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| 型号： | FAN4803CSX-1 |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 67 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 1/12页 |
| 文件大小： | 131K |
| 代理商： | FAN4803CSX-1 |
www.fairchildsemi.com
REV. 1.2.0 6/21/01
Features
Internally synchronized PFC and PWM in one 8-pin IC
Patented one-pin voltage error amplier with advanced
input current shaping technique
Peak or average current, continuous boost, leading edge
PFC (Input Current Shaping Technology)
High efciency trailing-edge current mode PWM
Low supply currents; start-up: 150A typ., operating:
2mA typ.
Synchronized leading and trailing edge modulation
Reduces ripple current in the storage capacitor between
the PFC and PWM sections
Overvoltage, UVLO, and brownout protection
PFC VCCOVP with PFC Soft Start
General Description
The FAN4803 is a space-saving controller for power factor
corrected, switched mode power supplies that offers very
low start-up and operating currents.
Power Factor Correction (PFC) offers the use of smaller, lower
cost bulk capacitors, reduces power line loading and stress on
the switching FETs, and results in a power supply fully compli-
ant to IEC1000-3-2 specications. The FAN4803 includes
circuits for the implementation of a leading edge, average
current “boost” type PFC and a trailing edge, PWM.
The FAN4803-1’s PFC and PWM operate at the same
frequency, 67kHz. The PFC frequency of the FAN4803-2 is
automatically set at half that of the 134kHz PWM. This
higher frequency allows the user to design with smaller
PWM components while maintaining the optimum operating
frequency for the PFC. An overvoltage comparator shuts
down the PFC section in the event of a sudden decrease in
load. The PFC section also includes peak current limiting for
enhanced system reliability.
Block Diagram
ISENSE
3
VEAO
4
VDC
5
ILIMIT
6
GND
2
PWM OUT
8
PFC OUT
1
–
+
–
+
COMP
35
A
16.2V
17.5V
VCC
+
–
COMP
+
–
–1V
SOFT START
PFC/PWM UVLO
DUTY CYCLE
LIMIT
OSCILLATOR
PFC – 67kHz
PWM – 134kHz
VREF
1.2V
26k
40k
M1
R1
C1
30pF
M2
M7
M3
M4
M6
PWM
CONTROL
LOGIC
–
+
1.5V
DC ILIMIT
PFC ILIMIT
PWM COMPARATOR
VCC OVP
PFC OFF
ONE PIN ERROR AMPLIFIER
LEADING
EDGE PFC
TRAILING
EDGE PWM
+
–
COMP
7V
+
–
COMP
–1
–4
REF
VCC
7
PFC
CONTROL
LOGIC
FAN4803
8-Pin PFC and PWM Controller Combo
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN480X | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:PFC+PWM Combination Controller |
| FAN4810 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Power Factor Correction Controller |
| FAN4810EVAL | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Power Factor Controller |
| FAN4810M | 功能描述:功率因数校正 IC PFC Preregulator 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 |
| FAN4810M_Q | 功能描述:功率因数校正 IC PFC Preregulator 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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