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TPS65010RGZT Datasheet(PDF) 49 Page - Texas Instruments |
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TPS65010RGZT Datasheet(HTML) 49 Page - Texas Instruments |
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49 / 63 page  L L(max) O(max) I I I 2 D = + O I L O V 1 V I V L ƒ - D = ´ ´ TPS65010 www.ti.com SLVS149C – JUNE 2003 – REVISED SEPTEMBER 2015 Typical Applications (continued) 8.2.1.1 Design Requirements Each DC/DC converter requires an external inductor and filter capacitor, capable of sustain the intended current with an acceptable voltage ripple. LDOs must have external filter capacitors, and LDO1 requires an external feedback network for regulation. Every input supply rail requires a decoupling capacitor close to the pin, and to avoid unintended states, logic inputs without internal resistors must not be left floating. 8.2.1.2 Detailed Design Procedure 8.2.1.2.1 Inductor Selection for the Main and the Core Converter The main and the core converters in the TPS65010 typically use a 6.2-µH and a 10-µH output inductor respectively. 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 influences directly the efficiency of the converter. Therefore, an inductor with lowest dc resistance is selected for highest efficiency. Equation 3 calculates the maximum inductor current under static load conditions. The saturation current of the inductor must be rated higher than the maximum inductor current as calculated with Equation 3. This is needed because during heavy load transient, the inductor current rises above the value calculated under Equation 3. (3) where • f = Switching Frequency (1.25 MHz typical) • L = Inductor Value • ΔIL= Peak-to-peak inductor ripple current • ILmax = Maximum inductor current (4) The highest inductor current occurs at maximum VI. 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 TPS65010 (2 A for the main converter and 0.8 A for the core converter). Keep in mind that the core material from inductor to inductor differs and has an impact on the efficiency especially at high switching frequencies. Refer to Table 29 and the typical applications for possible inductors Table 29. Tested Inductors DEVICE INDUCTOR VALUE DIMENSIONS COMPONENT SUPPLIER 10 µH 6,0 mm × 6,0 mm × 2,0 mm Sumida CDRH5D18-100 Core converter 10 µH 5,0 mm × 5,0 mm × 3.0 mm Sumida CDRH4D28-100 4.7 µH 5,5 mm × 6,6 mm*1.0 mm Coilcraft LPO1704-472M 4.7 µH 5,0 mm × 5,0 mm × 3.0 mm Sumida CDRH4D28C-4.7 4.7 µH 5,2 mm × 5.2 mm × 2.5 mm Coiltronics SD25-4R7 Main converter 5.3 µH 5,7 mm × 5.7 mm × 3.0 mm Sumida CDRH5D28-5R3 6.2 µH 5,7 mm × 5.7 mm × 3.0 mm Sumida CDRH5D28-6R2 6.0 µH 7.0 mm × 7.0 mm × 3.0 mm Sumida CDRH6D28-6R0 Copyright © 2003–2015, Texas Instruments Incorporated Submit Documentation Feedback 49 Product Folder Links: TPS65010 |
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