LB4X2X8U

TM 1．Noise Suppression Devices AMOBEADS TM An amorphous noise suppression device is unique and completely different from conventional noise filters. Conventional noise prevention products focus on somehow minimizing the noise after it's been created, by typically trying to absorb the noise, and so their effectiveness in noise reduction is directly influenced by frequency of the circuit. Amorphous noise suppressing devices, on the other hand, focus on the source of the noise and work to prevent or minimize the noise before it has a chance to develop. The source of the electronic circuit noise is the rapid change of current or voltage, and the effectiveness of the amorphous cores in eliminating this noise is independent of frequency. An amorphous noise suppression device is a product that takes full advantage of the unique magnetic characteristics of the cobalt based amorphous alloy. Toshiba Materials offers two noise suppression devices, "AMOBEADSTM " and "SPIKE KILLERSTM ". AMOBEADSTM " deliver excellent noise suppression results and are convenient to use by simply being slipped over the leads of the semiconductor device. "AMOBEADSTM " are also available with a lead thru and in a surface mount configuration. "SPIKE KILLERSTM ", which are larger in size than "AMOBEADSTM ", most often are wire wound and are effective in eliminating or minimizing higher noise levels. C Noise Suppression Device R AB RC Snubber Magnetic Snubber Basic Snubber Circuit Diagram B[T] 0.6 Amorphous 0.4 Ferrite 0.2 -80 -40 0 -0.2 40 80 H [A/m] -0.4 -0.6 （100 kHz, RT） B-H Curve（typical） Example for Noise Suppressing Effect (Chopper Converter) With an excellent saturable characteristic, "AMOBEADSTM " suppress the reverse recovery current of the diode and decrease the noise that is occurring. When the current for diode reverses and tries to go into the recovery condition, the "AMOBEADSTM " displays a large inductance and oppose the generation of the recovery current. In this instance, a soft recovery is possible for core material with a smaller coercive force. Output Noise Diode Current １A/div With AMOBEADSTM (AB4×2×8W) Without Countermeasure - 8 - − 4 − AB／LB Series RoHS compliant products Standard Specifications AMOBEADSTM　 W series Finished Dimensions [mm] O.D. max I. D. min H.T. max 4.0 1.5 4.5 Type No. AB3X2X3W Core Size [mm]＊1 O.D. I. D. H.T. 3.0 2.0 3.0 Total Flux＊2 φc[μWb] min 0.9 AL value＊3 L[μH] min 3.0 AB3X2X4.5W 4.0 1.5 6.0 3.0 2.0 4.5 1.3 5.0 AB4X2X4.5W 5.0 1.5 6.0 4.0 2.0 4.5 2.7 9.0 AB4X2X6W 5.0 1.5 7.5 4.0 2.0 6.0 3.6 12.0 AB4X2X8W 5.0 1.5 9.5 4.0 2.0 8.0 4.8 16.0 DY series (low price) Type No. Packing Unit PBT case Blue 2,000 [pcs/box] （Recommend for big demand, 10,000pcs/lot ) Finished Dimensions [mm] Total Flux*7 φc[μWb] Insulating Cover 4.0±0.2 4.0±0.2 4.0±0.2 5.0+0.2/-0.3 5.95±0.2 0.9min 0.9min 1.3min 3.6min 0.45min PBT PBT PBT PBT PBT O.D. AB2.8X4.5DY AB3X2X3DY AB3X2X4.5DY AB4X2X6DY AB5X4X3DY Insulating Cover H.T. 5.7±0.3 4.2±0.3 5.7±0.3 7.2±0.3 4.2±0.3 Packing Unit [pcs/bag］ Black Black Gray Black Black 10,000 10,000 10,000 5,000 5,000 ※Inner diameter can pass through a 1.2Ｘ0.7mm lead. However, Inner diameter of AB5x4x3DY can pass through a 2.5x0.7 mm lead. W series DY sereis AMOBEADSTM with lead Bulk type Finished Dimensions [mm] Type No. *4 *2 B *3 Current Total flux AL Value Insulating Packing Unit Cover [A] φc[μWb] L[μH] B D E F LB4X2X8F 16.0max 4.2±0.5 14.0±1.0 φ1.25±0.1 （8.0） LB4X2X8U 20.0max 4.0±0.5 5.0±1.0 φ1.25±0.1 4.8 　 min 16.0 min B F PBT case 1,000 Black [pcs/box] D E LB4X2X8F Radial taping ａ Type No. P [mm] Po [mm] LB2.8X4.5U 12.7 Do [mm] a [mm] 12.7 φ4.0 9.0max d [mm] Current＊4 I [A] φ0.8 (5) Total Flux＊7 Packing φc[μWb] Unit 0.9min D0 P0 Finished Dimensions [mm] Lead width length height width x thickness ＊4 ＊2 Io [A] Total Flux φc[μWb] ＊3 AL value Insulating Cover L[μH] AB3X2X3SM 5.0±0.3 5.0±0.3 4.0±0.3 (1.8×0.35) （6.0） 0.9 min 3.0 AB4X2X6SM 6.0±0.3 8.0±0.3 5.0±0.3 (1.8×0.52) （9.0） 3.6 min 12.0 Packing Unit [pcs/reel] 2,000 LCP case Black 1,000 Recommended Land Pattern (mm) 2.4 H L W 2.0 9.4 AB3X2X3SM ＊1 Reference Value ＊2 Minimum Guarantee on Measuring Condition : 50kHz、80A/m(sine wave), R.T. ＊3 Measuring Condition：50kHz, 1V, 1turn, R.T. ＊4 Typical Value, using a cross section of lead ＊5 Measuring Condition：100kHz, 80A/m （sine wave), R.T. ＊6 Tolerance ±0.2［mm］ ＊7 Converted from Inductance Value L1 at 1kHz、 100mA(sine wave)、R.T. 　　φｃ(μWb)＝0.282 x L1(μＨ) TM ☆"AMOBEADS " sample kits are available. Please ask sales department. TM TM ☆"AMOBEADS " and "SPIKE KILLER " : Registered trademarks of TOSHIBA MATERIALS Co., Ltd. TM TM ☆"AMOBEADS " and "SPIKE KILLER " : Resistered in U.S.A., France, Germany, U.K., Japan. - 9 - − 5 − 2.4 3.3 14.7 AB4X2X6SM F LB4X2X8U P ｄ 3,000 [pcs/box] SMD Type AMOBEADSTM　 Type No. D E Examples of Applied Circuits and their Characteristics Application of Amorphous Noise Suppression Devices AB M AB AB Chopper Converter Control Circuit for Motor AB AB AB M AB Flyback Converter AB AB Motor Driving Circuit AB 100 Forward Converter AB AB4×2×8W AB4×2×6W AB4×2×4.5W AL value ［μＨ] 10 AB AB3×2×6W AB3×2×4.5W 1 AB2.8×4.5DY AB3×2×3W Push-pull Converter Characteristics (Typical value) 1k 100k Frequency f [Hz] 1M 100 φ(t)/φ(25℃) Pfe [kW/m3］ 1000 100 500kH z 300kH z 50 200kH z 100kH z Typical value R.T. Sine Wave 50kH z 1 0.01 10k Frequency Characteristics of Inductance 10000 10 Typical Value R.T. 0.1 0.1 0. 1 0 ΔB | [T] 20 40 60 80 100 120 Temperature [℃] Flux(φ) Decline Ratio vs. Temperature Coreloss Characteristic [AMOBEADSTM ] - 10 - − 6 − TM Effects of Noise Suppression by AMOBEADS TM Spike Voltage Suppression Without Countermeasure Spike voltage can be reduced and ringing phenomena can also be prevented by AMOBEADS. Also Schottky barrier diode (SBD) can be protected from over voltage. Diode Voltage VD 10V/div Frequency：500kHz Output Voltage - Current ：5Ｖ-20Ａ Output Noise Reduction AMOBEADSTM "AB4×2×4.5Ｗ" Diode Current ID 5A/div AMOBEADSTM "AB4×2×4.5Ｗ" RC Snubber +Ferrite Beads When the ferrite is replaced by AMOBEADS at the secondary output diode (FRD) of the forward converter circuit, the output noise can be tremendously reduced, not only the noise peak level but also the amplitude range. Output Noise VN 20mv/div Frequency：150kHz Output Voltage - Current ：15Ｖ-10Ａ Ferrite Beads 4×2×4 AMOBEADSTM "AB4×2×4.5Ｗ" Primary Surge Voltage MOS-FET Drain-Source Voltage VDS 200V/div When the ferrite is replaced by AMOBEADS at the secondary output diode (SBD) of the forward converter circuit, the output noise and harmful influence to the primary stage can be reduced. These effects are based on the inclination of the actual BH curves between amorphous and ferrite materials. Frequency：250kHz Output Voltage - Current ：5Ｖ-15Ａ Output Noise VN 50mv/div Output Noise B H Actual BH Curve BH characteristics of Ferrite - 11 - − 7 − BH characteristics of Amobeads