參數(shù)資料
型號: L5980TR
廠商: 意法半導體
英文描述: 0.7A step-down switching regulator
中文描述: 0.7A的降壓開關穩(wěn)壓器
文件頁數(shù): 20/37頁
文件大?。?/td> 959K
代理商: L5980TR
Application informations
L5980
20/37
Figure 11.
Open loop gain: module Bode diagram
The guidelines for positioning the poles and the zeroes and for calculating the component
values can be summarized as follow:
1.
Choose a value for R
1
, usually between 1k
and 5k
.
2.
Choose a gain (R
4
/R
1
) in order to have the required bandwidth (BW), that means:
Equation 18
where K is the feed forward constant and 1/K is equals to 9.
3.
Calculate C
4
by placing the zero at 50% of the output filter double pole frequency (f
LC
):
Equation 19
4.
Calculate C
5
by placing the second pole at four times the system bandwidth (BW):
Equation 20
5.
Set also the first pole at four times the system bandwidth and also the second zero at
the output filter double pole:
R
4
f
LC
---------
1
K
---
R
1
=
C
4
π
R
4
f
LC
---------------------------
=
C
5
C
2
R
4
C
4
4 BW
1
-------------------------------------------------------------
=
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