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AN557 数据表(PDF) 41 Page - STMicroelectronics |
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AN557 数据表(HTML) 41 Page - STMicroelectronics |
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41 / 52 page  41/52 AN557 APPLICATION NOTE Figure 54. Typical power supply showing the mains transformer. Figure 55. Forward Topology Further is showed an smps forward circuit, where the dc-dc converter is used as post-regulator for an aux- iliary output, (35V.) while the main one (5.1V. or 3.3V) is controlled directly with the feedback (See Fig. 56). Using a PFC preregulation When an optimized power factor is required it is possible to use the following two pricinple diagram that make use of an active power factor corrector. 1) using the standard boost topology (Fig. 57) 2) using a flyback topology (Fig. 58) The idea is that to generate a stabilized voltage, around 30V - 35V, already isolated, avoiding to use an isolation after the PFC section. |
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