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AN3027 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte AN3027
Spiegazioni elettronici  How to design a transition-mode PFC pre-regulator
PDF  41 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3027 Scheda tecnica(HTML) 6 Page - STMicroelectronics

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TM PFC operation (boost topology)
AN3027
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Doc ID 16134 Rev 4
(the one which is drawn from the mains) is just one-half of the peak inductor current
waveform.
Figure 3.
Inductor current waveform and MOSFET timing
The system operates not exactly on, but very close to, the boundary between continuous
and discontinuous current mode and that is why this system is called a transition mode PFC.
Besides the simplicity and the few external parts required, this system minimizes the
inductor size due to the low inductance value needed. On the other hand, the high current
ripple on the inductor involves high RMS current and high noise on the rectified main bus,
which needs a heavier EMI filter to be rejected. These drawbacks limit the use of the TM
PFC to lower power range applications.



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