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Setup and Test Results
2.1.1
J1-VIN
This header is the positive connection to the input power supply. The leads to the input supply should be
twisted and kept as short as possible.
2.1.2
J2-GND
This header is the return connection to the input power supply.
2.1.3
J3-VOUT
This header is the positive output for the device.
2.1.4
J4-FB
This header connects to the IC's FB pin through resistor R4. The EVM does not have resistor R4
populated.
2.1.5
J5-USB-TO-GPIO Connector
This connector is for the 10-pin ribbon cable that connects the EVM to the USB-TO-GPIO interface box. It
is only used when the software is used to perform dimming.
2.1.6
J6-GND
This header is the return connection for the load.
2.1.7
JP1-ENable
Installing this jumper ties the EN pin to V
IN
, thereby enabling the device. Removing the jumper allows the
internal pulldown resistor to pull EN to ground, thereby disabling the device. The shorting jumper must be
removed when using EasyScale™ control.
2.1.8
JP2-Open LED
Installing this jumper places the WLEDs in the boost converter's feedback path and allows current to flow
through the WLEDs. Removing the jumper removes the WLEDs from the boost converter feedback path.
With this jumper removed and jumper JP1 installed, the IC's overvoltage protection circuit clamps the
boost converter output to 38 V (typ).
WARNING
This EVM has a white LED that shines brightly. Protective eye wear
and/or a diffuser to cover the white LED is recommended.
2.2
Hardware Requirements
This EVM requires an external power supply capable of providing 5 V at 1.5 A.
In order to change the default current value (i.e., implement dimming), the user can apply either a PWM or
digital control signal to CTRL. Both signals change the feedback voltage at the IC's FB pin, so that the IC
performs analog dimming. A function generator capable of driving the CTRL pin with 1.2 V to VIN
amplitude and, 5-kHz to 100-kHz PWM signal is required for PWM controlled dimming. The user can also
implement dimming using a digital control signal. The EVM kit includes a PC software CD and
USB-TO-GPIO interface box which, when installed on a PC and connected to the EVM, allows the user to
communicate with the EVM via a GUI interface. The minimum PC requirements are:
•
Windows™ 2000 or Windows™ XP operating system
•
USB port
•
Minimum of 30 MB of free hard disk space (100 MB recommended)
3
SLVU224C – January 2008 – Revised February 2010
TPS61165EVM-283
Copyright © 2008–2010, Texas Instruments Incorporated
