Texas Instruments TPS61177AEVM User manual

TPS61177AEVM User Guide
User's Guide
Literature Number: SNVU490
OCTOBER 2015

Contents
1 Introduction......................................................................................................................... 4
2 Set-Up ................................................................................................................................ 4
2.1 Input/Output Connector Description ................................................................................... 4
2.2 TPS61177AEVM Set-Up................................................................................................ 6
2.2.1 Installation Guide for GUI Program (Windows7-Compatible)........................................... 6
2.3 Instructions fo Stand-Alone Evaluation .............................................................................. 18
2.4 Instructions for Evaluation With Software ........................................................................... 19
3 TPS61177AEVM Component Placement ................................................................................ 20
4 Schematic ......................................................................................................................... 22
5 TPS61177AEVM Bill of Materials .......................................................................................... 23
6 TPS61177A Usage and Programming.................................................................................... 24
6.1 In-Circuit Operation..................................................................................................... 24
6.2 ENABLE.................................................................................................................. 24
6.3 Boost Converter Configuration........................................................................................ 24
6.3.1 Setting the Boost Switching Frequency.................................................................. 24
6.3.2 Setting the Boost Voltage.................................................................................. 24
6.3.3 Setting the Boost Switch Slew Rate...................................................................... 24
6.4 LED Driver Configuration.............................................................................................. 24
6.4.1 Setting the Maximum LED Current ....................................................................... 24
6.4.2 PWM Output Frequency ................................................................................... 24
6.4.3 Dimming Mode Settings.................................................................................... 25
6.5 Support for Fault Conditions .......................................................................................... 25
6.5.1 Thermal Shutdown.......................................................................................... 25
6.5.2 Undervoltage Lockout ..................................................................................... 25
6.5.3 Undervoltage Lockout ..................................................................................... 25
6.5.4 Overvoltage Protection..................................................................................... 25
6.5.5 Undervoltage Lockout ..................................................................................... 25
6.6 ID Register............................................................................................................... 25
6.7 EEPROM Default Values.............................................................................................. 25
6.8 Instructions for Programming EEPROM............................................................................. 26
7 Related Documentation From Texas Instruments................................................................... 26
2Table of Contents SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com
List of Figures
1 TPS61177AEVM Evaluation Board ....................................................................................... 4
2 TPS61177AEVM With USB2Any Board Connected .................................................................... 6
3 TPS61177A GUI - First Page............................................................................................. 14
4 Option to Select Register Control ........................................................................................ 15
5 TPS61177A GUI - Register Control Page .............................................................................. 16
6 Default Jumper Configuration............................................................................................. 18
7 TPS61177A EVM Test Setup for Standalone Evaluation............................................................. 19
8 TPS61177A EVM Test Setup With USB2ANY Connected for Software Control .................................. 20
9 TPS61177AEVM Component Placement (Layout) .................................................................... 21
10 TPS61177AEVM Schematic.............................................................................................. 22
List of Tables
1 Device and Package Configurations ...................................................................................... 4
3
SNVU490–OCTOBER 2015 List of Figures
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Introduction www.ti.com
1 Introduction
The Texas Instruments TPS61177AEVM evaluation module (EVM) helps designers evaluate the operation
and performance of the TPS61177A High-Efficiency LED Backlight Driver. The device offers configurability
and can be set up to switch at 450 kHz, 600 kHz, 800 kHz, and 1.2 MHz.
The EVM contains one LED driver (see Table 1).
Table 1. Device and Package Configurations
LED DRIVER IC PACKAGE
U1 TPS61177A VQFN
Figure 1. TPS61177AEVM Evaluation Board
2 Set-Up
This section describes the jumpers and connectors on the EVM, as well as how to properly connect, set
up, and use the TPS61177AEVM.
2.1 Input/Output Connector Description
J1 - Input: This header is the power input(VIN) terminal for the boost converter. The terminal provides a
power (VBAT) connection to allow the user to attach the EVM to a power supply.
J2 - Input: This header is the power input (GND) terminal for the boost converter. The terminal provides a
power ground(PGND) connection to allow the user to attach the EVM to a power supply.
J3 - Input: T his header is the power input terminal for the boost converter. The terminal provides a power
and power ground connection to allow the user to attach the EVM to a power supply using a 2-pin IDC
socket and also monitor VIN connected to J1.
J4 - Connector: This connector is for interfacing LED load board via ribbon cable or flying wires.
J5 - GND: This header connects to AGND to provide grounds for signal probing.
J6 - GND: This header connects to AGND to provide grounds for signal probing.
J7 - Input: This header connects to AGND to provide grounds for signal probing.
J8 - Connector: This connector is for interfacing with USB2ANY interface board for I2C communication
and control inputs such as PWM and EN signal.
4List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
J9 - GND: This header connects to AGND to provide grounds for signal probing.
J10 - Connector: This connector is for interfacing LED load board(WLEDEVM-260) via 2 row ribbon
cable.
J17 - Connector: This connector is to use PWM signal from USB2ANY instead of VIN or external one
chosen by JP9.
J18 - Connector: This connector is to use EN signal from USB2ANY instead of VIN or external one
chosen by JP1.
JP1 - Jumper: This jumper is for selecting EN input state between high and low.
JP2 - Jumper: This jumper is for connecting VOUT to J4 and J10 for LED load connection.
JP3 to JP8 - Jumpers: These jumpers are for enabling or disabling LED channels.
JP9 - Jumper: This jumper is used to set PWM control. Connecting pin 1 and pin 2 will send high signal
to device and set full on. Connecting pin2 and pin3 will send low signal to device and set off.
JP10 - Jumper: This jumper is a small pad to place jumper resistor or current sensing resistor on VIN.
JP11 to JP16 - Jumpers: TThese jumpers are used to bypass 10-Ωseries resistors to measure LED
string current.
JP17 - Jumper: This jumper is used to bypass series resistor on boost feedback (VLED) input.
JP18 - Jumper: This jumper is used to connect VIN to boost circuit or to bypass JP10.
TP1 - Test Point: This header is test point for VIN.
TP2 - Test Point: This header is test point for VINB.
TP3 - Test Point: This header is test point for VCC out.
TP4 - Test Point: This header is test point for boost switch node voltage.
TP5 - Test Point: This header is test point for REF.
TP6 - Test Point: This header is test point for VLED (boost feedback).
TP7 - Test Point: This header is test point for boost output voltage.
TP8 - Test Point: This header is test point for EN.
TP9 - Test Point: This header is test point for PWM input.
TP10 - Test Point: This header is test point for SCL (I2C clock).
TP11 - Test Point: This header is test point for SDA(I2C data).
TP12 - Test Point: This header is test point for CS1(LED driver out for channel 1).
TP13 - Test Point: This header is test point for CS6(LED driver out for channel 6).
5
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
2.2 TPS61177AEVM Set-Up
Figure 2. TPS61177AEVM With USB2Any Board Connected
External power must be provided to the board. A standard USB to mini USB cable must be connected to
the USB2ANY from a PC. The I2C-compatible interface program provides all of the controls that the
TPS61177A device requires.
For proper operation:
• - USB2ANY should be plugged into the PC before the interface program is opened.
• - Install and execute the GUI program – installation guide will be followed below.
• - Power the evaluation board
2.2.1 Installation Guide for GUI Program (Windows7-Compatible)
• Execute setup_TPS61177A_EVM.exe file : If it is compressed in zip file format, unzip first in any
location.
• Select “Run” though Windows security warning message appears
6List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
• Click "Next" button.
• Check to accept the agreement and click “Next” button to proceed with installation.
7
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
• Click “Next” button. In default, program will be installed in C:\Program Files (x86)\Texas
Instruments\TPS61177A folder and Texas Instruments\TPS61177AEVM in start menu.
• Check to create a desktop icon for the program and click “Next” button.
8List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
• Click “Install” button.
• Click “Finish” button to finish installation and launch the program.
9
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
• If firmware update of USB2ANY adaptor is needed this window will pop up.
• Depending on firmware versions in USB2ANY adaptors, this firmware uploader will appear, and then
follow the instruction on this window.
10 List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
• After disconnecting USB cable and plugging it while pressing S1 button, this window will pop up and it
is ready to be updated. Press “Update Firmware” button.
11
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
• Update is finished.
12 List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
If firmware mismatch window appears after this process again, try to unplug USB cable from the box and
plug again.
The USB2ANY is recognized as an HID-compliant device in Windows Device Manager. After firmware
update is completed, successful communication with the board by the application is confirmed by the
"Connected" field at the bottom left corner with “Green” dot. This green dot becomes red when USB2ANY
is not detected by or disconnected from the PC and “Connected” will change to “Not connected”.
The first screen of the GUI will show the brief information and connecting diagram of the device (see
Figure 3).
13
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
Figure 3. TPS61177A GUI - First Page
In order to control registers of the device, click the icon on the upper left corner, and select
“Registers” page option.
14 List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
Figure 4. Option to Select Register Control
This is the register control window selected by the page option.
15
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
Figure 5. TPS61177A GUI - Register Control Page
The I2C-compatible device address is fixed at 0x58 (8-bit, 2Ch for 7-bit) in this program. The checkbox
“Enable I2C Pullup” is used to enable internal pullup (3.3 V) of USB2ANY when I2C pullup on
TPS61177AEVM is not available. I2C clock speed can be also selected from 1 0kHz to 400 kHz and
default speed is set to 100 kHz. EN signal from USB2ANY can be inserted by checking “Enable Pin”
checkbox. This is a useful control by GUI when Vin is not used as EN input by JP1(pin 1 and 2). J18
should be closed in this case. Register table on the right side can show the current values of the registers.
Press “Read All” button to read back all the registers and the values will be updated on this table. If any
register values need to changed, simply double click on the individual bit values to change it in this table
or press “Write Register” button to write all the registers at a time if “Deferred” is selected instead of
“Immediate” from dropdown box. “Brightness PWM” checkbox can be used to generate PWM input to the
device by USB2ANY and J17 should be closed for this control. Vin can be also used as PWM input(100%)
when JP9 (pins 1 and 2) is closed.
The minimum procedure for turning on the LEDs is as follows:
1. Connect the LED board (user-designed or WLEDEVM-260 from TI) to the TPS61177AEVM evaluation
board. Set jumpers for number of LEDs per string.
2. Connect external power and ground to the board.
• Suggest 12 V to VIN jack.
• Connect ground to GND jack.
3. Run “C:\Program Files (x86)\Texas Instruments\TPS61177A\nw.exe" or desktop icon
“TPS61177AEVM”.
16 List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
4. Turn on the external supplies
5. Check the "Enable Pin" box if EN signal from USB2ANY is used. EN will be tied to VIN by default
jumper connector setting and the jumper to connect EN to VIN should be removed when EN signal
from USB2ANY is used before VIN is enabled.
6. Change brightness with external PWM signal source on pin 2 of JP9 or GUI control (100% by enabling
“PWM Enable” checkbox) with USB2ANY. PWM will be tied to VIN by default jumper connector setting
and the jumper (JP9) to connect PWM to VIN should be removed when PWM signal from USB2ANY is
used before VIN is enabled.
The default dimming mode is analog and PWM mixed mode. This including other controls such as ILED
max, boost SW freq/slew rate, and UVLO can be also controlled through S/W GUI. See the TPS61177A
data sheet (SNVSA76) for detailed descriptions of the registers and their usage.
NOTE: Do not change the configuration of the device while the backlight is enabled. First disable the
backlight by making sure "Enable Backlight" is unchecked. Then adjust the configuration and
turn on the backlight. Changing the configuration while the backlight is on may produce
unexpected results.
Register settings can be saved to “”*.json” file format by selecting “Save Registers” from file menu.
Register settings saved as “*.json” file format can be opened and programmed automatically by selecting
“Load Register” from file menu.
17
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Set-Up www.ti.com
Figure 6. Default Jumper Configuration
2.3 Instructions fo Stand-Alone Evaluation
The TPS61177A EVM can be used for TPS61177A standalone evaluation (without evaluation software) or
the evaluation with the software. Figure 7 shows the picture of the TPS61177A EVM board setup for the
standalone evaluation (LED load: WLEDEVM-260, not included in the kit).
18 List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Set-Up
Figure 7. TPS61177A EVM Test Setup for Standalone Evaluation
The minimum procedure for turning on the LEDs with PWM only is as follows:
• Connect external power(VIN) and ground to the board.
• Recommend connecting 12 V to J1. (Any valid VIN 2.7 V to 24 V : recommended boost conversion ratio
less than 10).
• Connect ground to J2.
• Connect an external PWM generator with levels 1.8 V or higher(but lower than VINB) with freq
between 0.1 kHz and 25 kHz to middle pin of JP9 or simply connect a jumper connector to JP9 to high
position(100% PWMB input)
• Check if EN input is at high position of JP1
• Turn on the external supplies.
2.4 Instructions for Evaluation With Software
The TPS61177A evaluation kit includes an I2C-compatible program and USB2ANY board that can help
exercise the part in a simple way. Contained in this document is a description of how to use the USB2ANY
board with the evaluation board and the interface software. Figure 8 shows the picture of the
TPS61177AEVM setup for the evaluation with software.
19
SNVU490–OCTOBER 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

TPS61177AEVM Component Placement www.ti.com
Figure 8. TPS61177A EVM Test Setup With USB2ANY Connected for Software Control
The USB2ANY Board can be connected to the TPS61177AEVM via J8 connector. The USB2ANY Board
provides all of the control signals for the simple interface. Power to the part must be provided externally. A
standard USB cable must be connected to the USB2ANY board from a PC. The default jumper connection
of JP1 (EN) and JP9 (PWM) can be removed to use software control to enable and light up the board. J17
and J18 should be connected for software control of EN and PWM. PWM signal from USB2ANY is just on
(100%) /off (0%) signal for simple bring-up test for the board.
3 TPS61177AEVM Component Placement
Figure 9shows the top PCB layer of the TPS61177A EVM.
20 List of Tables SNVU490–OCTOBER 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated