DRV8830_16 Datasheet, PDF (17/22 Pages) Texas Instruments – Low-Voltage Motor Driver With Serial Interface

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DRV8830
SLVSAB2G – MAY 2010 – REVISED DECEMBER 2015
Because power resistors are larger and more expensive than standard resistors, it is common practice to use
multiple standard resistors in parallel, between the sense node and ground. This distributes the current and heat
dissipation.
8.2.2.4 Low Power Operation
Under normal operation, using sleep mode to minimize supply current should be sufficient.
If desired, power can be removed to the DRV8830 to further decrease supply current. TI recommends to remove
power to the FAULTn pullup resistor when removing power to the DRV8830. Removing power from the FAULTn
pullup resistor will eliminate a current path from the FAULTn pin through an ESD protection diode to VCC. TI
recommends to set both IN1 and IN2 as a logic low when power is removed.
An undervoltage event may cause the address to be re-evaluated. If this occurs, the I²C interface may stop
working until power is cycled.
8.2.3 Application Curves
The following scope captures show how the output duty cycle changes to as VCC increases. This allows the
motor to spin at a constant speed as VCC changes. At VCC = 3.9 V, the output duty cycle is 100% on. As the
VCC voltage increases to greater than 4 V, the output duty cycle begins to decrease. The output duty cycle is
shown at VCC = 4.5 V, VCC = 5 V and VCC = 5.5 V.
• Channel 1 – OUT1: IN1 – Logic Low
• Channel 2 – OUT2: IN2 – Logic High
• Channel 4 – Motor current: VSET – 1 V
• Motor used: NMB Technologies Corporation, PPN7PA12C1
Figure 12. Output Pulse Width Modulating at VCC = 3.9 V
Figure 13. Output Pulse Width Modulating at VCC = 4 V
Figure 14. Output Pulse Width Modulating at VCC = 4.5 V
Figure 15. Output Pulse Width Modulating at VCC = 5 V
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