Fiche : [DATA191]

Titre : AN1089, C. ADRAGNA, CONTROL LOOP MODELING OF L6561-BASED TM PFC, APPLICATION NOTE, STMicroelectronics, March 2000.

Cité dans : [DIV009]  Application Note ST Microelectronics, juillet 2005.
Cité dans : [DATA193] Recherche sur les PFC, Power Factor Controller, novembre 2004.

Site : http://www.st.com
Lien : AN1089.pdf - 12 pages, 107 Ko, march 2000
Lien : L6561.pdf - 13 pages, 173 Ko, june 2004.

Introduction :
This paper provides a model and a tool for evaluating and improving the control loop characteristics
of L6561-based PFC preregulators in boost topology and operated in Transition Mode (TM).
Such a subject is now becoming topical since TM PFC preregulators are more and more used in sys-
tems other than electronic lamp ballast where the input voltage range is limited and the load current
is almost constant.
The ability to operate under large variations of both input voltage and load current, as well as the use
of TM PFC systems as preregulators for switching converters, requires a more accurate design of the
control loop. The goal will be not only to ensure a narrow bandwidth in order to achieve a high Power
Factor, but also to have enough phase margin so as to make sure the system is stable over a large
range of operating conditions.

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