description kit contents performance summary a · 2 1 r2 res., 0Ω, 5%, 1/16w, 0402 rohm,...
TRANSCRIPT
1
DEMO MANUAL DC2769A-B-KIT
Rev. 0
DESCRIPTION
LTC6990/LTC4124 25mA Wireless Li-Ion Charger
Demonstration Kit
DC2769A-B-KIT is a kit of the DC2771A-B transmitter board, featuring LTC®6990 and the DC2775A-B, featuring LTC4124. The DC2775A-B receiver can charge a single
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
KIT CONTENTS
BOARD PHOTO
Li-Ion battery at up to 25mA with an air gap of 2mm to 5mm between the transmit and receive coils.
Design files for this circuit board kit are available.
Specifications are at TA = 25°C
Figure 1. DC2771A-B Picture Figure 2. DC2775A-B Picture
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN DC2771A-B Voltage Input IVIN ≤ 100mA 4.5 5.5 V
IIN DC2771A-B VIN Current VIN = 5V 200 mA
VBAT DC2775A-B Battery Charge Voltage VSEL1 = HI, VSEL2 = HI 4.35 V
VSEL1 = HI, VSEL2 = LO 4.20 V
VSEL1 = LO, VSEL2 = HI 4.1 V
VSEL1 = LO, VSEL2 = LO 4.00 V
IBAT DC2775A-B Charge Current VBAT = 4.0V, ISEL1 = GND, ISEL2 = VCC 25 mA
Air-Gap Separation Between LTX and LRX 2.0 3.0 5.0 mm
fDRIVE DC2771A-B Drive Frequency 200 kHz
fTX_TANK DC2771A-B Resonant Tank Frequency 250 kHz
fRX_TANK DC2775A-B Resonant Tank Frequency 200 kHz
1 × DC2771A-B (LTC6990) Transmitter Demo Board 1 × DC2775A-B (LTC4124) Receiver Demo Board
2
DEMO MANUAL DC2769A-B-KIT
Rev. 0
QUICK START PROCEDURERefer to Figure 4 to Figure 7 for the proper measurement equipment setup, DC2775A-B mounting on DC2771A-B, and follow the procedure below:
NOTE. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the sig-nal and GND terminals. See Figure 8 for proper scope probe technique.
1. Plug a Micro-USB cable into DC2771A-B.J1 connector, with the other end of the cable connected to a com-puter USB port or a 5V USB power adapter. The demo may also be powered by a 5V supply PS2 connecting between VIN and GND turrets (Figure 5).
2. The default battery charge voltage is 4.2V and the charging current is 25mA. Battery charge voltage, charge current, pre-charge feature and low battery disconnect voltage can be programmed by jumpers on the DC2775A-B board.
3. Connect a voltage source PS1 and a 100Ω resistor RBAT1 between the BAT and GND turrets of DC2775A-B, respectively (Figure 4). PS1 and RBAT1 make up the battery emulator. Typical power supplies cannot sink current. By adding a resistor across the power supply inputs that draws more current than the maximum bat-tery charging current, the power supply only sources current even when the battery charge current is at its maximum value.
4. Connect an ammeter AM1 between PS1 and the DC2775A-B BAT turret. Connect a voltmeter VM1 between DC2775A-B BAT and GND turrets.
5. Set PS1 = 3.7V. If PS2 is used instead of Micro-USB, set PS2 = 5V and turn on both power supplies simultaneously.
6. DC2771A-B.D1 LED should be turned on. DC2775A-B.D1 LED should start blinking intermittently. AM1 should be reading 25mA. If the AM1 meter reads much less than 25mA, read VM1 and check whether LTC4124 is in constant current mode (Figure 4).
7. Turn off PS1 and PS2 simultaneously.
Figure 3. Battery Charge Current vs BAT Pin Voltage
BATTERY VOLTAGE(% OF FINAL CHARGE VOLTAGE)
50
100
90
70
40
50
20
80
60
30
10
080
DC2769AB F03
1109070 10060
BATT
ERY
CHAR
GE C
URRE
NT(%
OF
PROG
RAM
MED
CHA
RGE
CURR
ENT)
3
DEMO MANUAL DC2769A-B-KIT
Rev. 0
QUICK START PROCEDURE
Figure 4. DC2775A-B Top
+ –
+
–
AMI
BATTERY EMULATOR
VMIRBAT1100Ω
PS13.7V DC
0.5A
4
DEMO MANUAL DC2769A-B-KIT
Rev. 0
Figure 5. DC2771A-B Top
Figure 6. DC2775A-B on top of DC2771A-B
PS25.0V DC
0.1A
CONNECT TO A 5V POWER SUPPLY TO VIN AND GND TURRENTS
OR
+
–POWER DC2771A-B USING MICRO-USB
CABLE TO HOST OR A 5V ADAPTER.
QUICK START PROCEDURE
5
DEMO MANUAL DC2769A-B-KIT
Rev. 0
HARDWARE SETUP
Figure 7. Measuring Input or Output Ripple
Note: All connections from equipment should be Kelvin connected directly to the board pins which they are connected on this diagram and any input or output leads should be twisted pair.
6
DEMO MANUAL DC2769A-B-KIT
Rev. 0
OPERATIONThe DC2769A-B-KIT demonstrates operation of a mag-netically coupled resonant Wireless Power Transfer (WPT) system. The LTC6990 based transmitter provides efficient wireless power for the LTC4124 receiver to charge the Li-Ion battery.
DC2771A-B – Wireless Power Transmitter Board Featuring the LTC6990
The DC2771A-B is a wireless power transmitter board using LTC6990 oscillator. The NMOS, M1(see DC2771A-B schematic on Page 8), is driven by a 50% duty cycle square wave generated by the oscillator. During the first half of the cycle, M1 is switched on and the current through the LC resonant tank rises linearly. During the second half of the cycle, M1 is switched off and the current cir-culates through the LC resonant tank. If the transmit LC tank frequency is set to 1.29 times the driving frequency, which is 1MHz in this application, switching losses in M1 are significantly reduced due to the zero-voltage switching (ZVS). Figure 8 illustrates the ZVS operation in DC2771A-B. The peak voltage of the transmit resonant tank that appears at the drain of M1 is:
VIN = 1.038•π•VIN
This equation is derived by performing voltage second balance equation on the resonant tank inductor.
VGS_M12V/DIV
VDS_M15V/DIV
DC2769AB F08
Figure 8. ZVS Operation on M1 when fTX_TANK = 1.29 • fDRIVEZVS OO
DC2775A-B – Wireless Power Receiver Board Featuring the LTC4124
The DC2775A-B demo board implements a parallel reso-nant LC circuit that connects the LTC4124 between ACIN and GND pins. The AC waveform on the resonant circuit is rectified by the internal wireless power managing cir-cuitry to DC voltage on VCC pin. This DC source is then fed into the internal linear battery charger to charge a Li-Ion battery.
As shown in Figure 9, when the LTC4124 receives more energy than it needs to charge the battery, the wireless power manager in the IC keeps the input voltage to the IC, VCC, low by shunting the receiver resonant tank to ground. In this way, the linear charger is highly efficient as its input is always kept just above the battery voltage, VBAT. The resonant tank also receives less power when the shunting circuit is engaged, as the resonant frequency is detuned from the transmitter frequency.
The LTC4124 includes a full featured CC/CV (Constant Current/Constant Voltage) linear battery charger with trickle current pre-charge, safety timer termination, bad battery detection, temperature qualified safe charging and automatic recharge. The maximum charge current sup-ported by DC2775A-B is 25mA and the charge voltage is programmable by VSELX jumpers.
VCC2V/DIV
VACIN2V/DIV
VBAT2V/DIV
DC2769AA F09
Figure 9. Rectification of AC Input and Regulation of VCC
7
DEMO MANUAL DC2769A-B-KIT
Rev. 0
PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC2771A-B: Required Circuit Components
1 1 C1 CAP., 4.7μF, X5R, 10V, 10%, 0402 TDK, C1005X5R1A475K050BC
2 1 C2 CAP., 10μF, X5R, 6.3V, 20%, 0402 MURATA, GRJ155R60J106ME11D
3 1 C3 CAP., 10μF, X5R, 16V, 20%, 1206 TDK, C3216X5R1C106M160AA
4 1 CTx1 CAP., 0.047μF, C0G, 50V, 5%, 1206 MURATA, GCM31M5C1H473JA16L
5 1 CTx2 CAP., 0.01μF, C0G, 25V, 5%, 0603 KEMET, C0603C103J3GACTU
6 1 LTx1 IND., 6.8μH, WIRELESS CHRG. COIL TX., 10%, 2.5A, 125mΩ, 20.5mm DIA × 2.6mm H, 1 COIL, 1 LAYER
WURTH ELEKTRONIK, 760308101104
7 1 M1 XSTR., MOSFET, N-CH, 20V, 1.4A, SOT-323, AEC-Q200 INFINEON, BSS816NWH6327XTSA1
8 1 R1 RES., 243k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2433TRF
9 1 R2 RES., 2.2k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022K20JNED
10 1 R3 RES., 1Ω, 1%, 1/16W, 0402, ±100ppm, AEC-Q200 VISHAY, CRCW04021R00FKED
11 1 U1 OSCILLATOR, TIMERBLOX: VCO, 5pF, 90ppm, DFN-5 ANALOG DEVICES, INC., LTC6990CDCB#PBF
Additional Demo Board Circuit Components
1 1 D1 LED, RED, WATER-CLEAR, 0603 LITE-ON, LTST-C193KRKT-5A
Hardware: For Demo Board Only
1 2 E1, E2 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2308-2-00-80-00-00-07-0
2 1 J1 CONN., μUSB 2.0, RCPT., 5 PINS, 1 PORT, REVERSE MOUNT, R/A HORZ., TYPE B, FLANGELESS
TE CONNECTIVITY, 1932788-1
DC2775A-B: Required Circuit Components
1 1 C3 CAP., 2.2μF, X5R, 25V, 10%, 0603 MURATA, GRM188R61E225KA12D
2 1 CRx2 CAP., 0.047μF, C0G, 25V, 5%, 0805 KEMET, C0805C473J3GACAUTO
3 1 LRx1 IND., 13μH, WIRELESS CHRG. COIL RX. Qi, 10%, 0.8A, 500mΩ, 10mm DIA x 1.68mm H, 1 COIL, 1 LAYER
WURTH ELEKTRONIK, 760308101208
4 1 RT1 RES., 100k, 1%, 0201, NTC THERMISTOR TDK, NTCG064EF104FTBX
5 1 U1 IC, 100mA WIRELESS LI-ION CHARGER WITH LOW BATTERY DISCONNECT, LQFN-12
ANALOG DEVICES, INC., LTC4124EV#PBF
Additional Circuit Components
1 1 D1 LED, RED, WATER-CLEAR, 0603 LITE-ON, LTST-C193KRKT-5A
2 1 R2 RES., 0Ω, 5%, 1/16W, 0402 ROHM, MCR01MZPJ000
Hardware: For Demo Board Only
1 10 E1-E10 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2308-2-00-80-00-00-07-0
2 8 JP1-JP8 CONN., HDR, MALE, 1×3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121
3 8 XJP1-XJP8 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
8
DEMO MANUAL DC2769A-B-KIT
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM4 4
3 3
2 2
1 1
44
33
22
11
1MHz
0.5A
REVI
SION
HIS
TORY
ECO
REV
DESC
RIPT
ION
APPR
OVED
DATE
-2
PROD
UCTI
ONW
L01
-23-
19
VIN GN
D
USB
2.0
VERS
ION
TABL
E
-BSKU#
*
-A
PCA
ADDI
TION
AL P
ARTS
4.5
- 5.5
V
UNLE
SS N
OTED
:RE
SIST
ORS:
OHM
S, 04
02, 1
%, 1
/16W
CAPA
CITO
RS:
uF, 0
402,
10%
, 50V
* SEE
TAB
LE
CTx1
CTx2
1800
pFLT
x17.5
uHR1 49.9k
243k
*
**
*
CHAR
GE C
URRE
NT10
mA
25m
A0.0
47uF
0.01u
FOP
T
*
C3 10uF
6.8uH
OPT
LTC6
990-
DCB
OPT
DATE
:
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CTx1
1206
C3 1206
U1
OE
4
GND
5
SET
3
DIV
2
V+1
OUT
6
GND
7
D1 RED
STNC
L1TO
OL, S
TENC
IL, 7
00-D
C277
1ARE
V02
R3 1
C1 4.7uF
10V
CTx2
0603
M1 BSS8
16NW
H632
7XTS
A11
3 2
LB1
LABE
L
LTx1
R2 2.2k
E1
R1
PCB1
PCB,
DC2
771A
REV0
2
C2 10uF
6.3V
J1VBUS
1
D-
2D+
3ID
4
GND
5
GND 8GND 9GND10
GND11
E2
9
DEMO MANUAL DC2769A-B-KIT
Rev. 0
SCHEMATIC DIAGRAM
VCC
ACIN
GND
GND
DCIN
BAT
REVI
SION
HIS
TORY
ECO
REV
DESC
RIPT
ION
APPR
OVED
DATE
-2
PROD
UCTI
ON
PCA
ADDI
TION
AL P
ARTS
UNLE
SS N
OTED
:RE
SIST
ORS:
OHM
S, 04
02, 1
%, 1
/16W
CAPA
CITO
RS:
uF, 0
201,
10%
, 50V
OPT
6V M
AX
NTC
-BSKU#
*
-A13
uF
LRx1
7.2uH
CRx1
0.047
uF10
mA
25m
A
CHAR
GE C
URRE
NT
CHRG
GND
GND
VERS
ION
TABL
E
SEE
TABL
E*
HI LO
HIHI
LOLO
CHRG
EN DIS
EN DIS
3.2V 2.7V
LBSE
LIS
EL2
VSEL
1
DIS ENNTC
VSEL
1VS
EL2
CHAR
GE V
OLTA
GE
HIHI
HILO
LO
LOLO
HI
4.35V
4.20V
4.10V
4.00V
PREC
HG
0201
VSEL
2
0402
-C -D50
mA
100m
A12
.6uF
12.6u
F0.0
47uF
WIR
ELES
S Li
-ION
CHAR
GER,
10m
A / 2
5mA
/ 50m
A / 1
00m
A,W
ITH
LOW
BAT
TERY
DIS
CONN
ECT
HI LO
ISEL
1 HIHI
**
**
DCIN
CRx2
CHEC
K VE
RSIO
N TA
BLE
*
3300
pFOP
TOP
TOP
T
*08
05X7
RC0
G
OPT
C3 OPT
2.2uF
10uF
WL
*
0.047
uF
ISEL
2
HILOLO
LOHILOIS
EL1
47uF
06-1
1-19
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
DATE
:
IC N
O.
SHEE
TOF
TITL
E: D
EMO
CIRC
UIT
SCHE
MAT
IC,
APPR
OVAL
SPC
B DE
S.
APP
ENG.
CUST
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ANAL
OG D
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ES H
AS M
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T TO
DES
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T TH
AT M
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R-SU
PPLI
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PECI
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S;HO
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REM
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THE
CUS
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R'S
RESP
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TY T
OVE
RIFY
PRO
PER
AND
RELI
ABLE
OPE
RATI
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THE
ACT
UAL
APPL
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COM
PONE
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PRIN
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BOAR
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Fax:
(408
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-050
7ww
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alog.c
om
Phon
e: (4
08)4
32-1
900
ANAL
OG16
30 M
cCar
thy
Blvd
.
AHEA
D OF
WHA
T'S P
OSSI
BLE
11
NC
LTC4124
700-
DC27
75A_
REV0
2710-DC2775A_REV02
705-
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75A_
REV0
2N/
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WL
DATE
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TACT
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(408
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-050
7ww
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alog.c
om
Phon
e: (4
08)4
32-1
900
ANAL
OG16
30 M
cCar
thy
Blvd
.
AHEA
D OF
WHA
T'S P
OSSI
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11
NC
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DC27
75A_
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2710-DC2775A_REV02
705-
DC27
75A_
REV0
2N/
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-11-
19
WL
LB1
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8
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4
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1
6
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2
7
E2
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JP4
JP6
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100k
D1 RED
JP1
10
DEMO MANUAL DC2769A-B-KIT
Rev. 0
ANALOG DEVICES, INC. 2019
10/19www.analog.com
ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.