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AN4213 Datasheet(PDF) 13 Page - STMicroelectronics

Part # AN4213
Description  Fluorescent lamps are increasingly driven by electronic
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4213 Datasheet(HTML) 13 Page - STMicroelectronics

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DocID023984 Rev 2
13/42
AN4213
Designing a TM PFC
The switching frequency is minimum at the top of the sinusoid
and it is maximum at the zero-crossing of the line voltage (
ϑ
=0,
π
= sin
ϑ
=0) where
t
off
= 0 μs.
The absolute minimum frequency f
SWmin
can occur at either the maximum V
ACmax
or the
minimum mains voltage V
ACmin
, so the inductor value is calculated by the formula:
Equation 18
where V
AC
can be either V
ACmin
or V
ACmax
, whichever gives the lower value for L.
The values of the inductor at low mains and at high mains, respectively L(V
ACmax
) and
L(V
ACmin
) are given by following equations:
Equation 19
Equation 20
At this point the minimum value has to be taken into account. It becomes the maximum
inductance value for PFC dimensioning.
For this application a 0.5 mH boost inductance has been selected.
3.3.5
Power MOSFET selection
The main switch selection is driven by the amount of allowable power dissipation. It is
important to choose a device that minimizes gate charge and capacitance and minimizes
the sum of switching and conduction losses at a given frequency.
The breakdown voltage is fixed just by the output voltage, plus the allowable overvoltage
and a safety margin.
The conduction losses are given by:
Equation 21
=
=
1
sin
2
ϑ
π
ϑ
()
()
2
*
2
*
2
AC
OUT
AC
AC
V
V
V
V
L
−
=
()
() ()
()
mH
V
L
V
P
f
V
V
V
V
L
AC
OUT
IN
SW
AC
OUT
AC
AC
36
.
1
400
*
129
*
10
*
35
*
2
185
*
2
400
*
185
*
*
*
2
*
2
*
3
2
max
min
min
2
min
max
=
−
=
−
=
()
() ()
()
mH
V
L
V
P
f
V
V
V
V
L
AC
OUT
IN
SW
AC
OUT
AC
AC
51
.
0
400
*
129
*
10
*
35
*
2
265
*
2
400
*
265
*
*
*
2
*
2
*
3
2
max
min
max
2
max
min
=
−
=
−
=
()
()2
*
AC
SWrms
DSon
COND
V
I
R
P
=



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