- 您现在的位置：买卖IC网 > Datasheet目录38 > FAN4800AUN (Fairchild Semiconductor)IC PWM/PFC CTLR COMBO 16-MDIP Datasheet资料下载
参数资料
| 型号： | FAN4800AUN |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 16/19页 |
| 文件大小： | 1414K |
| 描述： | IC PWM/PFC CTLR COMBO 16-MDIP |
| 标准包装： | 1,800 |
| 模式： | 平均电流 |
| 频率 - 开关： | 240kHz ~ 268kHz |
| 电流 - 启动： | 30µA |
| 电源电压： | 11 V ~ 22 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-MDIP |
| 包装： | 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
相关PDF资料 |
PDF描述 |
|---|---|
| FAN4800CUN | IC PWM/PFC CTLR COMBO 16-MDIP |
| FAN4802MY | IC PFC CTRLR AVERAGE CURR 16SOP |
| FAN4802SNY | IC CTLR PFC/PWM COMBO 16-PDIP |
| FAN6920MRMY | IC PWM CTLR PFC/QUASI-RES 16SOP |
| FAN6921MLMY | IC CTLR PFC/FLYBACK 16-SOICN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN4800C | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:PFC/PWM Controller Combination |
| FAN4800CMY | 功能描述:电流型 PWM 控制器 PWM/PFC, Avg Curr 30uA SU, 2.6mA Op RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN4800CNY | 功能描述:电流型 PWM 控制器 PWM/PFC, Avg Curr 30uA SU, 2.6mA Op RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN4800CS | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:PFC/PWM Controller Combination |
| FAN4800CSMY | 功能描述:电流型 PWM 控制器 PFC/PWM Controller Combination RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
发布紧急采购，3分钟左右您将得到回复。