Wire Wound SMD Power Inductor SWPA Series

Sunlord Power Inductor

Wire Wound SMD Power inductorWire Wound SMD Power inductorSWPA SeriesSWPA Series

High PerformanceSpace- and Power-saving

Innovative Low Cost Technology Full Automatic Process


SWPA Series Power Inductor Features

Unique Compact Component Structure

High Performance, Space & Power Savings

Full Automatic Production Technologies

Main Electrical Parameters

Ordering Information

Product Lines

Applications and Cross Reference

Selection Guide

Typical Applications

Cross Reference

Outline


Power Inductor Conception

Inductors/Coils

for power lines

for signal lines

Semiconductor power supply circuits DC-DC switch circuits

Electrical signal Transmission circuits

always called power inductors

UsesApplication

Noise suppression RectificationSmoothing

FilteringResonationImpedance matching

Functions



SWPA Series Structure Conventional Structure

SWPA structure makes the lowest profile power inductor possible , offers an excellent combination of high current , high inductance and low DC resistance!


Conventional: The air gap between magnetic ring and core formed single and big.

Resin

Ferrite Grain

Air Gap

电线磁芯磁环

气隙

Wire Ferrite Core Ring Core

Air Cap


SWPA: The air gaps between magnetic powders formed uniform and multiple.


The SWPA series can endure larger DC bias current than sleeve structure due to its multiple air gaps. What’s more, the saturation angle can be tuned by adjusting the percentage of magnetic powder and glue.

Multiple air caps of SWPA Series Single air cap of Sleeve Type

Large Saturation Current


Magnetic-resin shielded construction reduces buzz noise to ultra-low levels

Sleeveless square-core winding makes full use of core space and thickens lead

wire inside inductor to achieve lowest possible DC resistance

Minimizes heat generation and maximizes efficient use of battery power

30% Higher current rating than conventional inductors of equal size, takes up

less PCB real estate

Metallization on Ferrite Core results in excellent shock resistance and damage-

free durability

Closed magnetic circuit design reduces leakage flux and Electro Magnetic

Interference (EMI)

Features


High Performance, Space & Power Savings

Higher Saturation Current than conventional inductors of the same size

SWPA6045S100M VS Conventional Structure 10μH（equal size）

-70%

-60%

-50%

-40%

-30%

-20%

-10%

0%

10%

0 0.5 1 1.5 2 2.5 3 3.5 4Current (A)

△L/

L

SWPA6045S100M Conventional Structure 10μH(equal size)


100

HDD

Process Flow

Sorting and Packing Drying Printing Soldering

DryingGluingWindingMetal electrodes


Full Automatic Production TechnologiesFull Automatic Production Technologies

For the same output, compared with conventional process, SunlordInnovative process saves 80% labor force and 50% manufacture space

Products have higher quality and reliability as automatic process minimizesdifferences among operators

Conventional ProcessSunlord Automatic Process


L: inductance

DCR: DC resistance

DCI1: DC overlap current

DCI2: temperature rise current

SRF: self-resonance frequency

Main Electrical ParametersMain Electrical Parameters


L (inductance):

As for an ideal inductor, the inductance L is changeless. But among the practical measurement process, the value of L can not be gotten directly. In fact, L is calculated by measuring Z, where Z=R+jX. So L is X/ω（X/2πf）in practically. Due to the distributing capacitance, the measuring value of L shows a frequency dependent as follows:

Inductance Tolerrance

The precision of the standard inductance is reflected by the exactitude alphabit ±30%N

±20%M

±15%L

±10%K

Inductance toleranceNumber

1 mH = 10-3 H1 µH = 10-6 H1 nH = 10-9 H



DCR (DC Resistance):

DCR is the direct-current resistance of the lead between the electrodes. In other words, it is the value of U/I when DC volts imposed on the electrodes.



DCI1（Saturation Current） DCI2（Heat Rating Current）

DCI1

30%

Saturation Current Heat Rating Current

The external temperature will increase under continual current. The Heat Rating Current is defined as the current that causes the body temperature rise 40℃ from 20℃ambient.

The inductance will decrease under continual current. The Saturation Current is defined as the current at which the inductance drops by 30%.

DC-current DC-current



Stray capacitance exist between wires and electrodes

SRF (self-resonance frequency):

When the frequency F0 of the AC current reaches a certain value which satisfies the following formula, which means resonance takes place in the inductor, and we call the frequency SRF.

Equivalent Circuit

L：ideal inductance

R：DC-Resistance

Cd：Stray capacitance



SWPASWPA 60456045 SS 100100 MM TT①① ②② ③③ ④④ ⑤⑤ ⑥⑥

②② External Dimension (L/W×H) (mm)

6045 6.0X6.0×4.5

① Type

SWPA Wire Wound SMD Power Inductor

③ Feature Type

S standard product

⑤ Inductance tolerance

M ±20%N ±30%

⑥ packing

T Tape Carrier Package

④ Nominal Inductance

Example Norminal value1R0 1.0uH100 10uH101 100uH

Ordering informationOrdering information


SWPA8040S

SWPA6045SSWPA6028SSWPA6020SSWPA6012S

SWPA4030SSWPA4020S

SWPA4012S

SWPA3015SSWPA3012S

SWPA3010S

SWPA8020S

Smaller and smaller

Thinner and thinner

Product LinesProduct Lines

SWPA5040SSWPA5020S

SWPA252012S

SWPA2016S（Developing）

SWPA4018S


Product LinesProduct Lines

0.64~6.300.82~3308.0*8.0[mm]SWPA80S

0.57~5.900.50~3306.0*6.0[mm]SWPA60S

0.49~4.451.0~1005.0*5.0[mm]SWPA50S

0.17~3.150.82~2204.0*4.0[mm]SWPA40S

0.21~2.10.82~1003.0*3.0[mm]SWPA30S

0.38~2.270.47~222.5*2.0[mm]SWPA252012S

Rated Current（A）

Inductance Range（uH）

Dimensions（L*W）

Series

Property Range Table


Application field

Self-resonant Frequency

Inductance

Rated Current

External Dimension

The following items should be noted when selecting power

inductors in design stage.

Power Inductor Selection GuidePower Inductor Selection Guide


Generally, smaller current is selected to set as rated current to suit the circuit.eg:SWPA6045S100M：

DCI1=3.20 ADCI2=2.45 A --->choose this current

Rated Current

The inductance will drop greatly when the loop current increases more than saturation current, and thus the peak value of current ripple cannot be suppressed due to low inductance, which may cause damage to IC.The body temperature of inductors may rise sharply when the loop current increases more than heat rating current, which may cause the worse reliability of wire insulation material and even destroy inductors.



The reference of selecting the power inductor size

LCD TV: low voltage and large current 6mm or above dimensionsPortable Products: DC-DC high frequency, low inductance, small and thin 3mm or 2.5mmDigital Camera: small and thin 3mm or bellowNote Book: for CPU, low inductance, ultra large current; for other parts, 6mm or above dimensionsHard Disk: 3mm-8mm are all used



Saturation Current: The larger saturation current promises, the greaterpower output capability.Inductance: The larger inductance promises, the smaller output ripple is.Frequency: SRF must satisfy the switch frequency characteristics. DC-resistance: The smaller DC resistance is, the smaller the efficiency loss.EMI: Choose shielded inductor to avoid electro-magnetic radiation leakage.PCB Dimension: Choose appropriate size power inductor according to available PCB space.

When used in DC-DC conversion circuit, the followings should be also considered.



7E SeriesNR SeriesDS\DB\D SeriesSLF\VLF\VLC\VLS SeriesCDRH SeriesSWPA Series

SAGAMITaiyoTOKOTDKSUMIDASUNLORD

Cross Part NumberCross Part Number


ApplicationApplicationSwitch Frequency

100kHz~MHzSwitch Frequency

100kHz~MHz

Switch Frequency

100kHz~MHz

EMI

Connect with other IC

① Function: Smoothing, Energy Storage, Phase extension

② Function: EMI suppression

Radiated noise

300MHz~1GHz


Thank You！

Documents

Wire Wound SMD Power Inductor SWPA Series