FAN9611 Fairchild Semiconductor, FAN9611 Datasheet - Page 23

• Manufacturer Part Number: FAN9611
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN9611 / FAN9612 • Rev. 1.1.4
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.
Figure 33. Interleaved BCM PFC Schematic Using FAN9611/12
23
Step 3: Maximum Output Power per
Channel
A margin of 20% has been added to the nominal output
power
component tolerances, inductance mismatch, and
current-sense resistor variation to the per-channel
power rating.
P
MAX,
CH
to

1.2
cover

P
OUT
2
reference
inaccuracy,
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internal
(6)