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FCA20N60S Fiches technique(PDF) 5 Page - Fairchild Semiconductor

No de pièce FCA20N60S
Description  Power Factor Correction Converter Design
Download  15 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FCA20N60S Fiches technique(HTML) 5 Page - Fairchild Semiconductor

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AN-6982
APPLICATION NOTE
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 6/8/10
5
Soft-Start Function
The soft-start is combined with RDY pin operation. During
startup, the RDY pin remains floating until the PFC output
voltage reaches 96% of its nominal value. When the supply
voltage of the downstream converter is controlled by the
RDY pin, the PFC stage starts with no load since the
downstream converter does not operate until the PFC
output voltage is built to a certain level.
Usually the error amplifier output VEA is saturated to
HIGH during the startup since the actual output voltage is
less than the target value. VEA remains saturated to HIGH
until the PFC output voltage reaches its target value. Once
the PFC output reaches its target value, the error amplifier
comes out of saturation. However, it takes several line
cycles for VEA to drop to its proper value for the output
regulation, which delivers more power to the load than
required, causing output voltage overshoot.
To prevent output voltage overshoot during startup caused
by the saturation of error amplifier; FAN6982 clamps the
error amplifier output voltage (VEA) at 2.8V, which is half
of its maximum value, until PFC output reaches 96% of its
nominal value. Once the PFC output voltage reaches 96%
of its nominal value, the clamping function of VEA is
disabled. Then the voltage of PFC output is regulated by
voltage control loop.
Nominal Output Voltage
96% of Nominal Output Voltage
2.8V
VEA
VOUT
VEA
SAT
VDD of Downstream DC/DC
Input Line Current
Figure 12.
PFC Soft-Start


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