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AN4213 bảng dữ liệu(PDF) 18 Page - STMicroelectronics

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AN4213 bảng dữ liệu(HTML) 18 Page - STMicroelectronics

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Designing a TM PFC
AN4213
18/42
DocID023984 Rev 2
Pin 3 (MULT): main input to the multiplier.
Figure 8. Multiplier setting
This pin is connected to the rectified mains voltage via a resistor divider and provides the
sinusoidal reference to the current loop.
The multiplier can be described by the relationship:
Equation 31
Where:
•
V
CS
(multiplier output) is the reference for the current sense
•
K = 0.38 (typ) is the multiplier gain
•
V
COMP
is the voltage on pin 2
•
V
MULT
is the voltage on pin 3
First, the maximum peak value for V
MULT
max is selected. This value has to be selected in
the range from 0 up to 3 V. Typically, it should be less than 3 V in case of single mains
Equation 32
where 1.1 V is the multiplier maximum slope which is given in the datasheet.
AM17322v1
Vin(Vac)
RMULTH
RMULTL
INV
1
COMP
2
3
MULT
4
CS
ZCD
GND
GD
VCC
5
6
7
8
L6562A
()
MULT
COMP
CS
V
V
V
K
V
∗
−
=
5
.
2
V
V
V
R
I
V
AC
AC
S
Lpk
MULTpk
21
.
1
185
265
1
.
1
47
.
0
99
.
1
1
.
1
min
max
max
=
∗
∗
=
∗
∗
=



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