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LT1578-2.5 Datasheet(PDF) 11 Page - Linear Technology |
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LT1578-2.5 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 28 page  11 LT1578/LT1578-2.5 APPLICATIONS INFORMATION II VV V fL V PEAK OUT OUT IN OUT IN =+ − () ()( )( ) 2 VIN = Maximum input voltage f = Switching frequency, 200kHz 3. Decide if the design can tolerate an “open” core geom- etry like a rod or barrel, with high magnetic field radiation, or whether it needs a closed core like a toroid to prevent EMI problems. One would not want an open core next to a magnetic storage media, for instance! This is a tough decision because the rods or barrels are temptingly cheap and small and there are no helpful guidelines to calculate when the magnetic field radia- tion will be a problem. 4. Start shopping for an inductor (see representative surface mount units in Table 1) which meets the requirements of core shape, peak current (to avoid saturation), average current (to limit heating), and fault current (if the inductor gets too hot, wire insulation will melt and cause turn-to-turn shorts). Keep in mind that all good things like high efficiency, low profile, and high temperature operation will increase cost, sometimes dramatically. Get a quote on the cheapest unit first to calibrate yourself on price, then ask for what you really want. 5. After making an initial choice, consider the secondary things like output voltage ripple, second sourcing, etc. Use the experts in the Linear Technology’s applica- tions department if you feel uncertain about the final choice. They have experience with a wide range of inductor types and can tell you about the latest devel- opments in low profile, surface mounting, etc. Table 1 SERIES CORE VENDOR/ VALUE DC CORE RESIS- MATER- HEIGHT PART NO. ( µH) (Amps) TYPE TANCE(Ω) IAL (mm) Coiltronics CTX15-2 15 1.7 Tor 0.059 KM µ 6.0 CTX33-2 33 1.4 Tor 0.106 KM µ 6.0 CTX68-4 68 1.2 Tor 0.158 KM µ 6.4 CTX15-1P 15 1.4 Tor 0.087 52 4.2 CTX33-2P 33 1.3 Tor 0.126 52 6.0 CTX68-4P 68 1.1 Tor 0.238 52 6.4 Sumida CDRH74-150 15 1.47 SC 0.081 Fer 4.5 CDH115-330 33 1.68 SC 0.082 Fer 5.2 CDRH125-680 68 1.5 SC 0.12 Fer 6 CDH74-330 33 1.45 SC 0.17 Fer 5.2 Coilcraft DO3308P-153 15 2 SC 0.12 Fer 3 DO3316P-333 33 2 SC 0.1 Fer 5.21 DO3316P-683 68 1.4 SC 0.18 Fer 5.21 Pulse PE-53602 35 1.4 Tor 0.166 Fer 9.1 PE-53604 73 1.3 Tor 0.290 Fer 9.1 PE-53632 22 2.7 Tor 0.063 Fer 9.1 PE-53633 40 2.7 Tor 0.085 Fer 10 Gowanda SMP3316-152K 15 3.5 SC 0.041 Fer 6 SMP3316-332K 33 2.3 SC 0.092 Fer 6 SMP3316-682K 68 1.7 SC 0.178 Fer 6 Tor = Toroid SC = Semi-closed geometry Fer = Ferrite core material 52 = Type 52 powdered iron core material KM µ = Kool Mµ |
Similar Part No. - LT1578-2.5_15 |
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Similar Description - LT1578-2.5_15 |
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