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AN3027 датащи(PDF) 29 Page - STMicroelectronics

номер детали AN3027
подробное описание детали  How to design a transition-mode PFC pre-regulator
PDF  41 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3027 датащи(HTML) 29 Page - STMicroelectronics

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AN3027
Designing a TM PFC
Doc ID 16134 Rev 4
29/41
Equation 63
and check that at minimum mains voltage Vin1 the peak voltage on pin #3 is greater than
0.9 V.
3.
Determine RoutH, the upper resistor of the output divider, for instance 3 MΩ.
4.
Calculate the lower resistor RoutL of the output divider and the adjustment resistor RT:
Equation 64
Equation 65
5.
Check that the maximum current sourced by the TBO pin (pin #6) does not exceed the
maximum specified (0.25 mA):
Equation 66
The circuit illustrated in
Figure 16 shows the internal block diagram of the tracking boost
function.
Figure 16.
Tracking boost block diagram
(24)
inx
V
2
3
k
⋅
=
outH
R
1
in
2
O
2
in
1
O
1
in
2
in
outH
outL
V
)
V
5
.
2
V
(
V
)
V
5
.
2
V
(
V
V
R
V
5
.
2
R
⋅
−
−
⋅
−
−
⋅
=
1
O
2
O
1
in
2
in
outH
T
V
V
V
V
R
2
k
R
−
−
⋅
⋅
⋅
=
T
max
TBO
R
3
I
=



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