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C2472, C2473 and C2474
Datasheet
RDFC Controllers for Offline Applications
Product data
Page 6 of 18
DS-1423-0709C
© Cambridge Semiconductor Ltd 2007
26-Sep-2007
RDFC Power Supply I-V Characteristic
Figure 5 illustrates a typical RDFC power supply characteristic with the various Active state modes of
operation identified. INOM and VNOM are the nominal output voltage and current drawn by the load at the rated
power of the application circuit.
Figure 5: Typical RDFC Power Supply Characteristic Indicating Different Active Modes of Operation
The exact thresholds for transition between modes depend on specific application characteristics, controller
internal clock frequency (FCLK) and CS pin thresholds (VOCPH and VOCPL). These parameters and their effects
are explained later.