User's Guide
SLVU199A – March 2007 – Revised June 2007
TPS2041B/51B EVM Power-Distribution Switch
This User’s Guide describes the characteristics, operation, and use of TPS2041B/51B
evaluation modules (EVM) featuring the Texas Instruments TPS2041/51B in the
SOT-23 package.
1
2
3
4
Contents
Introduction ..........................................................................................
Setup .................................................................................................
Board Layout ........................................................................................
Bill of Materials and Schematics ..................................................................
1
1
4
6
List of Figures
1
2
3
4
5
6
7
8
9
Disabled Device at Power Up .....................................................................
Enabling the Device ................................................................................
Overcurrent Mode ..................................................................................
Top-Side Layout of TPS2041B EVM .............................................................
Bottom-Side Layout of TPS2041B EVM .........................................................
Top-Side Layout of TPS2051B EVM .............................................................
Bottom-Side Layout of TPS2051B EVM .........................................................
TPS2041B EVM Schematic .......................................................................
TPS2051B EVM Schematic .......................................................................
3
3
4
4
5
5
6
7
8
List of Tables
1
2
1
TPS2041B EVM BOM
TPS2051B EVM BOM
.............................................................................
.............................................................................
6
7
Introduction
These EVMs provide a means for the user to evaluate quickly the functionality and electrical performance
of the TPS2041B/51B. All inputs and outputs are brought out to test points for control and monitoring. All
passive components are included on the EVM for device operation. The input pin should be connected to
an external supply; the output should be connected to a load. The device can be enabled/disabled through
the enable pin. Faults can be monitored by observing the OC_ pin.
1.1
Related Documentation From Texas Instruments
TPS204xB/TPS205xB Current-Limited, Power-Distribution Switches data sheet (SLVS514)
2
Setup
2.1
Input/Output Connector Descriptions
This chapter describes each test point and how to properly connect, set up, and use the TPS2041B/51B
EVM.
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Setup
2.1.1
TP1 – Output Power
This is the output of the DC/DC power supply. Connect a load between the two terminals of this test point
with reference to one of the ground points.
2.1.2
TP2, TP7, TP8, TP9 – Ground
Any of these test points can be used as references to the input, output, and oscilloscope probes.
2.1.3
TP3 – Overcurrent
When the output load exceeds the current-limit threshold or a short is present, the device limits the output
current to a safe level by switching into a constant-current mode, pulling the overcurrent logic output low.
2.1.4
TP4 – Input Power
Apply the input voltage here. Recommended range is 2.7 V to 5.5 V. Note that 6 V is the absolute
maximum and –0.3 V is the absolute minimum, so it is extremely important not to exceed these limits.
2.1.5
TP5 – Enable
The enable input is active-low for the TPS2041B and active-high for the TPS2051B. To turn the
TPS2041B on, this point must be tied to a low potential. To turn the TPS2051B on, this point must be tied
to a high potential. The negative terminal (active-low) and the positive terminal (active-high) of the power
supply are recommended points.
2.2
Electrical Specifications
Parameters
Vin
Input voltage
Io(out)
Continuous output
current
Rdson
2.3
Test Conditions
Min
VI(IN) = 5 V or 3.3 V, IO = 0.5 A, –40°C ≤ TJ≤ 125°C
Max
Unit
2.7
Typ
5.5
V
0
500
mA
140
mΩ
95
Test Results
The figures in this section come from testing the TPS2041B EVM, which has an active-low enable.
2
TPS2041B/51B EVM Power-Distribution Switch
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Setup
2.3.1
Apply Power to EVM While Disabled
Figure 1 shows the input (Ch. 1, 5 V/div), output (Ch. 2, 5 V/div), overcurrent (Ch. 3, 5 V/div), and the
enable input (Ch. 4, 5 V/div). Because enable is in a logic-high state, 0 volts is observed at the output.
G001
Figure 1. Disabled Device at Power Up
2.3.2
EVM Is Enabled
Figure 2 shows the enable input toggled from a logic-high (Ch. 4) to a logic-low state. When this occurs,
the output shoots up to 5 V (Ch. 2).
G002
Figure 2. Enabling the Device
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Board Layout
Figure 3 shows the overcurrent signal (Ch. 3) pulling low due to a short circuit on the output. The device
switches into a constant-current mode and shuts off the switch, so 0 V is seen on the output (Ch 2).
G003
Figure 3. Overcurrent Mode
3
Board Layout
This chapter provides the TPS2041B EVM and TPS2051B EVM board layouts and illustrations.
K001
Figure 4. Top-Side Layout of TPS2041B EVM
4
TPS2041B/51B EVM Power-Distribution Switch
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Board Layout
K002
Figure 5. Bottom-Side Layout of TPS2041B EVM
K003
Figure 6. Top-Side Layout of TPS2051B EVM
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Bill of Materials and Schematics
K004
Figure 7. Bottom-Side Layout of TPS2051B EVM
3.1
Layout Considerations
1. All leads should be as short as possible with wide traces.
2. Pair signals to reduce emissions and noise, especially the paths that carry high-current pulses; these
include paths to power semiconductors and magnetics.
3. Reduce the length of all the traces in described step 2.
4. Where possible, use vertical pairing.
4
Bill of Materials and Schematics
This chapter provides the Bill of Materials and Schematics for the TPS2041B/51B EVMs.
4.1
Bill of Materials
4.1.1
TPS2041B EVM BOM
Table 1 is the Bill of Materials for the TPS2041B EVM.
Table 1. TPS2041B EVM BOM
RefDes
C1
C2, C3
C4
R1
TP1, TP3, TP4, TP5
TP2, TP7, TP8, TP9
U1
–
NOTES:
6
Count
1
2
1
1
4
4
1
1
Size
SMD
0805
1206
0805
TH
TH
SOT-23-5
Mfr
STD
STD
STD
STD
Keystone
Keystone
TI
Any
Part Number
STD
STD
STD
STD
5000
5001
TPS2041BDBV
HPA228
Description
Capacitor, tantalum, 150-µF, 10-V, 100-mΩ, 20%
Capacitor, ceramic, 0.1-µF, 10-V, 20%
Capacitor, ceramic, 10-µF, 10-V, 20%
Resistor, chip, 10-kΩ, 1/10W, 5%
Test point, red, thru hole, color keyed
Test point, black, thru hole, color keyed
IC, 80-mΩ, 500-mA power-distribution single switch
PCB, 1 in. × 0.8 in. x 0.062 in. (2,54 cm × 2,03 cm × 1,58 mm)
1. These assemblies are ESD sensitive; ESD precautions must be observed.
2. These assemblies must be clean and free from flux and all contaminants. Use of no-clean flux is not acceptable.
3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
TPS2041B/51B EVM Power-Distribution Switch
SLVU199A – March 2007 – Revised June 2007
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Bill of Materials and Schematics
4.1.2
TPS2051B EVM BOM
Table 2 is the Bill of Materials for the TPS2051B EVM.
Table 2. TPS2051B EVM BOM
RefDes
C1
C2, C3
C4
R1
TP1, TP3, TP4, TP5
TP2, TP7, TP8, TP9
U1
–
NOTES:
4.2
Count
1
2
1
1
4
4
1
1
Size
SMD
0805
1206
0805
TH
TH
SOT-23-5
Mfr
STD
STD
STD
STD
Keystone
Keystone
TI
Any
Part Number
STD
STD
STD
STD
5000
5001
TPS2051BDBV
HPA240
Description
Capacitor, tantalum, 150-µF, 10-V, 100-mΩ, 20%
Capacitor, ceramic, 0.1-µF, 10-V, 20%
Capacitor, ceramic, 10-µF, 10-V, 20%
Resistor, chip, 10-kΩ, 1/10W, 5%
Test point, red, thru hole, color keyed
Test point, black, thru hole, color keyed
IC, 80-mΩ, 500-mA power-distribution single switch
PCB, 1 in. × 0.8 in. x 0.062 in. (2,54 cm × 2,03 cm × 1,58 mm)
1. These assemblies are ESD sensitive; ESD precautions must be observed.
2. These assemblies must be clean and free from flux and all contaminants. Use of no-clean flux is not acceptable.
3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
Schematics
TP3
OC
TP5
EN
U1
TPS2041BDBV
R1
10 kW
TP7
4
TP4
EN
OC
GND
IN
5V
5
IN
OUT
TP2
GND
3
2
1
TP1
C4
10 mF
OUT
5 V @ 500 mA
C3
0.1 mF
TP9
GND
C2
0.1 mF
+
C1
150 mF
TP8
GND
S001
Figure 8. TPS2041B EVM Schematic
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Bill of Materials and Schematics
TP3
OC
TP5
EN
U1
TPS2051BDBV
R1
10 kW
TP7
4
TP4
EN
OC
GND
IN
5V
5
IN
OUT
TP2
GND
3
2
1
TP1
C4
10 mF
OUT
5 V @ 500 mA
C3
0.1 mF
TP9
GND
C2
0.1 mF
+
C1
150 mF
TP8
GND
S002
Figure 9. TPS2051B EVM Schematic
8
TPS2041B/51B EVM Power-Distribution Switch
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of -0.3 V to 6.0 V, and the output voltage range of -0.3 V to 6.0 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 -40°C as long as the input and output ranges are maintained. These components
include but are not limited to, switching transistors, inductor, and IC. 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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