參數(shù)資料
型號: L6563A
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 0.003 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDSO14
封裝: LEAD FREE, SOP-14
文件頁數(shù): 17/39頁
文件大?。?/td> 745K
代理商: L6563A
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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