AN-2021 LM3753/54 Evaluation Board
User's Guide
Literature Number: SNVA420
December 2009
Contents
1
2
Introduction ........................................................................................................................ 5
Powering and Loading Considerations .................................................................................. 5
4
5
6
........................................................................................ 5
Board Configuration ............................................................................................................ 6
3.1
LM3753 TRACK ......................................................................................................... 6
3.2
LM3754 SOFT-START ................................................................................................. 6
3.3
OUTPUT VOLTAGE RIPPLE .......................................................................................... 6
3.4
EXTERNAL CLOCK SYNCHRONIZATION .......................................................................... 7
3.5
POWER GOOD .......................................................................................................... 7
3.6
MARGIN .................................................................................................................. 7
3.7
DCR and RESISTOR SENSE ......................................................................................... 7
3.8
LOAD PULSE GENERATOR .......................................................................................... 7
3.9
OVER TEMPERATURE PROTECTION .............................................................................. 8
3.10 VCC1, VCC2 and VDD ................................................................................................. 8
3.11 ACTIVE LOADS ......................................................................................................... 8
Typical Performance Characteristics ..................................................................................... 8
Evaluation Board Schematic ............................................................................................... 10
PCB Layout ...................................................................................................................... 18
2
Table of Contents
2.1
3
QUICK SETUP PROCEDURE
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List of Figures
1
Basic Test Setup for the LM3753/54 Evaluation Board ................................................................ 6
2
Output Voltage Ripple Measurement Setup ............................................................................. 7
3
Evaluation Board Schematic — Master
4
Evaluation Board Schematic — Slave .................................................................................. 11
5
Evaluation Board Schematic — Interface .............................................................................. 11
6
Top Layer Components and Overlay ................................................................................... 18
7
Top Layer Copper ......................................................................................................... 19
8
Mid Layer 1 Copper ....................................................................................................... 20
9
Mid Layer 2 Copper ....................................................................................................... 21
10
Bottom Layer Copper as Viewed From Top
11
................................................................................
...........................................................................
Bottom Layer Components and Overlay as Viewed From Top .....................................................
10
22
23
List of Tables
1
Bill of Materials for LM3753 Evaluation Board ......................................................................... 12
2
Bill of Materials for LM3754 Evaluation Board ......................................................................... 15
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3
User's Guide
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AN-2021 LM3753/54 Evaluation Board
The LM3753/54 evaluation board is designed to provide the design engineer with a fully functional power
converter based solution using two LM3753 or LM3754 2-Phase Buck Controllers. This evaluation board
produces an output voltage of 1.2 V at 25A per phase for a total of 100A. The switching frequency for the
converter is set to 300 kHz per phase, for an effective 1.2 MHz at the input and output. The gate signals
for each controller’s outputs are 180 degree out of phase, with the two controllers having a 90 degree
phase shift from each other. The printed circuit board consists of 4 layers of FR4 material with 2 ounce
copper on all layers. This application note contains the evaluation board schematics, Bill-of-Materials
(BOM) and a quick setup procedure. Refer to the LM3753/54 datasheet for complete circuit design
information.
All trademarks are the property of their respective owners.
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Introduction
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1
Introduction
The LM3753/54 evaluation board is designed to provide the design engineer with a fully functional power
converter based solution using two LM3753 or LM3754 2-Phase Buck Controllers. This evaluation board
produces an output voltage of 1.2 V at 25A per phase for a total of 100A. The switching frequency for the
converter is set to 300 kHz per phase, for an effective 1.2 MHz at the input and output. The gate signals
for each controller’s outputs are 180 degree out of phase, with the two controllers having a 90 degree
phase shift from each other. The printed circuit board consists of 4 layers of FR4 material with 2 ounce
copper on all layers. This application note contains the evaluation board schematics, Bill-of-Materials
(BOM) and a quick setup procedure. Refer to the LM3753/54 datasheet for complete circuit design
information.
The performance of the evaluation board is as follows:
2
Input Range
: 6V to 18V
Output Voltage
1.2V ± 1%
Output Current
0A to 100A
Switching Frequency
300 kHz
Load Regulation
0.1%
Board Size
4.2 x 5.4 x 0.063 inches
Powering and Loading Considerations
Read this entire page prior to attempting to power the evaluation board.
2.1
QUICK SETUP PROCEDURE
Step 1: Use an input power supply with at least 30A current capability. Connect the positive output of the
power supply to the VIN terminal T1. Connect the negative output of the power supply to the input GND
terminal T2.
Step 2: Connect a load with 100A capability to the VOUT terminal T3 and GND terminal T4.
Step 3: (LM3753 only) Connect a secondary power supply to the TRACK terminal TP13 and GND
terminal TP2. Set the power supply voltage to 3.3V. Since the LM3753 is configured such that VOUT
follows the TRACK input, VOUT cannot come up without applying a voltage to TRACK.
Step 4: Ensure that the Load Pulse switch SW1 is in the center OFF position. Check that the current limit
trimmers R18 and R26 are turned fully clockwise for maximum output current. J1, J3, J5 and J7 should be
installed, with J2, J4, J6 and J8 open.
Step 5: Set VIN to 12 V with no load being applied. Turn on the input power supply (followed by the
secondary power supply for the LM3753 TRACK). The output voltage should be in regulation with a
nominal value of 1.2V.
Step 6: Slowly increase the load while monitoring the output voltage. The output voltage should remain in
regulation up to the full load current of 100A.
Step 7: Slowly vary the input voltage from 6V to 18V. The output voltage should remain in regulation with
a nominal value of 1.2V.
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Board Configuration
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TP1
0-18V, 30A
DC Power Supply
VOUT
VIN
LM3753/54
EVALUATION BOARD
TP3
TP4
GND
GND
DVM
Electronic Load
0A ± 100A
DVM
TP2
Figure 1. Basic Test Setup for the LM3753/54 Evaluation Board
3
Board Configuration
3.1
LM3753 TRACK
The LM3753 evaluation board is configured such that VOUT follows the TRACK input. This configuration
will not allow VOUT to come up without applying a voltage to TRACK. In order to produce 1.2V on the
output, the TRACK pin must be connected to a secondary 3.3V power supply.
To prevent current limit during startup, the rise time of the 3.3V TRACK signal should be longer than 100
μs.
3.2
LM3754 SOFT-START
The LM3754 evaluation board is configured such that VOUT follows the SS signal, which is set by C12
and an internal 10 μA current source. This allows the LM3754 to operate on its own, with a single power
supply connected to VIN.
3.3
OUTPUT VOLTAGE RIPPLE
Output voltage ripple measurement should be taken directly across the output capacitor C66 between
terminals TP3 and TP4. Care must be taken to minimize the loop area between the scope probe tip and
the ground lead in order to minimize noise in the measurement. This can be achieved by removing the
probe’s spring tip and ground lead and then wrap a bare wire around the scope probe shaft. The bare wire
should be in contact with the probe shaft since this is the ground lead for the probe. The measurement
can be taken by connecting the bare wire onto the ground side of the capacitor and the probe tip onto the
positive side of the capacitor. Figure 2 shows a diagram of this measurement technique.
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Board Configuration
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OSCILLOSCOPE
Bare Wire
COUT
VOUT
GND
Figure 2. Output Voltage Ripple Measurement Setup
3.4
EXTERNAL CLOCK SYNCHRONIZATION
A SYNCIN terminal has been provided on the evaluation board in order to synchronize the converter to an
external clock or other fixed frequency signal from 225 kHz to 375 kHz. Refer to the LM3753/54 datasheet
for complete information.
3.5
POWER GOOD
A PGOOD terminal provides monitoring of the Power Good signal. When PGOOD is high at VCC1, the
output voltage is within the Power Good window.
3.6
MARGIN
A MARGIN terminal has been provided on the evaluation board in order to adjust the output voltage by
±5%. Shorting the MARGIN terminal to GND will adjust the output up 5%. Shorting the MARGIN terminal
to VOUT will adjust the output down 5%.
3.7
DCR and RESISTOR SENSE
The LM3753/54 is delivered with the resistor sense option selected. To configure the board for DCR
(Inductor DC Resistance) sensing, remove J1, J3, J5 and J7. Turn the current limit trimmers R18 and R26
fully counter-clockwise for the lower DC resistance. Short the power connections J2, J4, J6 and J8. Holes
for the power jumpers will accommodate #14 AWG or 2 x #18 AWG solid copper wires. #2-56 hardware
may also be used for the power connections. Due to the tight spacing, stagger the screws and nuts on the
top and bottom; wrap #18 AWG solid copper wire around the hardware on the top side and tighten. Take
care to avoid damaging adjacent components, particularly Q14-Q17 on the bottom side. Brass jumpers
such as those used on terminal blocks should be avoided since the resistance is four times that of copper.
3.8
LOAD PULSE GENERATOR
An on-board load pulse generator allows for easy evaluation of the output voltage transient response. The
LPI (Load Pulse In) and LPO (Load Pulse Out) terminals provide the interface to the load pulse generator.
Setting SW1 to EXT connects LPI to LPO, which then allows the load pulse generator to be driven by LPI
with an external 5V logic signal. Setting SW1 to INT allows the load pulse generator to be driven with an
internally generated 1 ms pulse at 5% duty cycle.
J9 selects the amount of load. With J9 open, Load Branch 1 is engaged to draw 1.2V / 0.05Ω = 24A. With
J9 shorted, Load Branch 1 and Load Branch 2 are engaged to draw 1.2V / 0.025Ω = 48A. TP41 through
TP44 provide monitoring of the load step.
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Typical Performance Characteristics
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R59, C61 and the gate impedance of Q14-Q17 set the slew rate. With J9 open, R59 = 51Ω and C61 =
0.01 μF, the slew rate is 24A / 1 μs. With J9 open, R59 = 51Ω and C61 open, the slew rate is 24A / 200
ns. Results are shown in the Section 4.
3.9
OVER TEMPERATURE PROTECTION
An LM26LV provides over temperature protection should the PC board exceed 105°C. This shuts down
switching by pulling the /FAULT bus low. Normal operation resumes when the board cools below 100°C. A
VTEMP terminal provides an analog voltage which is inversely proportional to temperature. Refer to the
LM26LV datasheet for complete design information.
3.10 VCC1, VCC2 and VDD
The VCC and VDD terminals provide monitoring points for the on-board voltages. For the evaluation
board, VDD is generated by an NPN linear regulator controlled by the LM3753/54. To demonstrate the
maximum power stage efficiency, a 5V current limited external supply may be used for VDD. Extreme
care must be exercised when applying an external voltage to the VDD terminal. Under no
circumstances should a voltage be applied to VDD while VIN < 5V, as damage to the LM3753/54
will occur. To protect U1 and U2, the circuit may be modified by placing small Schottky diodes in series
with R2 and R16 to block the reverse voltage. Refer to the LM3753/54 datasheet for complete circuit
design information.
3.11 ACTIVE LOADS
Many constant-current types of active loads can exhibit an initial short circuit, which is sustained well
beyond the normal soft-start cycle. To avoid current limit during startup, wait until the output voltage is up
before turning on the load. Using an active load with a constant-resistance mode will avoid this startup
timing issue.
4
Typical Performance Characteristics
Efficiency with 5V External VDD and DCR Sense
Efficiency with VDD Linear Regulator and Resistor Sense
Output Load Transient +24A / 1 μs
Output Load Transient −24A / 1 μs
1.1980V
VOUT 20 mV/Div
VOUT 20 mV/Div
1.1980V
ILOAD1 24A 1 #s
STEP
5 #s/Div
8
AN-2021 LM3753/54 Evaluation Board
ILOAD1 24A 1 #s
STEP
5 #s/Div
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Typical Performance Characteristics
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Output Load Transient +24A / 200 ns
1.1980V
Output Load Transient −24A / 200 ns
VOUT 20 mV/Div
VOUT 20 mV/Div
1.1980V
ILOAD1 24A 200 ns STEP
ILOAD1 24A 200 ns STEP
10 #s/
Div
Startup from Enable
10 #s/Div
Restart from Fault
PGOOD 5V/Div
PGOOD
5V/Div
VOUT 1V/Div
VOUT 1V/Div
SS 1V/Div
SS 1V/Div
EN 1V/Div
EN TRIP POINT
1 ms/Div
Switching at 12V Input
FAULTb 5V/Div
1 ms/Div
Output Voltage Ripple
1 #s/Div
SWA
10V/Div
IOUT = 100A
1.1980V
VOUT 10 mV/Div
SWB
10V/Div
SWC
10V/Div
SWD
10V/Div
1 #s/
Div
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Evaluation Board Schematic
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Phase Matching
5
VIAVE
vs
IOUT
Evaluation Board Schematic
NT1, NT2 and NT3 are net ties for GND sensing.
Figure 3. Evaluation Board Schematic — Master
10
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Evaluation Board Schematic
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Figure 4. Evaluation Board Schematic — Slave
Figure 5. Evaluation Board Schematic — Interface
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Evaluation Board Schematic
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Table 1. Bill of Materials for LM3753 Evaluation Board
12
Designator
Value
Package
Description
Manufacturer
Part Number
QTY
C1
470uF
SMT
Radial G
AL, 25V, 20%, 0.06 Ohm ESR
Panasonic
EEE-FP1E471AP
1
C2, C15
1uF
0603
Ceramic, X7R, 16V, 10%
TDK
C1608X7R1C105
K
2
C3, C10, C16,
C18
4.7uF
0805
Ceramic, X7R, 16V, 10%
MuRata
GRM21BR71C47
5KA73L
4
C4
0.047uF
0603
Ceramic, X7R, 25V, 10%
TDK
C1608X7R1E473
K
1
C5
100pF
0603
Ceramic, C0G/NP0, 50V, 5%
TDK
C1608C0G1H101
J
1
C6
4700pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H472
KA01D
1
C7
2200pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H222
KA01D
1
C8, C13, C14,
C20, C21, C55,
C62, C63, C64,
C65, C67
1000pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H102
KA01D
11
C9, C11, C17,
C19, C59
0.22uF
0603
Ceramic, X7R, 25V, 10%
Taiyo Yuden
TMK107B7224KA
-T
5
C22, C23, C24,
C25, C26, C27,
C28, C29
4.7uF
1210
Ceramic, X7R, 25V, 10%
Taiyo Yuden
TMK325B7475KN
-T
8
C30, C31, C32,
C33
680pF
0603
Ceramic, C0G/NP0, 50V, 5%
TDK
C1608C0G1H681
J
4
C34, C35, C36,
C37
0.15uF
0603
Ceramic, X7R, 25V, 10%
MuRata
GRM188R71E154
KA01D
4
C38, C39, C42,
C43, C46, C47,
C50, C51
22uF
1210
Ceramic, X7R, 16V, 10%
MuRata
GRM32ER71C22
6KE18L
8
C40, C41, C44,
C45, C48, C49,
C52, C53
220uF
UE
SP, 4V, 20%, 0.005 Ohm ESR
Panasonic
EEF-SE0G221R
8
C56, C68
0.1uF
0603
Ceramic, X7R, 25V, 10%
MuRata
GRM188R71E104
KA01D
2
C58
2.2uF
0805
Ceramic, X7R, 16V, 10%
TDK
C2012X7R1C225
K
1
C60
470pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H471
KA01D
1
C61
0.01uF
0603
Ceramic, X7R, 50V, 10%
TDK
C1608X7R1H103
K
1
C66
1uF
1206
Ceramic, X7R, 25V, 10%
AVX
12063C105KAT2
A
1
D1, D2, D3, D4,
D5, D6, D7, D8,
D9
0.47V
SOD-323
Vr = 40V, Io = 0.5A, Vf = 0.47V
Central
Semiconductor
CMDSH05-4
9
D14
1.25V
SOD-123
Vr = 100V, Io = 0.15A, Vf = 1.25V
Diodes Inc.
1N4148W-7-F
1
H1, H2
Mach Screw, Round, #10-32 x 3/8,
Brass
2EA13
2
H3, H4
Mach Screw, Round, #1/4-20 x 1/2,
Brass
2EA30
2
H5, H6
Lock Nut, #10-32, Stainless Steel
1EY35
2
H7, H8
Lock Nut, #1/4-20, Brass
1FA58
2
H9, H10, H11,
H12
Machine Screw, Round, #4-40 x 1/4,
Nylon
4DFG1
4
H13, H14, H15,
H16
Standoff Hex 0.5"L #4-40 Nylon
1902C
4
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Table 1. Bill of Materials for LM3753 Evaluation Board (continued)
Designator
Value
J1, J3, J5, J7, J9
1x2
L1, L2, L3, L4
440nH
LED1, LED2
Green
LED3
Red
Package
Description
Manufacturer
Part Number
QTY
Header, TH, 100mil, 1x2, Tin plated
Samtec Inc.
TSW-102-07-T-S
5
PA1513
Power Beads, 440nH, 0.32 mOhm
Pulse Engineering
PA0513.441NLT
4
Power
TOPLED
w/lens
0.114W, 3.8V
OSRAM
LT E63C-BACB35-L-Z
2
Power
TOPLED
w/lens
0.1075W, 2.15V
OSRAM
LS E63F-DBFA-1Z
1
Header, 24-Pin, Right Angle
Tyco Electronics
1-87230-2
1
P1
Receptacle 24-Pin, Right Angle
Tyco Electronics
5535512-3
1
Q1
P2
NPN
DPAK
NPN, 8A, 80V
Central
Semiconductor
CJD44H11
1
Q2, Q5, Q8, Q11
25V
PowerPA
K SO-8
30A, 8.5nC, 7 mOHM
Vishay-Siliconix
SiR850DP
4
Q3, Q4, Q6, Q7,
Q9, Q10, Q12,
Q13, Q14, Q15,
Q16, Q17
25V
PowerPA
K SO-8
50A, 20 nC, 3 mOHM
Vishay-Siliconix
SiR892DP
12
R1, R7, R8, R60,
R61, R62, R80
10k
0603
5%, 0.1W
Vishay-Dale
CRCW060310K0J
NEA
7
R2, R16, R31,
R32, R33, R34
2.2
0603
5%, 0.1W
Vishay-Dale
CRCW06032R20J
NEA
6
R3, R55
2.4k
0603
5%, 0.1W
Vishay-Dale
CRCW06032K40J
NEA
2
R4, R5
1.0k
0603
5%, 0.1W
Vishay-Dale
CRCW06031K00J
NEA
2
R6, R35, R36,
R37, R38, R51,
R52, R53, R54,
R58, R79
1.0
0603
5%, 0.1W
Vishay-Dale
CRCW06031R00J
NEA
11
R9, R13
3.01k
0603
0.1%, 0.1W
Yageo America
RT0603BRD073K
01L
2
R10
240
0603
5%, 0.1W
Vishay-Dale
CRCW0603240RJ
NEA
1
R11
6.2k
0603
5%, 0.1W
Vishay-Dale
CRCW06036K20J
NEA
1
R12
30.1k
0603
1%, 0.1W
Vishay-Dale
CRCW060330K1
FKEA
1
R14
35.7k
0603
1%, 0.1W
Vishay-Dale
CRCW060335K7
FKEA
1
R15
10.0k
0603
1%, 0.1W
Vishay-Dale
CRCW060310K0
FKEA
1
R17, R25
78.7k
0603
1%, 0.1W
Vishay-Dale
CRCW060378K7
FKEA
2
R18, R26
200
TS53Y
Pot 5mm Sq Cermet
Vishay-Sfernice
TS53YL201
2
R19, R27
191
0603
1%, 0.1W
Vishay-Dale
CRCW0603191R
FKEA
2
R20, R21, R28
4.02k
0603
1%, 0.1W
Vishay-Dale
CRCW06034K02
FKEA
3
R22
1.37k
0603
1%, 0.1W
Vishay-Dale
CRCW06031K37
FKEA
1
R24, R30
0
0603
5%, 0.1W
Vishay-Dale
CRCW06030000Z
0EA
2
R39, R42, R45,
R48
5.90k
0603
1%, 0.1W
Vishay-Dale
CRCW06035K90
FKEA
4
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Evaluation Board Schematic
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Table 1. Bill of Materials for LM3753 Evaluation Board (continued)
Designator
Value
Package
Description
Manufacturer
Part Number
QTY
R40, R43, R46,
R49
10.5k
0603
1%, 0.1W
Vishay-Dale
CRCW060310K5
FKEA
4
R41, R44, R47,
R50
0.001
WSK2512
1%, 1W
Vishay-Dale
WSK25121L000F
EA
4
R56
470k
0603
5%, 0.1W
Vishay-Dale
CRCW0603470KJ
NEA
1
R57
12k
0603
5%, 0.1W
Vishay-Dale
CRCW060312K0J
NEA
1
R59
51
0603
5%, 0.1W
Vishay-Dale
CRCW060351R0J
NEA
1
R63, R64, R65,
R66, R67, R68,
R69, R70, R71,
R72, R73, R74
0.3
2512
1%, 1W
Panasonic
ERJ-1TRQFR30U
12
R75, R76, R77,
R78
1.00k
0603
1%, 0.1W
Vishay-Dale
CRCW06031K00
FKEA
4
5%, 0.25W
Panasonic
ERD-S2TJ121V
1
0603
Thermistor, 47K, 2%, B25/50 4050,
0.1W
MuRata
NCP18WB473J03
RB
4
Shunt, 100mil, Tin plated, Black
Amp
2-382811-1
5
Switch, DPDT, 3 Position
NKK
G3T23AP-RO
1
2
R101
120
RT1, RT2, RT3,
RT4
47k
SH-J1, SH-J3,
SH-J5, SH-J7,
SH-J9
1x2
SW1
14
T1, T2
50A
Terminal 50A Lug
Panduit
CB35-36-CY
T3, T4
90A
Terminal 90A Lug
Panduit
CB70-14-CY
2
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10, TP11,
TP12, TP13,
TP14, TP38,
TP39, TP40,
TP41, TP42,
TP43, TP44
Triple
Terminal, Turret, TH, Triple
Keystone
Electronics
1598-2
21
TP15, TP16,
TP18, TP19,
TP20, TP21,
TP22, TP24,
TP25, TP26,
TP27, TP28,
TP29, TP30,
TP32, TP34,
TP36
White
Test Point, TH, Multipurpose, White
Keystone
Electronics
5012
17
TP17, TP23,
TP31, TP33,
TP35, TP37
Black
Test Point, TH, Multipurpose, Black
Keystone
Electronics
5011
6
U1, U2
LM3753
SQA32A
Multi-Phase Buck Controller
National
Semiconductor
LM3753SQ
2
U3
LM26LV
105°C
SDB06A
1.6V, LLP-6 Factory Preset
Temperature Switch and Temperature
Sensor
National
Semiconductor
LM26LVCISD-105
1
U4
LMC555
MUA08A
CMOS Timer
National
Semiconductor
LMC555CMM
1
U5
LM2722
2
M08A
High-Speed 4.5A Synchronous
MOSFET Driver
National
Semiconductor
LM27222M
1
AN-2021 LM3753/54 Evaluation Board
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Evaluation Board Schematic
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Table 2. Bill of Materials for LM3754 Evaluation Board
Designator
Value
Package
Description
Manufacturer
Part Number
QTY
C1
470uF
SMT
Radial G
AL, 25V, 20%, 0.06 Ohm ESR
Panasonic
EEE-FP1E471AP
1
C2, C15
1uF
0603
Ceramic, X7R, 16V, 10%
TDK
C1608X7R1C105
K
2
C3, C10, C16,
C18
4.7uF
0805
Ceramic, X7R, 16V, 10%
MuRata
GRM21BR71C47
5KA73L
4
C4
0.047uF
0603
Ceramic, X7R, 25V, 10%
TDK
C1608X7R1E473
K
1
C5
100pF
0603
Ceramic, C0G/NP0, 50V, 5%
TDK
C1608C0G1H101
J
1
C6
4700pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H472
KA01D
1
C7
2200pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H222
KA01D
1
C8, C13, C14,
C20, C21, C55,
C62, C63, C64,
C65, C67
1000pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H102
KA01D
11
C9, C11, C17,
C19, C59
0.22uF
0603
Ceramic, X7R, 25V, 10%
Taiyo Yuden
TMK107B7224KA
-T
5
C12, C56, C68
0.1uF
0603
Ceramic, X7R, 25V, 10%
MuRata
GRM188R71E104
KA01D
3
C22, C23, C24,
C25, C26, C27,
C28, C29
4.7uF
1210
Ceramic, X7R, 25V, 10%
Taiyo Yuden
TMK325B7475KN
-T
8
C30, C31, C32,
C33
680pF
0603
Ceramic, C0G/NP0, 50V, 5%
TDK
C1608C0G1H681
J
4
C34, C35, C36,
C37
0.15uF
0603
Ceramic, X7R, 25V, 10%
MuRata
GRM188R71E154
KA01D
4
C38, C39, C42,
C43, C46, C47,
C50, C51
22uF
1210
Ceramic, X7R, 16V, 10%
MuRata
GRM32ER71C22
6KE18L
8
C40, C41, C44,
C45, C48, C49,
C52, C53
220uF
UE
SP, 4V, 20%, 0.005 Ohm ESR
Panasonic
EEF-SE0G221R
8
C58
2.2uF
0805
Ceramic, X7R, 16V, 10%
TDK
C2012X7R1C225
K
1
C60
470pF
0603
Ceramic, X7R, 50V, 10%
MuRata
GRM188R71H471
KA01D
1
C61
0.01uF
0603
Ceramic, X7R, 50V, 10%
TDK
C1608X7R1H103
K
1
C66
1uF
1206
Ceramic, X7R, 25V, 10%
AVX
12063C105KAT2
A
1
D1, D2, D3, D4,
D5, D6, D7, D8,
D9
0.47V
SOD-323
Vr = 40V, Io = 0.5A, Vf = 0.47V
Central
Semiconductor
CMDSH05-4
9
D14
1.25V
SOD-123
Vr = 100V, Io = 0.15A, Vf = 1.25V
Diodes Inc.
1N4148W-7-F
1
H1, H2
Mach Screw, Round, #10-32 x 3/8,
Brass
2EA13
2
H3, H4
Mach Screw, Round, #1/4-20 x 1/2,
Brass
2EA30
2
H5, H6
Lock Nut, #10-32, Stainless Steel
1EY35
2
H7, H8
Lock Nut, #1/4-20, Brass
1FA58
2
H9, H10, H11,
H12
Machine Screw, Round, #4-40 x 1/4,
Nylon
4DFG1
4
H13, H14, H15,
H16
Standoff Hex 0.5"L #4-40 Nylon
1902C
4
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15
Evaluation Board Schematic
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Table 2. Bill of Materials for LM3754 Evaluation Board (continued)
Designator
Value
J1, J3, J5, J7, J9
1x2
L1, L2, L3, L4
440nH
LED1, LED2
Green
LED3
Red
Package
Description
Manufacturer
Part Number
QTY
Header, TH, 100mil, 1x2, Tin plated
Samtec Inc.
TSW-102-07-T-S
5
PA1513
Power Beads, 440nH, 0.32 mOhm
Pulse Engineering
PA0513.441NLT
4
Power
TOPLED
w/lens
0.114W, 3.8V
OSRAM
LT E63C-BACB35-L-Z
2
Power
TOPLED
w/lens
0.1075W, 2.15V
OSRAM
LS E63F-DBFA-1Z
1
Header, 24-Pin, Right Angle
Tyco Electronics
1-87230-2
1
P1
P2
16
Receptacle 24-Pin, Right Angle
Tyco Electronics
5535512-3
1
Q1
NPN
DPAK
NPN, 8A, 80V
Central
Semiconductor
CJD44H11
1
Q2, Q5, Q8, Q11
25V
PowerPA
K SO-8
30A, 8.5nC, 7 mOHM
Vishay-Siliconix
SiR850DP
4
Q3, Q4, Q6, Q7,
Q9, Q10, Q12,
Q13, Q14, Q15,
Q16, Q17
25V
PowerPA
K SO-8
50A, 20 nC, 3 mOHM
Vishay-Siliconix
SiR892DP
12
R1, R7, R8, R60,
R61, R62, R80
10k
0603
5%, 0.1W
Vishay-Dale
CRCW060310K0J
NEA
7
R2, R16, R31,
R32, R33, R34
2.2
0603
5%, 0.1W
Vishay-Dale
CRCW06032R20J
NEA
6
R3, R55
2.4k
0603
5%, 0.1W
Vishay-Dale
CRCW06032K40J
NEA
2
R4, R5
1.0k
0603
5%, 0.1W
Vishay-Dale
CRCW06031K00J
NEA
2
R6, R35, R36,
R37, R38, R51,
R52, R53, R54,
R58, R79
1.0
0603
5%, 0.1W
Vishay-Dale
CRCW06031R00J
NEA
11
R9, R13
3.01k
0603
0.1%, 0.1W
Yageo America
RT0603BRD073K
01L
2
R10
240
0603
5%, 0.1W
Vishay-Dale
CRCW0603240RJ
NEA
1
R11
6.2k
0603
5%, 0.1W
Vishay-Dale
CRCW06036K20J
NEA
1
R12
30.1k
0603
1%, 0.1W
Vishay-Dale
CRCW060330K1
FKEA
1
R17, R25
78.7k
0603
1%, 0.1W
Vishay-Dale
CRCW060378K7
FKEA
2
R18, R26
200
TS53Y
Pot 5mm Sq Cermet
Vishay-Sfernice
TS53YL201
2
R19, R27
191
0603
1%, 0.1W
Vishay-Dale
CRCW0603191R
FKEA
2
R20, R21, R28
4.02k
0603
1%, 0.1W
Vishay-Dale
CRCW06034K02
FKEA
3
R22
1.37k
0603
1%, 0.1W
Vishay-Dale
CRCW06031K37
FKEA
1
R24, R30
0
0603
5%, 0.1W
Vishay-Dale
CRCW06030000Z
0EA
2
R39, R42, R45,
R48
5.90k
0603
1%, 0.1W
Vishay-Dale
CRCW06035K90
FKEA
4
R40, R43, R46,
R49
10.5k
0603
1%, 0.1W
Vishay-Dale
CRCW060310K5
FKEA
4
R41, R44, R47,
R50
0.001
WSK2512
1%, 1W
Vishay-Dale
WSK25121L000F
EA
4
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Table 2. Bill of Materials for LM3754 Evaluation Board (continued)
Designator
Value
Package
Description
Manufacturer
Part Number
QTY
R56
470k
0603
5%, 0.1W
Vishay-Dale
CRCW0603470KJ
NEA
1
R57
12k
0603
5%, 0.1W
Vishay-Dale
CRCW060312K0J
NEA
1
R59
51
0603
5%, 0.1W
Vishay-Dale
CRCW060351R0J
NEA
1
R63, R64, R65,
R66, R67, R68,
R69, R70, R71,
R72, R73, R74
0.3
2512
1%, 1W
Panasonic
ERJ-1TRQFR30U
12
R75, R76, R77,
R78
1.00k
0603
1%, 0.1W
Vishay-Dale
CRCW06031K00
FKEA
4
5%, 0.25W
Panasonic
ERD-S2TJ121V
1
0603
Thermistor, 47K, 2%, B25/50 4050,
0.1W
MuRata
NCP18WB473J03
RB
4
Shunt, 100mil, Tin plated, Black
Amp
2-382811-1
5
Switch, DPDT, 3 Position
NKK
G3T23AP-RO
1
Terminal 50A Lug
Panduit
CB35-36-CY
2
R101
120
RT1, RT2, RT3,
RT4
47k
SH-J1, SH-J3,
SH-J5, SH-J7,
SH-J9
1x2
SW1
T1, T2
50A
T3, T4
90A
Terminal 90A Lug
Panduit
CB70-14-CY
2
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10, TP11,
TP12, TP14,
TP38, TP39,
TP40, TP41,
TP42, TP43,
TP44
Triple
Terminal, Turret, TH, Triple
Keystone
Electronics
1598-2
20
TP15, TP16,
TP18, TP19,
TP20, TP21,
TP22, TP24,
TP25, TP26,
TP27, TP28,
TP29, TP30,
TP32, TP34,
TP36
White
Test Point, TH, Multipurpose, White
Keystone
Electronics
5012
17
TP17, TP23,
TP31, TP33,
TP35, TP37
Black
Test Point, TH, Multipurpose, Black
Keystone
Electronics
5011
6
U1, U2
LM3754
SQA32A
Multi-Phase Buck Controller
National
Semiconductor
LM3754SQ
2
U3
LM26LV
105°C
SDB06A
1.6V, LLP-6 Factory Preset
Temperature Switch and Temperature
Sensor
National
Semiconductor
LM26LVCISD-105
1
U4
LMC555
MUA08A
CMOS Timer
National
Semiconductor
LMC555CMM
1
U5
LM2722
2
M08A
High-Speed 4.5A Synchronous
MOSFET Driver
National
Semiconductor
LM27222M
1
SNVA420 – December 2009
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17
PCB Layout
6
www.ti.com
PCB Layout
Figure 6. Top Layer Components and Overlay
18
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PCB Layout
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Figure 7. Top Layer Copper
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PCB Layout
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Figure 8. Mid Layer 1 Copper
20
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PCB Layout
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Figure 9. Mid Layer 2 Copper
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PCB Layout
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Figure 10. Bottom Layer Copper as Viewed From Top
22
AN-2021 LM3753/54 Evaluation Board
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PCB Layout
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Figure 11. Bottom Layer Components and Overlay as Viewed From Top
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23
STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES
1.
Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or
documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein.
Acceptance of the EVM is expressly subject to the following terms and conditions.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms and conditions that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2
Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms and conditions do not apply to Software. The warranty, if any, for Software is covered in the applicable Software
License Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for any defects that are caused by neglect, misuse or mistreatment
by an entity other than TI, including improper installation or testing, or for any EVMs that have been altered or modified in any
way by an entity other than TI. Moreover, TI shall not be liable for any defects that result from User's design, specifications or
instructions for such EVMs. Testing and other quality control techniques are used to the extent TI deems necessary or as
mandated by government requirements. TI does not test all parameters of each EVM.
2.3 If any EVM fails to conform to the warranty set forth above, TI's sole liability shall be at its option to repair or replace such EVM,
or credit User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the
warranty period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to
repair or replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall
be warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
3
Regulatory Notices:
3.1 United States
3.1.1
Notice applicable to EVMs not FCC-Approved:
This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit
to determine whether to incorporate such items in a finished product and software developers to write software applications for
use with the end product. This kit is not a finished product and when assembled may not be resold or otherwise marketed unless
all required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product not cause
harmful interference to licensed radio stations and that this product accept harmful interference. Unless the assembled kit is
designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must operate under the authority of
an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2
For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
FCC Interference Statement for Class B EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
•
•
•
•
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
3.2 Canada
3.2.1
For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210
Concerning EVMs Including Radio Transmitters:
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Concernant les EVMs avec appareils radio:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation
est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit
accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concerning EVMs Including Detachable Antennas:
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)
gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type
and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for
successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types
listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.
Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited
for use with this device.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et
d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage
radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope
rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le
présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le
manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne
non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de
l'émetteur
3.3 Japan
3.3.1
Notice for EVMs delivered in Japan: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 日本国内に
輸入される評価用キット、ボードについては、次のところをご覧ください。
http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page
3.3.2
Notice for Users of EVMs Considered “Radio Frequency Products” in Japan: EVMs entering Japan may not be certified
by TI as conforming to Technical Regulations of Radio Law of Japan.
If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required by Radio Law of
Japan to follow the instructions below with respect to EVMs:
1.
2.
3.
Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal
Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for
Enforcement of Radio Law of Japan,
Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to
EVMs, or
Use of EVMs only after User obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan
with respect to EVMs. Also, do not transfer EVMs, unless User gives the same notice above to the transferee. Please note
that if User does not follow the instructions above, User will be subject to penalties of Radio Law of Japan.
SPACER
SPACER
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【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて
いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの
措置を取っていただく必要がありますのでご注意ください。
1.
2.
3.
電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用
いただく。
実験局の免許を取得後ご使用いただく。
技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ
ンスツルメンツ株式会社
東京都新宿区西新宿６丁目２４番１号
西新宿三井ビル
3.3.3
Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ
い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
SPACER
4
EVM Use Restrictions and Warnings:
4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT
LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling
or using the EVM, including without limitation any warning or restriction notices. The notices contain important safety information
related to, for example, temperatures and voltages.
4.3 Safety-Related Warnings and Restrictions:
4.3.1
User shall operate the EVM within TI’s recommended specifications and environmental considerations stated in the user
guide, other available documentation provided by TI, and any other applicable requirements and employ reasonable and
customary safeguards. Exceeding the specified performance ratings and specifications (including but not limited to input
and output voltage, current, power, and environmental ranges) for the EVM may cause personal injury or death, or
property damage. If there are questions concerning performance ratings and specifications, User should contact a TI
field representative prior to connecting interface electronics including input power and intended loads. Any loads applied
outside of the specified output range may also result in unintended and/or inaccurate operation and/or possible
permanent damage to the EVM and/or interface electronics. Please consult the EVM user 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, even with the inputs and outputs kept within the specified allowable ranges, some circuit
components may have elevated case temperatures. These components include but are not limited to linear regulators,
switching transistors, pass transistors, current sense resistors, and heat sinks, which can be identified using the
information in the associated documentation. When working with the EVM, please be aware that the EVM may become
very warm.
4.3.2
EVMs are intended solely for use by technically qualified, professional electronics experts who are familiar with the
dangers and application risks associated with handling electrical mechanical components, systems, and subsystems.
User assumes all responsibility and liability for proper and safe handling and use of the EVM by User or its employees,
affiliates, contractors or designees. User assumes all responsibility and liability to ensure that any interfaces (electronic
and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely
limit accessible leakage currents to minimize the risk of electrical shock hazard. User assumes all responsibility and
liability for any improper or unsafe handling or use of the EVM by User or its employees, affiliates, contractors or
designees.
4.4 User assumes all responsibility and liability to determine whether the EVM is subject to any applicable international, federal,
state, or local laws and regulations related to User’s handling and use of the EVM and, if applicable, User assumes all
responsibility and liability for compliance in all respects with such laws and regulations. User assumes all responsibility and
liability for proper disposal and recycling of the EVM consistent with all applicable international, federal, state, and local
requirements.
5.
Accuracy of Information: To the extent TI provides information on the availability and function of EVMs, TI attempts to be as accurate
as possible. However, TI does not warrant the accuracy of EVM descriptions, EVM availability or other information on its websites as
accurate, complete, reliable, current, or error-free.
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6.
Disclaimers:
6.1 EXCEPT AS SET FORTH ABOVE, EVMS AND ANY WRITTEN DESIGN MATERIALS PROVIDED WITH THE EVM (AND THE
DESIGN OF THE EVM ITSELF) ARE PROVIDED "AS IS" AND "WITH ALL FAULTS." TI DISCLAIMS ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, REGARDING SUCH ITEMS, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF ANY
THIRD PARTY PATENTS, COPYRIGHTS, TRADE SECRETS OR OTHER INTELLECTUAL PROPERTY RIGHTS.
6.2 EXCEPT FOR THE LIMITED RIGHT TO USE THE EVM SET FORTH HEREIN, NOTHING IN THESE TERMS AND
CONDITIONS SHALL BE CONSTRUED AS GRANTING OR CONFERRING ANY RIGHTS BY LICENSE, PATENT, OR ANY
OTHER INDUSTRIAL OR INTELLECTUAL PROPERTY RIGHT OF TI, ITS SUPPLIERS/LICENSORS OR ANY OTHER THIRD
PARTY, TO USE THE EVM IN ANY FINISHED END-USER OR READY-TO-USE FINAL PRODUCT, OR FOR ANY
INVENTION, DISCOVERY OR IMPROVEMENT MADE, CONCEIVED OR ACQUIRED PRIOR TO OR AFTER DELIVERY OF
THE EVM.
7.
USER'S INDEMNITY OBLIGATIONS AND REPRESENTATIONS. USER WILL DEFEND, INDEMNIFY AND HOLD TI, ITS
LICENSORS AND THEIR REPRESENTATIVES HARMLESS FROM AND AGAINST ANY AND ALL CLAIMS, DAMAGES, LOSSES,
EXPENSES, COSTS AND LIABILITIES (COLLECTIVELY, "CLAIMS") ARISING OUT OF OR IN CONNECTION WITH ANY
HANDLING OR USE OF THE EVM THAT IS NOT IN ACCORDANCE WITH THESE TERMS AND CONDITIONS. THIS OBLIGATION
SHALL APPLY WHETHER CLAIMS ARISE UNDER STATUTE, REGULATION, OR THE LAW OF TORT, CONTRACT OR ANY
OTHER LEGAL THEORY, AND EVEN IF THE EVM FAILS TO PERFORM AS DESCRIBED OR EXPECTED.
8.
Limitations on Damages and Liability:
8.1 General Limitations. IN NO EVENT SHALL TI BE LIABLE FOR ANY SPECIAL, COLLATERAL, INDIRECT, PUNITIVE,
INCIDENTAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES IN CONNECTION WITH OR ARISING OUT OF THESE
TERMS ANDCONDITIONS OR THE USE OF THE EVMS PROVIDED HEREUNDER, REGARDLESS OF WHETHER TI HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED
TO, COST OF REMOVAL OR REINSTALLATION, ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES, RETESTING, OUTSIDE COMPUTER TIME, LABOR COSTS, LOSS OF GOODWILL, LOSS OF PROFITS,
LOSS OF SAVINGS, LOSS OF USE, LOSS OF DATA, OR BUSINESS INTERRUPTION. NO CLAIM, SUIT OR ACTION SHALL
BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED.
8.2 Specific Limitations. IN NO EVENT SHALL TI'S AGGREGATE LIABILITY FROM ANY WARRANTY OR OTHER OBLIGATION
ARISING OUT OF OR IN CONNECTION WITH THESE TERMS AND CONDITIONS, OR ANY USE OF ANY TI EVM
PROVIDED HEREUNDER, EXCEED THE TOTAL AMOUNT PAID TO TI FOR THE PARTICULAR UNITS SOLD UNDER
THESE TERMS AND CONDITIONS WITH RESPECT TO WHICH LOSSES OR DAMAGES ARE CLAIMED. THE EXISTENCE
OF MORE THAN ONE CLAIM AGAINST THE PARTICULAR UNITS SOLD TO USER UNDER THESE TERMS AND
CONDITIONS SHALL NOT ENLARGE OR EXTEND THIS LIMIT.
9.
Return Policy. Except as otherwise provided, TI does not offer any refunds, returns, or exchanges. Furthermore, no return of EVM(s)
will be accepted if the package has been opened and no return of the EVM(s) will be accepted if they are damaged or otherwise not in
a resalable condition. If User feels it has been incorrectly charged for the EVM(s) it ordered or that delivery violates the applicable
order, User should contact TI. All refunds will be made in full within thirty (30) working days from the return of the components(s),
excluding any postage or packaging costs.
10. Governing Law: These terms and conditions shall be governed by and interpreted in accordance with the laws of the State of Texas,
without reference to conflict-of-laws principles. User agrees that non-exclusive jurisdiction for any dispute arising out of or relating to
these terms and conditions lies within courts located in the State of Texas and consents to venue in Dallas County, Texas.
Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief
in any United States or foreign court.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2015, Texas Instruments Incorporated
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TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
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TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
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