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TPS62000-HT Datasheet(PDF) 16 Page - Texas Instruments |
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TPS62000-HT Datasheet(HTML) 16 Page - Texas Instruments |
16 / 22 page 2 O I L L O L(max) O(max) V 1 V I I = V I I L f - D D ´ = + ´ (4) OUTPUT CAPACITOR SELECTION 1 2 3 O O I RMS(C ) O V 1 V I = V L f - ´ ´ ´ ´ (5) O I O O O V 1 V 1 V = V ESR L 8 C f f - æ ö D ´ ´ + ç ÷ ´ ´ ´ è ø (6) TPS62000-HT SLVS917A – MARCH 2009 – REVISED JUNE 2009 .......................................................................................................................................................... www.ti.com Where: ƒ = Switching frequency (750 kHz typical) L = Inductor value ΔIL = Peak-to-peak inductor ripple current IL(max) = Maximum inductor current The highest inductor current occurs at maximum VI. A more conservative approach is to select the inductor current rating just for the maximum switch current of the TPS62000 which is 1.6 A with ILIM = VIN and 900 mA with ILIM = GND. See Table 1 for recommended inductors. Table 1. Tested Inductors(1) OUTPUT CURRENT INDUCTOR VALUE COMPONENT SUPPLIER COMMENTS Coilcraft DO3316P-103 Coilcraft DT3316P-103 High efficiency Sumida CDR63B-100 0 mA to 600 mA 10 µH Sumida CDRH5D28-100 Coilcraft DO1608C-103 Smallest solution Sumida CDRH4D28-100 Coilcraft DO1608C-103 High efficiency 0 mA to 300 mA 10 µH Murata LQH4C100K04 Smallest solution (1) Parts are valid for –40°C to 85°C. For best performance, a low ESR output capacitor is needed. At output voltages greater than 1.8 V, ceramic output capacitors can be used to show the best performance. Output voltages below 1.8 V require a larger output capacitor and ESR value to improve the performance and stability of the converter. Table 2. Capacitor Selection OUTPUT VOLTAGE RANGE OUTPUT CAPACITOR OUTPUT CAPACITOR ESR 1.8 V ≤ VI ≤ 5.5 V Co ≥ 10 µF ESR ≤ 120 mΩ 0.8 V ≤ VI < 1.8 V Co ≥ 47 µF ESR > 50 m Ω See Table 3 for recommended capacitors. If an output capacitor is selected with an ESR value ≤ 120 mΩ, its RMS ripple current rating always meets the application requirements. Just for completeness, the RMS ripple current is calculated as: The overall output ripple voltage is the sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charge and discharging the output capacitor: Where the highest output voltage ripple occurs at the highest input voltage VI. 16 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TPS62000-HT |
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