Linear Analog Devices LTC4124 Guida rapida alla configurazione

DEMO MANUAL DC2770A-A-KIT

Rev. 0

DESCRIPTION

LTC4124/LTC4125, 50mA Wireless Li-Ion Charger

Demonstration Kit

DC2770A-A-KIT is a kit of the DC2773A-A transmitter

board (featuring LT C

4125) and the DC2775A-C (fea-

turing LTC

4124). The DC2775A-C receiver board can

charge a single Li-Ion battery at up to 50 mA with an

air gap of 3.0 mm to 5.0 mm between the transmit and All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

CONTENTS

BOARD PHOTO

receive coils. The DC2773A-A transmitter board supports

Foreign Object Detection via the LTC4125.

Design files for this circuit board are available.

Figure1. DC2773A-A Picture Figure2. DC2775A-C Picture

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

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

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

VBAT DC2775A-C 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-C Charge Current VBAT = 4.0V, ISEL1 = VCC, ISEL2 = GND 50 mA

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

fTX_TANK DC2773A-A Resonant Tank Frequency 200 kHz

fRX_TANK DC2775A-C Resonant Tank Frequency 200 kHz

1 × DC2773A-A (LTC4125) Transmitter Demo Board

1 × DC2775A-C (LTC4124) Receiver Demo Board

DEMO MANUAL DC2770A-A-KIT

Rev. 0

QUICK START PROCEDURE

Refer to Figures 3, 4, and 5 for the proper measurement

equipment setup, DC2775A-C mounting on DC2773A-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6 for proper scope probe

technique.

1. Place the DC2775A-C board atop the DC2773A-A 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 50mA. Battery charge voltage,

charge current, pre-charge feature and low battery

disconnect voltage can be programmed by jumpers

on the DC2775A-C board.

3. Connect a voltage source PS1 and a 20 Ohm resis-

tor RBAT1 between the BAT and GND turrets of

DC2775A-C, 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-C BAT turret. Connect a voltage meter

VM1between DC2775A-C BAT and GND turrets.

5. Connect a power supply (PS2) between DC2773A-A

turret and GND turret. DC2773A-A 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

supplies simultaneously. The DC2773A-A.D5 green

LED should be turned on, indicating the transmitter

is working properly. Note that current indicators on

DC2773A-A.D6-D13 does not reflect the real input cur-

rent in this version. It simply indicates a valid receiver

is found.

7. The DC2775A-C. D1 should be turned on, indicating

power is delivered to the load. Observe AM1. AM1

should be reading 50mA 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-A-KIT in Operation

DEMO MANUAL DC2770A-A-KIT

Rev. 0

TEST SETUP

Figure4. DC2775A-C Top

Figure5. DC2773A-A Top

+–

–

AM1

Battery Emulator

VM1

RBAT1

20

PS1

3.7V DC

0.5A

PS2

4.5–5.5V Supply

0.5A

–

DEMO MANUAL DC2770A-A-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.

DEMO MANUAL DC2770A-A-KIT

Rev. 0

THEORY OF OPERATION

The DC2770A-A-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-A – 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 SWXpin has positive

going current, is set to VIN for a duty cycle determined

by the corresponding PTHXpin. When the SWXpin 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

ILVL

Figure7. AutoResonant LC Tank Voltage and Current Waveforms

with Square Wave Input at less than 50% Duty Cycle

The LTC4125 also features optimum power search algo-

rithm. However, it is not implemented in this demo kit.

To check the operation details of optimum power search,

please refer to DC2770A-B-KIT demo manual.

In this demo kit, a 1V voltage reference ADR510 is placed

between IMON pin and GND. In this way, the exit condition

of the search algorithm is always triggered. As a result,

the duty cycle remains almost constant in the operation,

regardless of the change in load current or air gap dis-

tance. The duty cycle of the two half bridge drivers is

pre-defined by PTHM resistors R4 and R8.

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.

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 LTXand 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-C – Wireless Power Receiver Board

featuring the LTC4124

The DC2775A-C 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 V

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

DEMO MANUAL DC2770A-A-KIT

Rev. 0

THEORY OF OPERATION

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 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-C is 50mA and the charge voltage is

programmable by VSELXjumpers.

2V/DIV

ACIN

2V/DIV

BAT

2V/DIV

Figure8. Rectification of AC Input and Regulation of VCC

DEMO MANUAL DC2770A-A-KIT

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2773A-A: 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., 0.01uF, X7R, 25V, 10%, 0402, AEC-Q200 MURATA, GCM155R71E103KA37D

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 KEMET, C1206C223J5GACAUTO

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 Q2 IC VREF SHUNT 1V SOT23-3 ANALOG DEVICES, INC., ADR510ARTZ#PBF

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

19 1 R2 RES., 0.22 OHMS, 1W, 1206, AEC-Q200 WIDE

TERMINAL

PANASONIC, ERJB2BFR22V

20 1 R3 RES., 348 OHMS, 1%, 1/16W, 0402 VISHAY, CRCW0402348RFKED

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., 13.3k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040213K3FKED

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 R15 RES., 22.1K OHMS, 1%, 1/16W, 0402, THICK FILM,

AEC-Q200

VISHAY, CRCW040222K1FKEDC

27 1 R16 RES., 100k OHMS, 1%, 1/10W, 0603, 350V,

AEC-Q200

ROHM, KTR03EZPF1003

28 1 R18 RES., 10k OHMS, 5%, 1/16W, 0402 YAGEO, RC0402JR-0710KL

29 1 R43 RES., 1 OHM, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ1R0V

30 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

DEMO MANUAL DC2770A-A-KIT

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

6 2 R13, R45 RES., 0 OHM, 1/16W, 0402 NIC, NRC04ZOTRF

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-C: Required Circuit Components

1 1 C3 CAP., 10uF, X5R, 6.3V, 20%, 0603 MURATA, GRM188R60J106ME47D

2 1 CRx2 CAP., 0.047uF, C0G, 25V, 5%, 0805, AEC-Q200 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

DEMO MANUAL DC2770A-A-KIT

Rev. 0

SCHEMATIC DIAGRAM

4 4

3 3

2 2

1 1

UNLESS NOTED:

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

CAPACITORS: uF, 0402, 10%, 50V

4.75 - 5.25V

STATUS

DIS

OPT

0.5A

OPT

REVISION HISTORY

ECO DESCRIPTIONREV DATEAPPROVED

-PRODUCTION 06-11-19

VSUP

GND

SEE TABLE

DNP

037.4k

0.01uF 0.22 ohms ADR510ARTZ

R14

C5 Q1

0.047 ohms

DNP100k13.3k

R15

22.1k

R44

R46

R13 R45

348 DNP

PMBT3904M,316

DNP0 DNP

0.68uF

1.33k

VERSION TABLE

100mA-B

SKU#

50mA-A

Charge Current

DNP20k 0

VIN

IMON

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

ANALOG DEVICES 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 ANALO DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICE PARTS.

SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

DEVICES

Milpitas, CA 95035

Fax: (408)434-0507

www.analog.com

Phone: (408)432-1900

ANALOG

1630 McCarthy Blvd.

AHEAD OF WHAT'S POSSIBLE

LTC4125

50mA/100mA AUTORESONANT WIRELESS TRANSMITTER

700-DC2773A_REV02

710-DC2773A_REV01

705-DC2773A_REV01

N/A

06-11-19

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

ANALOG DEVICES 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 ANALO DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICE PARTS.

SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

DEVICES

Milpitas, CA 95035

Fax: (408)434-0507

www.analog.com

Phone: (408)432-1900

ANALOG

1630 McCarthy Blvd.

AHEAD OF WHAT'S POSSIBLE

LTC4125

50mA/100mA AUTORESONANT WIRELESS TRANSMITTER

700-DC2773A_REV02

710-DC2773A_REV01

705-DC2773A_REV01

N/A

06-11-19

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

ANALOG DEVICES 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 ANALO DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICE PARTS.

SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

DEVICES

Milpitas, CA 95035

Fax: (408)434-0507

www.analog.com

Phone: (408)432-1900

ANALOG

1630 McCarthy Blvd.

AHEAD OF WHAT'S POSSIBLE

LTC4125

50mA/100mA AUTORESONANT WIRELESS TRANSMITTER

700-DC2773A_REV02

710-DC2773A_REV01

705-DC2773A_REV01

N/A

06-11-19

100k

4700pF

BAS521-7

R46

R43

C12

47uF

0805

2.2k

RED

JP1

U1 LTC4125-UFD

GND

PGND

IN1

IN2

SW1 19

SW2 18

IS-

3IS+

13 NTC

IIMON

CTS

CTD

STAT 8

PTHM

PTH1

PTH2

DTH

FTH

LTx1

6.8uH

760308101104

BAT54LP

100uF

1206

C10

1uF

JSC connector

NTC1

R13

R16

100k

0603

R11

OPT

R45

R12

102k

MICRO USB-B

VBUS 1

D- 2

D+ 3

ID 4

GND 5

GND

9GND 7

GND 6

OPT

R15

PMBT3904M,315

3.24k

100k

C11

47uF

0805

GREEN

R42

OPT

TP1

0.01uF

CRx2

0.022uF 1206

R10

100k

R17

2.2k

100uF

1206

TP2

0.1uF

0603

100V

X7R

0.1uF

100uF

1206

CDBQR70

R14

CRx1

0.068uF 1206

ADR510ARTZ

TP3

680pF

R44

R18

10k

DEMO MANUAL DC2770A-A-KIT

Rev. 0

SCHEMATIC DIAGRAM

4 4

3 3

2 2

1 1

INPUT CURRENT

1.221V

DIS

MONITOR

U3.3

U2.3

1.186V

PCA ADDITIONAL PARTS

BAR GRAPH FOR AUTORESONANT WIRELESS TRANSMITTER

SEE TABLE

150%

100%

85%

71%

57%

43%

29%

14%

IMON

VIN

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

ANALOG DEVICES 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 ANALO DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICE PARTS.

SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

DEVICES

Milpitas, CA 95035

Fax: (408)434-0507

www.analog.com

Phone: (408)432-1900

ANALOG

1630 McCarthy Blvd.

AHEAD OF WHAT'S POSSIBLE

LTC4125

700-DC2773A_REV02

710-DC2773A_REV01

705-DC2773A_REV01

N/A

06-11-19

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

ANALOG DEVICES 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 ANALO DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICE PARTS.

SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

DEVICES

Milpitas, CA 95035

Fax: (408)434-0507

www.analog.com

Phone: (408)432-1900

ANALOG

1630 McCarthy Blvd.

AHEAD OF WHAT'S POSSIBLE

LTC4125

700-DC2773A_REV02

710-DC2773A_REV01

705-DC2773A_REV01

N/A

06-11-19

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

CUSTOMER NOTICE

ANALOG DEVICES 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 ANALO DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICE PARTS.

SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

DEVICES

Milpitas, CA 95035

Fax: (408)434-0507

www.analog.com

Phone: (408)432-1900

ANALOG

1630 McCarthy Blvd.

AHEAD OF WHAT'S POSSIBLE

LTC4125

700-DC2773A_REV02

710-DC2773A_REV01

705-DC2773A_REV01

N/A

06-11-19

R38

6.2k

MP2 STANDOFF,NYLON,SNAP-ON,0.50"

R30

75k

U2D

LTC1445-DHD

14 9

R28

75k

U3B

LTC1445-DHD

14 9

R40

6.2k

R26

75k

MP6 STANDOFF,NYLON,SNAP-ON,0.50"

R24

75k

U3E

LTC1445-DHD

REF

V-

D12

BLUE

U3C

LTC1445-DHD

14 9

MP10 STANDOFF,NYLON,SNAP-ON,0.50"

D10

BLUE

R41

2.2k

R33

430

C15

0.01uF

JP2

1 3

BLUE

R35

6.2k

BLUE

NTC_ASSEMBLY_1 RES.,10k OHMS,1%,NTC THERMISTOR

R22

27.4k

U3D

LTC1445-DHD

14 9

R37

6.2k

R21

15.4k

U2A

LTC1445-DHD

14 9

D13

OPT

R31

11.3k

R39

6.2k

R29

75k

R20

430

R27

75k

C14

1uF

MP5 STANDOFF,NYLON,SNAP-ON,0.50"

R25

75k

MP1 STANDOFF,NYLON,SNAP-ON,0.50"

U2B

LTC1445-DHD

14 9

R32

787k

MP7 STANDOFF,NYLON,SNAP-ON,0.50"

R19

10k

C13

0.01uF

D11

BLUE

R23

511k

TAPE,3/4" x 36yds,DOUBLE SIDED POLYIMIDE KAPTON

BLUE

U2E

LTC1445-DHD

REF

V-

C17

1uF

C16

0.01uF

U2C

LTC1445-DHD

14 9

EPOXY ADHESIVE,HEAT CURE THERMAL,GREY,30cc SYRINGE

LB1 LABEL

PCB1 PCB, DC2773A REV01

U3A

LTC1445-DHD

14 9

R34

6.2k

BLUE

R36

6.2k

STNCL1 TOOL, STENCIL, 700-DC2773A REV01

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