FAN4800 Fairchild Semiconductor, FAN4800 Datasheet - Page 15
FAN4800
Manufacturer Part Number
FAN4800
Description
Low Start-Up Current PFC/PWM Controller Combos
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN4800.pdf
(20 pages)
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FAN4800 Rev. 1.0.5
© 2005 Fairchild Semiconductor Corporation
REF
+
+
REF
VIN
DC
VIN
DC
OSC
OSC
U4
U4
EA
EA
L1
L1
I1
I1
U3
U3
CLK
CLK
RAMP
RAMP
SW1
SW1
SW2
SW2
VEAO
VEAO
Figure 11. Typical Leading-Edge Control Scheme
Figure 10. Typical Trailing-Edge Control Scheme
CMP
CMP
U1
U1
C1
C1
I2
I2
I4
I4
I3
I3
RL
R
RL
R
D
D
DFF
DFF
U2
U2
CLK
CLK
15
Q
Q
Q
Q
RAMP
RAMP
VEAO
VEAO
TIME
TIME
TIME
TIME
FAN4800 Rev.02
FAN4800 Rev.02
www.fairchildsemi.com
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