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LT3754 Datasheet(PDF) 11 Page - Linear Technology |
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LT3754 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 24 page  LT3597 11 3597f Inductor Selection Inductor values between 100µH and 470µH are recom- mended for most applications. It is important to choose an inductor that can handle the peak current without saturating. The inductor DCR (copper wire resistance) must also be low in order to minimize I2R power losses. Table 1 lists several recommended inductors. Table 1. Recommended Inductors PART L (µH) DCR (Ω) CURRENT RATING (A) VENDOR LPS6225 MSS1038 MSS1038 MSS1038 100 100 220 470 0.61 0.3 0.76 1.24 0.52 1.46 0.99 0.70 Coilcraft www.coilcraft.com CDRH105R CDRW105R CDRH105R CDR6D28MN 100 220 470 100 0.253 0.50 1.29 0.9 1.35 0.94 0.60 0.75 Sumida www.sumida.com DS1262C2 DS1262C2 DS1262C2 100 220 470 0.17 0.35 1.243 1.5 1.0 0.7 Toko www.toko.com SLF10145T SLF10145T 100 220 0.26 0.47 1.0 0.7 TDK www.tdk.com DR73 DR73 100 220 0.527 1.05 0.79 0.53 Coiltronics www.cooperet.com Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used at the outputs to minimize output ripple voltage. Use only X5R or X7R dielectrics, as these materials retain their capacitance over wider voltage and temperature ranges than other dielectrics. Table 2 lists some suggested manufacturers. Consult the manufacturers for detailed information on their entire selection of ceramic surface mount parts. Table 2. Recommended Ceramic Capacitor Manufacturers Taiyo Yuden www.t-yuden.com AVX www.avxcorp.com Murata www.murata.com Kemet www.kemet.com TDK www.tdk.com APPLICATIONS INFORMATION Typically10µFcapacitorsaresufficientfortheVINandBIAS pins.Theoutputcapacitorforthebuckregulatorsdepends on the number of LEDs and switching frequency. Refer to Table 3 for the proper output capacitor selection. Table 3. Recommended Output Capacitor Values (VLED = 3.5V) SWITCHING FREQUENCY (kHz) # LEDS COUT (µF) 1000 1-3 3.3 >3 2.2 500 1-3 4.7 >3 3.3 200 1-3 15 >3 6.8 Diode Selection Schottky diodes, with their low forward voltage drop and fast switching speed, must be used for all LT3597 ap- plications. Do not use P-N junction diodes. The diode’s average current rating must exceed the application’s aver- age current. The diode’s maximum reverse voltage must exceed the application’s input voltage. Table 4 lists some recommended Schottky diodes. Table 4. Recommended Diodes PART MAX CURRENT (A) MAX REVERSE VOLTAGE (V) MANUFACTURER DFLS160 B160 1 1 60 60 Diodes, Inc. www.diodes.com CMMSH1-60 1 60 Central www.centralsemi.com ESIPB 1 100 Vishay www.vishay.com |
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