Datasheet LT3590 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 48V Buck Mode LED Driver in SC70 and 2mm × 2mm DFN |
| 页数 / 页 | 16 / 8 — APPLICATIONS INFORMATION. Inductor Selection. Capacitor Selection. Table … |
| 文件格式/大小 | PDF / 237 Kb |
| 文件语言 | 英语 |
APPLICATIONS INFORMATION. Inductor Selection. Capacitor Selection. Table 1. Inductor Manufacturers. INDUCTANCE. RANGE (μH). PART
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LT3590
APPLICATIONS INFORMATION Inductor Selection Capacitor Selection
A 220μH inductor is recommended for most LT3590 ap- The small size of ceramic capacitors make them ideal plications with VIN < 25V and 470μH is recommended for for LT3590 applications. X5R and X7R types are recom- applications with VIN > 25V. Although small size and high mended because they retain their capacitance over wider effi ciency are major concerns, the inductor should have voltage and temperature ranges than other types such as low core losses at 850kHz and low DCR (copper wire Y5V or Z5U. A 1μF input capacitor and a 0.1μF regulator resistance). Several manufacturers and inductor series capacitor are suffi cient for most applications. For the that meet these criteria are listed in Table 1. The effi ciency output capacitor, 1μF is generally recommended, but if comparison of different inductors is shown in Figure 3. the voltage across the capacitor exceeds 10V, a 0.47μF
Table 1. Inductor Manufacturers
capacitor may be used instead. For applications driving one or two LEDs a 2.2μF output capacitor is needed.
INDUCTANCE RANGE (μH)
Table 2 shows a list of several ceramic capacitor manufac-
PART (RELEVANT TO DIMENSIONS VENDOR SERIES THIS PART) (mm)
turers. Consult the manufacturers for detailed information Coilcraft DO1605 100 TO 680 5.4 × 4.2 × 1.8 on their entire selection of ceramic parts. www.coilcraft.com LPS4012 100 TO 680 4.0 × 4.0 × 1.2 LPS3010 100 TO 330 3.0 × 3.0 × 0.9
Table 2: Recommended Ceramic Capacitor Manufacturers
1812FS 100 TO 680 Taiyo Yuden (408) 573-4150 MSS5131 100 TO 390 5.1 × 5.1 × 3.1 www.t-yuden.com Sumida CDC4D20 100 TO 680 4.8 × 4.8 × 2.0 AVX (803) 448-9411 www.sumida.com www.avxcorp.com Toko LLQ1608 100 TO 270 Murata (714) 852-2001 www.tokoam.com LLQ2012 100 TO 680 www.murata.com Würth Elektronik WE-PD2 100 TO 220 5.2 × 5.8 × 4.5 Kemet (408) 986-0424 www.we-online.com TYPE M www.kemet.com WE-PD2 100 to 470 7.0 × 7.8 × 5.0 TYPE L Coiltronics CTX32C 100 to 330 2.5 × 3.2 × 2.2 www.cooperet.com Murata LQH32M 100 to 560 3.2 × 2.5 × 2.0 www.murata.com LQH43M 100 to 680 4.5 × 3.2 × 2.0 92 TDK SLF70145-471MR22-PF VIN = 48V MURATA QH32CN471K23 10 LEDs MURATA LQH43CN471K03 FRONT PAGE COILCRAFT LP06013-474KLB 90 APPLICATION COILCRAFT 1008PS-474KLB CIRCUIT COILCRAFT LPS4012-474ML 88 EFFICIENCY (%) 86 84 0 10 20 30 40 50 LED CURRENT (mA) 3590 F03
Figure 3. Effi ciency Comparison of Different Inductors
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APPLICATIONS INFORMATION Inductor Selection Capacitor Selection
A 220μH inductor is recommended for most LT3590 ap- The small size of ceramic capacitors make them ideal plications with VIN < 25V and 470μH is recommended for for LT3590 applications. X5R and X7R types are recom- applications with VIN > 25V. Although small size and high mended because they retain their capacitance over wider effi ciency are major concerns, the inductor should have voltage and temperature ranges than other types such as low core losses at 850kHz and low DCR (copper wire Y5V or Z5U. A 1μF input capacitor and a 0.1μF regulator resistance). Several manufacturers and inductor series capacitor are suffi cient for most applications. For the that meet these criteria are listed in Table 1. The effi ciency output capacitor, 1μF is generally recommended, but if comparison of different inductors is shown in Figure 3. the voltage across the capacitor exceeds 10V, a 0.47μF
Table 1. Inductor Manufacturers
capacitor may be used instead. For applications driving one or two LEDs a 2.2μF output capacitor is needed.
INDUCTANCE RANGE (μH)
Table 2 shows a list of several ceramic capacitor manufac-
PART (RELEVANT TO DIMENSIONS VENDOR SERIES THIS PART) (mm)
turers. Consult the manufacturers for detailed information Coilcraft DO1605 100 TO 680 5.4 × 4.2 × 1.8 on their entire selection of ceramic parts. www.coilcraft.com LPS4012 100 TO 680 4.0 × 4.0 × 1.2 LPS3010 100 TO 330 3.0 × 3.0 × 0.9
Table 2: Recommended Ceramic Capacitor Manufacturers
1812FS 100 TO 680 Taiyo Yuden (408) 573-4150 MSS5131 100 TO 390 5.1 × 5.1 × 3.1 www.t-yuden.com Sumida CDC4D20 100 TO 680 4.8 × 4.8 × 2.0 AVX (803) 448-9411 www.sumida.com www.avxcorp.com Toko LLQ1608 100 TO 270 Murata (714) 852-2001 www.tokoam.com LLQ2012 100 TO 680 www.murata.com Würth Elektronik WE-PD2 100 TO 220 5.2 × 5.8 × 4.5 Kemet (408) 986-0424 www.we-online.com TYPE M www.kemet.com WE-PD2 100 to 470 7.0 × 7.8 × 5.0 TYPE L Coiltronics CTX32C 100 to 330 2.5 × 3.2 × 2.2 www.cooperet.com Murata LQH32M 100 to 560 3.2 × 2.5 × 2.0 www.murata.com LQH43M 100 to 680 4.5 × 3.2 × 2.0 92 TDK SLF70145-471MR22-PF VIN = 48V MURATA QH32CN471K23 10 LEDs MURATA LQH43CN471K03 FRONT PAGE COILCRAFT LP06013-474KLB 90 APPLICATION COILCRAFT 1008PS-474KLB CIRCUIT COILCRAFT LPS4012-474ML 88 EFFICIENCY (%) 86 84 0 10 20 30 40 50 LED CURRENT (mA) 3590 F03
Figure 3. Effi ciency Comparison of Different Inductors
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