VCC
AGND
DGND
0
R15
1
µ
F
C1
D7
VIN
1
2
J9
5V
D8
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Hardware Description
11
SLCU002 – September 2016
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Copyright © 2016, Texas Instruments Incorporated
BOOSTXL-ULN2003 Dual Stepper Motor Driver BoosterPack Hardware
2.5
Powering the BOOSTXL-ULN2003
2.5.1
Powering the On-Board Devices
The BoosterPack is designed to accept power from a connected Launchpad. The 3.3 V line from the
Launchpad is required to power the SN74HC595 device. The 3.3 V line from the LaunchPad cannot
source enough current to power motors, relays, or LEDs, so an additional source of power is required as
described in
Section 2.5.2
.
2.5.2
Powering the Motor or Other Peripherals
The method of powering the external peripherals is dependent upon the LaunchPad being used in addition
to the output current requirements.
For higher current or voltage applications, the external motor supply pins should be connected to an
external supply as shown in
Figure 11
. The maximum voltage supplied through these pins should not
exceed 30 V, or permanent damage to components may occur. While there is some protection against
reverse polarity included on the board, note the correct orientation of the motor supply pins to avoid
permanent damage to the board.
Figure 11. External Supply Connected to Motor Supply Pins
As shown in
Figure 12
, the VCC connected to the motor peripheral to provide power is created by using
power OR-ing diodes.
•
If there is no 5-V line available from the LaunchPad, the motor supply is required to power the external
peripherals.
•
If there is a 5-V line connected, and no motor supply is connected, the VCC pins provide a voltage
close to 5 V.
•
If there is a 5-V line connected, and the motor supply voltage is connected and greater than 5 V, the
motor supply is used to power any external peripherals.
Figure 12. On-Board Power OR-ing
