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FQA13N50C bảng dữ liệu(PDF) 4 Page - Fairchild Semiconductor

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Giải thích chi tiết về linh kiện  PFCPWM Combination Controller
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AN-8027
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 8/26/09
4
RT/
CT
OPFC
OPWM
OPWM (FAN4800C, FAN4802/2L)
PFC dead time
Figure 9. FAN480X Timing Diagram
PWM Stage
The PWM stage is capable of current-mode or voltage-
mode operation. In current-mode applications, the PWM
ramp (RAMP) is usually derived directly from a current
sensing resistor or current transformer in the primary of the
output stage and is thereby representative of the current
flowing in the converter’s output stage. ILIMIT, which
provides cycle-by-cycle current limiting, is typically
connected to RAMP in such applications.
For voltage-mode operation, RAMP can be connected to a
separate RC timing network to generate a voltage ramp
against which FBPWM voltage is compared. Under these
conditions, the use of voltage feed-forward from the PFC
bus can be used for better line transient response.
No voltage error amplifier is included in the PWM stage,
as this function is generally performed by a programmable
shunt regulator, such as KA431, in the secondary-side. To
facilitate the design of opto-coupler feedback circuitry, an
offset voltage is built into the inverting input of PWM
comparator that allows FBPWM to command a zero
percent duty cycle when its pin voltage is below 1.5V.
V
BOUT
RAMP
R
RAMP
C
RAMP
REF
+
-
PWM
FBPWM
1.5V
Figure 10. PWM Ramp Generation Circuit
PWM Current Limit
The ILIMIT pin is a direct input to the cycle-by-cycle
current limiter for the PWM section. If the input voltage at
this pin exceeds 1V, the output of the PWM is disabled
until the start of the next PWM clock cycle.
VIN OK Comparator
The VIN OK comparator monitors the output of the PFC
stage and inhibits the PWM stage if this voltage is less than
2.4V (96% of its nominal value). Once this voltage goes
above 2.4V, the PWM stage begins to soft-start.
PWM Soft-Start (SS)
PWM startup is controlled by the soft-start capacitor. A
10µA current source supplies the charging current for the
soft-start capacitor. Startup of the PWM is prohibited until
the soft-start capacitor voltage reaches 1.5V.


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