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LT1372 Datasheet(PDF) 11 Page - Linear Technology |
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LT1372 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 24 page  11 LT1506 APPLICATIONS INFORMATION Table 2 SERIES CORE VENDOR/ VALUE DC CORE RESIS- MATER- HEIGHT PART NO. ( µH) (Amps) TYPE TANCE(Ω) IAL (mm) Coiltronics CTX2-1 2 4.1 Tor 0.011 KM µ 4.2 CTX5-4 5 4.4 Tor 0.019 KM µ 6.4 CTX8-4 8 3.5 Tor 0.020 KM µ 6.4 CTX2-1P 2 3.4 Tor 0.014 52 4.2 CTX2-3P 2 4.6 Tor 0.012 52 4.8 CTX5-4P 5 3.3 Tor 0.027 52 6.4 Sumida CDRH125 10 4.0 SC 0.025 Fer 6 CDRH125 12 3.5 SC 0.027 Fer 6 CDRH125 15 3.3 SC 0.030 Fer 6 CDRH125 18 3.0 SC 0.034 Fer 6 Coilcraft DT3316-222 2.2 5 SC 0.035 Fer 5.1 DT3316-332 3.3 5 SC 0.040 Fer 5.1 DT3316-472 4.7 3 SC 0.045 Fer 5.1 Pulse PE-53650 4 4.8 Tor 0.017 Fer 9.1 PE-53651 5 5.4 Tor 0.018 Fer 9.1 PE-53652 9 5.5 Tor 0.022 Fer 10 PE-53653 16 5.1 Tor 0.032 Fer 10 Dale IHSM-4825 2.7 5.1 Open 0.034 Fer 5.6 IHSM-4825 4.7 4.0 Open 0.047 Fer 5.6 IHSM-5832 10 4.3 Open 0.053 Fer 7.1 IHSM-5832 15 3.5 Open 0.078 Fer 7.1 IHSM-7832 22 3.8 Open 0.054 Fer 7.1 Tor = Toroid SC = Semiclosed geometry Fer = Ferrite core material 52 = Type 52 powdered iron core material KM µ = Kool Mµ Output Capacitor The output capacitor is normally chosen by its Effective Series Resistance (ESR), because this is what determines output ripple voltage. At 500kHz, any polarized capacitor is essentially resistive. To get low ESR takes volume, so physically smaller capacitors have high ESR. The ESR range for typical LT1506 applications is 0.05 Ω to 0.2Ω. A typical output capacitor is an AVX type TPS, 100 µF at 10V, with a guaranteed ESR less than 0.1 Ω. This is a “D” size surface mount solid tantalum capacitor. TPS capacitors are specially constructed and tested for low ESR, so they give the lowest ESR for a given volume. The value in microfarads is not particularly critical, and values from 22 µF to greater than 500µF work well, but you cannot cheat mother nature on ESR. If you find a tiny 22 µF solid tantalum capacitor, it will have high ESR, and output ripple voltage will be terrible. Table 3 shows some typical solid tantalum surface mount capacitors. Table 3. Surface Mount Solid Tantalum Capacitor ESR and Ripple Current E Case Size ESR (Max., Ω) Ripple Current (A) AVX TPS, Sprague 593D 0.1 to 0.3 0.7 to 1.1 AVX TAJ 0.7 to 0.9 0.4 D Case Size AVX TPS, Sprague 593D 0.1 to 0.3 0.7 to 1.1 C Case Size AVX TPS 0.2 (typ) 0.5 (typ) Many engineers have heard that solid tantalum capacitors are prone to failure if they undergo high surge currents. This is historically true, and type TPS capacitors are specially tested for surge capability, but surge ruggedness is not a critical issue with the output capacitor. Solid tantalum capacitors fail during very high turn-on surges, which do not occur at the output of regulators. High discharge surges, such as when the regulator output is dead shorted, do not harm the capacitors. Unlike the input capacitor, RMS ripple current in the output capacitor is normally low enough that ripple cur- rent rating is not an issue. The current waveform is triangular with a typical value of 200mARMS. The formula to calculate this is: Output Capacitor Ripple Current (RMS): I VV V Lf V RIPPLE RMS OUT IN OUT IN ( ) = () − () ()( )( ) 029 . |
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