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Fairchild Semiconductor - 8-Pin PFC and PWM Controller Combo

Numéro de référence FAN4803
Description 8-Pin PFC and PWM Controller Combo
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN4803 fiche technique
www.fairchildsemi.com
FAN4803
8-Pin PFC and PWM Controller Combo
Features
• Internally synchronized PFC and PWM in one 8-pin IC
• Proprietary one-pin voltage error amplifier with advanc
input current shaping technique
• 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
• 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 specifications. 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
VEAO
4
7V
35µA
+ PFC OFF
COMP
–1
M1 M2
M7
M3
R1
7
VCC
17.5V
16.2V
C1
30pF
M4
ISENSE
3
–1V
ONE PIN ERROR AMPLIFIER
+ PFC ILIMIT
VCC
–4
PFC/PWM UVLO
+
COMP
VREF
26k
VDC
5
40k
ILIMIT
6
1.2V
OSCILLATOR
PFC – 67kHz
PWM – 134kHz
DUTY CYCLE
LIMIT
PWM COMPARATOR
COMP
+
COMP
+
M6
1.5V
DC ILIMIT
+
+ VCC OVP
COMP
REF
VREF
GND
2
PFC
CONTROL
LOGIC
SOFT START
PFC OUT
1
LEADING
EDGE PFC
TRAILING
EDGE PWM
PWM
CONTROL
LOGIC
PWM OUT
8
REV. 1.2.3 11/2/04

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