF
M
DRV8837 and
DRV8838
1 _VM
VCC ⁸
2
OUT1
nSLEEP ⁷
3
OUT2
6
IN1/PH
4
GND
5
IN2/EN
VCC
0.1 µF
Figure 10. Schematic of DRV883x Application
8.2.1 Design Requirements
Table 5 lists the required parameters for a typical usage case.
Table 5. System Design Requirements
DESIGN PARAMETER
Motor supply voltage
Logic supply voltage
Target rms current
REFERENCE
VM
VCC
I_OUT
EXAMPLE VALUE
9V
3.3 V
0.8 A
8.2.2 Detailed Design Procedure
8.2.2.1 Motor Voltage
The appropriate motor voltage depends 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.
8.2.2.2 Low-Power Operation
When entering sleep mode, TI recommends setting all inputs as a logic low to minimize system power.
12
Submit Documentation Feedback
Copyright © 2012–2015, Texas Instruments Incorporated
Product Folder Links: DRV8837 DRV8838