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3598 Datasheet(PDF) 9 Page - Linear Technology |
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3598 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 20 page  LT3598 9 3598f Inductor Selection Table 1 lists several inductors that work well with the LT3598, however, there are many other manufacturers and devices that can be used. Consult each manufacturer for detailed information on their entire range of parts. Ferrite core inductors should be used to obtain the best efficiency. Choose an inductor that can handle the necessary peak current without saturating. Also, ensure that the inductor has a low DCR (copper wire resistance) to minimize I2R power losses. Values between 4.7μH and 22μH will suffice for most applications. Inductor manufacturers specify the maximum current rating as the current where inductance falls by a given percentage of its nominal value. An inductor can pass a current greater than its rated value without damaging it. Consult each manufacturer to determine how the maximum inductor current is measured and how much more current the inductor can reliably conduct. Table 1. Recommended Inductors PART L (μH) MAX DCR (Ω) CURRENT RATING (A) VENDOR B1015AS-100M #817FY-4R7M 1123AS-4R7M 10 4.7 4.7 0.07 0.06 0.12 2.2 2.26 1.90 TOKO www.toko.com 74454068 74454010 7447745100 6.8 10 10 0.055 0.065 0.12 2.2 2 1.7 Würth Electronics www.we-online.com CDH74NP-120L CDH74NP-150L CDRH6D38-100 12 15 10 0.065 0.083 0.038 2.45 2.10 2.00 Sumida www.sumida.com IHLP-2525BD-01 10 0.129 2.5 Vishay www.vishay.com SD25-4R7-R 4.7 0.056 1.83 Cooper www.cooperet.com LPS4018-472ML 4.7 0.200 1.8 Coilcraft www.coilcraft.com Capacitor Selection Low ESR (equivalent series resistance) ceramic capaci- tors should be used at the output to minimize the output ripple voltage. Use only X5R or X7R dielectrics, as these materials retain their capacitance over wider voltage and APPLICATIONS INFORMATION temperature ranges than other dielectrics. A 4.7μF to 10μF output capacitor is sufficient for most high output current designs. Table 2 lists some suggested manufacturers. Consult the manufacturers for detailed information on their entire selection of ceramic parts. Table 2. Recommended Ceramic Capacitor Manufacturers Taiyo Yuden 408-573-4150 www.t-yuden.com AVX 843-448-9411 www.avxcorp.com Murata 770-436-1300 www.murata.com Kemet 408-986-0424 www.kemet.com United Chemi-Con 847-696-2000 www.chemi-con.com Diode Selection Schottky diodes, with their low forward voltage drop and fast switching speed, must be used for all LT3598 applica- tions. Do not use P-N diodes. Table 3 lists several Schottky diodes that work well. The diode’s average current rating must exceed the application’s average output current. The diode’s maximum reverse voltage must exceed the application’s output voltage. A 2A diode is sufficient for most designs. For PWM dimming applications, be aware of the reverse leakage current of the diode. Lower leakage current will drain the output capacitor less, allowing for higher dimming range. The companies below offer Schottky diodes with high voltage and current ratings. Table 3. Suggested Diodes PART MAX CURRENT (A) MAX REVERSE VOLTAGE (V) MANUFACTURER B250A B240A SBR140S3 SBM340, PDS340 2 2 1 3 50 40 40 40 Diodes, Inc. www.diodes.com HSM150G HSM150J 1 1 50 50 Microsemi www.microsemi.com SS3H9 3 90 Vishay www.vishay.com |
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