LTC4120/LTC4120-4.2

21

4120ff

For more information www.linear.com/LTC4120

APPLICATIONS INFORMATION

Table 4. Recommended Transmitter and High Voltage Pre-Regulator Components

Transmitter Components

ITEM

DESCRIPTION

MANUFACTURER/PART NUMBER

D2, D3

DIODE, SCHOTTKY, 40V, 2A

ON SEMI NSR10F40NXT5G

D1, D4

DIODE, ZENER, 16V, 350mW, SOT23

DIODES BZX84C16

M1, M2

MOSFET, SMT, N-CHANNEL, 60V, 11mΩ, S08

VISHAY Si4470EY-T1GE3

IND, SMT, 68µH, 0.41A, 0.4Ω, ±20%

TDK VLCF5028T-680MR40-2

C4, C5

CAP, CHIP, X7R, 0.01µF, ±10%, 50V, 0402

MURATA GRM155R71H103KA88D

R1, R2

RES, CHIP, 100Ω, ±5%, 1/16W, 0402

VISHAY CRCW0402100RJNED

CAP, CHIP, PPS, 0.15µF, ±2%, 50V

PANASONIC ECHU1H154GX9

CAP, CHIP, PPS, 0.1µF, ±2%, 50V

PANASONIC ECHU1H104GX9

CAP, CHIP, PPS, 0.033µF, ±2%, 50V

PANASONIC ECHU1H333GX9

CAP, PPS, 0.15µF, ±2.5%, 63VAC, MKS02

WIMA MKS0D031500D00JSSD

CAP, PPS, 0.10µF, ±2.5%, 63VAC, MKS02

WIMA MKS0D03100

CAP, PPS, 0.033µF, ±2.5%, 63VAC, MKS02

WIMA MKS0D03033

5.0µH TRANSMIT COIL

TDK WT-505060-8K2-LT

or 6.3µH TRANSMIT COIL

TDK WT-505090-10K2-A11-G

or 6.3µH TRANSMIT COIL

WÜRTH 760308111

or 5.0µH TRANSMIT COIL

INTER-TECHNICAL L41200T02

High Voltage Pre-Regulator Components

U1

LT3480EDD, PMIC 38V, 2A, 2.4MHz Step-Down Switching

Regulator with 70µA Quiescent Current

LINEAR TECH LT3480EDD

M3

MOSFET, SMT, P-CHANNEL, –12V, 32mΩ, SOT23

VISHAY Si2333DS

M4

MOSFET, SMT, N-CHANNEL, 60V, 7.5Ω, 115mA, SOT23

ON SEMI 2N7002L

D5

DIODE, SCHOTTKY, 40V, 2A, POWERDI123

DIODES DFLS240L

L3

IND, SMT, 4.7µH, 1.6A, 0.125Ω, ±20%

COILCRAFT LPS4018-472M

C6

CAP, CHIP, X5R, 4.7µF, ±10%, 50V, 1206

MURATA GRM155R71H4755KA12L

C7

CAP, CHIP, X5R, 4.7µF, ±10%, 50V, 0603

MURATA GRM188R71H683K

C8

CAP, CHIP, COG, 330pF, ±5%, 50V, 0402

TDK C1005COG1H331J

C9

CAP, CHIP, X7R, 0.47µF, ±10%, 25V, 0603

MURATA GRM188R71E474K

C10

CAP, CHIP, X5R, 22µF, ±20%, 6.3V, 0805

TAIYO-YUDEN JMK212BJ226MG

R3, R8

RES, CHIP, 150k, ±5%, 1/16W, 0402

VISHAY CRCW0402150JNED

R4

RES, CHIP, 40.2k, ±1%, 1/16W, 0402

VISHAY CRCW040240K2FKED

R5

RES, CHIP, 20k, ±1%, 1/16W, 0402

VISHAY CRCW040220K0FKED

R6, R10

RES, CHIP, 100k, ±1%, 1/16W, 0402

VISHAY CRCW0402100KFKED

R7

RES, CHIP, 536k, ±1%, 1/16W, 0402

VISHAY CRCW0402536KFKED

soldering. Plastic film capacitors such as Panasonic ECHU series or Metallized Polypropylene capacitors such as WIMA MKP as suitable for the

transmitter

as well as the load at the receiver. The tolerance of the

components selected in both the transmitter and receiver

circuits is critical to achieving maximum power transfer.

The voltages across the receiver components may reach

40V, so adequate voltage ratings must also be observed.

Resonant Converter Component Selection

It is recommended to use the components listed in Table 4

and Table 5 for the resonant transmitter and receiver

respectively. Figure 12 illustrates the PCB layout of the

embedded receiver coil. Figures 13 and 14 show the

finished transmitter and receiver. The 25mm ferrite bead