參數(shù)資料
型號(hào)： FAN4800CUN
廠商： Fairchild Semiconductor
文件頁(yè)數(shù)： 14/19頁(yè)
文件大?。?/td> 1414K
描述： IC PWM/PFC CTLR COMBO 16-MDIP
標(biāo)準(zhǔn)包裝： 1,800
模式： 平均電流
頻率 - 開(kāi)關(guān)： 240kHz ~ 268kHz
電流 - 啟動(dòng)： 30µA
電源電壓： 11 V ~ 22 V
工作溫度： -40°C ~ 105°C
安裝類(lèi)型： 通孔
封裝/外殼： 16-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 16-MDIP
包裝： 管件
 
?2011 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN4800AU/CU " Rev. 1.0.1
14
 
V
RM S
V
R M S -U V P
2
1
R
M
S
V
?/DIV>
7.94
 
Figure 29. Modulation Gain Characteristics
V
IN
I
L
V
E A
 
Figure 30. Line Feed-Forward Operation
To sense the RMS value of the line voltage, averaging
circuit with two poles is typically employed, as shown in
Figure 28. Notice that the input voltage of the PFC is
clamped at the peak of the line voltage once the PFC
stops switching because the junction capacitance of the
bridge diode is not discharged, as shown in Figure 31.
Therefore, the voltage divider for VRMS should be
designed considering the brownout protection trip-point
and minimum operation line voltage.
PFC Runs
PFC Stops
V
IN
V
RMS
 
Figure 31. V
RMS
 According to the PFC Operation
 
 
The rectified sinusoidal signal is obtained by the current
flowing into the IAC pin. The resistor R
IAC
  should be
large   enough   to   prevent   saturation   of   the   gain
modulator, calculating as:
A
G
R
V
M A X
IA
M IN
LINE
m
140
2
<
?/DIV>
 
(3)
where V
LINEMIN
 is the line voltage that trips brownout
protection, G
MAX
  is the maximum modulator gain
when V
RMS
  is 1.08 V (which can be found in the
datasheet), and 140 礎(chǔ) is the maximum output
current of the gain modulator.
Current Control of Boost Stage
The FAN4800AU/CU employs two control loops for
power factor correction, as shown in Figure 32: a
current-control loop and a voltage-control loop. The
current-control loop shapes inductor current as shown
in Figure 33 based on the reference signal obtained at
the IAC pin calculated as:
M
A
M
M
L
R
G
I
R
I
R
?/DIV>
?/DIV>
=
?/DIV>
=
?/DIV>
1
 
(4)
 
 
IS E N S E
IA C
V R M S
V E A
IE A
R
M
R  M
R
R M  S 1
R
R M  S 2
R  R M  S 3
C
R M  S 1
C  R M  S 2
R  I A C
I
A C
V
I N
I
L
R
C S 1
R
F 1
C
F 1
I M  O
R
I C
C  I C 1
C
I C 2
+
-
D riv e
lo g ic
O P F C
2 .5 V
R
V C
R
V C 1
R
V C 2
F B P F C
R
F B 1
R
F B 2
V
O
V R E F
 
Figure 32. Gain Modulation Block
I
A C
I
L
M
M
O
R
R
 
Figure 33. Inductor Current Shaping
The current-control feedback loop also has a pulse-by-
pulse current limit comparator that forces the PFC
switch to turn off until the next switching cycle if the
ISENSE pin voltage drops below -1.3 V.
 
 
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FAN4800IM 功能描述:電流型 PWM 控制器 ANG FG PFC and PWM CONTROLLER ASMC DIE RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
FAN4800IMX 功能描述:電流型 PWM 控制器 Controller PFC - PWM Combo RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
FAN4800IN 功能描述:電流型 PWM 控制器 ANG FG PFC and PWM CONTROLLER ASMC DIE RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
FAN4800IN_G 功能描述:電流型 PWM 控制器 ANG FG PFC & PWM CONTROLLER ASMC DIE RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
FAN4800IN_SB82230 功能描述:電流型 PWM 控制器 ANG FG PFC & PWM CONTROLLER ASMC DIE RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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