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AN557 Datasheet(PDF) 41 Page - STMicroelectronics

No. de pieza AN557
Descripción Electrónicos  EASY APPLICATION DESIGN WITH THE L4970A
PDF  52 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN557 Datasheet(HTML) 41 Page - STMicroelectronics

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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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