Linear Technology DC2181A Series Quick setup guide

dc2181afa

DEMO MANUAL

DC2181A-A/B

Description

LTC4120EUD

Wireless Power Receiver

and 400mA Buck Battery Charger

Demonstration circuit 2181 is an LT C

4120EUD demon-

stration board. The DC2181 is used with the DC1968A

wirelesspowertransmitterorthePowerByProxiProxiPoint

transmitter (both available separately). Either can deliver

2W to the DC2181, with up to 10mm spacing between

the transmitter and the receive coil. The basic transmitter

doesn’tsupportforeignmetalobjectdetection. Transmitters

available separately. See last page for details.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

performance summary

BoarD photo

FEATURED PART

DC2181A-A LTC4120EUD-4.2 (Fixed Output)

DC2181A-B LTC4120EUD (Adjustable Output)

Design files for this circuit board are available at

http://www.linear.com/demo/DC2181A

Specifications are at TA= 25°C

Figure 1. DC2181 Wireless Power Receiver Demo Board

Figure 2. DC1968A Wireless Power Basic Transmitter Demo Board Figure 3. PowerByProxi ProxiPoint Transmitter

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

HVIN DC1968A High Voltage Input Voltage Range IHVIN ≤ 500mA at HVIN = 8V 8 38 V

VCC DC1968A VCC Input Range IVCC = 0 ~ 700mA 4.75 5.25 V

V(BAT) DC2181A BAT Pin Voltage R9 = 1.40MΩ, R10 = 1.05MΩ 2.5 4.25 V

I(BAT) DC2181A BAT Pin Current V(BAT) = 3.7V, DC1967A(R5) = 3.01kΩ, All Bar

Graph LEDs on.

370 380 390 mA

OR OR

NOTE: These boards

are not included with

DC2181 and must be

ordered separately.

Seelastpagefordetails.

dc2181afa

DEMO MANUAL

DC2181A-A/B

assemBly test proceDure

For the proper measurement equipment setup and jumper

settings refer to Figure 6a, if you are using the DC1968A

wireless power basic transmitter, or Figure 5a, if you are

usingthe PowerByProxi ProxiPoint transmitter. Please fol-

low the checkout procedure, below, to familiarize yourself

with the DC2181 demo board.

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 VCC or VIN and GND terminals. See Figure 4 for

proper scope probe technique.

1. Connect power to the transmitter. For the DC1968A

basic transmitter set PS1 to 5V, and turn on. For the

PowerByProxi ProxiPoint transmitter, plug in the

power supply that came with the transmitter.

2. Set PS2 to 3.6V, and turn the supply on. PS2 is the

battery emulator battery voltage. The purpose of the

3.6Ω is to make PS2 into a bipolar supply. Most power

suppliescanonly sourcecurrent not sink current,bipolar

supplies can do both. A bipolar supply is necessary for a

battery emulator, as it must absorb the current coming

from the charger. By placing a 3.6Ω resistor in parallel

with a normal supply, the supply can absorb up to 1A,

at 3.6V.

3. Place the DC2181A receive board on the transmitter as

shown in Figure 5c, if you are using the PowerByProxi

ProxiPoint transmitter. Or as shown in Figure 6c, if

using the DC1968A. Note: for the ProxiPoint transmit-

ter, the LED the ProxiPoint transmitter should change

from green to solid red. If the LED turns blinking red,

please remove the DC2181A board, wait until the LED

turns green, and once again place the DC2181 on the

transmitter. If the ProxiPoint transmitter LED does not

change to solid red on the second try, please contact

your FAE.

4. The green bar graph LEDs on the DC2181 demo board

should light. Observe AM1, there is an additional 10mA

flowing from the BAT into the bar graph LEDs. Please

ensure that VM1 measures less than 4V. If not lower

PS2 until it does.

The bar graph LEDs indicate the percent of programmed

charge current flowing into the battery. They do so by

monitoring the PROG voltage. PROG will be 1V, at full

programmed charge current.

If you lower the battery emulator voltage, by lowering

PS2, until VM1 reads approximately 2.9V, you will see

the bar graph drop to 10%. This is the trickle current,

which is set to 10% of the programmed charge current.

5. Test is complete.

Figure 4. Proper Measurement Technique for Measuring Ripple

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DEMO MANUAL

DC2181A-A/B

Figure 5a. DC2181A-A/B Wireless Power Demo Board Connection

Figure 5b. PowerByProxi’s ProxiPoint Transmitter

Figure 5c. DC2181A-A/B Wireless Power Demo Board Mounted on PowerByProxi’s ProxiPoint Transmitter

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.

assemBly test proceDure

3.6Ω3.6V POWER SUPPLY

VM1

AM1

PS1 –

–

–+

dc2181afa

DEMO MANUAL

DC2181A-A/B

assemBly test proceDure

Figure 6a. DC2181A-A/B Wireless Power Demo Board Connection

Figure 6b. DC1968A Wireless Power Basic Transmitter Connection

Figure 6c. DC2181A-A/B Wireless Power Demo Board Mounted on

DC1968A Wireless Power Basic Transmitter

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.

3.6Ω3.6V BIPOLAR SUPPLY

VM1

AM1

PS2 –

–

–+

5V POWER SUPPLY

PS1

–

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DEMO MANUAL

DC2181A-A/B

theory of operation

Figure 7. DC1968A Basic Transmitter

The DC2181A demo board demonstrates operation of a

doubletuned magnetically coupled resonant power transfer

circuit. The DC2181A demo Board must be used in con-

junction with either the DC1968A wireless power basic

transmitter or the PowerByProxi ProxiPoint transmitter.

For theory of operation of the PowerByProxi ProxiPoint

transmitter, please refer to the ProxiPoint documentation.

DC1968A – Basic Transmitter

The DC1968A basic transmitter is used to transmit wire-

less power and is used in conjunction with the DC2181A

wireless power receiver board featuring the LTC4120.

The DC1968A is configured as a current fed astable multi-

vibrator, with oscillation frequency set by a resonant tank.

The DC1968A basic transmitter is set to 130kHz operation

and the DC1967A LTC4120 demonstration board resonant

frequency is 127kHz with DHC enabled and 140kHz with

DHC disabled. For the DC1968A basic transmitter the

resonant components are the 2X0.15µF PPE film capaci-

tors (Cx1 and Cx2) and the 5.0µH(Lx) transmit coil (see

Schematic: Basic Inductive Transmitter with Pre-

Regulator). This gives a resonant frequency of 129.95kHz.

The tolerance on the transmit coil and resonant capacitors

is ±2%, or 2.6kHz. Inductors L1 and L2 are used to make

the resonant structure current fed.

The current fed topology makes the peak-to-peak voltage

on the resonant tank equal to 2πVCC. VCC is 5V, so the

peak-to-peak tank voltage is 31.5V, see Figure 7.

2µs/DIV

VCx-Cy

20V/DIV

VCx

10V/DIV

VCy

10V/DIV

DC2181A F07

The blue and green traces are the drains of the transmit-

ter MOSFETs M1 and M2 (see Schematic: Basic Inductive

ransmitter with Pre-Regulator), respectively. The red

trace is the difference (VCX – VCY) of those two nodes,

and shows that the resonant tank is producing a sine

wave. The peak-to-peak voltage of 2πVCC = 31.5V, results

from the current fed topology. This in turn determines

the breakdown of the MOSFETs and diodes D2 and D3.

To increase transmit power by raising VCC, you must also

change M1, M2, D2 and D3, to reflect the higher voltages

on the CXand CYnodes.

The magnitude of the magnetic field is directly proportional

to the current in the transmit coil. For a resonant system

this current is Q times the input current. So the higher the

Q the larger the magnetic field. Therefore the transmit coil

is constructed with Litz wire, and the resonant capacitors

are very low dissipation PPS film capacitors. This leads

to a Q of approximately 10 at 130kHz, and a circulating

current of approximately 6AP-P, at full load.

DC2181 – Wireless Power Receiver Board Featuring

the LTC4120

The DC2181 LTC4120 wireless power receiver IC imple-

ments dynamic

harmonization control (DHC), which tunes

or detunes the receive circuit to receive more or less

power as needed. The primary receive tank is composed

of AE1, and C2S, although it must be noted that C2S is AC

grounded through C5, the LTC4120 decoupling capacitor,

to be in parallel with AE1. C2S also serves to tap power

off the resonant circuit and send it to the LTC4120, (see

Schematic: 400mA Wireless Synchronous Buck Battery

Charger).

dc2181afa

DEMO MANUAL

DC2181A-A/B

theory of operation

The waveforms in Figure 8 were captured at a transmit-

to-receive gap of 8mm. The blue trace is the waveform at

the CXpin of the receiver board (see Schematic: 400mA

Wireless Synchronous Buck Battery Charger), and the

red trace is the charge current into the battery. Although

the transmit waveform is a sine wave, the series-parallel

connection of the secondary resonant circuit does not

yield a sine wave, and this waveform is correct. The charge

current into the battery has an average of ≈ 400mA, for a

delivered power of 1.5W(VBAT = 3.7V). However, 10mA

has been diverted to the charge LEDs, for a net battery

charge current of 390mA. The ripple on the charge current

is synchronous to the transmit waveform.

Summary

The LTC4120 wireless power receiver IC adjusts the

receiver resonant frequency to keep the system from

transferring too much power when the coupling is high

between transmit and receive coils. The LTC4120 wireless

power receiver IC increases power transfer when power

transfer is insufficient. This is accomplished by switching

capacitors into the resonant circuit using the DHC pin. This

gives a much wider operating transmit distance.

Figure 9 shows VIN to the LTC4120 and the battery charge

current. The blue trace is the charge current into the bat-

tery, and the red trace is the voltage at VIN on the receiver

board. VIN is about 25V, while the LTC4120 delivers 1.5W

at a distance of 8mm, to the battery. There is negligible

transmit frequency ripple on VIN, and the voltage is well

above the 14V DHC voltage. This indicates that the input

rectifiers are operating in peak detect mode, and that DHC

is inactive.

Figure 9. DC2181A Receiver

2µs/DIV

VIN TO GND

5V/DIV

DC2181A F09

IBAT

100mA/DIV

VBAT = 3.7V

Figure 8. DC2181A Receiver Board

2µs/DIV

IBAT

VBAT = 3.7V

100µA/DIV

DC2181A F08

Cx TO GND

20V/DIV

DHC

When VIN is above 14V, the DHC pin is open and C2P

doesn’t enhance the energy transfer; this is the detuned

state, and the resonant frequency of the receive tank is

142kHz.WhenVIN fallsbelow 14V,the DHCpin is grounded

putting C2P in parallel with both C2S and AE1 thus chang-

ing the resonant frequency to 127.4kHz. When the receiver

is tuned at 127.4kHz and drawing significant power, the

transmit frequency is pulled down to 127kHz. So, at full

power the system is now a double-tuned resonant circuit.

Figure 10 shows approximate power transfer vs distance

between transmitter and receiver. Note the minimum

clearance. The minimum is needed to avoid exceeding

the maximum input voltage.

dc2181afa

DEMO MANUAL

DC2181A-A/B

theory of operation

AE1, the Receive Antenna

One of the main differences between the DC1967A and the

DC2181 demo boards, is that the wireless power receive

antenna is separate for the DC2181 demo board.

Several antennas were tested, with the criteria of pass-

ing 2.5W at 8mm spacing. The following table lists the

antennas that passed successfully:

MANUFACTURER CONSTRUCTION MFG PART NUMBER

TDK Ferrite on PCB B67410-A0223-X195

Inter-Technical Ferrite on PCB L41200R01

Inter-Technical Ferrite on PCB L41200R02*

Inter-Technical Litz on Ferrite L41200R03

Inter-Technical Litz on Ferrite L41200R04

Inter-Technical Ferrite on PCB L41200R05

TDK Wire on Ferrite WR282830-37M8-LR4

Würth Wire on Ferrite 760308101303

*AE1 wireless power receive antenna shipped with DC2181

The manufacturers can be contacted at:

Inter-Technical www.inter-technical.com, search for LTC4120

TDK www.tdk.components.com

Würth http://katalog.we-online.de/pbs/

datasheet/760308101303.pdf

AE1 is physically mounted with double sided tape, as well

as the electrical connection pins. Removing AE1 is likely

to damage the ferrite on the backside of the antenna. Only

remove AE1 when you have the a suitable replacement

at hand.

Figure 10. Power Transfer vs Axial Distance and Misalignment

17mm

Full Power

±1mm

½ Power

±1mm

½ Power

Envelope

18mm

13mm

15mm

2mm

3mm

4mm

5mm

6mm

7mm

8mm

9mm

Full Power

Envelope DC1967A-B with

25mm Receive

Antenna

DC2181A F10

Transmit Antenna

1mm Minimum Clearance

dc2181afa

DEMO MANUAL

DC2181A-A/B

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2181A General Bill of Materials

DC2181A Required Circuit Components

1 1 AE1 RECEIVE ANTENNA INTER-TECHNICAL, L41200R02

2 2 C2S1, C2P1 CAP, CHIP, C0G, 0.0047μF, ±5%, 50V, 0805 MURATA, GRM2165C1H472JA01D

3 1 C2P2 CAP, CHIP, C0G, 0.0018μF, ±5%, 50V, 0603 KEMET, C0603C182J5GAC7533

4 1 C2S2 CAP, CHIP, C0G, 0.022μF, ±5%, 50V, 0805 MURATA, GRM21B5C1H223JA01L

5 1 C1 CAP, CHIP, X5R, 10μF, ±20%, 16V, 0805 TDK, C2012X5R1C106K

6 1 C2 CAP, CHIP, X5R, 47μF, ±10%, 16V, 1210 MURATA, GRM32ER61C476KE15L

7 1 C3 CAP, CHIP, X7R, 0.01μF, ±10%, 50V, 0603 TDK, C1608X7R1H103K

8 1 C4 CAP, CHIP, X5R, 2.2μF, ±20%, 6.3V, 0402 MURATA, GRM155R60J225ME15D

9 1 C5 CAP, CHIP, X7S, 10μF, ±20%, 50V, 1210 TDK, C3225X7S1H106M

10 3 D1, D2, D3 DIODE, SCHOTTKY, 40V, 2A, PowerDI123 DIODES, DFLS240L-7

11 1 L1 IND, SMT,15μH, 260mΩ, ±20%, 0.86A, 4mm × 4mm COILCRAFT, LPS4018-153ML

12 1 R1 RES, CHIP, 1.40M, ±1%, 1/16W, 0402 VISHAY, CRCW04021M40FKED

13 1 R2 RES, CHIP, 412kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402412KFKED

14 2 R3, R7 RES, CHIP, 10kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040210K0FKED

15 1 R5 RES, CHIP, 3.01kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW04023K01FKED

16 1 R36 RES, CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

Additional Demo Board Circuit Components

1 3 C6, C8, C9 CAP, CHIP, X7R, 0.01μF, ±10%, 25V, 0402 TDK, C1005X7R1E103K

2 2 C7, C10 CAP, CHIP, X5R, 1μF, ±10%, 16V, 0402 TDK, C1005X5R1C105K

3 1 D4 DIODE, ZENER, 39V, ±5%, 1W, PowerDI123 DIODES, DFLZ39

4 8 D5, D6, D7, D8, D9, D10,

D11, D12

DIODE, LED, GREEN, 0603 LITE-ON, LTST-C193KGKT-5A

5 1 R4 RES, CHIP, 2kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW04022K00JNED

6 2 R11, R12 RES, CHIP, 100kΩ, ±5%,1/16W, 0402 VISHAY, CRCW0402100KJNED

7 1 R13 RES, CHIP, 10kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW040210K0JNED

8 2 R14, R35 RES, CHIP, 432Ω, ±1%, 1/16W, 0402 VISHAY, CRCW0402432RFKED

9 2 R15, R33 RES, CHIP, 22.6kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040222K6FKED

10 1 R16 RES, CHIP, 34.8kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040234K8FKED

11 7 R17, R18, R19, R20,

R21, R22, R23

RES, CHIP, 100kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED

12 1 R24 RES, CHIP, 49.9kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040249K9FKED

13 8 R25 TO R32 RES, CHIP, 1kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW04021K00JNED

14 1 R34 RES, CHIP, 787kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402787KFKED

15 2 R6, R38 RES, CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

16 0 R8-OPT, R37-OPT RES, CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

17 2 U2, U3 ULTRALOW POWER QUAD COMPARATORS WITH

REFERENCE, 5mm × 4mm DFN16

LINEAR TECHNOLOGY, LTC1445CDHD

dc2181afa

DEMO MANUAL

DC2181A-A/B

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2181A-A Required Circuit Components

1 0 R9 NO LOAD. SMD 0402

2 1 R10 RES, CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

3 1 U1 400mA WIRELESS SYNCHRONOUS BUCK BATTERY

CHARGER, 3mm × 3mm QFN16

LINEAR TECHNOLOGY, LTC4120EUD-4.2

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2181A-B Required Circuit Components

1 1 R9 RES, CHIP, 1.40M, ±1%, 1/16W, 0402 VISHAY, CRCW04021M40FKED

2 1 R10 RES, CHIP, 1.05M, ±1%, 1/16W, 0402 VISHAY, CRCW04021M05FKED

3 1 U1 400mA WIRELESS SYNCHRONOUS BUCK BATTERY

CHARGER, 3mm × 3mm QFN16

LINEAR TECHNOLOGY, LTC4120EUD

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware: For Demo Board Only

1 4 E3, E4, E7, E8 TURRET, 0.091˝ MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 E1, E2, E5, E6 TURRET, 0.061˝ MILL-MAX, 2308-2-00-80-00-00-07-0

3 2 J1, J2 HEADER, 1PIN, 0.020˝ × 0.020˝ SAMTEC, TMM-101-02-L-S

4 0 J3-OPT CONN, 3 PIN POLARIZED HIROSE, DF3-3P-2DSA

5 2 BP1, BP2, BP3, BP4 CLEAR 0.200˝ × 0.440˝ BUMPER KEYSTONE, 785-C

6 0.00058 3M, 0.5IN WIDE, 1/16IN THICK, DOUBLE SIDED FOAM

TAPE, 0.75IN × 0.50IN PIECE

3M, 4466

7 4 STAND-OFF, NYLON, 0.375˝ KEYSTONE, 8832

dc2181afa

DEMO MANUAL

DC2181A-A/B

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1968A Bill of Materials

DC1968A Required Circuit Components

1 1 CX1, CX2 CAP, CHIP, PPS, 0.15µF, ±2%, 50V, 6mm × 4.1mm PANASONIC, ECHU1H154GX9

2 2 C4, C5 CAP, CHIP, X7R, 0.01µF, ±10%, 50V, 0402 MURATA, GRM155R71H103KA88D

3 1 C6 CAP, CHIP, X7R, 4.7µF, ±10%, 50V, 0402 MURATA, GRM31CR71H475KA12L

4 1 C7 CAP, CHIP, X5R, 0.068µF, ±10%, 50V, 0603 MURATA, GRM188R71H683K

5 1 C8 CAP, CHIP, C0G, 330pF, ±5%, 50V, 0402 TDK, C1005COG1H331J

6 1 C9 CAP, CHIP, X7R, 0.47µF, ±10%, 25V, 0603 MURATA, GRM188R71E474K

7 1 C10 CAP, CHIP, X5R, 22µF, ±20%, 6.3V, 0805 TAIYO-YUDEN, JMK212BJ226MG

8 2 D1, D4 DIODE, ZENER, 16V, 350mV, SOT23 DIODES, BZX84C16

9 2 D2, D3 DIODE, SCHOTTKY, 40V, 1A, 2DSN ON SEMICONDUCTOR, NSR10F40NXT5G

10 1 D5 DIODE, SCHOTTKY, 40V, 2A, PowerDI123 DIODES, DFLS240L

11 2 L1, L2 IND, SMT, 68µH, 0.41A, 0.40Ω, ±20%, 5mm × 5mm TDK, VLCF5028T-680MR40-2

12 1 L3 IND, SMT, 4.7µH, 1.6A, 0.125Ω, ±20%, 4mm × 4mm COILCRAFT, LPS4018-472M

13 1 Lx TRANSMIT COIL TDK, WT-505060-8K2-LT

14 2 M1, M2 MOSFET, SMT, N-CHANNEL, 60V, 11mΩ, SO8 VISHAY, Si4108DY-T1-GE3

15 1 M3 MOSFET, SMT, P-CHANNEL, –12V, 32mΩ, SOT23 VISHAY, Si2333DS

16 1 M4 MOSFET, SMT, N-CHANNEL, 60V, 7.5Ω, 115mA, SOT23 ON SEMI, 2N7002L

17 2 R1, R2 RES, CHIP, 100Ω, ±5%, 1/16W, 0402 VISHAY, CRCW0402100RJNED

18 2 R3, R8 RES, CHIP, 150kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW0402150JNED

19 1 R4 RES, CHIP, 40.2kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040240K2FKED

20 1 R5 RES, CHIP, 20kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040220K0FKED

21 2 R6, R10 RES, CHIP, 100kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED

22 1 R7 RES, CHIP, 536kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402536KFKED

23 1 U1 LT3480EDD, PMIC 38V, 2A, 2.4MHz STEP-DOWN SWITCHING

REGULATOR WITH 70µA QUIESCENT CURRENT

LINEAR TECHNOLOGY, LT3480EDD

Additional Demo Board Circuit Components

1 0 CX3-OPT, CX4-OPT CAP, PPS, 0.15µF, 2.5%, 63VAC, MKS02 WIMA, MKS0D031500D00JSSD

2 1 D6 LED, GREEN, 0603 LITE-ON, LTST-C190KGKT

3 1 R9 RES, CHIP, 1kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW04021K00JNED

Hardware: For Demo Board Only

1 6 E1 TO E6 TURRET, 0.09 DIA MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 STAND-OFF, NYLON, 0.375˝ KEYSTONE, 8832

parts list

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