User manual

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Setup and Test Results

2.1.3 J3-VOUT

This header is the positive voltage output for the device.

2.1.4 J4-GND

This header is the return connection for the load.

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-FB

This header connects to the FB pin of the IC through resistor R4. Resistor R4 is unpopulated.

2.1.7 JP1-ON/CTRL

Installing this jumper ties the CTRL pin to V

, and enables the device. Removing the jumper allows the

internal pulldown resistor to pull CTRL to ground, which disables the device. The jumper should be

removed if using an external signal to perform dimming.

2.1.8 JP2-Open LED

Installing this jumper places the WLEDs in the boost converter 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 overvoltage protection circuit of the IC clamps the

boost converter output to 38 V (typ).

WARNING

This EVM has white LEDs that shine very 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 3 V to 18 V at 1 A.

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 FB pin of the IC 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 also can

implement dimming by using a digital control signal. The EVM kit includes a PC software compact disk

(CD) and USB-TO-GPIO interface box which, when installed on a personal computer (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)

• Minimum of 256 MB of RAM

SLVU221D–December 2007–Revised May 2013 TPS61160EVM-243/TPS61161EVM-243

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