FAN9611MX【PDF 22/35 页】IC PFC CTLR DUAL BCM 16-SOIC

?2008 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN9611 " Rev. 1.1.7

Figure 32. Interleaved BCM PFC Schematic Using FAN9611

Step 2

: Estimated Conversion Efficiency

Use the estimated full-load power conversion efficiency.

Typical value for an interleaved BCP PFC converter is in

the 0.92 to 0.98 range. The efficiency is in the lower half

of the range for low-power applications. Using state-of-

the-art semiconductors, good quality ferrite inductors

and selecting lower limit for minimum switching

frequency positively impacts the efficiency of the

system. In general, the value of 0.95 can be used

unless a more accurate power budget is available.

Step 3

: Maximum Output Power per

Channel

1.2

OUT

MAX,

?/DIV>

(6)

A margin of 20% has been added to the nominal output

power to cover reference inaccuracy, internal

component tolerances, inductance mismatch, and

current-sense resistor variation to the per-channel

power rating.

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