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參數資料
| 型號： | FAN4800CUN |
| 廠商： | Fairchild Semiconductor |
| 文件頁數： | 16/19頁 |
| 文件大小： | 1414K |
| 描述： | IC PWM/PFC CTLR COMBO 16-MDIP |
| 標準包裝： | 1,800 |
| 模式： | 平均電流 |
| 頻率 - 開關： | 240kHz ~ 268kHz |
| 電流 - 啟動： | 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） |
| 供應商設備封裝： | 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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相關代理商/技術參數 |
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| 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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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