User’s Guide
July 2004
PMP Portable Power Products
SBVU008
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EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
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Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
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Copyright 2004, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 0 V and 7 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
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field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
+25°C. The EVM is designed to operate properly with certain components above +25°C as
long as the input and output ranges are maintained. These components include but are not
limited to linear regulators, switching transistors, pass transistors, and current sense
resistors. These types of devices can be identified using the EVM schematic located in the
EVM User’s Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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Post Office Box 655303
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Copyright 2004, Texas Instruments Incorporated
About This Manual
This user’s guide provides the information needed to set up and operate the
TPS60230EVM-047 evaluation module. For a more detailed description of the
TPS60230, please refer to the product data sheet available from the Texas In struments web site at http://www.ti.com
listed in the sections of this guide entitled Related Documentation from Texas
Instruments.
How to Use This Manual
Throughout this document, the acronym EVM and the phrase evaluation
module are synonymous with the TPS60230EVM−047.
Preface
Read This First
. Additional support documents are
Related Documentation From Texas Instruments
The following document(s) provide information regarding Texas Instrument integrated circuits used in the assembly of the TPS60230EVM−047. These documents are available from the TI web site. The last character of the literature
number corresponds to the document revision, which is current at the time of
the writing of this user’s guide. Newer revisions may be available from the TI
web site at http://www.ti.com
sponse Center at (800) 477−8924 or the Product Information Center at (972)
644−5580. When ordering, identify the document(s) by both title and literature
number.
Data Sheets: Literature Number:
TPS60230 SLVS516
or by calling the Texas Instruments Literature Re-
Contents
If You Need Assistance
If you have questions regarding either the use of this evaluation module or the
information contained in the accompanying documentation, please contact
your local TI sales representative, the Texas Instruments Product Information
Center at (972) 644−5580, or visit the TI Semiconductor Online Technical Support pages at http://www.ti.com
FCC Warning
This equipment is intended for use in a laboratory test environment only. It may
generate, use, or radiate radio frequency energy and has not been tested for
compliance with the limits of computing devices pursuant to sub−part J of part
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environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
Trademarks
.
All trademarks are the property of their respective owners.
iv
TPS60230EVMĆ047
This user’s guide describes the characteristics, operation, and use of the
TPS60230EVM-047 LED charge-pump current-source evaluation module
(EVM). This EVM features a high-efficiency charge-pump-based white LED
driver designed to operate off a single cell Li-Ion battery and drive up to five
white LEDs with up to 20mA each. This user’s guide includes setup
instructions, test results, a schematic diagram, a bill of materials (BOM), and
printed circuit board (PCB) layout drawings for the evaluation module.
Topic Page
1 Introduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Initial Configuration 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Printed Circuit Board (PCB) Layout 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Schematic 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Bill of Materials 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPS60230EVM-047
1
Introduction
1 Introduction
The Texas Instruments TPS60230EVM-047 evaluation module (EVM) helps
designers evaluate the operation and performance of the TPS60230. This device is an efficient charge-pump-based current sink that can drive up to five
white LEDs with 25mA each. Efficiency is improved by switching between a
1.0x and 1.5x mode, based on the input voltage.
This EVM is specifically designed and optimized to operate with a single-cell
Li-Ion battery input. The default maximum current setting for this EVM is 20mA
per LED. If desired, this EVM can easily be modified to supply higher or lower
currents by appropriately selecting the ISET resistor, R1. Refer to the data
sheet (SLVS516) for more information on adjusting the LED current.
2 Initial Configuration
This section describes the jumpers and connectors on the EVM, as well as how
to properly connect, set up, and use the TPS60230EVM-047.
2.1 Input/Output Connector Descriptions
2.1.1 J1: VIN
2.1.2 J2: GND
2.1.3 JP1: EN2
2.1.4 JP2: EN1
This is the positive connection to the input power supply or battery.
This is the return connection for the input power supply or battery.
This jumper will ground the EN2 pin or connect it to VIN. If the both EN1 and
EN2 are connected to VIN, the LED current will be the full programmed value
set by R1. For this EVM, that current is 20mA. If EN2 is connected to ground
and EN1 is high, the LED current will be set to 1/3 the programmed value, or
6.66mA. If both EN1 and EN2 are grounded, the LEDs will turn off.
This jumper will ground the EN1 pin or connect it to VIN. If the both EN1 and
EN2 are connected to VIN, the LED current will be the full programmed value
set by R1. For this EVM, that current is 20mA. If EN1 is connected to ground
and EN2 is high, the LED current will be set to 2/3 the programmed value, or
13.33mA. If both EN1 and EN2 are grounded, the LEDs will turn off.
2
2.2 Setup
Connect an input supply or battery between J1 and J2. The voltage range on
this supply should stay between 2.7V and 6.0V. Set the appropriate brightness
by configuring JP1 and JP2.
2.3 Operation
The EVM has been optimized to operate from a single-cell Li-Ion battery with
an input voltage range of 2.7V to 6.0V. The value for R1 programs the maximum LED current. For this EVM, the maximum current is set to 20mA. However, by changing the value of R1, LED currents up to 25mA can be achieved.
Currents less than 20mA can be achieved by appropriately configuring JP1
and JP2, as shown in Table 1.
Table 1. Relative LED Current Levels
JP1 (EN2) JP2 (EN1) LED CURRENT
0 0 0
0 1 1/3 full
1 0 2/3 full
1 1 Full (20mA for R1 = 7.87kΩ)
Input/Output Connector Descriptions
EN1 and EN2 can also be used for pulse width modulator (PWM) dimming.
The PWM signal can be applied to EN1, EN2, or both. In this case, the LED
current is proportional to duty factor and can have a maximum current dictated
by how EN1 and EN2 are configured. The maximum recommended PWM frequency is 50kHz, and the minimum recommended ON time is 2.5us. Refer to
the datasheet (SLVS516) for more information in regards to PWM dimming.
2.4 Test Results
The efficiency curve in Figure 1 reflects the power delivered to the LED. The
output power used for the efficiency calculation is the sum of all the LED currents multiplied by the LED forward voltage.
Figure 1. Efficiency vs VIN
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 5.9 6.3 6.5
Input Voltage (V)
EN2 and EN1 = On
=20mA
I
LED
TPS60230EVM-047
3
Printed Circuit Board (PCB) Layout
3 Printed Circuit Board (PCB) Layout
PCB layout is critical for all switch-mode power supplies. Figure 2, Figure 3,
and Figure 4 show the board layout for the TPS60230EVM-047 PWB. The
nodes with high switching frequencies and currents are short and are isolated
from the noise-sensitive feedback circuitry. Careful attention has been given
to the routing of high-frequency current loops. Refer to the product datasheet
(SLVS516) for specific layout guidelines.
Figure 2. Assembly Layer
Figure 3. Top Layer Routing
Figure 4. Bottom Layer Routing
4
4 Schematic
Figure 5. TPS60230EVM−047 Schematic
Schematic
5 Bill of Materials
Table 2. Bill of Materials
Qty Ref Des Description Size Mfr Part Number
2 C1, C4 Capacitor, ceramic, 1.0µF, 6.3V,
X5R, 10%
2 C2, C3 Capacitor, ceramic, 0.47µF, 10V,
X5R, 10%
5 D1 − D5 Diode, LED, White, 30mA 1210 Lumex SML−LX2832UWC−TR
2 J1, J2 Header, 2-pin, 100mil spacing,
(36-pin strip)
2 JP1, JP2 Header, 3-pin, 100mil spacing,
(36-pin strip)
1 R1 Resistor, chip, 7.87kΩ, 1/16W, 1% 603 Std Std
1 U1 IC, white LED charge pump current
source
1 −− PCB, 1.55 in x 1.195 in x 0.062 in Any HPA047
2 −− Shunt, 100mil, black 0.100 3M 929950−00
603 TDK C1608X5R0J105KT
603 TDK C1608X5R1A474KT
0.100 x 2 Sullins PTC36SAAN
0.100 x 3 Sullins PTC36SAAN
0.80 x 0.80 TI TPS60230RGT
TPS60230EVM-047
5
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