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FAN4803CS2

更新时间： 2024-09-18 12:52:47
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 功率因数校正控制器
页数 文件大小 规格书
12页 109K
描述
8-Pin PFC and PWM Controller Combo

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中文翻译

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FAN4803CS2 数据手册

 浏览型号FAN4803CS2的Datasheet PDF文件第2页浏览型号FAN4803CS2的Datasheet PDF文件第3页浏览型号FAN4803CS2的Datasheet PDF文件第4页浏览型号FAN4803CS2的Datasheet PDF文件第5页浏览型号FAN4803CS2的Datasheet PDF文件第6页浏览型号FAN4803CS2的Datasheet PDF文件第7页 
www.fairchildsemi.com  
FAN4 8 0 3  
8 -P in P FC a n d P WM Co n t ro lle r Co m b o  
Features  
General Description  
• Internally synchronized PFC and PWM in one 8-pin IC  
• Patented one-pin voltage error amplifier with advanced  
input current shaping technique  
The FAN4803 is a space-saving controller for power factor  
corrected, switched mode power supplies that offers very  
low start-up and operating currents.  
• Peak or average current, continuous boost, leading edge  
PFC (Input Current Shaping Technology)  
• High efficiency trailing-edge current mode PWM  
• Low supply currents; start-up: 150µA typ., operating:  
2mA typ.  
• Synchronized leading and trailing edge modulation  
• Reduces ripple current in the storage capacitor between  
the PFC and PWM sections  
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 specifications. The FAN4803 includes  
circuits for the implementation of a leading edge, average  
current “boost” type PFC and a trailing edge, PWM.  
• Overvoltage, UVLO, and brownout protection  
• PFC VCCOVP with PFC Soft Start  
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  
7
V
CC  
V
PFC OFF  
COMP  
REF  
VEAO  
REF  
+
7V  
V
OVP  
4
CC  
+
–
17.5V  
GND  
COMP  
–
16.2V  
2
1
35µA  
M3  
R1  
–1  
M2  
M4  
PFC  
CONTROL  
LOGIC  
PFC OUT  
M1  
C1  
30pF  
M7  
LEADING  
EDGE PFC  
ONE PIN ERROR AMPLIFIER  
TRAILING  
EDGE PWM  
I
SENSE  
+
COMP  
–
SOFT START  
3
–4  
PFC I  
LIMIT  
+
–
–1V  
V
PFC/PWM UVLO  
CC  
V
REF  
OSCILLATOR  
PFC – 67kHz  
PWM – 134kHz  
DUTY CYCLE  
LIMIT  
26k  
V
DC  
5
6
PWM COMPARATOR  
–
COMP  
40k  
+
PWM  
CONTROL  
LOGIC  
PWM OUT  
–
8
1.2V  
COMP  
+
I
LIMIT  
M6  
DC I  
LIMIT  
1.5V  
–
+
REV. 1.2.3 11/2/04  
1234567...12

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