FAN4803 Fairchild Semiconductor, FAN4803 Datasheet

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FAN4803

Manufacturer Part Number
FAN4803
Description
To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency at light-load conditions
Manufacturer
Fairchild Semiconductor
Datasheets

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Features
• Internally synchronized PFC and PWM in one 8-pin IC
• Patented one-pin voltage error amplifier with advanced
• Peak or average current, continuous boost, leading edge
• High efficiency trailing-edge current mode PWM
• Low supply currents; start-up: 150µA typ., operating:
• Synchronized leading and trailing edge modulation
• Reduces ripple current in the storage capacitor between
• Overvoltage, UVLO, and brownout protection
• PFC V
Block Diagram
FAN4803
8-Pin PFC and PWM Controller Combo
input current shaping technique
PFC (Input Current Shaping Technology)
2mA typ.
the PFC and PWM sections
CC
OVP with PFC Soft Start
4
3
5
6
VEAO
I SENSE
V DC
I LIMIT
–1V
26k
40k
V REF
ONE PIN ERROR AMPLIFIER
+
M1
M6
PFC I LIMIT
35 A
M7
V CC
7V
1.2V
+
COMP
PFC/PWM UVLO
M2
PFC OFF
–1
+
–4
COMP
PWM – 134kHz
OSCILLATOR
PFC – 67kHz
PWM COMPARATOR
+
COMP
M3
R1
1.5V
30pF
C1
+
DUTY CYCLE
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.
DC I LIMIT
LIMIT
M4
V CC
17.5V
+
COMP
16.2V
7
+
COMP
V CC OVP
CONTROL
LOGIC
PFC
SOFT START
CONTROL
LOGIC
PWM
www.fairchildsemi.com
REF
EDGE PWM
EDGE PFC
TRAILING
LEADING
PWM OUT
PFC OUT
REV. 1.2.3 11/2/04
V REF
GND
2
1
8

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