Texas Instruments TPS61165EVM-283 User manual

User's Guide
SLVU224C–January 2008–Revised February 2010
TPS61165EVM-283
This user's guide describes the characteristics, operation, and use of the TPS61165EVM-283 evaluation
module (EVM). This EVM contains the Texas Instruments TPS61165 boost converter, configured with
external components to regulate current through a string of WLEDs. This user's guide includes EVM
specifications, recommended test setup, test results, bill of materials, and a schematic diagram.
Contents
1 Introduction .................................................................................................................. 2
2 Setup and Test Results .................................................................................................... 2
3 Board Layout ................................................................................................................ 6
4 Schematics and Bill of Materials .......................................................................................... 9
List of Figures
1 USB Interface Adapter Quick Connection Diagram .................................................................... 4
2 Screen Capture of TPS6116x Controller Software GUI Interface .................................................... 6
3 LED Efficiency vs Output Current......................................................................................... 6
4 Assembly Layer ............................................................................................................. 7
5 Top-Side Layer.............................................................................................................. 8
6 Bottom-Side Layer.......................................................................................................... 9
List of Tables
1 Typical Performance Specification Summary ........................................................................... 2
2 HPA283 Bill of Materials.................................................................................................. 10
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R2
VVVV-V
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LED
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Introduction www.ti.com
1 Introduction
The Texas Instruments TPS61165EVM-283 evaluation module contains a TPS61165 IC, supporting active
and passive components and three white light-emitting diodes (WLEDs) in series. The goal of this EVM is
to facilitate evaluation of the TPS61165 in a typical WLED application.
1.1 Performance Specification Summary
Table 1 provides a summary of the TPS61165EVM-283 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. Typical Performance Specification Summary
CONDITION MIN TYP MAX UNITS
VIN supply 4.5 5 5.5 V
CTRL=VIN, JP2 shorted 9.5 V
VOUT CTRL=VIN, JP2 open 37 38 39 V
IOUT CTRL=VIN, JP2 shorted 347 357 368 mA
The EVM was designed and tested for an input voltage of 5 V +/-10%. Lower input voltages may result in
the part entering current limit and therefore not providing the regulated current in the specification table.
Input voltages greater than the drop across the sum of D2-D4 but less than the 18-V maximum do not
damage the IC but cause the IC to stop switching and regulating current. At this time, the input voltage,
less the drop across D1, is applied across D2-D4, setting the current to that as shown in Equation 1.
(1)
Currents higher than the LEDs' 500-mA maximum rating can damage the LEDs.
1.2 Modifications
To aid user customization of the EVM, the board was designed with devices having 0603 or larger
footprints. A real world implementation would likely occupy less total board space.
The inductor and compensation components (R1, C2) were designed for the VIN range in Table 1. Using
a different input voltage range may require resizing of the inductor and/or the compensation components.
Also, changing components can improve or degrade EVM performance. For example, using inductors with
larger dc resistances lowers efficiency of the solution.
The other members of the TPS6116x IC family have the same footprint. Therefore, the TPS61165 IC may
be replaced on the TPS61165EVM-283 PCB with either the TPS61160 or TPS61161.
NOTE: When modifying the REV A version of this PCB, it is strongly recommended that you heat
the PCB on a hot plate before using a soldering iron to remove/replace components,
especially the input capacitor and inductor. Otherwise, the expansion when soldering and
contraction when cooling of the wide traces/places connecting these components to the IC
pins can damage the IC. For further explanation and guidance, see the TI application report
QFN/SON PCB Attachment SLUA271.
2 Setup and Test Results
2.1 Input/Output Connections
The connection points are described in the following paragraphs.
EasyScale is a trademark of Texas Instruments.
Windows is a trademark of Microsoft Corporation.
VeriSign is a trademark of VeriSign, Inc.
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www.ti.com 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 VIN, 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)
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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 www.ti.com
• 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
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www.ti.com Setup and Test Results
2.4 Software Installation and Operation
If installing from a CD, insert the CD and run Setup.exe; follow all the prompts to install the software.
If installing from the TI Web site, go to the URL,
http://focus.ti.com/en/download/aap/DesignEnv/TPS6116XEVM-SW/publish.htm.
NOTE: This installation page is best viewed with Microsoft Internet Explorer browser (It may not
work correctly with other browsers)
Click on the install button; your PC gives you a security warning and asks if you want to install this
application. Select Install to proceed. If a pre-release or Beta version is currently installed on your PC, you
must uninstall this version of the software before installing the final version from either the CD or the TI
Web site.
With both types of installation, the software attempts to install the Microsoft Dot Net Framework 2.0 (if it is
not already installed) This framework is required for the software to run.
Immediately following installation, the software automatically runs.
To run the software after installation, go to
Start →all programs →Texas Instruments, Inc. →TPS6116x Controller EVM Software.
At start-up, the software first checks the firmware version of the USB-TO-GPIO adapter box. If an incorrect
firmware version is installed, the software automatically searches on the Internet (if connected) for
updates. If a new update is available, the software notifies the user of the update, downloads and installs
the software. Note that after the firmware is updated, the user must disconnect and then reconnect the
USB cable between the adapter and PC, as instructed during the install process. The host PC software
also automatically searches on the Internet (if connected) for updates. If a new update is available, the
software notifies the user of the update, downloads, and installs it.
NOTE: VeriSign™ Code Signing is used to prevent any malicious code from changing this
application. If at any time in the future the binaries are modified, the code no longer attempts
to run.
The TPS6116x IC has a 5-bit register that stores the feedback voltage to which the error amplifier
regulates the FB pin. Using the EasyScale™ protocol, the user can program a separate digital IC to
generate a signal that changes this register to one of 32 discrete settings, thereby changing the FB
voltage and subsequent regulated WLED current. The software provides a GUI interface which allows the
user to change the bits directly or by a drop-down box. After changing the bits, press the WRITE button.
See a screen shot of the software in Figure 2.
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40
50
60
70
80
90
100
10 60 110 160 210 260 310 360
I - Output Current - mA
O
Efficiency - %
Board Layout www.ti.com
Figure 2. Screen Capture of TPS6116x Controller Software GUI Interface
2.5 Test Results
This section provides typical performance characteristics for the TPS61165EVM-283 board.
Figure 3. LED Efficiency vs Output Current
3 Board Layout
This section provides the TPS61165EVM-283 board layout and illustrations.
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Caution: Bright WLEDS
www.ti.com Board Layout
Board layout is critical for all high-frequency, switch-mode power supplies. Figure 4 through Figure 6 show
the board layout for the TPS61165EVM-283 printed circuit board (PCB). The nodes with high-switching
frequencies and currents are kept as short as possible to minimize trace inductance. Careful attention was
given to the routing of high-frequency current loops and a single-point grounding scheme is used. See the
data sheet for specific layout guidelines.
Figure 4. Assembly Layer
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Board Layout www.ti.com
Figure 5. Top-Side Layer
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www.ti.com Schematics and Bill of Materials
Figure 6. Bottom-Side Layer
4 Schematics and Bill of Materials
This section provides the TPS61165EVM-283 schematic and bill of materials. The EVM was designed and
tested assuming the input voltage is 5 V ±10%. Lower input voltages may result in the part entering
current limit and therefore not providing the regulated current in the specification table. Input voltages
greater than the drop across the sum of D2-D4 but less than the 18-V maximum does not damage the IC
but causes the IC to stop switching and regulating current. At this time, the input voltage, less the drop
across D1, is applied across D2-D4, potentially damaging the diodes.
9
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1
1
1
1
Schematics and Bill of Materials www.ti.com
4.1 TPS61165EVM-283 Schematic
4.2 Bill of Materials
Table 2. HPA283 Bill of Materials
Count RefDes Value Description Size Part Number MFR
1 C1 4.7 mF Capacitor, Ceramic, 25V, X5R, 10% 0805 TMK212BJ475KG-T Taiyo
Yuden
1 C2 0.22 mF Capacitor, Ceramic, 10V, X5R, 10% 0603 C1608X5R1A224K TDK
1 C3 1.0 mF Capacitor, Ceramic, 50V, X7R, 10% 1206 C3216X7R1H105K TDK
0 C4 Open Capacitor, Ceramic 1210 Std Vishay
0 C5 Open Capacitor, Ceramic 0603 Std Vishay
1 D1 MBR0540T1 Diode, Schottky, 500-mA, 40-V SOD123 MBR0540T1 OnSemi
3 D2, D3, D4 LW W5SM-HYJZ-5K8L-Z Diode, LED White, 500-mA, 0.244 × 0.441 inch LW W5SM-HYJZ-5K8L-Z Osram
LW W5SM-JXJY-5K8L-Z 17000-mcd LW W5SM-JXJY-5K8L-Z
LW W5SM-JXJZ-5K8L-Z LW W5SM-JXJZ-5K8L-Z
(see Note 5) (see Note 5)
5 J1, J2, J3, J4, PEC02SAAN Header, 2 pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins
J6
1 J5 2510-6002UB Connector, Male Straight 2×5 pin, 0.338 × 0.788 inch 2510-6002UB 3M
100mil spacing, 4 Wall
2 JP1, JP2 PEC02SAAN Header, 2 pin, 100mil spacing 0.100 inch × 2 PEC02SAAN Sullins
1 L1 10 mH Inductor, 67 mΩ, ±20% 0.205 x 0.205 inch A915AY-100M Toko
1 R1 0 Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R2 0.56 Resistor, Chip, 1/8W, 1% 0805 Std Std
1 R3 1.82k Resistor, Chip, 1/16W, 1% 0603
0 R4 Open Resistor, Chip, 1/16W, 1% 0603
1 U1 TPS61165DRV IC, 1200KHz/1.2A PWM SON-6 TPS61165DRV TI
1 — PCB, 2.42 In × 2.81 In × 0.062 In HPA283 Any
2 — Shunt, 100 mil, Black 0.100 929950-00 3M
Notes: 1. These assemblies are ESD sensitive, ESD precautions shall be observed.
2. These assemblies must be clean and free from flux and all contaminants.
Failure to use clean flux is unacceptable.
3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
4. Reference designators marked with an asterisk ('**') cannot be substituted.
All other components can be substituted with equivalent MFG's components.
5. D2, D3, D4 can be any LW W5SM. The last eight characters of the orderable number are don't cares.
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