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AN4376 数据表(PDF) 7 Page - STMicroelectronics |
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AN4376 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 37 page  DocID025380 Rev 1 7/37 AN4376 Theory of operation 37 Waveforms are represented in case of transition operating mode that is on the boundary between continuous and discontinuous conduction mode, this is the most efficient and an easy way to design EMI compliant low power single-stage LED drivers. Figure 6 and Figure 7 represent the split current. To design a single-stage LED driver with a high power factor it is enough to modulate the peak current of Figure 5 with a sinusoidal reference like in a common PFC in order to put the input voltage with input current into phase. Figure 6. TM (transition mode) flyback waveforms Figure 7. TM (transition mode) buck-boost waveforms |
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