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FPQ2625 Datasheet(PDF) 4 Page - NEC |
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FPQ2625 Datasheet(HTML) 4 Page - NEC |
4 / 71 page ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9603FERVOL05E1001T0 12) Take note of the following information when selecting mem- bers (bobbin, metal fittings, tape, adhesives, saturants, and coat- ings) to use in combination with the ferrite core. 1 Members that do not corrode or react. 2 Members with coefficients of thermal expansion as close as possible to ferrite. 3 Members that do not add thermal shock (such as casting chemicals). 4 Members that can withstand transformer heat genera tion, and particularly those that do not were down wires. 13) The coefficients of thermal expansion for the ferrite core and bobbin differ greatly. Securing the core and bobbin with satu- rants and adhesives will cause the bobbin to expand from heating when the adhesive hardens or heat release during operation. This will place stress on the core, possibly causing it to break. Allow sufficient clearance between the core and bobbin. 14) When there is unbalance from a circuit being split two or more times, the flux will concentrate on the side where the flow is the easiest and may result in abnormal heating and even fire. 15) When a bifilar wiring is made by, for example, a wire con- tainer, and the wire gage and length is different or the number of coils are different, the electrical current will tend to flow in only the easiest way, resulting in heating and fire. 16) Designs should keep abnormal current resulting from a prob- lem in another circuit from flowing into the transformer. 17) When used as a transformer, heat will be released. Designs should ensure that surrounding parts will not deteriorate or be destroyed by that heat. 18) Regarding equipment where the user is able to touch the core, make sure to provide extensive warnings and instructions to the user so they will not get shocked or burned by touching the core. Precautions Before Use Notes on Design 1) When selecting the material and shape for the ferrite core, strictly observe the limits given in the catalog (product manual) regarding such things as the L value, maximum saturation, mag- netic flux density, and core loss. 2) Select a ferrite core having temperature and frequency proper- ties for the core loss that meet the demands of the equipment to be used. 3) Abnormal heat release may result if used under high frequen- cies or in strong magnetic fields. Select a ferrite core that has the appropriate properties such as a low core loss. 4) In an environment where the Curie point is exceeded, the fer- rite core may lose its intrinsic properties, causing the equipment to malfunction. Use only in a temperature range that stays below the Curie point. 5) Give careful consideration to the balance of the ferrite core's thickness when designing a shape. 6) When designing a bobbin, set measurements and select bob- bin materials that meet the requirements (frame class, thickness, HWI, HAI, HVTR, CTI, and D495) of safety standards such as UL. 7) Working on the coil could destroy the ferrite core owing to the coil's thickness or damage the coil itself, so designs should pro- vide adequate clearance between the core and coil. 8) For inserting the ferrite core into a case, designs should pro- vide adequate clearance between the core and case. The core may break unnecessary force is applied. 9) The insulation resistance of the ferrite core is not high. Do not use it as an insulator. Also, do not use it for other purposes (such as electrical circuit element). 10) For ferrite cores that have low resistivity such as Mn-Zn cores, make sure to provide sufficient insulation with insulation protection covers and tape, etc. 11) When resins such as adhesives, saturants, and coatings are used, excessive stress may arise in the ferrite core owing to the difference in coefficients of thermal expansion, resulting in the core breaking. It is best not to use such resins, but if their use cannot be avoided, use one with a coefficient of thermal expan- sion that is close to that of the core. In addition, select non-corro- sive resin for the core and members to be used. 19) Since leakage flux may cause equipment to malfunction, check in advance for its effects on the equipment you are using and ueardy equipment, and then take the appropriate actions. Ferrite Cores VOL.05 4 フェライトコア5版_E 10.1.23 13:24 ページ 4 |
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