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| 型号： | FAN7930CM |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/22页 |
| 文件大小： | 1725K |
| 描述： | IC PFC CTLR CRITICAL CONF 8-SOIC |
| 标准包装： | 95 |
| 模式： | 临界传导（CRM） |
| 频率 - 开关： | 250kHz ~ 350kHz |
| 电流 - 启动： | 120µA |
| 电源电压： | 13 V ~ 20 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 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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相关代理商/技术参数 |
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|---|---|
| FAN7930CMX | 功能描述:功率因数校正 IC Critical Conduction Mode PFC Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| FAN7930CMX_G | 制造商:Fairchild Semiconductor Corporation 功能描述:IC PFC CTLR CRITICAL CONF 8-SOIC 制造商:Fairchild Semiconductor Corporation 功能描述:Power Factor Correction - PFC Critical Conduction Mode PFC Controller 制造商:Fairchild Semiconductor Corporation 功能描述:Critical Conduction Mode PFC Controller |
| FAN7930DM | 制造商:Fairchild Semiconductor Corporation 功能描述:PFC |
| FAN7930DMX | 制造商:Fairchild Semiconductor Corporation 功能描述:PFC |
| FAN7930M | 功能描述:功率因数校正 IC Critical Conduction Mode PFC Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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