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AN4213 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

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Designing a TM PFC
AN4213
20/42
DocID023984 Rev 2
The maximum main-auxiliary winding turn ratio, nmax, has to ensure that the voltage
delivered to the pin during the OFF-time of the Power MOSFET is sufficient to arm the ZCD
circuit.
Equation 36
The minimum value of the limiting resistor can be found assuming 0.8 mA current through
the pin and considering the maximum voltage across the auxiliary winding with a selected
turn ratio n = 10. The actual value can be fine-tuned in order to make the turn-on of the
Power MOSFET occur exactly on the valley of the drain voltage oscillation (the boost
inductor, completely discharged, is ringing with the drain capacitance, as shown in the figure
below). This will minimize the power dissipation at turn-on.
Figure 10. Optimum Power MOSFET turn-on
Equation 37
Equation 38
7
.
15
15
.
1
4
.
1
2
max
sec
≤
∗
−
≤
≤
n
V
V
n
n
n
AC
OUT
ondary
primary
AM17324v1
Vout
Vdrain
Vipk
Vzcd
5.7
0.7
1.4
t
t
Ω
=
−
=
−
=
k
mA
mA
V
n
V
R
ZCDH
out
9
.
42
8
.
0
7
.
5
10
400
8
.
0
1
Ω
=
−
∗
=
−
=
k
mA
mA
V
n
V
R
ZCDL
AC
8
.
46
8
.
0
0
10
265
2
8
.
0
2
max
2



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