Inhibition of signal lines dedicated to beads, the power line frequency noise and interference peak, but also has the ability to absorb the static pulse. Beads are used to absorb the ultra-high frequency signal, as some RF circuits, PLL, oscillator circuits, including ultra-high frequency memory circuit (DDRSDRAM, RAMBUS, etc.) need to increase the power input part of the bead, and the inductor is an energy storage Components used in the LC oscillator circuit, the low-frequency filter circuit, the frequency range of its applications are rarely more than 50MHZ. Beads have a high resistivity and magnetic permeability, equivalent series resistance and inductance, but the resistance and inductance value varies with frequency.
A Y A G E O C O M P A N Y Gapped SMD beads for power inductors Introduction feature the state of the art power Features material 3C96. Depending on relative ripple current, switching frequencies Traditional power supply architectures up to 1 MHz are possible to realize • Very suitable for POL converter for PC’s are facing problems with the concept. latest generation of integrated circuits. compact geometries. Saturation rated Lower voltages and higher currents current goes up to 20 A and the dc • High switching frequency, up to 1 resistance is less than 1 mΩ. MHz. lead to increasing losses in supply lines and sensitivity to interference. On top These gapped beads are available in 2 • High current rating, up to 20 A. of this, fast microprocessors introduce sizes (1812 and 3512), packed in tape • Low dc resistance, less than 1 mΩ. high frequency transients which are on reel and they are SMD mountable. • Small size (1812 and 3512). Furthermore, they are lead-free and difﬁcult to regulate with a voltage • SMD mountable. regulator module (VRM) from a distant fully comply with the RoHS regulations on hazardous substances. • Lead-free / RoHS-compliant. main supply. The fundamental solution utilizes an intermediate voltage and distributed L M point of load (POL) converters. These current flow + + are small dc/dc converters, placed close to the load on the PCB. mosfet conducting FERROXCUBE now introduces gapped Vi D C Vo SMD beads, perfectly suitable for the POL concept. They are small inductors mosfet cut-off − − typically meant to serve as output inductor in buck / boost stages and Buck or down converter Technical capabilities General data ITEM SPECIFICATION strip copper (Cu), tin (Sn) plated material see website for lead-free info Pb Solderability IEC 60068-2-58, part 2, test Ta, method 1 Taping IEC 60286-3, EIA 481-1 and EIA 481- method 2 Parameters and type numbers GRADE L at 1 MHz (nH) Imax(1) (A) TYPE NUMBER Note 3C96 BDS 3/3/4.6 ; mass ≈ 0.15 g (2) 1. Imax is the saturation rated current. 50 ± 20 % 20 BDS3/3/4.6-3C96-A50 2. DC resistance < 0.6 mΩ. 3. DC resistance < 1.0 mΩ. 75 ± 20 % 15 BDS3/3/4.6-3C96-A75 3C96 BDS 4.6/3/8.9 ; mass ≈ 0.5 g (3) 100 ± 20 % 20 BDS4.6/3/8.9-3C96-A100 150 ± 20 % 20 BDS4.6/3/8.9-3C96-A150 SMD bead BDS3/3/4.6 SMD bead BDS4.6/3/8.9 4.6 ± 0.3 1.2 3.05 4.6 8.9 ± 0.35 1.1 min ± 0.15 ± 0.3 1.27 5 min 1.2 1.27 min ± 0.07 min ± 0.07 3 3 max max 0.2 ± 0.015 0.2 ± 0.015 Advantages of the material 3C96 for power inductors 3C96 - Material Characteristics CONDITIONS VALUE UNIT Our lowest loss general power µi 25 ºC, ≤ 10 kHz, 0.25 mT 2000 ± 20 % material 3C96 is an excellent choice to use in high-frequency output inductors. µa 100 ºC, 25 kHz, 200 mT ≈ 5500 With a small ripple only, it can work at B 25 ºC, 10 kHz, 1200 A/m ≈ 500 mT much higher switching frequency then 100 ºC, 10 kHz, 1200 A/m ≈ 440 it would as a transformer material, Pv 100 ºC, 100 kHz, 100 mT ≈ 40 kW/m3 preserving its higher saturation over 100 ºC, 100 kHz, 200 mT ≈ 300 real high-frequency transformer 100 ºC, 500 kHz, 50 mT ≈ 250 materials. The main characteristics are ρ DC, 25 ºC ≈5 Ωm given in the table, but for complete graphical information, see our Tc ≥ 240 ºC handbook or look on the website. density ≈ 4800 kg/m3
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