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AN4213 bảng dữ liệu(PDF) 12 Page - STMicroelectronics

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AN4213 bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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Designing a TM PFC
AN4213
12/42
DocID023984 Rev 2
C
IN
has been selected equal to 150 nF.
Of course a bigger capacitor provides a benefit in terms of EMI, but on the other hand
worsens the THD, mainly at high mains voltage. For this reason the right trade-off is needed
in order to have the best performance. A good quality film capacitor must be selected in
order to provide good filtering effectiveness.
3.3.3
Output capacitor
The selection of the output bulk capacitor C
OUT
depends on the DC output voltage, the
allowable overvoltage and the converter output power. With these values, the output
capacitor can be calculated using the following equation:
Equation 14
To obtain the smallest possible ripple and good reliability, a commercial capacitor of 56μF,
450 V has been selected.
3.3.4
Boost inductor
In the transition mode control, the inductor value needs to be calculated to start the next
switching cycle at zero current. The boost inductor determines the operating frequency of
the converter. First, the inductance value must be defined. The inductance (L) is usually
determined so that the minimum switching frequency is greater than the maximum
frequency of the L6562A internal starter, in order to ensure correct TM operation.
Assuming unity PF, it is possible to write:
Equation 15
Equation 16
T
on
and T
off
are, respectively, the ON-time and the OFF-time of the Power MOSFET, I
Lpk
is
the maximum peak inductor current in a line cycle and
θ is the instantaneous line phase in
the interval (0,
π
).
The instantaneous switching frequency in a line cycle is given by
Equation 17:
Equation 17
F
V
V
f
P
C
OUT
OUT
main
OUT
OUT
μ
π
π
49
10
*
400
*
47
*
4
116
*
*
4
≥
=
Δ
≥
()
AC
Lpk
AC
Lpk
AC
on
V
I
L
V
I
L
V
t
*
2
*
sin
*
*
2
sin
*
*
,
=
=
ϑ
ϑ
ϑ
()
ϑ
ϑ
ϑ
sin
*
*
2
sin
*
*
,
AC
OUT
Lpk
AC
off
V
V
I
L
V
t
−
=
()
()
OUT
AC
OUT
AC
IN
off
on
AC
SW
V
V
V
V
P
L
t
t
V
f
ϑ
ϑ
sin
*
*
2
*
*
*
2
1
1
,
2
−
=
+
=



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