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L6563 датащи(PDF) 24 Page - STMicroelectronics

номер детали L6563
подробное описание детали  Advanced transition-mode PFC controller
PDF  39 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6563 датащи(HTML) 24 Page - STMicroelectronics

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Application information
L6563 - L6563A
24/39
to set the output voltage at the desired values use the following design procedure:
1.
Determine the input RMS voltage Vinclamp that produces Vo = Vox:
Equation 6
and choose a value Vinx such that Vin2 = Vinx < Vinclamp. This will result in a limitation of the
output voltage range below Vox (it will equal Vox if one chooses Vinx = Vinclamp)
2.
Determine the divider ratio of the MULT pin (pin 3) bias:
Equation 7
and check that at minimum mains voltage Vin1 the peak voltage on pin 3 is greater than
0.65V.
3.
Determine R1, the upper resistor of the output divider:
Equation 8
4.
Calculate the lower resistor R2 of the output divider and the adjustment resistor RT:
Equation 9
Vin
clamp
Vox
Vo
1
–
Vo
2
Vo
1
–
--------------------------- Vin
2
Vox
Vo
2
–
Vo
2
Vo
1
–
--------------------------- Vin
1
⋅
–
⋅
=
k
3
2Vin
x
⋅
-----------------------
=
R1
Vo
∆
20
----------- 10
6
⋅
=
R2
2.5 R1
Vin
2
Vin
1
–
Vo
1
2.5
–
() Vin
2
Vo
2
2.5
–
() Vin
1
⋅
–
⋅
--------------------------------------------------------------------------------------------------
⋅
⋅
=
R
T
2kR1
Vin
2
Vin
1
–
Vo
2
Vo
1
–
------------------------------
⋅⋅
⋅
=



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