Wire Wound SMD Power inductor SWPA Series. High Performance Space- and Power-saving Innovative Low Cost Technology Full Automatic Process

Transcription

1 Wire Wound SMD Power inductor SWPA Series High Performance Space- and Power-saving Innovative Low Cost Technology Full Automatic Process

2 Outline SWPA Series 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

3 Conception Application for power lines always called power inductors Uses Semiconductor power supply circuits DC-DC switch circuits Functions Noise suppression Rectification Smoothing Inductors/Coils for signal lines Electrical signal Transmission circuits Filtering Resonation Impedance matching

4 Unique Compact Component Structure 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!

5 Unique Compact Component Structure Resin Ferrite Grain 电线 Wire 磁芯 Ferrite Core 磁环 Ring Core Air Gap 气隙 Air Cap SWPA: The air gaps between magnetic powders formed uniform and multiple. Conventional: The air gap between magnetic ring and core formed single and big.

6 Large Saturation Current Multiple air caps of SWPA Series Single air cap of Sleeve Type 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.

7 Features 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 damagefree durability Closed magnetic circuit design reduces leakage flux and Electro Magnetic Interference (EMI)

8 High Performance, Space & Power Savings SWPA6045S100M VS Conventional Structure 10μH(equal size) 10% 0% -10% L/L -20% -30% -40% -50% -60% SWPA6045S100M Conventional Structure 10μH(equal size) -70% Current (A) Higher Saturation Current than conventional inductors of the same size

9 Process Flow Metal electrodes Winding Gluing Drying H D D Sorting and Packing Drying Printing Soldering

10 Full Automatic Production Technologies For the same output, compared with conventional process, Innovative process saves 80% labor force and 50% manufacture space Products have higher quality and reliability as automatic process minimizes differences among operators Automatic Process Conventional Process

11 Main Electrical Parameters L: inductance DCR: DC resistance DCI1: DC overlap current DCI2: temperature rise current SRF: self-resonance frequency

12 L (inductance): Main Electrical Parameters 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 1 mh = 10-3 H 1 µh = 10-6 H 1 nh = 10-9 H Number K L M N Inductance tolerance ±10% ±15% ±20% ±30%

13 Main Electrical Parameters 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.

14 Main Electrical Parameters DCI1(Saturation Current) Saturation Current DCI2(Heat Rating Current) Heat Rating Current 30% DC-current DCI1 DC-current The inductance will decrease under continual current. The Saturation Current is defined as the current at which the inductance drops by 30%. 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.

15 Main Electrical Parameters 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. L:ideal inductance R:DC-Resistance Equivalent Circuit Cd:Stray capacitance Stray capacitance exist between wires and electrodes

16 Ordering information SWPA 6045 S 100 M T Type SWPA Wire Wound SMD 2 External Dimension (L/W H) (mm) X Feature Type S standard product 5 Inductance tolerance M ±20% N ±30% 4 Nominal Inductance Example Norminal value 1R0 1.0uH uH uH 6 packing T Tape Carrier Package

17 Product Lines Smaller and smaller Thinner and thinner SWPA8040S SWPA8020S SWPA6045S SWPA6028S SWPA6020S SWPA6012S SWPA5040S SWPA5020S SWPA252012S SWPA2016S (Developing) SWPA4030S SWPA4020S SWPA4018S SWPA4012S SWPA3015S SWPA3012S SWPA3010S

18 Product Lines Property Range Table Series Dimensions (L*W) Inductance Range (uh) Rated Current (A) SWPA252012S 2.5*2.0[mm] 0.47~ ~2.27 SWPA30S 3.0*3.0[mm] 0.82~ ~2.1 SWPA40S 4.0*4.0[mm] 0.82~ ~3.15 SWPA50S 5.0*5.0[mm] 1.0~ ~4.45 SWPA60S 6.0*6.0[mm] 0.50~ ~5.90 SWPA80S 8.0*8.0[mm] 0.82~ ~6.30

19 Selection Guide The following items should be noted when selecting power inductors in design stage. Application field Self-resonant Frequency Inductance Rated Current External Dimension

20 Selection Guide 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. Generally, smaller current is selected to set as rated current to suit the circuit. eg:swpa6045s100m: DCI1=3.20 A DCI2=2.45 A --->choose this current

21 Selection Guide The reference of selecting the power inductor size LCD TV: low voltage and large current 6mm or above dimensions Portable Products: DC-DC high frequency, low inductance, small and thin 3mm or 2.5mm Digital Camera: small and thin 3mm or bellow Note Book: for CPU, low inductance, ultra large current; for other parts, 6mm or above dimensions Hard Disk: 3mm-8mm are all used

22 Selection Guide When used in DC-DC conversion circuit, the followings should be also considered. Saturation Current: The larger saturation current promises, the greater power 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.

23 Cross Part Number SUNLORD SUMIDA TDK TOKO Taiyo SAGAMI SWPA Series CDRH Series SLF\VLF\VLC\VLS Series DS\DB\D Series NR Series 7E Series

24 Application Switch Frequency 100kHz~MHz Switch Frequency 100kHz~MHz Switch Frequency 100kHz~MHz 1 Function: Smoothing, Energy Storage, Phase extension EMI Radiated noise 300MHz~1GHz 2 Function: EMI suppression Connect with other IC

25 Thank You!