Using the TPS2556EVM-423 and
TPS2557EVM-423
User's Guide
Literature Number: SLUU393
November 2009
User's Guide
SLUU393 – November 2009
Using the TPS2556EVM-423 and TPS2557EVM-423
This user’s guide describes the TPS2556EVM-423 and TPS2557EVM-423 evaluation modules (EVM).
This guide contains the EVM schematic, list of materials, assembly drawing, and top and bottom board
layouts.
1
Introduction
The TPS2556EVM-423 and TPS2557EVM-423 are evaluation modules (EVM) for Texas Instruments’
power-distribution switches with adjustable current-limit. These EVMs operate over a 2.5-V to 6.5-V range.
An on-board jumper sets the output current-limit to either 0.5 A or 1 A. The board is designed for the 5-A
capability of the TPS2556 or TPS2557. Test points provide convenient access to all critical node voltages.
2
Description
The PCB top-side accepts a power-distribution switch in a SON-8 (DRB) package with a thermal pad.
These switches have an enable input, an over-current status output, and over-temperature shutdown. The
switches operate in current limit mode only.
TPS2556EVM-423 is enabled active lo. TPS2557 is enabled active hi.
2.1
Switches
Table 1. Switches
2
ENABLE
SWITCH POSITION
TPS2556
LO
TPS2557
HI
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Description
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2.2
Jumpers
Table 2. Jumpers
2.3
CURRENT
J2
0.1 A
ON
1.0 A
OFF
Test Points
Table 3. Test Points
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TEST POINT
PIN
TP1
VIN
TP1
EN
TP3
FLT
TP4
ILIM
TP5
VOUT
TP6
GND
TP7
GND
TP8
GND
TP9
GND
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3
Schematic
Schematic
+
+
3
www.ti.com
Figure 1. Schematic
4
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Getting Started
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4
Getting Started
Preset the power supply to 5 V and turn off. Connect the power supply output to the input terminals of the
HPA423.
Slide S1 to disable the TPS2556 or TPS2557. Turn on the power supply to apply 5.0 V to the EVM
input-power terminals. VOUT should be 0 V.
Slide S1 to enable the device. For TPS2556, set S1 to LO; for TPS2557, set S1 to HI. VOUT should be
VIN + / - 0.3 V.
Set the oscilloscope to auto trigger mode and the horizontal-sweep to 4 ms/div. Set all vertical channels
for 2 V/div except the current probe set for 200 mA/div
4.1
Monitor
1.
2.
3.
4.
4.2
Input voltage at TP1
Output voltage at TP5
EVM input current
FAULT# status voltage at test point TP3
Verify EVM Output
1. Set the scope for normal trigger, single sweep. Trigger on VOUT, negative slope at about a 3.5-V level.
2. Momentarily short the output connector. A sample scope trace is shown in . Observe VOUT drops to 0
V
3. Input current rises to an amplitude of 400 mA + / - 50 mA, within 0 to 4 ms after VOUT low.
4. FAULT signal is low 2 ms to 20 ms after VOUT low.
5
Performace Data and Characteristics Curves
Figure 2. 100-kΩ RILIM Enabled Into a Short Circuit
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EVM Assembly Drawing and PCB Layout
6
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EVM Assembly Drawing and PCB Layout
Figure 3. Top Layer Assembly (top view)
Figure 4. Top Copper (top view)
6
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EVM Assembly Drawing and PCB Layout
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Figure 5. Bottom Copper (top view)
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List of Materials
7
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List of Materials
Table 4. List of Materials
8
-002
-001
REF DES
DESCRIPTION
PART NUMBER
MFR
1
1
C1
Capacitor, ceramic, X7R, 10 V, 10%, 10 µF, 1206
STD
STD
2
2
C2, C3
Capacitor, ceramic, 16 V, X7R, 10%, 0.1 µF, 0805
STD
STD
C4
Capacitor, tantalum, 10 V, 100 mΩ, 10%, 150 µF,
7343 (D)
B45197A2157K409 KEMET
C5
Capacitor, tantalum, 10 V, 100 mΩ, 10%, 150 µF,
7343 (D)
B45197A2157K409 KEMET
J1, J3
Terminal block, 2 pin, 6 A, 3.5 mm, 0.27 inch x
0.25 inch
ED555/2DS
OST
J2
Header, male 2 pin, 100-mil spacing, 0.100 inch x
2 inch
PEC02SAAN
Sullins
1
1
0
0
2
2
1
1
2
2
R1, R2
Resistor, chip, 1/10 W, 1%, 10 kΩ, 0805
STD
STD
2
2
R3
Resistor, chip, 1/10 W, 1%, 24.9 kΩ, 0805
STD
STD
1
1
R4
Resistor, chip, 1/10 W, 1%, 75 kΩ, 0805
STD
STD
S1
Switch, SPDT, slide, PC-mount, 500 mA, 0.457
inch x 0.157 inch
EG1218
E-SWITCH
1
1
Test point, white, thru hole color keyed, 0.100 x
0.100 inch
Keystone
5
TP1, TP2,
TP3, TP4,
TP5
5002
5
4
4
TP6, TP7,
TP8, TP9
Test point, SM, 0.150 x 0.090, 0.185 inch x 0.135
inch
5016
Keystone
0
1
U1
Current-Limited, Power-Distribution Switches, DRB
TPS2556DRB
TI
1
0
U1
Current-Limited, Power-Distribution Switches, DRB
TPS2557DRB
TI
1
1
PCB, 2.25 inch x 2.22 inch x 0.062 inch
HPA423
Any
1
1
Shunt, 100 mil, black, 0.100
929950-00
3M
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List of Materials
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY
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take any and all appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER
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TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of
patents or services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the
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FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and
can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15
of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this
equipment in other 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.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.5 VDC to 6.23 VDC and the output current of 5 A .
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI 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 100 °C. The EVM is designed to
operate properly with certain components above 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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
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