參數(shù)資料
型號： FAN7930CM
廠商： Fairchild Semiconductor
文件頁數(shù)： 12/22頁
文件大?。?/td> 1725K
描述： IC PFC CTLR CRITICAL CONF 8-SOIC
標準包裝： 95
模式： 臨界傳導（CRM）
頻率 - 開關： 250kHz ~ 350kHz
電流 - 啟動： 120µA
電源電壓： 13 V ~ 20 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 8-SOP
包裝： 管件
 
?2010 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN7930C " Rev. 1.0.2
12
 
P F  C   o  p  e  r a  t i o  n
V
C C
V
S T   A   R    T
V
S   T   O    P
5  V
V
I N  V
( =  V
P  F  C  O   U  T
)
2  . 2  4  0  V
2  . 0  5  1  V
V
R  D  Y
2  . 5  0  0  V
t
 
P  F  C   o  p  e  r a  t i o  n
V
C  C
V
S   T   A   R    T
V
S   T   O    P
5  V
V
I N  V
( =  V
P  F  C  O   U  T
)
2  . 2  4  0  V
2  . 0  5  1  V
V
R  D  Y
2  . 5  0  0  V
t
 
Figure 25.    Two Cases of RDY Triggered HIGH
P  F  C   o  p  e  r a  t i o  n
V
C  C
V
S   T   A   R    T
V
S   T   O    P
5  V
V
I N  V
( =  V
P  F  C  O   U  T
)
2  . 2  4  0  V
2  . 0  5  1  V
V
R  D  Y
2  . 5  0  0  V
t
 
P  F  C   o  p  e  r a  t i o  n
V
C  C
V
S   T   A   R    T
V
S   T   O    P
5  V
V
I N  V
( =  V
P  F  C  O   U  T
)
2  . 2  4  0  V
2  . 0  5  1  V
V
R  D  Y
2  . 5  0  0  V
t
 
Figure 26.    Two Cases of RDY Triggered LOW
4. Control Range Compensation: On time is controlled 
by the output voltage compensator with FAN7930C.
Due to this when input voltage is high and load is light,
control range becomes narrow compared to when input
voltage is low. That control range decrease is inversely
proportional to the double square of the input voltage
(  control range 
1
input voltage
2
).   Thus   at   high   line,
unwanted burst operation easily happens at light load
and audible noise may be generated from the boost
inductor or inductor at input filter. Different from the
other converters, burst operation in PFC block is not
needed   because   the   PFC   block   itself   is   normally
disabled during standby mode. To reduce unwanted
burst operation at light load, an internal control range
compensation function is implemented and shows no
burst operation until 5% load at high line. 
5.   Zero-Current   Detection:   Zero-current   detection 
(ZCD) generates the turn-on signal of the MOSFET
when the boost inductor current reaches zero using an
auxiliary winding coupled with the inductor. When the
power switch turns on, negative voltage is induced at the
auxiliary winding due to the opposite winding direction
(see   Equation   1).   Positive   voltage   is   induced   (see
Equation 2) when the power switch turns off. 
AC
IND
AUX
AUX
V
T
T
?/DIV>
-
=
 
(1)
(
)
AC
PFCOUT
IND
AUX
AUX
V
V
T
T
-
?/DIV>
=
(2) 
where:
V
AUX
is the auxiliary winding voltage;
T
IND
 is boost inductor turns;
T
IND
 auxiliary winding turns;
V
AC
 is input voltage for PFC converter; and
V
OUT_PFC
is output voltage from the PFC converter.
P  F  C   I n  d  u  c  t o  r
A  u  x   W   i n  d  i n  g
V
I N
P   F  C
V
O   U   T
P   F  C
Z  C  D
V
TH  ( Z  C  D  )
+
-
V
C  C
T   H   D    o  p  t i m   i z  e  d  
S   a  w   t o  o  t h  
G   e  n  e  r a  t o  r
R   e  s  t a  r t
T   i m   e  r
g  a  t e
d  r i v  e  r
R
Z  C   D
C
Z  C   D
N  e g a t i v e C  l a m  p
C  i r c u i t
P  o s i t i v e C  l a m  p
C  i r c u i t
5
S
Q
R
Q
f M  A  X
l i m   i t
o p t i o n a l
 
Figure 27.    Circuit Near ZCD
Because auxiliary winding voltage can swing from
negative to positive voltage, the internal block in ZCD
pin has both positive and negative voltage clamping
circuits. When the auxiliary voltage is negative, an
internal circuit clamps the negative voltage at the ZCD
pin around 0.65 V by sourcing current to the serial
resistor   between   the   ZCD   pin   and   the   auxiliary
winding. When the auxiliary voltage is higher than
6.5 V, current is sinked through a resistor from the
auxiliary winding to the ZCD pin.
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