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www.ti.com Mode Transition
Figure 4. Mode Transition
Figure 4 illustrates soft mode transition. The boost switch pulse-width is relatively narrow compared to the
buck switch waveform. The boost switch pulse-width will gradually increase as VIN decreases, and will
eventually match and lock to the buck switch waveform. At this point, the converter enters full buck-boost
operation.
5
SNVA614B–January 2012–Revised January 2014 AN-2205 LM25118 Evaluation Board
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