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L6566A

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P52
L6566A Application information
Doc ID 13794 Rev 4 43/52
It is worth remembering that “auto-restart” means that the device works intermittently as
long as the condition that is activating the function is not removed; “latched” means that the
device is stopped as long as the unit is connected to the input power source and the unit
must be disconnected for some time from the source in order for the device (and the unit) to
restart. Optionally, a restart can be forced by pulling the voltage of pin 16 (AC_OK) below
0.45 V.
Application examples and ideas L6566A
44/52 Doc ID 13794 Rev 4
6 Application examples and ideas
Figure 28. Typical low-cost application schematic
PFC Pre-regulator Output bus
IC1
L6566A
C3
Q1
R2
D2
R8
C9
D1
C7 2.2 nF Y1
R9
R10
C8A,B
T1
ZCD
GD
CS
VccAC_OK
GND
VFF
COMP
D4
IC3
R4
D3
1
2
3
4
C6
R5
C2
SS
C5
VREFMOD E/ S C
C4 R6
HVSFMOD
OSC
DIS
TL431
R1
R3 470k
R7
Vout
Optional f or
QR operation
4
7
3
5
11
15
16
91413
8
1012
16
Optional f or
QR operation
Output capacitor of boost
PFC Pre-regulator
Figure 29. Typical full-feature application schematic (QR operation)
4
7
3
5
11
6
8
IC1
L6566A
Vout
9
R4
C3
Q1
R2
D2
1N4148
R18
D1
C7 2.2 nF Y1
C8A,B
T1
ZCD
GD
CS
Vcc
DIS
GND
VFF
COMP
D4
IC3 PC817A
R3
D3 1N4148
3
4
C6
R5
C2
14
SS
13
C5
16
10
VREF
12
MODE/ SC
C4 R6
1
HVS
OSC
AC_OK
R1
R12
R1
3
R1
4
R8
C9
R9
R10
1
2
TL431
R7
NTC2
Vcc_PFC
to Vcc pin of
PFC controller
15
C1
PFC Pre-regulator Output bus
Output c apacitor of boos t
PFC Pre-regulator
to mains
v oltage sensing
L6566A Application examples and ideas
Doc ID 13794 Rev 4 45/52
Figure 30. Typical full-feature application schematic (FF operation)
4
7
3
5
11
6
8
IC1
L6566A
Vout
9
C3
Q1
R2
D2
1N4148
R18
D1
C7 2.2 nF Y1
C8A,B
T1
ZCD
GD
CS
Vcc
DIS
GNDCOMP
D4
IC3 PC817A
R3
R4
D3 1N4148
3
4
C6
R5
C2
14
SS
13
C5
10
VREF
12
MODE/ SC
C4 R6
1
HVS
OSC
R1
R12
R1
3
R1
5
R16
R17
R8
C9
R9
R10
1
2
TL431
R7
NTC2
Vcc_PFC
to Vcc pin of
PFC controller
C1
PFC Pre-regulator Output bus
Output capacitor of boost
PFC Pre-regulator
VFF
16
AC_OK
15
to mains
v oltage sensing
Table 7. External circuits that determine IC behavior upon OVP and OCP
OVP latched OVP auto-restart
OCP latched
OCP auto-restart
L6566A
VFF
15
R
L
RFF
RH
R
FF
needed if R
L
< 4.7 k
Ω
SS VREF
14 10
L6566A
AC_OK
16
R
H
VFF
15
R
L
Diode needed if R
L
> 4.7 k
Ω
SS VREF
14 10
L6566A
SS VREF
14 10
1N4148
VFF
15
R
L
RFF
R
H
RFF needed if RL < 4.7 k
Ω
L6566A
16
15
SS VREF
14 10
1N4148
AC_OK
R
H
VFF
RL
Diode needed if RL > 4.7 k
Ω
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P52

L6566A

Mfr. #:
Buy L6566A
Manufacturer:
STMicroelectronics
Description:
Power Factor Correction - PFC Multi Mode PWM Controller
Lifecycle:
New from this manufacturer.
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