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/Title (NCL2801 - Power Factor Controller, High-Efficiency, Enhanced for Lighting)
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Ƶ
NCL2801 - Power Factor Controller, High-Efficiency, Enhanced for Lighting
The 8−pin PFC controller NCL2801 is designed to drive PFC boost
stages. It is based on an innovative Valley Count Frequency
Fold−back (VCFF) method. The circuit classically operates in
Critical conduction Mode (CrM) for high load values. When the load
decreases a Discontinuous Conduction Mode DCM is forced by
forcing a dead time which, by construction corresponds to a fixed
number of valleys. The lower the output power, the higher the number
of valleys corresponding to the dead time. After DCM works down to
6th valley switching and if the load continues to decrease, a dead time
is continuously added to the 6th valley. The end of additional dead time
is synchronized with the drain voltage valley. The maximum
switching period is limited to 36.5 s. VCFF maximizes the
efficiency during DCM and light load. In particular, the stand−by
losses are reduced to a minimum. Like in FCCrM controllers, internal
circuitry allows near−unity power factor even when the switching
frequency is reduced. Housed in a SO−8 package, the circuit also
incorporates the features necessary for robust and compact PFC
stages, with few external components.
2025-03-05T09:09:17-07:00
BroadVision, Inc.
2025-03-05T09:14:05-07:00
2025-03-05T09:14:05-07:00
Acrobat Distiller 24.0 (Windows)
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