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TPS61087QDRCRQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS61087QDRCRQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page 2 - 0.35 IN S IN S out S V V V L V I f h æ ö æ ö æ ö = × × ç ÷ ç ÷ ç ÷ × è ø è ø è ø TPS61087-Q1 SLVSB50 – DECEMBER 2011 www.ti.com Inductor Selection The TPS61087-Q1 is designed to work with a wide range of inductors. The main parameter for the inductor selection is the saturation current of the inductor which should be higher than the peak switch current as calculated in the Design Procedure section with additional margin to cover for heavy load transients. An alternative, more conservative, is to choose an inductor with a saturation current at least as high as the maximum switch current limit of 4.8 A. The other important parameter is the inductor DC resistance. Usually the lower the DC resistance the higher the efficiency. It is important to note that the inductor DC resistance is not the only parameter determining the efficiency. Especially for a boost converter where the inductor is the energy storage element, the type and core material of the inductor influences the efficiency as well. At high switching frequencies of 1.2 MHz inductor core losses, proximity effects and skin effects become more important. Usually an inductor with a larger form factor gives higher efficiency. The efficiency difference between different inductors can vary between 2% to 10%. For the TPS61087-Q1, inductor values between 3 μH and 6 μH are a good choice with a switching frequency of 1.2 MHz, typically 3.3 μH. At 650 kHz we recommend inductors between 6 μH and 13 μH, typically 6.8 μH. Possible inductors are shown in Table 1. Typically, it is recommended that the inductor current ripple is below 35% of the average inductor current. Therefore, the following equation can be used to calculate the inductor value, L: (5) with VIN Minimum input voltage VS Output voltage Iout Maximum output current in the application fS Converter switching frequency (typically 1.2 MHz or 650 kHz) η Estimated converter efficiency (please use the number from the efficiency plots or 90% as an estimation) Table 1. Inductor Selection L COMPONENT SIZE DCR TYP SUPPLIER Isat (A) CODE ( μH) (L ×W×H mm) (m Ω) 1.2 MHz 4.2 Sumida CDRH5D28 5.7 × 5.7 × 3 23 2.2 4.7 Wurth Elektronik 7447785004 5.9 × 6.2 × 3.3 60 2.5 5 Coilcraft MSS7341 7.3 × 7.3 × 4.1 24 2.9 5 Sumida CDRH6D28 7 × 7 × 3 23 2.4 4.6 Sumida CDR7D28 7.6 × 7.6 × 3 38 3.15 4.7 Wurth Elektronik 7447789004 7.3 × 7.3 × 3.2 33 3.9 3.3 Wurth Elektronik 7447789003 7.3 × 7.3 × 3.2 30 4.2 650 kHz 10 Wurth Elektronik 744778910 7.3 × 7.3 × 3.2 51 2.2 10 Sumida CDRH8D28 8.3 × 8.3 × 3 36 2.7 6.8 Sumida CDRH6D26HPNP 7 × 7 × 2.8 52 2.9 6.2 Sumida CDRH8D58 8.3 × 8.3 × 6 25 3.3 10 Coilcraft DS3316P 12.95 × 9.40 × 80 3.5 5.08 10 Sumida CDRH8D43 8.3 × 8.3 × 4.5 29 4 6.8 Wurth Elektronik 74454068 12.7 × 10 × 4.9 55 4.1 10 Copyright © 2011, Texas Instruments Incorporated |
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