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AN2754 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN2754 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 20 page AN2754 Buck topology switching power supply 7/20 We can find the inductor current by integrating the inductor voltage waveform. Equation 5 Figure 6. Inductor current waveform Equation 6 The inductor current increase during the ON state is given by: Equation 7 The OFF state is when the high side is OFF and the low side ON. Figure 7. Buck converter circuit while the switch is in position 2 () ( ) t L V V nT i t nT i out S L ⋅ − + = + () ( ) ' ' t L V V nT i t nT i OUT S L ⋅ − + = + nT+DT nT (n+1)T () ( ) '' '' t L V DT nT i t i OUT L ⋅ − + = t iL IOUT t’ t’’ () DT L V V nT i I out S max L ⋅ − + = DT L V V i out S L ⋅ − = ∆ |
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