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LTC1877 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1877 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTC3621/LTC3621-2 11 3621f For more information www.linear.com/LTC3621 applicaTions inForMaTion produce the most improvement. Percent efficiency can be expressed as: % Efficiency = 100% – (L1 + L2 + L3 +…) where L1, L2, etc. are the individual losses as a percent- age of input power. Although all dissipative elements in the circuit produce losses, three main sources usually account for most of the losses in LTC3621 circuits: 1) I2R losses, 2) switching and biasing losses, 3) other losses. 1. I2R losses are calculated from the DC resistances of the internal switches, RSW, and external inductor, RL. In continuous mode, the average output current flows through inductor L but is “chopped” between the internal top and bottom power MOSFETs. Thus, the series resistance looking into the SW pin is a function of both top and bottom MOSFET RDS(ON) and the duty cycle (DC) as follows: RSW = (RDS(ON)TOP)(DC) + (RDS(ON)BOT)(1 – DC) TheRDS(ON)forboththetopandbottomMOSFETscanbe obtained from the Typical Performance Characteristics curves. Thus to obtain I2R losses: I2R losses = IOUT2(RSW + RL) Table 1. Inductor Selection Table INDUCTOR INDUCTANCE (µH) DCR (mΩ) MAX CURRENT (A) DIMENSIONS (mm) HEIGHT (mm) MANUFACTURER IHLP-1616BZ-11 Series 1.0 2.2 4.7 24 61 95 4.5 3.25 1.7 4.3 × 4.7 4.3 × 4.7 4.3 × 4.7 2 2 2 Vishay www.vishay.com IHLP-2020BZ-01 Series 1 2.2 3.3 4.7 5.6 6.8 18.9 45.6 79.2 108 113 139 7 4.2 3.3 2.8 2.5 2.4 5.4 × 5.7 5.4 × 5.7 5.4 × 5.7 5.4 × 5.7 5.4 × 5.7 5.4 × 5.7 2 2 2 2 2 2 FDV0620 Series 1 2.2 3.3 4.7 18 37 51 68 5.7 4 3.2 2.8 6.7 × 7.4 6.7 × 7.4 6.7 × 7.4 6.7 × 7.4 2 2 2 2 Toko www.toko.com MPLC0525L Series 1 1.5 2.2 16 24 40 6.4 5.2 4.1 6.2 × 5.4 6.2 × 5.4 6.2 × 5.4 2.5 2.5 2.5 NEC/Tokin www.nec-tokin.com HCP0703 Series 1 1.5 2.2 3.3 4.7 6.8 8.2 9 14 18 28 37 54 64 11 9 8 6 5.5 4.5 4 7 × 7.3 7 × 7.3 7 × 7.3 7 × 7.3 7 × 7.3 7 × 7.3 7 × 7.3 3 3 3 3 3 3 3 Cooper Bussmann www.cooperbussmann.com RLF7030 Series 1 1.5 2.2 3.3 4.7 6.8 8.8 9.6 12 20 31 45 6.4 6.1 5.4 4.1 3.4 2.8 6.9 × 7.3 6.9 × 7.3 6.9 × 7.3 6.9 × 7.3 6.9 × 7.3 6.9 × 7.3 3.2 3.2 3.2 3.2 3.2 3.2 TDK www.tdk.com WE-TPC 4828 Series 1.2 1.8 2.2 2.7 3.3 3.9 4.7 17 20 23 27 30 47 52 3.1 2.7 2.5 2.35 2.15 1.72 1.55 4.8 × 4.8 4.8 × 4.8 4.8 × 4.8 4.8 × 4.8 4.8 × 4.8 4.8 × 4.8 4.8 × 4.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 Würth Elektronik www.we-online.com |
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Similar Description - LTC1877 |
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