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UCC28056CDBVT 데이터시트(PDF) 31 Page - Texas Instruments |
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UCC28056CDBVT 데이터시트(HTML) 31 Page - Texas Instruments |
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31 / 55 page ![]() u u OutMax LRMSMax InRMSMin 110% P 2 I 2.5 A V 3 S u T T u S ³ 2 InRMS LRMS LRMS InEq 0 V 1 2 I I d R 3 T u T T u u T LPkS LAvS InPkL LRMS InEqMin I 2 I V 2 I sin R 3 3 3 IL(t, ) t 0 0 Œ ILPkS( ) ILRMS( ) ILAvS( ) ILPkS( ) ILRMS( ) ILAvS( ) TON TDCH( ) 31 UCC28056 www.ti.com SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019 Product Folder Links: UCC28056 Submit Documentation Feedback Copyright © 2017–2019, Texas Instruments Incorporated Figure 27. Ideal Transition Mode (CrM) Inductor Current Equation 25 describes the he Boost inductor RMS current over a single switching cycle, at angle θ through the Line half-cycle. (25) Equation 26 describes the Boost inductor RMS current over a complete Line cycle. (26) Maximum Boost inductor RMS current occurs at minimum Line voltage and maximum input power. (27) Based upon the inductor requirements, a custom magnetic can be designed, or a suitable catalogue controller selected. Table 2. Inductor Requirements Description Value Unit Inductance 200 µH RMS Current 2.5 A Saturation Current 8.8 A 9.2.2.2.2 Boost Switch Selection The power switch carries the Boost inductor current during its ON period (TON). It carries no current during its OFF period (TDCH). Equation 28 describes the switch RMS current, over a single switching cycle, at angle θ in the Line half-cycle. |
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