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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ML4812 Datenblatt(PDF) 11 Page - Fairchild Semiconductor |
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ML4812 Datenblatt(HTML) 11 Page - Fairchild Semiconductor |
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11 / 16 page  ML4812 REV. 1.0 10/10/2000 11 TYPICAL APPLICATIONS (Continued) MAGNETICS TIPS L1 — Main Inductor As shown in Table 1, one of several toroidal cores can be used for L1. The T184-40 core above is the most economical, but has lower inductance at high current. This would yield higher ripple current and require more line EMI filtering. The value for RSC (slope compensation resistor on RAMP COMP) was calculated for the T225-8/ 90 and should be recalculated for other inductor characteristics. The various core manufacturers have a range of applications literature available. A gapped ferrite core can also be used in place of the powdered iron core. One such core is a Philips Components (Ferroxcube) core #4229PL00-3C8. This is an ungapped core. Using 145 turns of #24 AWG wire, a total air gap of 0.180" is required to give a total inductance of about 2mH. Since 1/2 of the gap will be on the outside of the core and 1/2 the gap on the inside, putting a 0.09" spacer in the center will yield a 0.180" total gap. To prevent leakage fields from generating RFI, a shorted turn of copper tape should be wrapped around the gap as shown in Figure 11. For production, a gapped center leg can be ordered from most core vendors, eliminating the need for the external shorted copper turn when using a potentiometer core. COPPER FOIL SHORTED TURN 0.09" GAP Figure 11. Copper Foil Shorted Turn MATERIAL MANUFACTURER PART # TURNS (#24AWG) Powdered Iron Micrometals T225-8/90 200 Powdered Iron Micrometals T184-40 120 Molypermalloy SPANG (Mag. Inc.) 58076-A2 (high flux) 180 Table 1. Toroidal Cores (L1) T1 — Sense Transformer In addition to the core type mentioned in the parts list, the following Siemens cores should be suitable for substitution and may be more readily available in Europe. MATERIAL SIZE CODE PART # N27 R16/6.3 B64290-K45-X27 N30 R16/6.3 B64290-K45-X830 The N27 material is for high frequency and will work better above 100KHz but both are adequate. In addition, Philips Components (Ferroxcube) core 768T188-3C8 can be used. Please also refer to the list of core vendors below SPANG/Magnetics Inc. 1 (800) 245-3984, or (412) 282-8282 Micrometals 1 (800) 356-5977 Philips Components (914) 247-2064 |
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