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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658620ZQZT датащи(PDF) 92 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 92 Page - Texas Instruments |
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92 / 104 page  4 APPLICATION INFORMATION 4.1 DC/DC CONVERTER OUTPUT FILTER 4.1.1 Inductor Selection L L Lmax outmax Vout 1 I Vin I = Vout I = I + L 2 - D D ´ ´ ¦ (4-1) 4.1.2 Output Capacitor Selection TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com The typical value for the converter inductor is 2.2 µH output inductor. Larger or smaller inductor values can be used to optimize the performance of the device for specific operation conditions. The selected inductor has to be rated for its DC resistance and saturation current. The DC resistance of the inductance will influence directly the efficiency of the converter. Therefore an inductor with lowest DC resistance should be selected for highest efficiency. See document SLVA157 for more information on inductor selection. Equation 4-1 calculates the maximum inductor current under static load conditions. The saturation current of the inductor should be rated higher than the maximum inductor current as calculated with Equation 4-1. This is recommended because during heavy load transient the inductor current will rise above the calculated value. with: f = Switching Frequency (2.25MHz typical) L = Inductor Value ΔIL= Peak to Peak inductor ripple current ILmax = Maximum Inductor current The highest inductor current will occur at maximum Vin. Open core inductors have a soft saturation characteristic and they can usually handle higher inductor currents versus a comparable shielded inductor. A more conservative approach is to select the inductor current rating just for the maximum switch current of the corresponding converter. It must be considered, that the core material from inductor to inductor differs and will have an impact on the efficiency especially at high switching frequencies. Refer to Table 4-1 and the typical applications for possible inductors. Table 4-1. Inductors SUPPLY INDUCTOR TYPE INDUCTANCE SUPPLIER TYP DIMENSIONS [ µH] [mm] SM0 LPS4012-152 1.5 Coilcraft 4x4x1 VLS4012-1R5N1R5 1.5 TDK 4x4x1 SM1 LPS4012-152 1.5 Coilcraft 4x4x1 VLS4012-1R5N1R5 1.5 TDK 4x4x1 SM2 LPS4414-152MLx 1.5 Coilcraft 4x4x1.5 1008PS-152Kx 1.5 Coilcraft 4x4x2.5 SM3 DO2010-472 4.7 Coilcraft 2x2x1 VLS3012-47M1R0 4.7 TDK 3x3x1 The advanced Fast Response voltage mode control scheme of the two converters allow the use of small ceramic capacitors with a typical value of 22 µF, without having large output voltage under and overshoots during heavy load transients. Ceramic capacitors having low ESR values result in lowest output voltage ripple and are therefore recommended. Refer to for recommended components. APPLICATION INFORMATION 92 Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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