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19/42
AN4213
Designing a TM PFC
In this way, the resistor divider will be such that
Equation 33
supposing a 200 μA current flowing into the multiplier divider, R
MULTL
is calculated as
follows:
Equation 34
Taking into account this value and from
Equation 33:
Equation 35
The selected values are R
MULTL
= 8.2 k
Ω and R
MULTH
= 2 M
Ω
Pin 5 (ZCD): zero-current detection
Figure 9. ZCD resistor
The zero-current detection (ZCD) block switches the external Power MOSFET on as the
voltage across the boost inductor reverses, just after the current through the boost inductor
has gone to zero. This feature allows transition mode operation. The ZCD pin is connected
to the auxiliary winding of the inductor boost through a limiting resistor.
3
max
max
10
24
.
3
265
41
.
1
21
.
1
2
−
∗
=
∗
=
=
+
=
AC
MULT
MULTH
MULTL
MULTL
p
V
V
R
R
R
k
Ω
=
∗
=
=
−
k
A
V
R
MULT
MULTL
2
.
6
10
200
21
.
1
200
6
μ
Ω
=
−
=
M
R
K
K
R
MULTL
P
P
MULTH
9
.
1
1
AM17323v1
Vin(Vac)
RMULTH
RMULTL
INV
1
COMP
2
3
MULT
4
CS
ZCD
GND
GD
VCC
5
6
7
8
L6562A



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