參數(shù)資料
型號(hào)： FAN4800AUN
廠商： Fairchild Semiconductor
文件頁(yè)數(shù)： 16/19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
16
 
AC Line Drops Out
FAN4800AU/CU is designed such that the operation of
PFC part is not perturbed by AC line dropout. Once line
voltage disappears, the error amplifier can be saturated,
resulting in abnormal current waveforms when the line
voltage is recovered if proper preventive measures are
not employed.
With a limited gain modulator operation, FAN4800AU
/CU guarantees stable PFC operation even when AC
line is recovered from dropout, as shown in Figure 36.
V
IN
V
E
A
V
R
M
S
P
F
C
    I   L    I  M
I  T
V
o
(   g
m
)
V
E
A
    S
a
t   u
r   a
t   i  o
n
I   L
 
Figure 36. AC Cycle Drop
 
Line Sag Protection
When the line sags below its normal operational range,
the   PFC   part   keeps   operating   until   the   brownout
protection is triggered, which has 1 s debounce time.
Due to the low line voltage, the gain modulator for
current loop is saturated and input current of PFC is
limited, resulting in a drop of the PFC output voltage at
heavy-load condition. Since the PWM part has a V
IN
 OK
comparator that shuts down PWM operation when the
FBPFC voltage drops below 1.3 V, the downstream
DC/DC converter can stop operation while the PFC
output   voltage   drops   during   line   sag.   Once   the
downstream converter stops operation, even the limited
PFC input current can charge up the PFC output since
the PFC part has no load current. Because this can
cause repeated startup and shutdown of downstream
converter during line sag, FAN4800AU/CU has line sag
protection.
There are two conditions that trigger line sag protection,
as shown in Figure 37 and Figure 38. The first condition
is when V
RMS
 is lower than V
RMS-SAG
 (0.85 V) for longer
than t
SAG
 (33 ms), as shown in Figure 37. The second
condition is when V
RMS
 is lower than V
RMS-SAG
 (0.85 V)
and VF
BPFC
  is lower than V
IN-OFF
  (1.3 V), as shown in
Figure 38. Once line sag protection is triggered, the
PWM and the PFC stop operation until V
RMS
 increases
above 1.9 V.
 
 
 
 
 
V F
B P F C
V
I N
V
R  M  S
0 . 8 5 V
3 3 m  s
 
Figure 37. The First Condition of Sag Protection
 
V  F
B   P   F   C
V
I N
V
R   M    S
0 . 8 5 V
2 5 m  s
1 . 3 V
 
Figure 38. The Second condition of Sag Protection
 
 
 
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FAN4800C 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC/PWM Controller Combination
FAN4800CMY 功能描述:電流型 PWM 控制器 PWM/PFC, Avg Curr 30uA SU, 2.6mA Op RoHS:否 制造商:Texas Instruments 開關(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
FAN4800CNY 功能描述:電流型 PWM 控制器 PWM/PFC, Avg Curr 30uA SU, 2.6mA Op RoHS:否 制造商:Texas Instruments 開關(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
FAN4800CS 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC/PWM Controller Combination
FAN4800CSMY 功能描述:電流型 PWM 控制器 PFC/PWM Controller Combination RoHS:否 制造商:Texas Instruments 開關(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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