Linear ADI Power DC3080A-KIT Guida rapida alla configurazione

DEMO MANUAL DC3080A-KIT

Rev. 0

DESCRIPTION

LTC4126-ADJ

10mA Wireless Charger

Demonstration Kit

Demonstration Kit DC3080-KIT features LTC

4126-

ADJ, wireless Li-Ion Charger with 1.2V Step-Down DC/

DC Converter. This kit comprises a wireless transmitter

DC3081A, a wireless receiver DC3078A and two 6mm

application-sized receivers DC3079A.

DC3078A wireless charger receiver incorporates an exter-

nal trickle charge circuit that reduces the charge current to

1 x DC3078A (LTC4126-ADJ) Receiver Demo Board

2 x DC3079A (LTC4126-ADJ) 6mm Application-Sized Receiver Demo Board

1 x DC3081A (LTC6990) Transmitter Demo Board

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

PERFORMANCE SUMMARY

BOARD PHOTO

TYPICAL APPLICATION SCHEMATIC

1mA when a deeply discharged battery with voltage lower

than 2.8V is plugged in. The combination of DC3081A

transmitter and DC3078A receiver can charge a single

Li-Ion battery at up to10mA with an airgap of 4.0mm to

8.0mm.

Design files for this circuit board are available.

Specifications are at TA= 25°C

Figure1. 10mA Wireless Charging System Using DC3078A and DC3081A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN DC3081A Voltage Input 4.5 5.5 V

IBAT DC3078A Charge Current in CC Mode 10 mA

VBAT DC3078A Float Voltage 4.2 V

fDRIVE DC3081A Drive Frequency 205 kHz

fTX_TANK DC3081A Resonant Tank Frequency 255 kHz

fRX_TANK DC3078A Resonant Tank Frequency 203 kHz

AIR-GAP Airgap Between DC3078A and DC3081A IBAT = 10mA 4 8 mm

243k

4.7µF

57nF

LT X

6.8µF

13µF

47nF

NTC

BIAS

100k

LED

30.1k

2.2µF

6.34k

1µF

8.87k

4.5V TO 5.5V

200mA

LTC6990

SET

DIV

V+

GND

OUT

AIR-GAP

4mm TO 8mm

DC3078A

ACIN

STAT1

STAT2

ACPR

Li-Ion

Battery

BAT

NTC

DC3081A

10mA

PBEN

LTC4126-ADJ

GND

DIGITAL

I/O

PUSHBUTTON

CHRG

OUT

DIS

GND

OUT

1.2V

40mA

PROG

TRICKLE CHARGE WHEN

BAT

IS BELOW 2.8V

ADM8642T100

DEMO MANUAL DC3080A-KIT

Rev. 0

BOARD PHOTO

Figure2. DC3078A Front Figure3. DC3078A Back

Figure4. DC3079A Front Figure5. DC3079A Back

Figure6. DC3081A Front Figure7. DC3081A Back

DEMO MANUAL DC3080A-KIT

Rev. 0

QUICK START PROCEDURE

Refer to Figure9 and Figure11 for the proper measure-

ment equipment setup and follow the procedure below:

1. Connect a voltage source PS1 and a 50Ω resistor RBAT1

between the BAT and GND turrets of the DC3078A as

shown in Figure9. PS1 and RBAT1 make up the battery

emulator. Typical power supply cannot sink current. By

adding a resistor across the power supply inputs that

draws more current than the maximum battery charge

current, the power supply only sources current at all

time. Connect a voltmeter VM1 to measure the BAT pin

to GND voltage. Connect an ammeter AM1 to measure

the charge current to the battery emulator.

2. Connect a voltage source PS2 between the VIN and

GND turrets of the DC3081A, as shown in Figure10.

3. Set PS1 to 2.5V, and power up PS1. Set PS2 to 5V, and

power up PS2. The LED indicator on DC3078A receiver

board should start blinking slowly, indicating power is

delivered to the receiver. AM1 should read around 1mA

trickle charge current.

4. Slowly increase PS1 until VM1 reads 3.6V. The charge

current should jump up to 10mA. Further increase PS1

voltage slowly, until VM1 reads 4.2V. The charge cur-

rent should drop to zero.

5. Connect an electronic load LD1 and a voltmeter between

OUT and GND pin. If EN jumper is at ON position, VM2

should read 1.2V. If not, OUT can be turned on/off by

the pushbutton.

6. When OUT is on, set LD1 to CC mode. Slowly tune up

the load current to 40mA. VM2 should be regulated at

around 1.2V

7. Turn off LD1, PS2 and PS1.

8. To test DC3079A, 6mm application-sized demo, please

remove the DC3078A away from DC3081A. Place

DC3079A on top of the DC3081A transmitter coil LTx1.

9. Turn on PS1. The LED on DC3079A should start blink-

ing slowly, indicating power is delivered to the receiver.

BATT

CHRG

TIME (MINS)

120

160

200

240

280

320

360

400

3.3

3.4

3.5

3.6

3.7

3.8

3.9

4.0

4.1

4.2

4.3

CHARGE CURRENT (mA)

BATTERY VOTLAGE (V)

Figure8. DC3078A and DC3081A Wireless Charging Profile with

19mAh Li-Ion Battery

DEMO MANUAL DC3080A-KIT

Rev. 0

TEST SETUP

Figure9. Test Setup for DC3078A Receiver

Figure10. Test Setup for DC3081 Transmitter

PS2

.5V-5.5V

AM1

RBAT1

Ω

PS1

.5V-4.2V

VM1

BATTERY

EMULATOR

LD1

-40mA

VM2

DEMO MANUAL DC3080A-KIT

Rev. 0

TEST SETUP

Figure11. Test Setup for DC3079A 6mm Application-Sized Receiver

Figure12. DC3078A and DC3081A Combination

DEMO MANUAL DC3080A-KIT

Rev. 0

THEORY OF OPERATION

The DC3080A-KIT demonstrates the operation of

LTC4126-ADJ, wireless battery charger. This kit is com-

posed of a DC3081A transmitter board, a DC3078A

receiver board and two DC3079A 6mm application-sized

receiver boards.

DC3078A Wireless Charger Receiver Board

DC3078A features the LTC4126-ADJ, a wireless Li-Ion

charger with 1.2V step-down DC/DC converter. The charge

current in CC mode is 10mA. This charge current is pro-

grammed by the resistor on PROG pin of LTC4126-ADJ.

To efficiently receive energy from the transmitter, the

resonant frequency of this receiver board is set up to be

203kHz, matching the drive frequency of the transmitter

board. The LTC4126-ADJ rectifies the resonant AC volt-

age to generate VCC. When enough energy is received

by the LTC4126-ADJ, V

is kept between 5-5.5V by a

wireless power manager. As VCC voltage reaches 5.5V,

the resonant tank will be shunted to GND. In this way,

receiver stops receiving energy and V

starts to drop

until it reaches 5V. The resonant tank also receives less

power when the shunting circuit is engaged, as the reso-

nant frequency is detuned from the transmitter frequency.

2V/DIV

ACIN

2V/DIV

BAT

2V/DIV

Figure13. Rectification of AC Input and Regulation of DC Rail

Voltage

The transmitter board also includes an external circuit

to achieve the trickle charge function. When a low volt-

age (<2.8V) battery is connected, the charge current is

reduced to 1mA until BAT pin voltage rises over 2.8V.

When BAT pin is lower than 2.8V before charging, the

comparator on board will inject current to the PROG pin

resistor once VCC is available. The effective current com-

ing out from PROG pin is reduced. As PROG pin output

current is proportional to charge current, the charge cur-

rent is reduced. When the battery voltage is charged up

to above 2.8V, the comparator stops injecting current and

the charge current increases to the original programmed

level.

DC3081A Wireless Charger Transmitter Board

The DC3081A is a wireless power transmitter board,

using LTC6990 TimerBlox. The NMOS M1 is driven by

a 50% duty cycle square wave generated by the oscilla-

tor. During the first half of the cycle, M1 is switched on

and the current through the resonant tank rises linearly.

During the second half of the cycle, M1 is switched off and

the current circulates through the resonant tank. When

the transmit resonant tank frequency is set to about 1.29

times the driving frequency, M1 is turned on at zero volt-

age, and the switching loss is significantly reduced. The

peak voltage of the transmit resonant tank that appears

at the drain of M1 is :

VIN = 1.038 × π × VIN (1)

This equation is derived by performing voltage second

balance equation on the resonant tank inductor.

GS_M1

2V/DIV

DS_M1

5V/DIV

Figure14. ZVS Operation on M1

DEMO MANUAL DC3080A-KIT

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC3078A Evaluation Receiver: Required Circuit Components

1 1 C1 CAP., 2.2uF, X5R, 16V, 20%, 0402 TDK, C1005X5R1C225M050BC

2 1 C2 CAP., 1uF, X5R, 16V, 10%, 0402 AVX, 0402YD105KAT2A

3 1 C4 CAP CER 2.2UF 6.3V X5R 0201 MURATA, GRM033R60J225ME47D

4 1 CRx1 CAP., 0.047uF, C0G, 25V, 5%, 0805, AEC-Q200 KEMET, C0805C473J3GACAUTO

5 1 LRx1 IND., 13uH, WIRELESS CHRG. COIL RX. Qi, 10%,

0.8A, 500mOHMS, 10mm Dia x 1.68mm H,

WURTH ELEKTRONIK, 760308101208

6 1 R4 RES., 8.87k OHMS, 1%, 1/16W, 0402, AEC-Q200 ROHM, MCR01MZPF8871

7 1 R5 RES., 30.1k OHMS, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F3012TRF

8 1 R7 RES., 0 OHM, 1/16W, 0402 NIC, NRC04ZOTRF

9 1 R9 RES 1 KOHM, ERJ1G Series, 25V, 0201, 50 mW PANASONIC, ERJ-1GEJ102C

10 1 U1 IC, Li-ion Charger with Step-Down Reg. for Hearing

Aids with Adj. Current, LQFN-12

ANALOG DEVICES, INC., LTC4126EV-ADJ#PBF

DC3078A: Additional Circuit Components

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

2 1 R2 RES., 0 OHM, 5%, 1/16W, 0402 ROHM, MCR01MZPJ000

DC3078A: Hardware, For Demo Board Only

1 2 E1-E14 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2308-2-00-80-00-00-07-0

2 1 JP1, JP2 CONN., HDR, MALE, 1x3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121

2 1 XJP1, XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

DC3079A 6mm Receiver: Required Circuit Components

1 1 COUT1 CAP., 2.2uF, X5R, 16V, 20%, 0402 TDK, C1005X5R1C225M050BC

2 1 CRx1 CAP., 0.068uF, X7R, 25V, 10%, 0402, AEC-Q200 TDK, CGA2B3X7R1E683K050BB

3 1 LRx1 IND., 7.2uH, WIRELESS CHRG. COIL RX., +/-10%,

500mA, 440mOHMS, 6mmX2mm, 1 COIL, 1 LAYER

WURTH ELEKTRONIK, 760308101216

4 1 R1 RES., 8.87k OHMS, 1%, 1/20W, 0201, AEC-Q200 PANASONIC, ERJ1GNF8871C

4 1 RT1 RES., 100k OHMS, 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

DC3079A: Additional Circuit Components

1 1 D1 LED, RED, CLEAR, 0402, SMD ROHM, SML-P11UTT86

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

DEMO MANUAL DC3080A-KIT

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC3081A Transmitter: Required Circuit Components

1 1 C1 CAP., 4.7uF, X5R, 10V, 10%, 0402 TDK, C1005X5R1A475K050BC

2 1 C3 CAP., 0.1uF, X5R, 10V, 10%, 0402 AVX, 0402ZD104KAT2A

3 1 CTx1 CAP., 0.047uF, C0G, 50V, 5%, 1206 MURATA, GCM31M5C1H473JA16L

4 1 CTx2 CAP., 0.01uF, C0G, 25V, 5%, 0603 KEMET, C0603C103J3GACTU

5 1 LTx1 IND., 6.8uH, WIRELESS CHRG. COIL, 10%, 2.5A,

125mOHMS, 20.5mm Dia x 2.6mm H

WURTH ELEKTRONIK, 760308101104

6 1 R3 RES., 243k OHMS, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2433TRF

7 1 M1 XSTR., MOSFET, N-CH, 20V, 6A, SOT23-3 VISHAY, Si2312CDS-T1-GE3

8 1 U1 OSCILLATOR, TimerBlox: VCO, 5pF, 90ppm, DFN-5 ANALOG DEVICES, LTC6990CDCB#PBF

DC3081A: Additional Circuit Components

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

2 1 C4 CAP., 100uF, X5R, 6.3V, 20%, 1206 MURATA, GRM31CR60J107ME39L

3 1 R1 RES., 2.2k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022K20JNED

4 1 R2 RES., 1 OHM, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021R00FKED

DC3081A: Hardware, For Demo Board Only

1 2 E1, E2 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB

0.062"

MILL-MAX, LTST-C193KRKT-5A

1 1 J1 CONN., uUSB 2.0, RCPT., 5-PIN, 1PORT, REVERSE

MOUNT, R/A HORZ., TYPE B, FLANGELESS

TE CONNECTIVITY, 1932788-1

DEMO MANUAL DC3080A-KIT

Rev. 0

SCHEMATIC DIAGRAM

D D

C C

B B

A A

VCC

ACIN

CHRG

ACPR

STAT1

STAT2

PBEN

BAT

OUT

GND

1.2V

REVISION HISTORY

ECO REV DESCRIPTION APPROVED DATE

-02 PRODUCTION W. Li 07-29-2020

UNLESS NOTED:

RESISTORS: OHMS, 0402, 1%, 1/16W

CAPACITORS: uF, 0402, 10%, 50V

40mA

OFF

OPT

6V MAX

NTC

DIS

EXT NTC

CHRG

10mA WIRELESS LI-ION CHARGER WITH 1.2V STEP-DOWN DC/DC

CONVERTER AND TRICKLE CHARGE CONTROLLER

4.2V

10mA

GND

fr = 203.6kHz

PCA ADDITIONAL PARTS

LTC4126EV-ADJ

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

W. Li

LTC4126-ADJ

DEMO CIRTCUIT 3078A 02

07-29-2020

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

W. Li

LTC4126-ADJ

DEMO CIRTCUIT 3078A 02

07-29-2020

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

W. Li

LTC4126-ADJ

DEMO CIRTCUIT 3078A 02

07-29-2020

OPT

0805

LB1 LABEL

E11

PCB1 PCB, DC3078A REV02

8.87k

6.34k

2.2uF

0201 R6

OPT

JP1

RED

0603 E8

JP2

OPT

SPST-NO

1uF

2.2uF

30.1k

OPT

E12

CRx1

0.047uF

25V

0805

E13

E14

LRx1

13uH

760308101208

ACIN 7

GND

PROG

VCC 11

PBEN

ACPR

STAT1 10

OUT 12

BAT 8

CHRG

STAT2 9

NTC

E10

0201

MMSZ5226B

ADM8642

OUT

VCC A1

GND1

DIS B1

VIN C1

GND2

CHRG

BAT

VCC

PROG CHRG

VCC

BAT

PROG

DEMO MANUAL DC3080A-KIT

Rev. 0

SCHEMATIC DIAGRAM

D D

C C

B B

A A

REVISION HISTORY

ECO REV DESCRIPTION APPROVED DATE

-02 PROD. FAB W.Li 6/22/2020

PCA ADDITIONAL PARTS

UNLESS NOTED:

RESISTORS: OHMS, 0402, 1%, 1/16W

CAPACITORS: uF, 0402, 10%, 50V

0603

10mA 6mm APPLICATION-SIZED CHARGER WITH

1.2V STEP-DOWN DC-DC CONVERTER

LTC4126EV-ADJ

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

W.Li

LTC4126-ADJ

DEMO CIRCUIT 3079A 02

06-22-2020

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

W.Li

LTC4126-ADJ

DEMO CIRCUIT 3079A 02

06-22-2020

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

SCHEMATIC

SCALE = NONE

www.analog.com

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

W.Li

LTC4126-ADJ

DEMO CIRCUIT 3079A 02

06-22-2020

LB1 LABEL

CZRZ3V3B-HF

3.3V

LRx1

7.2uH

6mmX2mm

760308101216

COUT1

2.2uF

20%

16V

RED

CRx1

0.068uF

25V

PCB1 PCB, DC3079A REV02

8.87k

0201

ACIN

GND

PROG

VCC

PBEN

ACPR 5

STAT1 10

2OUT 12

BAT

CHRG

STAT2 9

NTC

BAT

Indice

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