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AN3142 Datasheet(PDF) 24 Page - STMicroelectronics

Part # AN3142
Description  Solution for designing a 400 W fixed-off-time controlled
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3142 Datasheet(HTML) 24 Page - STMicroelectronics

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Designing a fixed-off-time PFC
AN3142
24/44
Doc ID 17005 Rev 3
A complete description is given by the diagram in
Figure 14 and 15 which shows the typical
multiplier characteristics family. The linear operation of the multiplier is guaranteed within the
range 0 to 3 V of VMULT and the range 0 to 1.16 V (typ.) of Vcs, while the minimum
guaranteed value of the maximum slope of the characteristics family (typ.) is:
Equation 48
The voltage on the MULT pin is used also to derive the information on the RMS mains
voltage for the VFF compensation.
The suggested procedure to properly set the operating point of the multiplier is now
described. First, the maximum peak value for VMULT, VMULTmax is selected. This value,
which occurs at maximum mains voltage, should be 3 V or thereabouts in wide range mains
and less in the case of single mains. The sense resistor selected is Rs = 0.12
Ω and it is
described in the pin #4 section. According to the L6563S datasheet and to the linearity
setting of the pin, the maximum voltage accepted on the multiplier input is:
Where ILpk and Rs have been already calculated, 1.66 is the Multiplier maximum slope,
reported on the datasheet.
From
15 the maximum required divider ratio is calculated as:
Equation 49
Figure 14.
Multiplier characteristics family for
VFF =1 V
Figure 15.
Multiplier characteristics family for
VFF=3 V
Multiplier Char ac ter istics @ VFF=1 V
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
0
0 .1
0 .2
0.3
0.4
0 .5
0.6
0.7
0 .8
0.9
1
1.1
VMU LT (V)
4.5V
3.5V
Uppe r voltage clamp
3. 0V
2. 6V
5.0V
4.0V
5.5
VC OMP
Multiplier characteristics @VFF = 3V
0
10 0
20 0
30 0
40 0
50 0
60 0
70 0
00 .5
1
1.522.5
33.5
VMU LT (V )
2.6V
3.0V
4.5V
4.0V
3.5V
5.0V
5.5V
Upper voltage
VCOMP
V
V
66
.
1
dV
dV
MULT
CS
=
V
3
VMULT
max =
(15)
`
10
8
Vac
265
2
V
00
.
3
VAC
2
V
k
3
max
max
MULT
p
−
⋅
=
⋅
=
⋅
=



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