1

DEMO MANUAL DC2770A-B-KIT

Rev. 0

DESCRIPTION

LTC4124/LTC4125, 100mA Wireless Li-Ion Charger Demonstration Kit

DC2770A-B-KIT is a kit of the DC2773A-B transmitter board (featuring LTC®4125) and the DC2775A-D (featuring LTC®4124). The DC2775A-D receiver board can charge a single Li-Ion battery at up to 100 mA with an air gap of 3.0 mm to 5.0 mm between the transmit and receive coils.

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

CONTENTS

BOARD PHOTO

The DC2773A-B transmitter supports Optimum Power Search and Foreign Object Detection features via LTC4125.

Design files for this circuit board are available.

Figure 1. DC2773A-B Picture Figure 2. DC2775A-D Picture

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN DC2773A-B Voltage Input IVIN ≤ 500mA 4.5 5.5 V

IIN DC2773A-B VIN Current VIN = 5V 500 mA

VBAT DC2775A-D 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-D Charge Current VBAT = 4.0V, ISEL1 = VCC, ISEL2 = VCC 100 mA

AIR-GAP Separation Between LTX and LRX Coils 3 3.5 5 mm

fTX_TANK DC2773A-B Resonant Tank Frequency 200 kHz

fRX_TANK DC2775A-D Resonant Tank Frequency 200 kHz

1 × DC2773A-B (LTC4125) Transmitter Demo Board

1 × DC2775A-D (LTC4124) Receiver Demo Board

2

DEMO MANUAL DC2770A-B-KIT

Rev. 0

QUICK START PROCEDURERefer to Figures 3, 4, and 5 for the proper measurement equipment setup, DC2775A-D mounting on DC2773A-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 signal and GND terminals. See Figure 6 for proper scope probe technique.

1. Place the DC2775A-D board atop the DC2773A-B board by aligning the mounting holes and screws on both boards. Make sure the air-gap between two coils is at about 3.5mm.

2. The default battery charge voltage is 4.2V and the charging current is 100mA. Battery charge voltage, charge current, pre-charge feature and low battery disconnect voltage can be programmed by jumpers on the DC2775A-D board.

3. Connect a voltage source PS1 and a 20 Ohm resis-tor RBAT1 between the BAT and GND turrets of DC2775A-D, 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 battery charging current, the power supply

only sources current even when the battery charge cur-rent is at its maximum value.

4. Connect an ammeter AM1 between PS1 and the DC2775A-D BAT turret. Connect a voltage meter VM1 between DC2775A-D BAT and GND turrets.

5. Connect a power supply (PS2) between DC2773A-B VIN turret and GND turret. DC2773A-B can also be pow-ered through Micro-USB cable to a 5V power source.

6. Set PS1 = 3.7V, PS2 = 5V and enable both power sup-plies simultaneously. The DC2773A-B should start sweeping the LTX current looking for a receiver. When a valid receiver is found, the LED sweeping will freeze until the next search period. This is also indicated by the DC2773A-B status green led being turned on. The input current monitor LED string will show the input current percentage with respect to 500mA current limit.

7. The DC2775A-D.D1 should be turned on, indicating power is delivered to the load. Observe AM1. AM1 should be reading 100mA of charge current into the battery emulator when the battery charger is in con-stant current mode. Compare VM1 voltage with battery charge voltage setting to make sure the battery charger is in constant current mode.

8. When test is done, turn off PS1 and PS2 simultaneously.

Figure 3. DC2770A-B-KIT in Operation

3

DEMO MANUAL DC2770A-B-KIT

Rev. 0

TEST SETUP

Figure 4. DC2775A-D Top

Figure 5. DC2773A-B Top

+ –

+

–

AM1

Battery Emulator

VM1RBAT120�

PS13.7V DC

0.5A

PS24.5–5.5V Supply

0.5A

+

–

4

DEMO MANUAL DC2770A-B-KIT

Rev. 0

TEST SETUP

Figure 6. 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.

5

DEMO MANUAL DC2770A-B-KIT

Rev. 0

THEORY OF OPERATIONThe DC2770A-B-KIT demonstrates operation of a mag-netically coupled resonant Wireless Power Transfer (WPT) system. The LTC4125 transmitter provides efficient wire-less power for the LTC4124 receiver to charge the Li-Ion battery.

DC2773A-B – Wireless Power Transmitter Board featuring the LTC4125

The LTC4125 implements an AutoResonant drive of the series resonant transmit tank composed of the transmit coil LTX, and the transmit capacitor CTX. The AutoReso-nant driver uses a zero-crossing detector to determine the resonant frequency of the tank. All sub-sequent duty cycles discussed here use the resonant period determined by the AutoResonant circuitry.

The SW1 and SW2 pins each have a half bridge driver. At zero current crossing, whichever SWX pin has positive going current, is set to VIN for a duty cycle determined by the corresponding PTHX pin. When the SWX pin is set to VIN, it increases the current flowing in the transmitter resonant tank. The absolute value of the tank current is determined by the resonant tank components and also by the reflected load impedance.

VIN

IL VL

Figure 7. AutoResonant LC Tank Voltage and Current Waveforms with Square Wave Input at less than 50% Duty Cycle

The LTC4125 sweeps the duty cycle by way of a 5 bit DAC that sets the PTHX voltage, and hence the duty cycle. The duration of each step of this DAC is programmable via CTS pin, which is set at 18ms in this demo.

The FB pin is driven by the node forming the junction of the transmit coil LTX, and the transmit capacitor CTX. The voltage at this node is proportional to the circulating current in the transmitter resonant tank.

The LTC4125 monitors the FB pin, and when a valid exit condition is found, it stops incrementing the PTHX volt-age. The PTHX voltage is held at the detection level for the rest of the sweep cycle This sweep cycle timer is program-mable by CTD pin, which is approximately 5 seconds in this demo.

If the receiver is removed from the transmitter, resonant tank current will rise significantly. The FB pin captures the rise of resonant current and terminates both half bridge drivers. As a result, the transmit power is reduced to standby mode.

If metal foreign objects are inserted between the trans-mit coil and the receive coil, the resonant frequency will increase significantly. The LTC4125 captures the rise of resonant frequency and reduces the transmit power to standby mode.

In standby mode, the LTC4125 will look for a valid receiver every 5s. If a valid receiver is found, the power transfer is resumed.

The LTC4125 uses an NTC resistor to monitor the tem-perature of the LTX and shut off the transmit power if the NTC reports a temperature higher than approximately 42°C. Please see the applications section of the data sheet for more detailed information.

DC2775A-D – Wireless Power Receiver Board featuring the LTC4124

The DC2775A-D demo board implements a parallel res-onant 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 manager circuit 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 8, 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 ( at VCC Pin) 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.

6

DEMO MANUAL DC2770A-B-KIT

Rev. 0

THEORY OF OPERATION

VCC2V/DIV

VACIN2V/DIV

VBAT2V/DIV

Figure 8. Rectification of AC Input and Regulation of VCC

As shown in Figure 9, when paired with DC2773A-B, the LTC4124 shunting event triggers an exit condition for LTC4125 to stop its search algorithm. In this way, DC2773A-B always finds a transmit power level that is just enough for LTC4124 to charge the battery. This feature allows the receiver to be placed at various axial distance and misalignment while maintaining the same charge cur-rent. It also increases the efficiency at light load condition when the LTC4124 demands less power at the end of the charge cycle.

50ms/DIV

VPTH_LTC4125500mV/DIV

VFB_LTC41251V/DIV

IBAT_LTC412450mA/DIV

Figure 9. LTC4124 Shunting Event Triggering Exit Condition for LTC4125 to Stop the Search Algorithm

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-D is 100mA and the charge voltage is programmable by VSELX jumpers.

7

DEMO MANUAL DC2770A-B-KIT

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2773A-B: Required Circuit Components

1 3 C1, C2, C3 CAP., 100uF, X5R, 6.3V, 10%, 1206 MURATA, GRM31CR60J107KE39L

2 1 C4 CAP., 0.01uF, X7R, 50V, 10%, 0402 KEMET, C0402C103K5RAC7867

3 1 C5 CAP., 0.68uF, X5R, 10V, 10%, 0402 YAGEO, CC0402KRX5R6BB684

4 1 C6 CAP., 4700pF, X7R, 50V, 10%, 0402 AVX, 04025C472KAT2A

5 1 C7 CAP., 680pF, C0G, 25V, 5%, 0402 KEMET, C0402C681J3GACTU

6 1 C8 CAP., 0.1uF, X7R, 50V, 10%, 0402 AVX, 04025C104KAT2A

7 1 C9 CAP., 0.1uF, X7R, 100V, 10%, 0603 AVX, 06031C104KAT2A

8 1 C10 CAP., 1uF, X5R, 16V, 10%, 0402 AVX, 0402YD105KAT2A

9 2 C11, C12 CAP., 47uF, X5R, 6.3V, 20%, 0805 SAMSUNG, CL21A476MQYNNNE

10 1 CRx1 CAP., 0.068uF, C0G, 50V, 5%, 1206, AEC-Q200 MURATA, GCM31C5C1H683JA16L

11 1 CRx2 CAP., 0.022uF, C0G, 50V, 5%, 1206, AEC-Q200 TDK, CGA5C2C0G1H223J060AA

12 1 D3 DIODE, SCHOTTKY, 70V, 70mA, 0402/SOD-923F COMCHIP, CDBQR70

13 1 D4 DIODE, SWITCHING, 300V, 250mA, SOD-523 DIODES INC., BAS521-7

14 1 D5 LED, GREEN, WATER CLEAR, 0603 LITE-ON, LTST-C190KGKT

15 1 LTx1 IND., 6.8uH, WIRELESS CHRG. COIL, TX., 10%, 2.5A, 125mOHMS, 20.5mm Dia x 2.6mm H, 1 COIL, 1 LAYER

WURTH ELEKTRONIK, 760308101104

16 1 NTC1 RES., 10k OHMS, 1%, NTC THERMISTOR MURATA, FTN55XH103FD4B

17 1 Q1 XSTR., NPN, 40V, 0.2A, SOT883, AEC-Q101 NEXPERIA, PMBT3904M, 315

18 2 R1, R17 RES., 2.2k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022K20JNED

19 1 R2 RES., 0.047 OHMS, 1%, 1W, 0612, CURRENT SENSE SUSUMU, PRL1632-R047-F-T1

20 1 R3 RES., 1.33k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW04021K33FKED

21 2 R4, R5 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

22 1 R6 RES., 3.24k OHMS, 1%, 1/10W, 0402 PANASONIC, ERJ2RKF3241X

23 1 R8 RES., 16.5K OHMS, 1%, 1/16W, 0402, THICK FILM, AEC-Q200

VISHAY, CRCW040216K5FKED

24 2 R10, R14 RES., 100k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1003X

25 1 R12 RES., 102k OHMS, 1%, 1/16W, 0402, AEC-Q200 STACKPOLE ELECTRONICS, INC., RMCF0402FT102K

26 1 R14 RES., 37.4k OHMS, 1%, 1/16W, 0402, AEC-Q200 STACKPOLE ELECTRONICS, INC., RMCF0402FT37K4

27 1 R15 RES., 20k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF2002X

28 1 R16 RES., 100k OHMS, 1%, 1/10W, 0603, 350V, AEC-Q200 ROHM, KTR03EZPF1003

29 1 R18 RES., 10k OHMS, 5%, 1/16W, 0402 YAGEO, RC0402JR-0710KL

30 1 R43 RES., 1 OHM, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ1R0V

31 1 U1 IC, 5W Wireless Power Transmitter, QFN-20 (4x5), AutoResonant

ANALOG DEVICES, LTC4125EUFD#PBF

Additional Circuit Components

1 3 C13, C15, C16 CAP., 0.01uF, X7R, 50V, 10%, 0402 KEMET, C0402C103K5RAC7867

2 2 C14, C17 CAP., 1uF, X5R, 16V, 10%, 0402 AVX, 0402YD105KAT2A

3 1 D1 LED, RED, WATER-CLEAR, 0603 LITE-ON, LTST-C193KRKT-5A

4 7 D6-D12 LED, BLUE, WATER CLEAR, 0603 LUMEX, SML-LXFP0603USBCTR

5 1 R41 RES., 2.2k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022K20JNED

6 3 R8, R44, R46 RES., 0 OHM, 1/16W, 0402 NIC, NRC04ZOTRF

8

DEMO MANUAL DC2770A-B-KIT

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

7 1 R19 RES., 10k OHMS, 5%, 1/16W, 0402 YAGEO, RC0402JR-0710KL

8 2 R20, R33 RES., 430 OHMS, 5%, 1/16W, 0402 YAGEO, RC0402JR-07430RL

9 1 R21 RES., 15.4k OHMS, 1%, 1/16W, 0402, AEC-Q200 KOA SPEER, RK73H1ETTP1542F

10 1 R22 RES., 27.4k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040227K4FKED

11 1 R23 RES., 511k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402511KFKED

12 7 R24-R30 RES., 75k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040275K0FKED

13 1 R31 RES., 11.3k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040211K3FKED

14 1 R32 RES., 787k OHMS, 1%, 1/16W, 0402 NIC, NRC04F7873TRF

15 7 R34-R40 RES., 6.2k OHMS, 1%, 1/16W, 0402 YAGEO, RC0402FR-076K2L

16 1 R45 RES., 0 OHM, 1/16W, 0402 ROHM, MCR01MZPJ000

17 2 U2, U3 IC, QUAD COMPARATOR LP 1.221VREF, DFN-16 (5x4) ANALOG DEVICES, LTC1445CDHD#PBF

Hardware: For Demo Board Only

1 3 E1, E4, E5 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THICK

MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 E2, E3 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE, 0.218"

KEYSTONE, 575-4

3 1 J1 CONN., MICRO USB-B, RCPT., FEMALE, 5-PIN, HORZ. R/A SMT

WURTH ELEKTRONIK, 629105136821

4 2 JP1, JP2 CONN., HDR., MALE, 1x3, 2mm, THT, STR, NO SUBS. ALLOWED

SAMTEC, TMM-103-02-L-S

5 6 MP1, MP2, MP5-MP7, MP10

STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000

6 1 NTC ASSEMBLY_1 CONN., JSC COAXIAL SOCKET, RCPT., FEMALE, SMD, 1PORT, I/O TERM.

MURATA, MM5831-2700RB

7 2 XJP1, XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm Wurth Elektronik, 60800213421

DC2775A-D: Required Circuit Components

1 1 C3 CAP., 47uF, X5R, 6.3V, 20%, 0603 MURATA, GRM188R60J476ME15D

2 1 CRx2 CAP., 0.047uF, C0G, 25V, 5%, 0805 KEMET, C0805C473J3GACAUTO

4 1 LRx1 IND., 12.6uH, WIRELESS CHRG. COIL RX Qi, 10%, 1.1A, 340mOHMS, 17mm Dia x 0.8mm H, 1 COIL, 1 LAYER

WURTH ELEKTRONIK, 760308101220

5 1 R2 RES., 0 OHM, 5%, 1/16W, 0402 ROHM, MCR01MZPJ000

6 1 RT1 RES., 100k OHMS, 1%, 0201, NTC THERMISTOR TDK, NTCG064EF104FTBX

Additional Circuit Components

1 1 D1 LED, RED, WATER CLEAR, 0201 KINGBRIGHT, APG0603SEC-E-TT

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, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121

3 8 XJP1-XJP8 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

9

DEMO MANUAL DC2770A-B-KIT

Rev. 0

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C10

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R16

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D+3

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GND 8GND 9GND7

GND6

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1

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R7 OPT

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10

DEMO MANUAL DC2770A-B-KIT

Rev. 0

SCHEMATIC DIAGRAM4 4

3 3

2 2

1 1

44

33

22

11

INPU

T CU

RREN

T

1.221

V

DIS

MON

ITOR

U3.3

U2.3

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EN

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TORE

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TRAN

SMIT

TER

*SEE

TAB

LE

150%

100% 85

%

71%

57%

43%

29%

14%

IMON

VIN

DATE

:

IC N

O.

SHEE

TOF

TITL

E: D

EMO

CIRC

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MAT

IC,

APPR

OVAL

SPC

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V01

11

DEMO MANUAL DC2770A-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 DIAGRAM

VCC

ACIN

GND

GND

DCIN

BAT

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SION

HIS

TORY

ECO

REV

DESC

RIPT

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APPR

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DEMO MANUAL DC2770A-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.