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TPS65020 Datasheet(PDF) 39 Page - Texas Instruments |
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TPS65020 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 53 page  I Lmax + Ioutmax ) DIL 2 DIL + Vout 1 * Vout Vin L ƒ TPS65020 www.ti.com SLVS607D – SEPTEMBER 2005 – REVISED JANUARY 2016 Typical Application (continued) For a fast transient response, a 2.2- μH inductor in combination with a 22-μF output capacitor is recommended. Equation 8 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 8. This is needed because during heavy-load transient the inductor current rises above the value calculated under Equation 8. (8) where • f = Switching Frequency (1.5 MHz typical) • L = Inductor Value • ΔIL = Peak-to-Peak inductor ripple current • ILMAX = Maximum Inductor current (9) The highest inductor current occurs 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 TPS65020 (2 A for the VDCDC1 and VDCDC2 converters, and 1.3 A for the VDCDC3 converter). The core material from inductor to inductor differs and has an impact on the efficiency especially at high switching frequencies. See Table 16 and the typical applications for possible inductors. Table 16. Tested Inductors INDUCTOR DEVICE TYPE COMPONENT SUPPLIER VALUE 3.3 μH CDRH2D14NP-3R3 Sumida 3.3 μH LPS3010-332 Coilcraft DCDC3 converter 3.3 μH VLF4012AT-3R3M1R3 TDK 2.2 μH VLF4012AT-2R2M1R5 TDK 2.2 μH NR3015T2R2 Taiyo-Yuden 3.3 μH CDRH2D18/HPNP-3R3 Sumida DCDC2 converter 3.3 μH VLF4012AT-3R3M1R3 TDK 2.2 μH VLCF4020-2R2 TDK 3.3 μH CDRH3D14/HPNP-3R2 Sumida 3.3 μH CDRH4D28C-3R2 Sumida DCDC1 converter 3.3 μH MSS5131-332 Coilcraft 2.2 μH VLCF4020-2R2 TDK 9.2.2.2 Output Capacitor Selection The advanced fast response voltage mode control scheme of the inductive converters implemented in the TPS65020 allow the use of small ceramic capacitors with a typical value of 10 μF for a 3.3-μH inductor for each converter without having large output voltage under and overshoots during heavy-load transients. For a fast transient response a 22- μF capacitor with a 2.2-μH inductor must be used on each converter. Ceramic capacitors having low ESR values have the lowest output voltage ripple and are recommended. See Table 17 for recommended components. If ceramic output capacitors are used, the capacitor RMS ripple current rating always meets the application requirements. Just for completeness, the RMS ripple current is calculated in Equation 10. Copyright © 2005–2016, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: TPS65020 |
Similar Part No. - TPS65020_16 |
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Similar Description - TPS65020_16 |
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