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AN3142 Datasheet(PDF) 37 Page - STMicroelectronics

Part # AN3142
Description  Solution for designing a 400 W fixed-off-time controlled
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3142 Datasheet(HTML) 37 Page - STMicroelectronics

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AN3142
L6563H: high voltage startup transition mode PFC
Doc ID 17005 Rev 3
37/44
Figure 25.
High-voltage startup managing the DC-DC output short circuit
Figure 25 shows how the PFC manages the Vcc cycling and the associated power transfer.
At short circuit the auxiliary circuit is no longer able to sustain the Vcc which starts dropping;
reaching its VccOFF threshold the IC stops switching, reduces consumption and drops more
until the Vccrestart threshold is tripped. Now, the high voltage startup generator restarts and
when the Vcc crosses its turn-on threshold again the IC starts switching. In this manner the
power is transferred from mains to PFC output only during a short time for each Trep cycle.



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