SRV3914EE

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Document overview

• Manufacturer or author: TDK Corporation
• PDF pages: 24

Technical content

LLC Resonance Power Transformers 1JOUFSNJOBMUZQF SRX/SRV series SRX43EM (Through hole) SRX25EM (Through hole) SRX30ER-ᶗ (Through hole) SRX30ER-ᶘ (Through hole) SRX35ER (Through hole) SRX48EM (Through hole) SRX40ER (Through hole) SRV3914EE (Through hole) SRV4214EE (Through hole) SRV4215ES (Through hole) SRV4715ER (Through hole)

(2/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. An attention matter on use Please read this specifications before using this product by all means. An attention matter on security I undertake use with this product, and it is paid attention enough, and please design an attention matter safely. When you designs a base of an electric circuit. Please use size of the hole or pad which we recommend. Magnetic flux to leak out occurs. Please confirm it about influence of magnetic flux beforehand. There is fear to cause false movement of machinery. In a design of a base of an electric circuit, Please consider the next contents. In an applied safe standard. The trans and distance with other parts The product is not quakeproof structure. Accordingly please do not add vibration and a shock to it. There is fear to lose a function. Please do not use it when you let a product drop. The product produces possibility to lose a function Please pay attention to the pin which had it pointed keenly. There is danger to injure. Please avoid the next place. The place that receives a drop of water, trash, the dust, foggy influence. The place where direct rays of the sun hits. There is fear to cause false movement of machinery. Please prohibit safekeeping and use at the next place. Environment to be accompanied with gas corrosion, salt, acid, alkali. There is fear to lose a function. When you carry the product on a base of an electric circuit. Please do not use a metal tool. Because impossible power is added to a product. There is fear to lose a function. I considered the next matter, and we designed a product. Safe standard and power supply voltage and circuit drive condition, drive frequency and Duty ON-TIME. By those conditions, we decided structure and the turns number. Please avoid use in designed condition outside. There are destruction of a circuit part and fear of ignition. This product considered a characteristic of a component and a self temperature rise, and it was made. We select range of humidity as use temperature already. Please avoid use by range more than this. There are the damage and fear of ignition. Please avoid use in the environment next. The environment that trash and the dust stick to a product. There is fear to cause a fire. The products listed on this specification sheet are intended for use in general electronic equipment (AV equipment, telecommunications equipment, home appliances, amusement equipment, computer equipment, personal equipment, office equipment, measurement equipment, industrial robots) under a normal operation and use condition. The products are not designed or warranted to meet the requirements of the applications listed below, whose performance and/or quality require a more stringent level of safety or reliability, or whose failure, malfunction or trouble could cause serious damage to society, person or property. If you intend to use the products in the applications listed below or if you have special requirements exceeding the range or conditions set forth in this catalog, please contact us. (1) Aerospace/Aviation equipment (2)Transportation equipment (cars, electric trains, ships, etc.) (3) Medical equipment (4) Power-generation control equipment (5) Atomic energy-related equipment (6) Seabed equipmentapplications (7) Transportation control equipment (8) Public information-processing equipment (9) Military equipment (10) Electric heating apparatus, burning equipment (11) Disaster prevention/crime prevention equipment (12) Safety equipment (13) Other applications that are not considered general-purpose

applications

When designing your equipment even for general-purpose applications, you are kindly requested to take into consideration securing protection circuit/device or providing backup circuits in your equipment. Attention on a design Attention on the handling Attention

(3/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm LLC Resonance Power Transformers SRX/SRV series Contents Page

• All specifications are subject to change without notice.

(4/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm LLC Resonance Power Transformers Pin terminal type Compliant with worldwide safety standards, this is a small and thin transformer with the advantages of effective use of low-los s ferrite material. MATERIAL Optimized materials and core shapes have been developed. The necessary power can be transmitted with a small number of turns. While optimizing materials, TDK has further improved its proprietary core shape to develop a new-type core. The transformer has been downsized considerably, and its temperature increase has also been curbed. MANUFACTURING METHOD Since the SRX/SRV Series supports automatic winding, the product is of a high quality and can be manufactured stably. It is designed to support automatic winding, which enables a remarkable reduction in the loss generated to achieve a proficient in manual winding until stable production. In addition, the characteristic variations of the winding wire and creepage tape have largely been removed, stabilizing the transformer's characteristics. OPTIMIZATION DESIGN Using design tools developed with TDK’s comprehensive know-how, high-precision design has been achieved in a short period of time. 1) For optimization design and high-quality stable production, customers can use a specification request form. 2)TDK recommends design with a standard core gap (AL-value) for optimization and shorter trial and mass production lead time. Design is simple as each shape retains its GAP , AL-value, and K parameters beforehand. ENVIRONMENT The SRX/SRV series is RoHS directive-compliant product. Development Concept of the SRX/SRV Series

(5/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. LLC Resonance Power Transformers Pin terminal type TDK now provides characteristically thin resonance LLC resonance power transformers. In order to develop these transformers, TDK made effective use of low loss performance (which is a feature of the PC47 family), optimized the structure of the core and the bobbin, and utilized its proprietary automatic winding industrial method.

FEATURES

A low height (15 to 31.5mm in height) is achieved. Large power is achieved in a small shape. The automatic winding industrial method is adopted. Product compatible with RoHS directive. APPLICATION AV equipment, digital home appliance PART NUMBER CONSTRUCTION Overview of the SRX/SRV Series Series name Core shape Input voltage code Output voltage code Internal code Product compatible with RoHS directive Compatible with lead-free solders RoHS Directive Compliant Product: See the following for more details.https://product.tdk.com/info/en/environment/rohs/index.html

(6/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. Overview of the SRX/SRV Series

ELECTRICAL CHARACTERISTICS

Horizontal type (general) Vertical type (shielded) Type Mount method HeightH (mm) Frequency (kHz)min. Maximum output power (W)max. Number of outputs Depth D (mm) Width W (mm) Lead space F (mm) Number of pins(pieces) Primary side Secondary side Horizontal type SRX43EM Through hole 15 100 180 2 55 46 37.5 5 7 SRX25EM Through hole 20 100 100 2 47.6 36.1 32 5 6 SRX30ER-ᶗ Through hole 27 100 180 2 57 41.5 40 6 6 SRX30ER-ᶘ Through hole 25 100 180 3 52 45.5 35 8 8 SRX35ER Through hole 25 80 250 3 55 53 35 6 9 SRX48EM Through hole 25 60 300 3 58 51 35 6 8 SRX40ER Through hole 31.5 60 300 3 54 43 35 8 8 Vertical type SRV3914EE Through hole 15 100 160 2 64 43.5 64 4 8 SRV4214EE Through hole 15 100 200 2 64 43.5 64 4 8 SRV4215ES Through hole 16 100 200 2 64 49 44 6 9 SRV4715ER Through hole 16 100 250 2 64 52 44 6 9 H W D H W D

(7/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. Product Lineup Horizontal type (general) Vertical type (shielded) 10050 150 200 250 400 30Height from substrate(mm) Power(W) 300 350 : Vertical type (shielded) : Horizontal type (general) SRX43EM SRX25EM SRX35ER SRX30ER SRX40ER SRV4214EE/4215ES SRV4715ER SRX48EM SRV3914EE

(8/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRX series SRX43EM Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 46max. 1.8 15max. 4 55max. 3.519.5 37.5 6 12-ø1.0 Dimensions in mm 5.5 21.3 37.5 12-ø1.6 PCB cut Dimensions in mm 12345 12 11 10 9 8 7 6 666 6 66666 6

(9/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRX series SRX25EM Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 768 9 10 11 32(7.8)( 7.8) 47.6max. 12345 36.1max. 20max. 3.5 11-ø1.0 Dimensions in mm 11-ø1.6 Dimensions in mm 12345 11 10 9 8 7 6 5.5 5.5 5.5 5.5 5575 5

(10/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRX series SRX30ER-ᶗ, SRX30ER-ᶘ Type SHAPE & DIMENSIONS SRX30ER-ᶗ SRX30ER-ᶘ RECOMMENDED BASE MATERIAL OPENING SIZE SRX30ER-ᶗ SRX30ER-ᶘ 41.5max. 27max. 71 2 57max. 40 (7.75)(9.25) 66666 66 9 66 12-ø1.0 Dimensions in mm 45.5max. 25max. 91 6 52max. 5555 5 55 5555 5 55 16-ø0.8 (9.84)( 7.16) Dimensions in mm 6 6 6 6 669 6 6 12-ø1.6 123 456 7 8 9 10 12 11 Dimensions in mm 8 7 6 5213 4 9 10 11 1215 16 14 13 Dimensions in mm 5 55555 5 5 55555 5 16-ø1.3

(11/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRX series SRX35ER Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 55max. 25max. 43 5(9) (11) 37max. 53max. 15-ø1.0 Dimensions in mm 5 5 55 2.5 2.5 35.0 15-ø1.6 Dimensions in mm 5 5556 66 6

(12/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRX series SRX48EM Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 51max. 25max. 4 58max. 35.0 14-ø1.0 Dimensions in mm 14 7 6 6 6 6 666 6 Dimensions in mm35.0 3 3 14-ø1.6

(13/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRX series SRX40ER Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 54max. 31.5max. 4 43max. 16-ø1.0 Dimensions in mm 5 5 5 5 5 5 555 55 5 2.5 2.5 2.5 2.5 35.0 16-ø1.6 Dimensions in mm

(14/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRV seriesɹ SRV3914EE Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 43.5max. 3.515max. Dimensions in mm 1 2 3 4 6 789 10 11 12 12- 0.8 Dimensions in mm 12-ø1.6 1 2 3 4 56 7 8 9 10 1112 99 6

(15/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRV series SRV4214EE Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 43.5max. 3.515max. Dimensions in mm 1 2 3 4 6 789 10 11 12 12- 0.8 Dimensions in mm 12-ø1.6 1 2 3 4 56 7 8 9 10 1112 99 6

(16/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRV series SRV4215ES Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE 49max. 12 11 10 9 8 12 3 45 6 4.016max. 44(10.0)( 10.0) 64max. 15- 0.8 Dimensions in mm 1315 14 Dimensions in mm 15-ø1.6 1 2 3 45 6 78 9 10 11 12 1314 15 8855 12.6 555 555 6 5

(17/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. SRV series SRV4715ER Type SHAPE & DIMENSIONS RECOMMENDED BASE MATERIAL OPENING SIZE Dimensions in mm52max. 12 11 10 9 8 12 3 45 6 4.016max. 44(10.0)( 10.0) 64max. 15- 0.8 131514 Dimensions in mm 15-ø1.6 1 2 3 45 6 78 9 10 11 12 1314 15 8855 12.6 555 555 6 5

(20/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. Figure 6 Example of temperature dependence of core loss EXAMPLE OF TRANSFORMER DESIGN The following is an example of transformer design. First, the specifications as a power supply is as follows: Vin=350V to 405V,

390 Vtyp, Vo=24V, Io=8A, FR=1 (critical mode) at around SW

frequency 100kHz. As for other parameters: V F=0.65V, k=0.9, Q=3, EER32 core (Ae=86.5 mm2) VF: drop voltage of the rectifier diode 1. Setting the operation point Voltage conversion rate M at the operation point is calculated. Since FR=1 here, the following formula is used. When the operation point is changed, the value is calculated using Formula (1). 2. Turn ratio n is determined from input voltage Vin and 3. AC equivalent resistance Rac is calculated based on the maximum load condition. 4. From the fact that Rac is the characteristic impedance Zo multiplied by Q, the value of Zo is determined (the Q value is set based on referring to Figure 7. This value is dependent on coupling coefficient k). It is recommended that the value of Q be set to 3 or larger. It is set to 3 here. The Q value affects the number of turns. 5. Calculation of Cr (resonance capacity) and L LK (resonant inductance) The values of LLK and Cr are determined from the Zo value calculated in the above process and the resonant frequency. 6. Calculation of the primary inductance Lp and the number of turns of the transformer In an EER32 core, AL=386nH/n2 when k=0.9 (this is a parameter determined by the transformer shape). The first calculation is now complete. Adjustment will be performed after this. The values after the decimal point will first be rounded off since they cannot be wound. It is better for Ns with a smaller number of turns to be close to an integer. The graph of Figure 4 (frequency-output voltage characteristic) is created to confirm the characteristic, and the core flux density is estimated using the Formula (2). The following points should be considered: ˓Whether sufficient output can be obtained at the maximum/ minimum input voltage and under the maximum/minimum load condition. ˓If the flux density does not exceed 200mT. The flux density should be 250mT or smaller in a low-loss material. ˓Confirmation of the operation point For graph creation, the calculation is performed directly by using the formula of voltage conversion rate M or by using the AC analysis of the circuit simulator. It is recommended that the AC analysis graph be checked using one of these methods. If problems are observed from the graph, calculation is performed again after modifying the design conditions. To be specific, Q and k (= Gap) will be adjusted. Particularly, when the voltage range or load condition is broad, it may be necessary to repeat this process several times to achieve the optimum conditions. M (FR=1) = 1 k Rac= 8  n 2  RL= 8 8.792 ZO = Rac 0.0 1.0 2.0 3.0 4.0 5.0 20 40 60 80 100 120 Ambient temperature Ta(˚C) Core loss Pc(W) Common material Sample: EER30 type Low-loss material 100kHz, Bm=200mT (ΔB=400mT) ZO = fO = From Cr = 1 = 1 = 25.41 [nF]2  Z0f2 62.63100kHz LLK = Z0 Lp = LLK Np == = 36.87 Ns = Np = 37 = 4.21n8 . 7 9 LLK Cr LLK • Cr2π Lp AL 524.7 0.386

(22/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. Figure 10 Core GAP vs. AL/k characteristic example of split windings (calculation value) a) GAP vs. LLKper turn b) GAP vs. AL/k The number of turns is determined to some extent by the restrictions imposed by the magnetic flux density or output voltage ratio. Once the number of turns is determined, the leakage inductance becomes constant for the most part and cannot be changed by a large degree (for example, approximately 75nH/n for SRX35). This is a significant difference from the case in which a resonant inductor is externally attached. When it is desired that the number of turns be changed, a winding method that does not use split windings can be used. However, this method is not recommended due to disadvantages in terms of production and cost. WINDINGS Since windings are formed using leakage flux alongside a large amount of AC component, strand wire is used to reduce loss by the skin effect or eddy current loss. Wire with a 0.1mm diameter or less is commonly used. Aside from normal strand wire, USTC wire that is covered by fiber is used. When this type of wire is used, windings do not become loose and adverse effects from winding collapse can be prevented. TRANSIENT ANALYSIS BY A CIRCUIT SIMULATOR Once the parameters are determined, it is recommended that transient analysis be performed using a circuit simulator, as it allows for accurate calculation of the transformer voltage and current as well as to check for any design errors. It is convenient to include the output voltage control function. The following is the calculation results of the sample design performed here. Figure 11 Simulation resul Vin=390V Vo=24V Io=8A Primary current: 1.27Ap '(199mT) SW frequency: 100.5kHz Primary current: 1.45A Secondary current: 6.48A Figure 12 Simulation model The frequency is almost exactly as designed. The operation waveforms are close to sine waves, and the operation point is at FR=1, as designed. From the current values, the necessary wire cross-sectional area can be estimated. 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 AL(μH/N2) AL(μH/N2) GAP(mm) GAP(mm) 0.70 0.75 0.80 0.85 0.90 0.95 1.00 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 K SRX35

3 I(Cr) I(Lm)

I(R10) I(R11) Excitation current Primary current Secondary current D1 R3 20m Cr 27n R11 25m 25m 210 Lm n n LrLr Lr2Lr1 80m 200p 200p Vinv Vo V V File Vin 390 10m 1000 RC1 Vo*Vo/Po F max.=120k F min.=80k Td=150n Vo=24 Po=192 Lm=425.4u Lr=47.17u n=8.75 Rset=5 ∗((Vo-2.5)/2.5)

(23/23) TRANSFORMERS 20191007 / trans_ac_dc-converter_srx_srv_en.fm Please be sure to request delivery specifications that provide further details on the features and specifications of the products for proper and safe use. Please note that the contents may change without any prior notice due to reasons such as upgrading. REMINDERS ˓About multi-output transformers The number of turns on the secondary side may only be a few turns in the design of a multi-output transformer. Even in such a case, multi-output is possible; however, it is difficult to output voltage that does not correspond to the turn ratio of the secondary side. For example, when the winding is optimally designed with 4Ts at Vo=24V, the second output can only achieve 24/ 4=6V step voltage. ˓About multi-transformer configuration When one transformer cannot achieve the necessary power due to shape restrictions, etc., combining multiple transformers with the same shape enables the required power to be achieved. Contact us for more details on the transformer design method for each wire connection method. ˓About the impact of leakage flux A common problem with thin resonant transformers is that, when the transformer has a structure in which metal plates, etc., are arranged close to each other on the upper and lower sides during operation, leakage flux generated from the transformer crosses through the metal and eddy current loss occurs. This may cause the metal plates or the transformer to generate heat. In such a case, it may become necessary to take measures such as redesigning the structure or providing magnetic shields, etc.

1. Department, applicant's name 1. Company name Address TEL/FAX Name: E-mail LLC Resonance Power Transformer Specification Request Form Issued on 3. Input specifications Frequency (Hz) Minimum operating input voltage: (Hz) AC input voltage: Rated Operating range:(V) to (V) (V) to (V) DC input voltage: Rated Operating range:(V) to (V) (V) to (V) 4. Design condition to (kHz)(1) Clock frequency Lowest frequency to Highest frequency (V) to (mA)Desired voltage value and current Condition in temperature evaluation (ex.: minimum input, rated load) ϶T (ˆ)(6) Maximum temperature rise (ˆ) to (ˆ)(5) Operating temperature range (%)(4) Overcurrent point condition (ex.: 130% of the rated output power in (3) above) (W) / (W)(3) Rated output power/Maximum peak power (8) Circuit diagram (If you desire any pin number, attach a circuit diagram.) Yesɹɹɹɹɹɹ No Necessity of insulation Functional insulationɹ Reinforced insulation Number of windings (Windings) (7) Auxiliary winding Yesɹɹɹɹɹɹ No (2) Secondary-side output voltage (A) to (A)(A) to(V) ʶ (V) Min. Typ. Max. (V) ʶ (V) (A) to (A)(A) to (V) ʶ (V) (A) to (A)(A) to 5. Inductance value for reference 6. Desired core size and external size 10. IC expected to be used 11. Production quantity information 12. Sample information 13. If there are any other requests (priorities in the company, size or price, etc.) or alterable items, please provide a description. Desired price/Currency:Final set name: Product No.:Manufacturer name: Core size: External size L: W: H(Height from the board): mm max. Primary-side self-inductance: µ(H) Leakage inductance: µ(H) Prototyping time: (MP1)(PP2)(PP1)(ES2)(ES1) Production place:Production start period:Production volume: k/M Requested delivery time:Required sample quantity pcs. 8. Safety distance (Please enter the distance prescribed by the company.) 9. Withstand voltage (Please enter the voltage prescribed by the company.) Secondary - secondary: AC (V) (min) (mA) Primary - secondary: AC (V) (min) (mA) AC (V) (min) (mA)Primary - core: Primary - primary: AC (V) (min) (mA) AC (V) (min) (mA)Secondary - core: Primary - secondary: mm or greater Primary - primary: mm or greater Primary - core: mm or greater Secondary - secondary: mm or greater Secondary - core: mm or greater Application for the transformer Yes∗ Set purchase No (∗ Please bear in mind that the application fee may be borne by the customer.) Pollution degree 1 2 3 (If not specified, design will be performed with a pollution degree of 2.) Insulation type Basic insulation Reinforced insulation Double insulation Other ( ) 7. Safety standard compliance Electrical Appliances and Material Safety Act, Appendix 8 Others CSA IEC UL Prototype No: Person in Charge from Sales Dep.: Person in Charge from Sales Promotion Dep.: Recorded Date Recorded Date Recorded Date TDK Corporation 2-5-1 Nihonbashi, Chuo-ku, Tokyo, 103-6128, Japan Magnetics BG Tel: 81-3-6778-1034 Electronic Component Sales & Marketing Group Tel: 81-3-6778-1014