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Table of Contents
User’s Guide
TPS53129 Buck Controller Evaluation Module User's
Guide
ABSTRACT
The TPS53129EVM-621 evaluation module presents an easy-to-use reference design for a common dual-output
power supply using the TPS53129 controller in cost-sensitive applications.
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Electrical Performance Specifications................................................................................................................................. 2
3 Schematics..............................................................................................................................................................................3
4 Connector and Test Point Descriptions................................................................................................................................4
5 Test Setup................................................................................................................................................................................6
6 Test Procedure........................................................................................................................................................................ 8
7 Performance Data and Typical Characteristic Curves........................................................................................................ 9
8 EVM Assembly Drawings and Layout.................................................................................................................................13
9 Bill of Materials..................................................................................................................................................................... 16
10 Revision History................................................................................................................................................................. 17
List of Figures
Figure 3-1. TPS53129EVM-621 Schematic.................................................................................................................................3
Figure 4-1. Tip and Barrel Measurement for Output Voltage Ripple............................................................................................5
Figure 5-1. TPS53129EVM-621 Recommended Test Setup....................................................................................................... 7
Figure 7-1. Efficiency vs Load......................................................................................................................................................9
Figure 7-2. Efficiency vs Load......................................................................................................................................................9
Figure 7-3. Output Voltage vs Load........................................................................................................................................... 10
Figure 7-4. Output Voltage vs Load........................................................................................................................................... 10
Figure 7-5. Output Voltage Ripple..............................................................................................................................................11
Figure 7-6. Output Voltage Ripple..............................................................................................................................................11
Figure 7-7. Switching Waveform................................................................................................................................................12
Figure 7-8. Switching Waveform................................................................................................................................................12
Figure 8-1. Top Assembly.......................................................................................................................................................... 13
Figure 8-2. Bottom Assembly.................................................................................................................................................... 13
Figure 8-3. Top Layer.................................................................................................................................................................14
Figure 8-4. Bottom Layer........................................................................................................................................................... 14
Figure 8-5. Internal Layer 1....................................................................................................................................................... 15
Figure 8-6. Internal Layer 2....................................................................................................................................................... 15
Trademarks
D-CAP2™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
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1
Introduction
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1 Introduction
1.1 Description
The TPS53129EVM-621 evaluation board provides the user with a convenient way to evaluate the TPS53129
dual D-CAP2™ mode control step-down controller in a realistic cost-sensitive application. Providing both a low
core-type 1.05-V and I/O type 1.8-V output at up to 4 A from a loosely regulated 12-V (8-V to 22-V) source,
the TPS53129EVM-621 includes switches and test points to assist users in evaluating the performance of the
TPS53129 controller in their application.
1.2 Application
•
•
•
•
Digital television
Set-top box
DSL and cable modems
Cost-sensitive digital consumer products
1.3 Features
•
•
•
•
•
8-V to 22-V input
1.05-V and 1.8-V output
Up to 4 A per channel output
700-kHz pseudo-fixed frequency D-CAP2™ mode control
Independent enable switches for power-on/power-off testing
2 Electrical Performance Specifications
Table 2-1. TPS53129EVM-621 Electrical and Performance Specifications
Parameter
Notes and Conditions
MIN
TYP
MAX UNIT
INPUT CHARACTERISTICS
VIN
Input Voltage
IIN
Input Current
VIN = 12 V, IOUT1 = 4 A, IOUT2 = 4 A
No-Load Input Current
VIN = 12 V, IOUT = 0 A
VIN_UVLO Input UVLO
IOUT = 4 A
8
12
22
V
–
1.2
1.5
A
–
20
–
4.0
4.2
4.5
mA
V
V
OUTPUT CHARACTERISTICS
VOUT1
Output Voltage 1
VIN = 12 V, IOUT1 = 2 A
–
1.05
–
Line Regulation
VIN = 8 V to 22 V
–
–
1%
Load Regulation
IOUT1 = 0 A to 4 A
–
–
1%
VOUT1_rip Output Voltage Ripple
VIN = 12 V, IOUT2 = 4 A
–
–
IOUT1
Output Current 1
VIN = 8 V to 22 V
0
VOUT2
Output Voltage 2
VIN = 12 V, IOUT2 = 2 A
–
Line Regulation
VIN = 8 V to 22 V
–
Load Regulation
4
A
1.80
–
V
–
1%
1%
IOUT2 = 0 A to 4 A
–
–
VOUT2_rip Output Voltage Ripple
VIN = 12 V, IOUT2 = 4 A
–
–
IOUT2
VIN = 8 V to 22 V
0
Output Current 2
30 mVpp
30 mVpp
4
A
SYSTEMS CHARACTERISTICS
2
FSW
Switching Frequency
350
700
800
ηpk1
Peak Efficiency of Output 1
VIN = 12 V
–
85%
–
η1
Full-Load Efficiency of Output 1
VIN = 12 V, IOUT1 = 4 A
–
84%
–
ηpk2
Peak Efficiency of Output 2
VIN = 12 V
–
89%
–
η2
Full-Load Efficiency of Output 2
VIN = 12 V, IOUT2 = 4 A
–
88%
–
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Schematics
+
+
+
3 Schematics
For reference only. See Table 9-1 for specific values.
Figure 3-1. TPS53129EVM-621 Schematic
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Connector and Test Point Descriptions
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4 Connector and Test Point Descriptions
4.1 Enable Switches – SW1 and SW2
The TPS53129EVM-621 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 internal discharge characteristics of the
TPS53129.
To enable VOUT1, place SW1 in the EN position. To enable VOUT2, place SW2 in the EN position.
4.2 Switching Frequency Select Switch – SW3
The TPS53129EVM-621 does not populate SW3. When using the TPS53129EVM-621 to evaluate the
TPS53126 controller in the TSSOP package, SW3 can be populated to allow selection of the TPS53126
switching frequency between 350 kHz and 700 kHz.
4.3 Test Point Descriptions
Table 4-1 lists the test points, their labels, uses, and where additional information is located.
Table 4-1. TPS53129EVM-621 Test Points Description
Test Point
Label
Use
Section
TP1
SS1
Monitor Channel-1 Soft-Start Voltage
Section 4.3.4
TP2
SS2
Monitor Channel-2 Soft-Start Voltage
Section 4.3.4
TP3
GND
Ground for Input Voltage
Section 4.3.1
TP4
GND
Ground for Channel-1 Output Voltage
Section 4.3.2
TP5
SW1
Monitor Switching Node for Channel 1
Section 4.3.5
TP6
GND
Ground for Channel-2 Output Voltage
Section 4.3.3
TP7
VOUT2
Monitor Output Voltage for Channel 2
Section 4.3.3
TP8
VOUT1
Monitor Output Voltage for Channel 1
Section 4.3.2
TP9
VIN
Monitor Input Voltage
Section 4.3.1
TP10
VREG5
Monitor Output of VREG5 Regulator
Section 4.3.6
TP11
SW2
Monitor Switching Node for Channel 2
Section 4.3.5
4.3.1 Input Voltage Monitoring – TP3 and TP9
The TPS53129EVM-621 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 between TP9 and TP3. To use TP9 and TP3, connect a voltmeter positive terminal to TP9 and
negative terminal to TP3.
4.3.2 Channel-1 Output Voltage Monitoring – TP4 and TP8
The TPS53129EVM-621 provides two test points for measuring the voltage generated at the VOUT1 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 TP8 and TP4. To use TP8 and TP4, connect
a voltmeter positive terminal to TP8 and negative terminal to TP4.
For output ripple measurements, TP8 and TP4 allow a user to limit the ground loop area by using the tip and
barrel measurement technique shown in Figure 4-1.
4
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Connector and Test Point Descriptions
Metal Ground Barrel
Probe Tip
TP8
TP4
Figure 4-1. Tip and Barrel Measurement for Output Voltage Ripple
4.3.3 Channel-2 Output Voltage Monitoring – TP6 and TP7
The TPS53129EVM-621 provides two test points for measuring the voltage generated at the VOUT2 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 TP7 and TP6. To use TP7 and TP6, connect a voltmeter
positive terminal to TP7 and negative terminal to TP6.
For output ripple measurements, TP7 and TP6 allow a user to limit the ground loop area by using the tip and
barrel measurement technique shown in Figure 4-1.
4.3.4 Soft-Start Voltage Monitoring – TP1, TP2, and TP3
The TPS53129EVM-621 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.
4.3.5 Switching Node Monitoring – TP3, TP5, and TP11
The TPS53129EVM-621 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.
4.3.6 5-V Regulator Output Monitoring – TP3 and TP10
The TPS53129EVM-621 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.
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Test Setup
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5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
Use an input voltage source (VIN) of 0-V to 25-V variable DC source capable of supplying 2-ADC minimum.
5.1.2 Meters
A1: 0-ADC to 5-ADC, ammeter
V1: VIN, 0-V to 25-V voltmeter
V2: VOUT1, 0-V to 2-V voltmeter
V3: VOUT2, 0-V to 2-V voltmeter
5.1.3 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.
5.1.4 Oscilloscope and Probe
The oscilloscope, analog or digital, must be set for AC-coupled measurement with 20-MHz bandwidth limiting.
Use 20-mV/division vertical resolution and 1-µs/division horizontal resolution for output ripple voltage test.
Oscilloscope probes with exposed conductive ground barrels are recommended.
5.1.5 Recommended Wire Gauge
VIN to J3 – The connection between the source voltage VIN and J1 of the TPS53129EVM-621 can carry as
much as 2 ADC. The minimum recommended wire size is AWG 16 with the total length of wire less than two feet
(1-foot input, 1-foot return).
J1 to LOAD1 and J2 to LOAD2 – The connection between J1 and LOAD1, and J2 and LOAD2 of the
TPS53129EVM-621 can carry as much as 4 ADC each. The minimum recommended wire size is AWG 14 with
the total length of wire less than two feet (1-foot input, 1-foot return).
5.1.6 Other Test Equipment
FAN – The TPS53129EVM-621 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
recommended to reduce component temperatures when operating.
5.2 Recommended Setup
Figure 5-1 shows the recommended test setup to evaluate the TPS53129EVM-621. Working at an ESD
workstation, ensure that any wrist straps, bootstraps, or mats are connected referencing the user to earth ground
before power is applied to the EVM. An electrostatic smock and safety glasses also are recommended.
6
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Test Setup
FAN
+
V1
-
+
-
+
+
A1
-
+
LOAD1
1.05V @
4A
V2
LOAD2
1.8V @
4A
V3
-
+
VVIN
Figure 5-1. TPS53129EVM-621 Recommended Test Setup
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Test Procedure
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6 Test Procedure
6.1 Start-Up Procedure
1. Prior to connecting the DC input source VIN, it is advisable to limit the source current from VIN to 2 ADC
maximum. Ensure that VIN is initially set to 0 V.
2. Ensure that LOAD1 and LOAD2 are set to constant-current mode to sink 0 A before VIN is applied.
3. Verify that SW1 and SW2 are in the desired position.
4. Place a fan as shown in Figure 5-1 and turn on, making sure that air is flowing across the EVM.
5. Increase VIN from 0 VDC to 12 VDC.
6.2 Line/Load Regulation and Efficiency Measurement Procedure
1.
2.
3.
4.
5.
6.
Set up the TPS53129EVM-621 per Section 5.2.
Start up the TPS53129EVM-621 per Section 6.1.
Adjust VIN to desired value between 8 VDC and 22 VDC.
Adjust LOAD1/LOAD2 to desired load between 0 ADC and 4 ADC.
Read input voltage, output voltage, and input current from V1, V2/V3, and A1, respectively.
Shut down the TPS53129EVM-621 per Section 6.4.
6.3 Output Ripple Voltage Measurement Procedure
1.
2.
3.
4.
5.
Set up the TPS53129EVM-621 per Section 5.2.
Start up the TPS53129EVM-621 per Section 6.1.
Adjust VIN to desired value between 8 VDC and 22 VDC.
Adjust LOAD1/LOAD2 to desired load between 0 ADC and 4 ADC.
Connect the oscilloscope probe to TP8 and TP4 for VOUT1, or TP7 and TP6 for VOUT2 as shown in Figure
4-1.
6. Measure the output ripple.
7. Shut down the TPS53129EVM-621 per Section 6.4.
6.4 Shutdown Procedure
1.
2.
3.
4.
5.
6.
8
Set SW1 to DIS.
Set SW2 to DIS.
Decrease LOAD1 to 0 A, and shut down LOAD1.
Decrease LOAD2 to 0 A, and shut down LOAD2.
Decrease VIN to 0 V, and shut down VIN.
Shut down the fan.
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Performance Data and Typical Characteristic Curves
7 Performance Data and Typical Characteristic Curves
Figure 7-1 through Figure 7-8 present typical performance curves for the TPS53129EVM-621. Because 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.
7.1 Efficiency
90
VI = 8 V
85
h - Efficiency - %
80
VI = 12 V
75
VI = 22 V
70
65
60
VI = 8 V-22 V,
VOUT1 = 1.05 V,
IOUT1 = 0 A-4 A
55
50
0
1
2
3
ILOAD - Load Current - A
4
5
Figure 7-1. Efficiency vs Load
95
VI = 8 V
90
h - Efficiency - %
85
VI = 12 V
80
VI = 22 V
75
70
65
60
VI = 8 V-22 V,
VOUT2 = 1.8 V,
IOUT1 = 0 A-4 A
55
50
0
1
2
3
ILOAD - Load Current - A
4
5
Figure 7-2. Efficiency vs Load
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Performance Data and Typical Characteristic Curves
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7.2 Line and Load Regulation
1.06
1.058
VO - Output Voltage - V
VI = 8 V-22 V,
VOUT1 = 1.05 V,
IOUT1 = 0 A-4 A
VI = 22 V
1.056
1.054
VI = 12 V
1.052
1.05
VI = 8 V
1.048
1.046
1.044
0
1
2
3
ILOAD - Load Current - A
4
5
Figure 7-3. Output Voltage vs Load
1.83
VI = 22 V
VO - Output Voltage - V
1.825
VI = 8 V-22 V,
VOUT2 = 1.8 V,
IOUT2 = 0 A-4 A
1.82
1.815
VI = 12 V
1.81
VI = 8 V
1.805
1.8
1.795
0
0.5
1
1.5
2
2.5
3
ILOAD - Load Current - A
3.5
4
4.5
Figure 7-4. Output Voltage vs Load
10
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Performance Data and Typical Characteristic Curves
7.3 Output Voltage Ripple
TPS53129EVM-621
Test condition: Vin 12 V, Vo1 1.05 V, 4 A
Output Ripple
Figure 7-5. Output Voltage Ripple
TPS53129EVM-621
Test condition: Vin 12 V, Vo2 1.8 V, 4 A
Output Ripple
Figure 7-6. Output Voltage Ripple
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Performance Data and Typical Characteristic Curves
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7.4 Switch Node Waveforms
TPS53129EVM-621
Test condition: Vin 12 V, Vo1 1.05 V, 4 A
Switch Node
Figure 7-7. Switching Waveform
TPS53129EVM-621
Test condition: Vin 12 V, Vo2 1.8 V, 4 A
Switch Node
Figure 7-8. Switching Waveform
12
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EVM Assembly Drawings and Layout
8 EVM Assembly Drawings and Layout
Figure 8-1 through Figure 8-6 show the design of the TPS53129EVM-621 printed-circuit board (PCB). The EVM
has been designed using a 4-layer, 2-oz copper-clad circuit board of 3.5 inch by 2.7 inch to allow the user
to easily view, probe, and evaluate the TPS53129 control integrated circuit 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 8-1. Top Assembly
Figure 8-2. Bottom Assembly
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EVM Assembly Drawings and Layout
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Figure 8-3. Top Layer
Figure 8-4. Bottom Layer
14
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EVM Assembly Drawings and Layout
Figure 8-5. Internal Layer 1
Figure 8-6. Internal Layer 2
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Bill of Materials
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9 Bill of Materials
Table 9-1 contains the bill of materials for the TPS53129EVM-621. The reference designators refer to the
schematic in Figure 3-1 and assembly locations in Figure 8-1 and Figure 8-2. Components with a quantity of 0
listed are not populated on the PCB but are provided for reference.
Table 9-1. TPS53129EVM-621 Bill of Materials
Qty
16
RefDes
Value
Description
Size
Part Number
MFR
0
C1
Capacitor, Aluminum, 25 V, 20%
0.328 × 0.390
inch
Std
Std
0
C12, C19, C20,
C21
Capacitor, Ceramic
0603
Std
Std
1
C15
4.7 µF
Capacitor, Ceramic, 10 V, X5R, 20%
0805
Std
Std
1
C16
1 µF
Capacitor, Ceramic, 16 V, X5R, 20%
0805
Std
Std
4
C2, C3, C4, C5
10 µF
Capacitor, Ceramic, 25 V, X5R, 20%
1210
Std
Std
2
C22, C23
4700 pF
Capacitor, Ceramic, Low Inductance, 16 V, X7R,
20%
0603
Std
Std
0
C24, C25
Capacitor, Ceramic, 25 V, X7R, 20%
0603
Std
Std
2
C6, C11
0.1 µF
Capacitor, Ceramic, 50 V, X5R, 10%
0603
Std
Std
6
C7, C9, C10, C14, 47 µF
C17, C18
Capacitor, Ceramic, 6.3 V, X5R, 20%
1206
Std
Std
0
C8, C13
330 µF
Capacitor, PXE, 4.0 V, 15 mΩ, 20%
7343 (D)
APXE4R0ARA331MF
61G
NIPPON CHEMICON
2
D1, D2
BAT54XV2T1
G
Diode, Schottky, 200 mA, 30 V
SOD523
BAT54XV2T1G
On Semi
3
J1, J2, J3
ED120/2DS
Terminal Block, 2-pin, 15-A, 5.1 mm
0.40 × 0.35 inch
ED120/2DS
OST
2
L1, L2
1.5 µH
Inductor, SMT, 11 A, 9.7 mΩ
0.256 × 0.280
inch
SPM6530T-1R5M100
TDK
4
Q1, Q2, Q3, Q4
CSD17507Q5
A
MOSFET, N-Chan, 30 V, 65 A, 11.8 mΩ
QFN-8 POWER
CSD17507Q5A
TI
1
R1
1.62 k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
4
R10, R4, R6, R8
10.0 k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
R11, R12
5.11
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R13
432
Resistor, Chip, 1/16W, 1%
0603
Std
Std
0
R14, R15
Resistor, Chip, 1/8W, 5%
0603
Std
Std
2
R17, R18
Resistor, Chip, 1/16W, 1%
0603
Std
Std
0
R2, R7, R9
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R3
3.32 k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R5
12.1 k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
SW1, SW2
G12AP-RO
Switch, ON-ON Mini Toggle
0.28 × 0.18"
G12AP-RO
Nikkai
0
SW3
G12AP-RO
Switch, ON-ON Mini Toggle
0.28 × 0.18"
G12AP-RO
Nikkai
4
TP1, TP2, TP5,
TP11
5012
Test Point, White, Thru Hole
0.125 × 0.125
inch
5012
Keystone
1
TP10
5013
Test Point, Orange, Thru Hole
0.125 × 0.125
inch
5013
Keystone
3
TP3, TP4, TP6
5011
Test Point, Black, Thru Hole
0.125 × 0.125
inch
5011
Keystone
2
TP7, TP8
5014
Test Point, Yellow, Thru Hole
0.125 × 0.125
inch
5014
Keystone
1
TP9
5010
Test Point, Red, Thru Hole
0.125 × 0.125
inch
5010
Keystone
1
U1
TPS53129PW IC, Dual Synchronous Step-Down Controller For
Low-Voltage Power Rails
TSSOP
TPS53129PW
TI
1
--
2.7 inch × 3.5
inch
HPA621
Any
2.00
PCB, 2.70 inch × 3.50 inch × 0.063 inch FR-4
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Revision History
10 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (February 2011) to Revision A (January 2022)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
• Updated the user's guide title............................................................................................................................. 2
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IMPORTANT NOTICE AND DISCLAIMER
TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE
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