參數(shù)資料
型號: L6563_07
廠商: 意法半導(dǎo)體
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: Advanced transition-mode PFC controller
中文描述: 先進(jìn)的過渡模式PFC控制器
文件頁數(shù): 24/39頁
文件大?。?/td> 565K
代理商: L6563_07
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 Vin
clamp
that produces Vo = Vox:
Equation 6
and choose a value Vin
x
such that Vin
2
= Vin
x
< Vin
clamp
. This will result in a limitation of the
output voltage range below Vox (it will equal Vox if one chooses Vin
x
= Vin
clamp
)
2.
Determine the divider ratio of the MULT pin (pin 3) bias:
Equation 7
and check that at minimum mains voltage Vin
1
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 R
2
of the output divider and the adjustment resistor R
T
:
Equation 9
Vin
clamp
Vox
Vo
2
1
Vo
1
-----------–
Vin
2
Vox
Vo
2
2
Vo
1
-----------–
Vin
1
=
k
2 Vin
x
-----------------------
=
R1
20
----------
10
6
=
R2
2.5 R1
Vin
Vin
Vo
2
Vo
1
Vin
Vo
2
2.5
(
)
Vin
2
1
Vo
1
2.5
(
)
Vin
1
------------------------------------------------–
=
R
T
2 k R1
--------------–
=
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