DEMO MANUAL LTC6990/LTC4124 10mA Wireless Li-Ion Charger ... · 3 1 RT1 RES., 100k, 1%, 0201, NTC...

1

DEMO MANUAL DC2769A-A-KIT

Rev. 0

DESCRIPTION

LTC6990/LTC4124 10mA Wireless Li-Ion Charger

10mA Demonstration Kit DC2769A-A-KIT is a kit of the DC2771A-A transmitter board, featuring LTC®6990, the DC2775A-A, featuring LTC4124, and the DC2774A application-sized receiver board featuring LTC4124. The DC2775A-A receiver can

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

PERFORMANCE SUMMARY

KIT CONTENTS

BOARD PHOTO

charge a single Li-Ion battery at up to 10mA with an air gap of 0.5mm between the transmit and receive coils.

Design files for this circuit board kit are available.

Specifications are at TA = 25°C

Figure 1. DC2771A-A Picture Figure 2. DC2775A-A Picture Figure 3. DC2774A Picture

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITSVIN DC2771A-A Voltage Input IVIN ≤ 100mA 4.5 5.5 VIIN DC2771A-A VIN Current VIN = 5V 100 mAVBAT DC2775A Battery Charge Voltage VSEL1 = VCC, VSEL2 = GND 4.2 VVBAT DC2775A-A Battery Charge Voltage VSEL1 = HI, VSEL2 = HI 4.35 V

VSEL1 = HI, VSEL2 = LO 4.2 VVSEL1 = LO, VSEL2 = HI 4.1 VVSEL1 = LO, VSEL2 = LO 4.0 V

IBAT DC2775A-A Charge Current VBAT = 4.0V, ISEL1 = ISEL2 = GND 10 mAAir-Gap Separation Between LTX and LRX 0 0.5 0.75 mmfDRIVE DC2771A-A Drive Frequency 1 MHzfTX_TANK DC2771A-A Resonant Tank Frequency 1.4 MHzfRX_TANK DC2775A-A Resonant Tank Frequency 1 MHz

1 × DC2771A-A (LTC6990) Transmitter Demo Board1 × DC2775A-A (LTC4124) Receiver Demo Board2 × DC2774A (LTC4124) Application-Sized Receiver Demo Board

https://www.analog.com/DC2769A-A-KIT?doc=DC2769A-A-KIT.pdfhttps://www.analog.com/DC2769A-A-KIT?doc=DC2769A-A-KIT.pdfhttps://www.analog.comhttps://www.analog.comhttps://www.analog.com/LTC6990?doc=DC2769A-A-KIT.pdfhttps://www.analog.com/LTC4124?doc=DC2769A-A-KIT.pdfhttps://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/DC2769A-A-KIT.html#eb-documentation?doc=DC2769A-A-KIT.pdf

2


Rev. 0

QUICK START PROCEDURERefer to Figure 5 to 8 for the proper measurement equip-ment setup, DC2775A-A mounting on DC2771A-A, 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 9 for proper scope probe technique.

1. Plug a Micro-USB cable into DC2771A-A.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 6).

2. The default battery charge voltage is 4.2V and the charging current is 10mA. Battery charge voltage, charge current, pre-charge feature and low battery disconnect voltage can be programmed by jumpers on the DC2775A-A board.

3. Connect a voltage source PS1 and a 200Ω resistor RBAT1 between the BAT and GND turrets of DC2775A-A, respectively (Figure 5). 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-A BAT turret. Connect a voltmeter VM1 between DC2775A-A 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-A.D1 LED should be turned on. DC2775A.D1 LED should start blinking intermittently. AM1 should be reading 10mA. If the AM1 meter reads much less than 10mA, read VM1 and check whether LTC4124 is in constant current mode (Figure 4).

7. Turn off PS1 and PS2 simultaneously. Remove DC2775A-A from DC2771A-A. Place two DC2774A boards on top DC2771A-A coil (Figure 8).

8. Turn on PS2. DC2774A.D1 LED should start blinking intermittently.

9. Turn of PS2 and remove DC2774A from DC2771A-A.

Figure 4. 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

DC2769AA F04

1109070 10060

BATT

ERY

CHAR

GE C

URRE

NT(%

OF

PROG

RAM

MED

CHA

RGE

CURR

ENT)

https://www.analog.com/DC2769A-A-KIT?doc=DC2769A-A-KIT.pdf

3


Rev. 0

QUICK START PROCEDURE

Figure 5. DC2775A-A Top

+ –

+

–

AMI

BATTERY EMULATOR

VMIRBAT1200Ω

PS13.7V DC

0.5A

Figure 6. DC2771A-A Top

Figure 7. DC2775A-A on top of DC2771A-A

PS25.0V DC

0.1A

CONNECT TO A 5V POWER SUPPLY TO VIN AND GND TURRENTS

OR

+

–

POWER DC2771A-A USING MICRO-USB

CABLE TO HOST OR A 5V ADAPTER.

https://www.analog.com/DC2769A-A-KIT?doc=DC2769A-A-KIT.pdfhttps://www.analog.com/DC2769A-A-KIT?doc=DC2769A-A-KIT.pdf

4


Rev. 0

HARDWARE SETUP

Figure 8. DC 2774A on top of DC2771A-A in Operation

Figure 9. 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


Rev. 0

OPERATIONThe DC2769A-A-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-A – Wireless Power Transmitter Board Featuring the LTC6990

The DC2771A-A is a wireless power transmitter board using LTC6990 oscillator. The NMOS, M1(see DC2771A-A schematic on Page 7), 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 10 illustrates the ZVS operation in DC2771A-A. 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

DC2769AA F10

Figure 10. ZVS Operation on M1 when fTX_TANK = 1.29 • fDRIVE

DC2775A-A – Wireless Power Receiver Board Featuring the LTC4124

The DC2775A-A 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 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 11, 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-A is 10mA and the charge voltage is programmable by VSELX jumpers.

VCC2V/DIV

VACIN2V/DIV

VBAT2V/DIV

DC2769AA F11

Figure 11. Rectification of AC Input and Regulation of VCC


6


Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2771A-A: 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 CTx2 CAP., 1800pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H182JA01D

4 1 LTx1 IND., 7.5μH, WIRELESS CHRG. COIL RX. Qi, 10%, 1.55A, 380mΩ, 2815, 1 COIL, 1 LAYER

WURTH ELEKTRONIK, 760308103206

5 1 M1 XSTR., MOSFET, N-CH, 20V, 1.4A, SOT-323, AEC-Q200 INFINEON, BSS816NWH6327XTSA1

6 1 R1 RES., 49.9k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F4992TRF

7 1 R2 RES., 2.2k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022K20JNED

8 1 R3 RES., 1Ω, 1%, 1/16W, 0402, ±100ppm, AEC-Q200 VISHAY, CRCW04021R00FKED

9 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


1 1 CRx1 CAP., 3300pF, X7R, 50V, 10%, 0402 AVX, 04025C332KAT2A

2 1 LRx1 IND., 7.2μH, WIRELESS CHRG. COIL RX., ±10%, 500mA, 440mΩ, 6mm × 2mm, 1 COIL, 1 LAYER


3 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, 0201 KINGBRIGHT, APG0603SEC-E-TT

2 1 Z1 DIODE, ZENER, 3.3V, 100mW, 0201 COMCHIP, CZRZ3V3B-HF


1 1 CRx1 CAP., 3300pF, X7R, 50V, 10%, 0402 AVX, 04025C332KAT2A

2 1 LRx1 IND., 7.2μH, WIRELESS CHRG. COIL RX., ±10%, 500mA, 440mΩ, 6mm × 2mm, 1 COIL, 1 LAYER


3 1 RT1 RES., 100k, 1%, 0201, NTC THERMISTOR TDK, NTCG064EF104FTBX

4 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


7


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.

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8


Rev. 0

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9


Rev. 0

SCHEMATIC DIAGRAM

VCC

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GND

GND

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10


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.

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DescriptionContentsPerformance SummaryBoard PhotoQuick Start ProcedureHardware SetupOperationParts ListSchematic Diagram

DEMO MANUAL LTC6990/LTC4124 10mA Wireless Li-Ion Charger ... · 3 1 RT1 RES., 100k, 1%, 0201, NTC...

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Transcript of DEMO MANUAL LTC6990/LTC4124 10mA Wireless Li-Ion Charger ... · 3 1 RT1 RES., 100k, 1%, 0201, NTC...