Ferrites and accessories - TDK Electronics

1 EPCOS AG 2017. Reproduction, publication and dissemination of this publication, enclosures hereto and theinformation contained therein without EPCOS prior express consent is AG is a TDK Group Company. Ferrites and accessoriesSIFERRIT material N87 Date:September 201729/17 Please read Cautions and warnings and Important notes at the end of this propertiesPreferred applicationPower transformersMaterialN87 Base materialMnZnSymbolUnitInitial permeability(T = 25 C)Pi2200r25% flux density (H = 1200 A/m, f = 10 kHz)BS (25 C)BS (100 C)mTmT490390 Coercive field strength(f = 10 kHz)Hc (25 C)Hc (100 C)A/mA/m2113 Optimumfrequency rangefminfmaxkHzkHz25500 Hysteresismaterial constantKB10 6/mT < temperatureTC C>210 Mean value of DFat 25.

2 55 C10 6/K4 density (typical values)kg/m34850 Relative core losses(typical values)PV25 kHz, 200 mT, 100 CkW/m357100 kHz, 200 mT, 100 CkW/m3375300 kHz, 100 mT, 100 CkW/m3390500 kHz, 50 mT, 100 CkW/m3215 ResistivityU:m10 Core shapesRM, P, PM, ETD, EFD, E, ER, EP, EQ, ELP, U,ToroidN87 SIFERRIT materials39/17 Please read Cautions and warnings and Important notes at the end of this data for N87 SIFERRIT materialsComplex permeabilityversus frequency(measured on R34 toroids, mT)Amplitude permeabilityversus AC field flux density (measured on R34 toroids, mT)Initial permeability Piversus temperature(measured on R34 toroids, mT)BBB49/17 Please read Cautions and warnings and Important notes at the end of this materialsDynamic magnetization curves(typical values)(f = 10 kHz, T = 25 C)

3 DC magnetic biasof P, RM, PM and E cores( mT, f = 10 kHz, T = 25 C)Dynamic magnetization curves(typical values)(f = 10 kHz, T = 100 C)DC magnetic biasof P, RM, PM and E cores( mT, f = 10 kHz, T = 100 C)BB59/17 Please read Cautions and warnings and Important notes at the end of this materialsRelative core lossesversus AC field flux density (measured on R34 toroids)Relative core lossesversus frequency(measured on R34 toroids)Relative core lossesversus temperature(measured on R34 toroids)69/17 Please read Cautions and warnings and Important notes at the end of this stress and mountingFerrite cores have to meet mechanical requirements during assembling and for a growing numberof applications.

4 Since Ferrites are ceramic materials one has to be aware of the special behaviorunder mechanical valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast tempera-ture changing or tensile load. Especially high cooling rates under ultrasonic cleaning and high staticor cyclic loads can cause cracks or failure of the ferrite detailed information see data book, chapter General - Definitions, .Effects of core combination on AL value Stresses in the core affect not only the mechanical but also the magnetic properties. It is apparentthat the initial permeability is dependent on the stress state of the core.

5 The higher the stresses arein the core, the lower is the value for the initial permeability. Thus the embedding medium shouldhave the greatest possible detailed information see data book, chapter General - Definitions, .Heating upFerrites can run hot during operation at higher flux densities and higher The magnetic properties of NiZn-materials can change irreversible in high magnetic AccessoriesEPCOS ferrite accessories have been designed and evaluated only in combination with EPCOS ferrite cores. EPCOS explicitly points out that EPCOS ferrite accessories or EPCOS ferrite coresmay not be compatible with those of other manufacturers.

6 Any such combination requires prior te-sting by the customer and will be at the customer s own assumes no warranty or reliability for the combination of EPCOS ferrite accessories withcores and other accessories from any other remarksThe start of the winding process should be soft. Else the flanges may be destroyed. Too strong winding forces may blast the flanges or squeeze the tube that the cores can not be mounted any more. Too long soldering time at high temperature (>300 C) may effect coplanarity or pin arrange-ment. Not following the processing notes for soldering of the J-leg terminals may cause solderability problems at the transformer because of pollution with Sn oxyde of the tin bath or burned insula-tion of the wire.

7 For detailed information see chapter Processing notes , section The dimensions of the hole arrangement have fixed values and should be understood asa recommendation for drilling the printed circuit board. For dimensioning the pins, the groupof holes can only be seen under certain conditions, as they fit into the given hole avoid problems when mounting the transformer, the manufacturing tolerances for positioning the customers drilling process must be considered by increasing the hole and warningsFerrites and accessoriesCautions and warnings79/17 Please read Cautions and warnings and Important notes at the end of this and accessoriesDisplay of ordering codes for EPCOS productsThe ordering code for one and the same product can be represented differently in data sheets, data books.

8 Other publications and the website of EPCOS, or in order-related documents such asshipping notes, order confirmations and product labels. The varying representations of the ordering codes are due to different processes employed and do not affect the specifications of the respective products. Detailed information can be found on the Internet under and warnings89/17 Please read Cautions and warnings and Important notes at the end of this 'BB 'B BDCBRBSC0 CDFDFdEaffcutofffmaxfminfrfCugHH HDCHchh/Pi2 IIDCI Jkk3k3cLCross section of coilEffective magnetic cross sectionInductance factor; AL = L/N2 Minimum inductance at defined high saturation ( Pa)Minimum core cross sectionWinding cross sectionResistance factor.

9 AR = RCu/N2 RMS value of magnetic flux densityFlux density deviationPeak value of magnetic flux densityPeak value of flux density deviationDC magnetic flux densityRemanent flux densitySaturation magnetizationWinding capacitanceCore distortion factorRelative disaccommodation coefficient DF = d/PiDisaccommodation coefficientActivation energyFrequencyCut-off frequencyUpper frequency limitLower frequency limitResonance frequencyCopper filling factorAir gapRMS value of magnetic field strengthPeak value of magnetic field strengthDC field strengthCoercive field strengthHysteresis coefficient of materialRelative hysteresis coefficientRMS value of currentDirect currentPeak value of currentPolarizationBoltzmann constantThird harmonic distortionCircuit third harmonic distortionInductancemm2mm2nHnHmm2mm2P: = 10 6.

10 Vs/m2, mTVs/m2, mTVs/m2, mTVs/m2, mTVs/m2, mTVs/m2, mTVs/m2, mTF = As/ Vmm 1, Hzs 1, Hzs 1, Hzs 1, Hzs 1, HzmmA/mA/mA/mA/m10 6 cm/A10 6 cm/AAAAVs/m2J/KH = Vs/ASymbols and termsFerrites and accessoriesSymbols and terms99/17 Please read Cautions and warnings and Important notes at the end of this 'L/LL0 LHLpLrevLslelNNPCuPtransPVPFQRRCuRh'RhRi RpRsRthRVsT'TTCttvtan Gtan GLtan Grtan Getan Ghtan G/PiU VeZZnRelative inductance changeInductance of coil without coreMain inductanceParallel inductanceReversible inductanceSeries inductanceEffective magnetic path lengthAverage length of turnNumber of turnsCopper (winding)