Texas Instruments TPS61165EVM-283, Руководство пользователя

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Host
Computer
USB Cable
USB
Interface
Adapter
Green LED
Indicates
Power
10-Pin
Ribbon
Cable
EVM Board
Setup and Test Results
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• Minimum of 256 MB of RAM
2.3 Hardware Setup
After connecting the power supply between J1 and J2, turning on the power supply, and installing JP1 and
JP2, the EVM regulates the default current per
Table 1 through the WLEDs. Additional input capacitance
may be required in order to mitigate the inductive voltage droop that occurs at start-up and/or during a
load transient event.
In order to implement analog dimming via a PWM signal, remove the jumper on JP1 and the 10-pin ribbon
cable from J5 if installed, and perform the following steps in any sequence:
•
Connect the power supply between J1 and J2, and turn on the power supply.
• Ensure that JP2 is installed.
• Remove the shorting jumper from JP1, and connect the appropriately configured function generator to
the CTRL side of JP1.
The PWM signal's duty cycle is directly proportional to the regulated current.
In order to implement analog dimming by sending the digital control via a PC running the TPS6116x
Controller software and USB-TO-GPIO interface box, remove the jumper or the function generator on JP1,
and perform the following steps in any sequence:
•
Connect one end of the USB-TO-GPIO box to the PC using the USB cable and the other end to J5 of
the TPS61165EVM using the supplied 10-pin ribbon cable per
Figure 1 . The connectors on the ribbon
cable are keyed to prevent incorrect installation.
• Connect the power supply between J1 and J2 and turn on the power supply.
• Ensure that JP2's jumper is installed.
• Run the software as explained in the following section.
Figure 1. USB Interface Adapter Quick Connection Diagram
4 TPS61165EVM-283 SLVU224C – January 2008 – Revised February 2010
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