User's Guide
SLVU392–July 2010
TPS53125EVM-599
The TPS53125EVM-599 Evaluation Module presents an easy-to-use reference design for a common dual
output power supply using the TPS53125 controller in cost-sensitive applications. Also included are the
schematic, board layout, and bill of materials.
Contents
1
Description ................................................................................................................... 2
1.1
1.2
Applications ......................................................................................................... 2
Features ............................................................................................................. 2
2
3
4
TPS53125EVM-599 Electrical Performance Specifications ........................................................... 2
TPS53125EVM-599 Schematic ........................................................................................... 3
Connector and Test Point Descriptions .................................................................................. 4
4.1
4.2
Enable Jumpers/Switches –SW1 and SW2 .................................................................... 4
Test Point Descriptions ............................................................................................ 4
5
Test Setup ................................................................................................................... 5
5.1
5.2
5.3
5.4
5.5
Equipment ........................................................................................................... 5
Equipment Setup ................................................................................................... 6
Start-Up/Shutdown Procedures .................................................................................. 7
Output Ripple Voltage Measurement Procedure .............................................................. 8
Equipment Shutdown .............................................................................................. 8
6
TPS53125EVM-599 Test Data ............................................................................................ 8
6.1
6.2
6.3
6.4
Efficiency ............................................................................................................ 8
Line and Load Regulation ......................................................................................... 9
Output Voltage Ripple and Switching Node Waveforms .................................................... 10
Switch Node ....................................................................................................... 11
7
8
TPS53125EVM-599 Assembly Drawings and Layout ................................................................ 12
TPS53125EVM-599 Bill of Materials .................................................................................... 15
List of Figures
1
TPS53125EVM-599 Schematic ...........................................................................................
TPS53125EVM-599 Recommended Test Setup .......................................................................
TPS53125EVM-599 Efficiency vs Load Current ........................................................................
TPS53125EVM-599 Efficiency vs Load Current ........................................................................
TPS53125EVM-599 Output Voltage vs Load Current .................................................................
2
3
4
5
6
TPS53125EVM-599 Output Voltage vs Load Current ................................................................ 10
TPS53125EVM-599 Output Voltage Ripple and Switching Waveform............................................. 10
TPS53125EVM-599 Output Voltage Ripple............................................................................ 11
TPS53125EVM-599 Switching Waveforms ............................................................................ 11
TPS53125EVM-599 Switching Waveforms ............................................................................ 12
TPS53125EVM-599 Component Placement, Viewed From Top.................................................... 12
TPS53125EVM-599 Top Copper, Viewed From Top................................................................. 13
TPS53125EVM-599 Bottom Copper, Viewed From Bottom ......................................................... 13
TPS53125EVM-599 Internal 1, X-Ray View From Top............................................................... 14
TPS53125EVM-599 Internal 2, X-Ray View From Top............................................................... 14
7
8
9
10
11
12
13
14
15
D-CAP2 is a trademark of Texas Instruments.
SLVU392–July 2010
1
TPS53125EVM-599
Copyright © 2010, Texas Instruments Incorporated
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Connector and Test Point Descriptions
4
Connector and Test Point Descriptions
4.1 Enable Jumpers/Switches –SW1 and SW2
The TPS53125EVM-599 board includes independent enable switches for each of the two outputs. When
the switch is in the DIS position, the channel is disabled and discharged per the TPS53125’s internal
discharge characteristics.
To enable VOUT1, place SW1 in the EN position. To enable VOUT2, place SW2 in the EN position.
4.2 Test Point Descriptions
Table 2 lists the test points, their labels, uses, and where additional information is located.
Table 2. Test Point Description
Test Point
TP1
Label
TEST1
TEST2
GND
Use
Section
4.2.4
4.2.4
4.2.1
4.2.2
4.2.5
4.2.3
4.2.3
4.2.2
4.2.1
4.2.6
4.2.5
4.2.2
4.2.3
Monitor Channel 1 Soft-Start Voltage
Monitor Channel 2 Soft-Start Voltage
Ground for Input Voltage
TP2
TP3
TP4
GND
Ground for Channel 1 Output Voltage
Monitor Switching Node for Channel 1
Ground for Channel 2 Output Voltage
Monitor Output Voltage for Channel 2
Monitor Output Voltage for Channel 1
Monitor Input Voltage
TP5
SW1
TP6
GND
TP7
VO2
TP8
VO1
TP9
VIN
TP10
TP11
CN1
CN2
VREG5
SW2
Monitor Output of VREG5 Regulator
Monitor Switching Node for Channel 2
Monitor Output Voltage for Channel 1
Monitor Output Voltage for Channel 2
VOUT1
VOUT2
4.2.1
4.2.2
Input Voltage Monitoring – TPS and TP9
The TPS53125EVM-599 provides two test points for measuring the voltage applied to the module. This
allows the user to measure the actual module voltage without losses from input cables and connectors.
Measure all input voltage measurements between TP9 and TP3. To use TP9 and TP3, connect a
voltmeter positive terminal to TP9 and negative terminal to TP3.
Channel 1 Output Voltage Monitoring – TP4 and TP8 or CN1
TPS53125EVM-599 provides two test points for measuring the voltage generated at the VO1 Output by
the module. This allows the user to measure the actual output voltage without losses from output cables
and connectors. Measure all DC Output voltage between TP8 and TP4. To use TP8 and TP4, connect a
voltmeter positive terminal to TP8 and negative terminal to TP4.
TPS53125EVM-599 also provides a shielded oscilloscope jack to allow ac measurements of the output
ripple. Insert an oscilloscope probe with exposed ground barrel into CN1 for all Output 1 ripple
measurements.
4.2.3
Channel 2 Output Voltage Monitoring – TP6 and TP7 or CN2
TPS53125EVM-599 provides two test points for measuring the voltage generated at the VO1 Output by
the module. This allows the user to measure the actual output voltage without losses from output cables
and connectors. Measure all dc output voltage measurements between TP7 and TP6. To use TP7 and
TP6, connect a voltmeter positive terminal to TP7 and negative terminal to TP6.
TPS53125EVM-599 also provides a shielded oscilloscope jack to allow ac measurements of the output
ripple. Insert an oscilloscope probe with exposed ground barrel into CN2. for all Output 2 ripple
measurements.
4
TPS53125EVM-599
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Test Setup
4.2.4
4.2.5
4.2.6
5
Soft-Start Voltage Monitoring – TP1, TP2, and TP3
TPS53125EVM-599 provides two test points for measuring the soft-start ramp voltages. TP1 monitors the
soft-start ramp of Channel 1. TP2 monitors the soft-start ramp of Channel 2. To use TP1 or TP2, connect
an oscilloscope probe between TP1 or TP2 and TP3.
Switching Node Monitoring – TP3, TP5, and TP11
TPS53125EVM-599 provides two test points for measuring the switching node waveform voltages. TP5
monitors the switching node of Channel 1. TP2 monitors the switching node of Channel 2. To use TP5 or
TP11, connect an oscilloscope probe between TP5 or TP11 and TP3
5-V Regulator Output Monitoring – TP3 and TP10
TPS53125EVM-599 provides a test point for measuring the output of the internal 5-V regulator. TP10
monitors the output voltage of the internal 5-V regulator. To use TP10, connect a voltmeter positive
terminal to TP10 and negative terminal to TP3.
Test Setup
5.1 Equipment
The following equipment is recommended for testing the TPS53125EVM-599 evaluation board.
5.1.1
5.1.2
Voltage Source
The input voltage source, VVIN, must be a 0-V to 15-V, variable dc source capable of supplying 3 Adc
minimum.
Meters
A1: 0-Adc to 4-Adc ammeter
V1: VIN, 0-V to 22-V voltmeter
V2: VOUT1, 0-V to 2-V voltmeter
V3: VOUT2, 0-V to 2-V voltmeter
5.1.3
5.1.4
Loads
LOAD1: One output load is an electronic load set for constant current mode capable of 0 Adc to 4 Adc at
1.05 Vdc.
LOAD2: The other output load is an electronic load set for constant current mode capable of 0 Adc to 4
Adc at 1.8 Vdc.
Oscilloscope and Probe
The oscilloscope, analog or digital, must be set for ac-coupled measurement with a 20-MHz bandwidth
limiting. Use 20 mV/division vertical resolution, 1.0 µs/division horizontal resolution for the Output Ripple
Voltage Test. Set cursors at +20 mV and –20 mV.
The oscilloscope probe must be a Tektronix P6138 or equivalent oscilloscope probe with exposed
conductive ground barrels.
5.1.5
Recommended Wire Gauge
VVIN to J3 – The connection between the source voltage, VVIN and J1 of TPS53125EVM-599 can carry as
much as 2 Adc. The minimum recommended wire size is AWG #16 with the total length of wire less than 2
feet (1-foot input, 1-foot return).
5
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Test Setup
J1 to LOAD1 and J2 to LOAD2 - The connection between J1 and LOAD1 and J2 and LOAD2 of
TPS53125EVM-599 can carry as much as 4 Adc each. The minimum recommended wire size is AWG
#14, with the total length of wire less than 2 feet (1-foot input, 1-foot return).
5.1.6
Other Test Equipment
Fan – The TPS53125EVM-599 Evaluation Module includes components that can become hot to the touch.
Because this EVM is not enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is
required to reduce component temperatures when operating.
5.2 Equipment Setup
Figure 2 shows the basic test setup that is recommended to evaluate the TPS53125EVM-599. Note that
although the return for J3 and J1 and JP2 are the same system ground, the connections must remain
5.2.1
Test Procedure
1. When working at an ESD workstation, ensure that wrist straps, bootstraps, or mats are connected
referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and
safety glasses are also recommended.
2. Prior to connecting the dc input source, VIN, it is advisable to limit the source current from VIN to 3 Adc
3. Verify SW1 and SW2 are in the desired position.
4. Increase VIN from 0 V to 12 Vdc.
5. Vary VIN between 8 Vdc and 22 Vdc.
6. Vary LOAD1 between 0 A and 4 Adc.
7. Vary LOAD2 between 0 A and 4 Adc.
8. Adjust SW1 between EN and DIS.
9. Adjust SW2 between EN and DIS.
10. Set SW1 to DIS.
11. Set SW2 to DIS.
12. Decrease LOAD1 to 0 A.
13. Decrease LOAD2 to 0 A.
14. Decrease VIN to 0 V.
6
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Test Setup
5.2.2
Test Setup Diagram
FAN
Oscilloscope
1MW, AC
20mV / div
20MHz
+
-
V1
+
LOAD1
1.05V @
4A
+
V2
-
-
-
LOAD2
1.8V @
4A
-
V3
+
+
+
A1
V
VIN
-
Figure 2. TPS53125EVM-599 Recommended Test Setup
5.3 Start-Up/Shutdown Procedures
Perform the start-up and shutdown procedures in the following manner.
1. Increase VIN from 0 V to 12 Vdc.
2. Vary LOAD1 from 0 V – 4 Adc.
3. Vary LOAD2 from 0 V – 4 Adc.
4. Vary VIN from 8 Vdc to 22 Vdc.
5. Decrease VIN to 0 Vdc.
6. Decrease LOAD1 to 0 A.
7
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TPS53125EVM-599 Test Data
7. Decrease LOAD2 to 0 A.
5.4 Output Ripple Voltage Measurement Procedure
Perform the Output Ripple Voltage Measurement procedure in the following manner.
1. Increase VIN from 0 V to 12 Vdc.
2. Adjust LOAD1 to desired load between 0 Adc and 4 Adc.
3. Adjust LOAD2 to desired load between 0 Adc and 4 Adc.
4. Adjust VIN to desired load between 8 Vdc and 22 Vdc.
6. Measure Output Ripple.
7. Decrease VIN to 0 Vdc.
8. Decrease LOAD1 to 0 A.
9. Decrease LOAD2 to 0 A.
5.5 Equipment Shutdown
Shut down the equipment in the following manner.
1. Shut down oscilloscope.
2. Shut down VIN.
3. Shut down LOAD1.
4. Shut down LOAD2.
5. Shut down FAN.
6
TPS53125EVM-599 Test Data
actual performance data can be affected by measurement techniques and environmental variables, these
curves are presented for reference and may differ from actual field measurements.
6.1 Efficiency
95
90
85
80
75
70
65
V = 8 V
I
V = 12 V
I
V = 22 V
I
60
55
50
0
1
2
3
4
5
I
- Load Current - A
LOAD
VIN = 8 V – 22 V, VOUT1 = 1.05 V, IOUT1 = 0 A – 4 A
Figure 3. TPS53125EVM-599 Efficiency vs Load Current
8
TPS53125EVM-599
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TPS53125EVM-599 Test Data
100
90
V = 8 V
I
80
70
60
50
40
30
20
V = 12 V
I
V = 22 V
I
10
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
I
- Load Current - A
LOAD
VIN = 8 V – 22 V, VOUT2 = 1.80 V, IOUT2 = 0 A – 4 A
Figure 4. TPS53125EVM-599 Efficiency vs Load Current
6.2 Line and Load Regulation
1.07
1.065
1.06
V = 22 V
I
V = 12 V
I
V = 8 V
I
1.055
1.05
0
0.5
1
1.5
I
2
2.5
3
3.5
4
4.5
- Load Current - A
LOAD
VIN = 8 V – 22 V, VOUT1 = 1.05 V, IOUT = 0 A – 4 A
Figure 5. TPS53125EVM-599 Output Voltage vs Load Current
9
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TPS53125EVM-599 Test Data
1.86
1.855
1.85
1.845
1.84
V = 22 V
I
V = 12 V
I
1.835
1.83
V = 8 V
I
1.825
1.82
0
0.5
1
1.5
I
2
2.5
3
3.5
4
4.5
- Load Current - A
LOAD
VIN = 8 V – 22 V, VOUT1 = 1.80 V, IOUT = 0 A – 4 A
Figure 6. TPS53125EVM-599 Output Voltage vs Load Current
6.3 Output Voltage Ripple and Switching Node Waveforms
VIN = 12, VOUT1 = 1.05, IOUT1 = 4 A
Figure 7. TPS53125EVM-599 Output Voltage Ripple and Switching Waveform
10
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TPS53125EVM-599 Test Data
VIN = 12, VOUT2 = 1.80, IOUT2 = 4 A
Figure 8. TPS53125EVM-599 Output Voltage Ripple
6.4 Switch Node
tVIN = 12, VOUT1 = 1.05, IOUT1 = 4A,
Ch1: TP5 (SW1)
Figure 9. TPS53125EVM-599 Switching Waveforms
11
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TPS53125EVM-599 Assembly Drawings and Layout
VIN = 12, VOUT2 = 1.80, IOUT2 = 4A
Ch1: TP11 (SW2)
Figure 10. TPS53125EVM-599 Switching Waveforms
7
TPS53125EVM-599 Assembly Drawings and Layout
printed-circuit board. The EVM has been designed using a 4-layer, 2-oz copper-clad circuit board 3.5 in
2.7 to allow the user to easily view, probe, and evaluate the TPS53125 control IC in a practical
application. Moving components to both sides of the PCB or using additional internal layers can offer
additional size reduction for space-constrained systems.
Figure 11. TPS53125EVM-599 Component Placement, Viewed From Top
12
TPS53125EVM-599
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TPS53125EVM-599 Assembly Drawings and Layout
Figure 12. TPS53125EVM-599 Top Copper, Viewed From Top
Figure 13. TPS53125EVM-599 Bottom Copper, Viewed From Bottom
13
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TPS53125EVM-599 Assembly Drawings and Layout
Figure 14. TPS53125EVM-599 Internal 1, X-Ray View From Top
Figure 15. TPS53125EVM-599 Internal 2, X-Ray View From Top
14
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TPS53125EVM-599 Bill of Materials
8
TPS53125EVM-599 Bill of Materials
The Table 3 contains the bill of materials for TPS53125EVM-599. The reference designators reference the
schematic in Figure 1 and assembly locations in Figure 11. The components listed with a quantity of 0 are
not populated on the PCB but are provided for reference.
Table 3. TPS53125EVM-599 Bill of Materials
QTY RefDes
Value
Description
Size
Part Number
MFR
Std
0
0
C1
Capacitor, Aluminum, 25V, 20%
Capacitor, Ceramic,
0.328 x 0.390 inch
0603
Std
Std
C12, C19,
C20, C21
Std
0
1
1
4
C14, C7
C15
Capacitor, OS CON, 6.3V,20%
0.260 Sq inch
0805
Std
Std
Std
Std
Std
Std
Std
Std
4.7µF
1µF
Capacitor, Ceramic, 10V, X5R, 20%
Capacitor, Ceramic, 16V, X5R, 20%
Capacitor, Ceramic, 6.3V, X5R, 20%
C16
0805
C9, C10,
C17, C18
47µF
1206
4
2
C2, C3, C4, 10µF
C5
Capacitor, Ceramic, 25V, X5R, 20%
1210
0603
Std
Std
Std
Std
Std
Std
C22, C23
4700pF
Capacitor, Ceramic, Low Inductance,
16V, X7R, 20%
2
0
C6, C11
C8, C13
0.1µF
Capacitor, Ceramic, 50V, X7R, 10%
0603
330µF
Capacitor, PXE, 330-µF, 4.0-V, 15-mΩ,
7343 (D)
APXE4R0ARA331MF61G NIPPON CHEMI-CON
20%
2
CN1, CN2
131-5031-00
Adaptor, 3.5-mm probe clip ( or
131-5031-00)
0.2
131-4244-00
Tektronix
0
3
2
2
2
1
2
1
0
1
2
1
2
2
4
D1, D2
J1, J2, J3
L1, L2
Diode, Schottky, 1-A, 30-V
Terminal Block, 2-pin, 15-A, 5.1mm
Inductor, SMT, 5.6A, 29.7 mΩ
MOSFET, N-ch, 30-V, 10.2-A, 14-mΩ
MOSFET, N-ch, 30-V, 11.4-A, 11.4-mΩ
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Switch, ON-ON Mini Toggle
Test Point, White, Thru Hole
SMA
Std
Std
ED120/2DS
3.3µH
0.40 x 0.35 inch
ED120/2DS
OST
TDK
Fairchild
Fairchild
Std
0.256 x 0.280 inch
SPM6530T-3R3M
Q1, Q3
Q2, Q4
R1
FDS8876
FDS8690
1.82K
SO8
FDS8876
FDS8690
Std
SO8
0603
R11, R12
R13
10
0603
Std
Std
430
0603
Std
Std
R2, R7, R9
R3
0603
Std
Std
3.32K
0603
Std
Std
R4, R6
R5
10.0K
0603
Std
Std
12.1K
0603
Std
Std
R8, R10
SW1, SW2
5.62K
0603
Std
Std
G12AP-R0
5012
0.28 x 0.18"
0.125 x 0.125 inch
G12AP-R0
5012
Nikkai
Keystone
TP1, TP2,
TP5, TP11
1
3
TP10
5013
5011
Test Point, Orange, Thru Hole
Test Point, Black, Thru Hole
0.125 x 0.125 inch
0.125 x 0.125 inch
5013
5011
Keystone
Keystone
TP3, TP4,
TP6
2
1
1
TP7, TP8
TP9
5014
5010
Test Point, Yellow, Thru Hole
Test Point, Red, Thru Hole
0.125 x 0.125 inch
0.125 x 0.125 inch
TSSOP
5014
Keystone
Keystone
TI
5010
U1
TPS53125PW IC, Dual Synchronous Step-Down
Controller For Low-Voltage Power Rails
TPS53125PW
15
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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
SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all
claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to
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
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
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
product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s
environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
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 8 V to 22 V and the output voltage range of 0.8 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 60° C. The EVM is designed to
operate properly with certain components above 60° 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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
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Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
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