FERROXCUBE DATA SHEET 3R1 Material specification Supersedes data of September 2004 2008 Sep 01 Ferroxcube Material specification 3R1 3R1 SPECIFICATIONS MnZn ferrite with a nearly rectangular hysteresis loop for use in magnetic regulators/amplifiers. SYMBOL µi B Br Hc ρ TC density CONDITIONS 25 °C; ≤10 kHz; 0.25 mT 25 °C; 10 kHz; 1200 A/m 100 °C; 10 kHz; 1200 A/m from 1 kA/m; 25 °C from 1 kA/m; 100 °C from 1 kA/m; 25 °C from 1 kA/m; 100 °C DC; 25 °C VALUE UNIT 10 3 µ's mT µ''s ≈ 340 ≥ 310 10 2 mT ≥ 220 ≤ 52 10 10 1 A/m 1 10 10 2 f (MHz) ≤ 23 ≈ 103 ≥ 230 ≈ 4700 Ωm °C kg/m3 Fig.1 MBW062 5000 handbook, halfpage Complex permeability as a function of frequency. MBW018 500 25oC 100oC handbook, halfpage 3R1 µi B (mT) 4000 400 3000 300 2000 200 1000 100 0 50 3R1 µ's , µ''s 800 ±20% ≈ 410 MBW061 10 4 handbook, halfpage 3R1 0 50 Fig.2 2008 Sep 01 150 T ( o C) 250 50 0 50 100 500 1000 H (A/m) Initial permeability as a function of temperature. Fig.3 Typical B-H loops. 200 Ferroxcube Material specification 3R1 MBW001 10 4 handbook, halfpage Pv MBW002 800 handbook, halfpage 3R1 1 MHz 3R1 Pv (kW/m 3 ) 400 kHz (kW/m 3) 100 kHz f B (kHz) (mT) 600 10 3 100 100 30 200 10 200 25 kHz 400 10 kHz 10 2 200 10 1 10 10 2 B (mT) 10 0 3 0 Fig.5 Fig.4 Specific power loss as a function of peak flux density with frequency as a parameter. Remark: When 3R1 ring cores are driven exactly at their natural mechanical resonant frequencies a magneto-elastic resonance will occur. With large flux excursions and no mechanical damping, amplitudes can become so high that the maximum tensile stress of the ferrite is exceeded. Cracks or even breakage of the ring core could be the result. It is advised not to drive the toroidal cores at their radial resonant frequencies or even subharmonics (e.g. half this resonant frequency). Resonant frequencies can be calculated for any ring core with the following simple formula: 5700 fr = ---------------------------- kHz D o + D i π ----------------- 2 where: f = radial resonant frequency (kHz) Do = outside diameter (mm) Di = inside diameter (mm). 2008 Sep 01 201 40 80 120 T (o C) Specific power loss for several frequency/flux density combinations as a function of temperature. Ferroxcube Material specification 3R1 DATA SHEET STATUS DEFINITIONS DATA SHEET STATUS PRODUCT STATUS DEFINITIONS Preliminary specification Development This data sheet contains preliminary data. Ferroxcube reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. Product specification Production This data sheet contains final specifications. Ferroxcube reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. DISCLAIMER Life support applications These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Ferroxcube customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Ferroxcube for any damages resulting from such application. PRODUCT STATUS DEFINITIONS STATUS INDICATION DEFINITION Prototype These are products that have been made as development samples for the purposes of technical evaluation only. The data for these types is provisional and is subject to change. Design-in These products are recommended for new designs. Preferred These products are recommended for use in current designs and are available via our sales channels. Support These products are not recommended for new designs and may not be available through all of our sales channels. Customers are advised to check for availability. 2008 Sep 01 202