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Número de pieza
componentes Descripción
FAN6920MR Ver la hoja de datos (PDF) - Fairchild Semiconductor
Número de pieza
componentes Descripción
Fabricante
FAN6920MR
Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller
Fairchild Semiconductor
FAN6920MR Datasheet PDF : 24 Pages
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Internal Block Diagram
COMP
HV
VDD
INV
CSPFC
FB
CSPWM
DET
2
16
7
RANGE
2.65V
Multi-Vector Amp.
2.75V
2.3V
3
RANGE
2.75V
2.9V
OVP
I
HV
UVP
V
COMP-H
0.45V
I
COMP-BURST
V
COMP-L
COMP-L
COMP-H
27.5V
Debounce
70µs
OVP
Two-Step
UVLO
12V/7V/5V
Auto-Recovery
Auto-
Recovery
Brownout
S
SET
Q
R
CLR
Q
Internal
Bias
15
NC
DRV
6
15.5V
OPFC
4
11
2.5V
THD
Optimizer
Sawtooth
Generator
t
on-max
Restarter
Blanking
Circuit
5V
Soft-Start
5ms
0.82V
4.2V
2R
R
PFC
Current Limit
V
COMP-H
COMP-H
COMP-L
Disable
Function
0.2V
Inhibit
Timer
V
CTRL-PFC
Debounce
Timer
50ms
2.25ms
VB
28µs
Starter
PFC Burst Mode
V
IN
V
INV
0.7V
Auto-Recovery
FB OLP
2.3V/0.8V
V
INV
PWM-ON/OFF
PFC Zero-Current
Detector
2.1V/1.75V
14
I
ZCD
10V
Blanking
5
Circuit
Over-Power
Compensation
PWM
Current Limit
I
DET
10
t
OFF-MIN
I
DET
(5µs/20.5µs/2.25ms)
Valley
Detector
(30µA)
1st
Valley
t
OFF
Blanking
(2.5µs)
S/H
V
DET
2.5V
Auto-Recovery
DET OVP
I
RT
5V
I
DET
0.7V
100µA
0.8V
t
OFF-MIN
+9µs
Auto-Recovery
Debounce
Time
DRV
S
SET
Q
8
R
CLR
Q
17.5V
Auto-Recovery
Brownout
Protection
(RT Pin) Prog. OTP
(RT Pin) Externally Triggering
DET Pin OVP
VDD Pin OVP
Internal OTP
Startup
Auto-
Recovery
Protection
V
B
& Clamp
1
V
comp
to 1.6V
1.2V
V
INV
1V/1.2V
Brownout
Comparator
Debounce
100mS
100µs
PFC RANGE Control
Internal
OTP
Auto-Recovery
0.5V
Prog. OTP
10ms
Debounce
9
12
/ Externally Triggering
13
2.4V/2.25V
PFC Burst Mode
ZCD
OPWM
RANGE
GND
RT
VIN
Figure 2. Functional Block Diagram
© 2010 Fairchild Semiconductor Corporation
FAN6920MR • Rev. 1.0.3
3
www.fairchildsemi.com
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