User's Guide
SLVU462 – June 2011
TPS2554 and TPS2555 Evaluation Module
This user’s guide describes the evaluation module (EVM) for the TPS2554 and TPS2555. TPS2554 and
TPS2555 are precision-adjustable, current-limited, power-distribution switches. The document contains an
operational description of the EVM, schematic, board layout, and bill of materials.
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Contents
Description ...................................................................................................................
1.1
Features .............................................................................................................
1.2
Applications .........................................................................................................
Schematic ....................................................................................................................
General Configuration and Description ..................................................................................
3.1
Physical Access ....................................................................................................
3.2
Current-Limit Setpoint .............................................................................................
3.3
Test Setup ..........................................................................................................
EVM Assembly Drawings and Layout Guidelines ......................................................................
4.1
Layout Guidelines ..................................................................................................
4.2
PCB Drawings ......................................................................................................
Bill of Materials ..............................................................................................................
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List of Figures
1
TPS2554/5EVM Schematic ................................................................................................ 3
2
Typical TPS2554/5EVM Test Setup ...................................................................................... 5
3
Top-Side Placement and Routing......................................................................................... 6
4
Layer-Two Routing .......................................................................................................... 6
5
Layer-Three Routing ........................................................................................................ 7
6
Bottom-Side Placement and Routing ..................................................................................... 7
List of Tables
...............................................................................................................
1
User Interface
2
Test Points ................................................................................................................... 4
3
EVM Bill of Materials
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Description
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Description
The TPS2554EVM-010 evaluation module allows reference circuit evaluation of the Texas Instruments
TPS2554 and TPS2555 power-distribution switches.
1.1
Features
•
•
•
•
1.2
Applications
•
•
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Precision adjustable, current-limited, power-distribution switch
Fast overcurrent response – 1 µs typical
80-mΩ, high-side MOSFET
Operating range: 4.5 V to 5.5 V
USB ports/hubs
Notebook personal computers (PC)
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Schematic
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2
Schematic
Figure 1. TPS2554/5EVM Schematic
spacer
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General Configuration and Description
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3
General Configuration and Description
3.1
Physical Access
Table 1 lists the TPS2554/5EVM connector functionality, and Table 2 describes the test point availability.
Table 1. User Interface
Connector
Label
J1
VIN
Description
J2
VOUT
J3
J3
Input voltage jumper. Shunt can be removed to measure input current.
J4
J4
Output voltage jumper. Shunt can be removed to measure output current.
J5
EN
Enable jumper. Leave open to enable TPS2554 and install shunt to enable TPS2555.
J6
ILIM_SEL
Current limit select. Install shunt to select ILIM0 (2.4 A nominal), and remove shunt to
select ILIM1 (1.2 A nominal).
D1 (RED)
FLT
Input connector
Output connector
Fault LED
Table 2. Test Points
3.2
Test Point
Color
Label
TP3
RED
IN
Description
TP4
BLK
GND
Power switch input ground
TP1
WHT
FLT
Fault pin output
TP2
RED
VOUT
Power switch output
TP5
BLK
GND
Power switch output ground
TP6
WHT
EN
Power switch input (IC side of J3 shunt)
Enable pin input
Current-Limit Setpoint
R4 and R5 configure the current-limit setpoint for ILIM0 and ILIM1, respectively (see J6 in Table 1). ILIM0
or ILIM1 setpoint can be adjusted using the following example by substituting R4 or R5 for RILIMx. In this
example IOS = 2 A.
The following example is an approximation only and does not take into account the resistor tolerance or
the variation of ILIM. For exact variation of ILIM, see the TPS2554/TPS2555 data sheet, SLVSAM0.
IOS = 48000 / RILIMx = 2 A
RILIMx = 48000 / IOS = 48000 / 2 = 24000 Ω
Choose RILIMx = 23.7 kΩ
IOS = 48000 / 23700 = 2.03 A
3.3
Test Setup
Figure 2 shows a typical test setup for TPS2554/5EVM.
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EVM Assembly Drawings and Layout Guidelines
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Oscilloscope
TP2
+
+
D1
TPS2554EVM-010
J2
-
J1
7" Twisted Pair, #20AWG
-
VIN
TP5
Figure 2. Typical TPS2554/5EVM Test Setup
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EVM Assembly Drawings and Layout Guidelines
4.1
Layout Guidelines
•
•
•
4.2
TPS2554/55 placement: Place the TPS2554/55 near the USB output connector and the 150-µF OUT
pin filter capacitor. Connect the exposed pad to the GND pin and the system ground plane using a via
array.
IN pin bypass capacitance: Place the 100-nF bypass capacitor near the IN and GND pins, and make
the connection using a low-inductance trace.
ILIM0 and ILIM1 pin connections: Current-limit accuracy can be compromised by stray current
leakage from a higher voltage source to the ILIM0 or ILIM1 pins. Ensure that adequate spacing exists
between IN pin copper/trace and ILIM0 pin trace to prevent contaminate buildup during the PCB
assembly process. If a low-current-limit setpoint is required (RILIMx > 200 kΩ), use ILIM1 for this case,
as it is further away from the IN pin.
PCB Drawings
The Figure 3 through Figure 6 show component placement and layout of the EVM.
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EVM Assembly Drawings and Layout Guidelines
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TP3
TP1
D1
R1
J3
U1
C2
J4
J2
1
J1
TP2
+
C1
R3
R2
R4 R5
TP4
J6
J5
TP6
TP5
C3
Figure 3. Top-Side Placement and Routing
Figure 4. Layer-Two Routing
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EVM Assembly Drawings and Layout Guidelines
Figure 5. Layer-Three Routing
Figure 6. Bottom-Side Placement and Routing
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Bill of Materials
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Bill of Materials
Table 3. EVM Bill of Materials
Count
RefDes
Value
Description
Size
Part Number
Mfr
1
C2
0.1 µF
Capacitor, Ceramic, 16V, X7R, 10%
603
Std
Std
1
C1
10 µF
Capacitor, Ceramic, 10V, X5R, 10%
1206
Std
Std
1
C3
150 µF
Capacitor, Tant, Low ESR, 10V, ±10%
7343(D)
TPSD157K010R0100
AVX
1
D1
LN1271R
Diode, LED, Red, 20-mA, 0.9-mcd
0.068 x 0.049 inch
LN1271R
Panasonic
4
J3-6
PEC02SAAN
Header, Male 2-pin, 100mil spacing,
0.100 inch x 2
PEC02SAAN
Sullins
2
R2-3
100k
Resistor, Chip, 1/16W, 1%
603
Std
Std
1
R4
40.2k
Resistor, Chip, 1/16W, 1%
603
Std
Std
1
R5
20k
Resistor, Chip, 1/16W, 1%
603
Std
Std
1
R1
499
Resistor, Chip, 1/10W, 1%
805
Std
Std
2
J1-2
ED555/2DS
Terminal Block, 2-pin, 6-A, 3.5mm
0.27 x 0.25 inch
ED555/2DS
OST
2
TP2-3
5010
Test Point, Red, Thru Hole
0.125 x 0.125 inch
5010
Keystone
2
TP4-5
5011
Test Point, Black, Thru Hole
0.125 x 0.125 inch
5011
Keystone
2
TP1 TP6
5012
Test Point, White, Thru Hole
0.125 x 0.125 inch
5012
Keystone
1
U1
TPS2554DRC or
TPS2555DRC
IC, Power-Distribution Switch, Current-Limited
SON
TPS2554DRC or
TPS2555DRC
TI
SJ-5003
BUMPON HEMISPHERE .44X.20 BLACK
SJ-5003
3M
929950-00
3M
PWR010
Any
4
2
1
8
Shunt, Black
—
100-mil
PCB, 2.5 In x 2.0 In x 0.062 In
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Copyright © 2011, Texas Instruments Incorporated
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
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 0 V to 5.5 V and the output voltage range of 0 V to 5.5 V .
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 85°C. The EVM is designed to
operate properly with certain components above 85°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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