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L7986TA 데이터시트(PDF) 25 Page - STMicroelectronics

부품명 L7986TA
상세설명  3 A step-down switching regulator
PDF  43 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L7986TA 데이터시트(HTML) 25 Page - STMicroelectronics

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L7986TA
Application information
Doc ID 022098 Rev 3
25/43
Figure 13.
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 follows:
1.
Choose a value for R1, usually between 1 kΩ and 5 kΩ, in order to have values of C4
and C5 not comparable with parasitic capacitance of the board.
2.
Choose a gain (R4/R1) in order to have the required bandwidth (BW), that means:
Equation 30
where fESR is the ESR zero:
Equation 31
and Vs is the sawtooth amplitude. The voltage feed-forward keeps the ratio Vs/Vin constant.
3.
Calculate C4 by placing the zero one decade below the output filter double pole:
Equation 32
R
4
f
ESR
f
LC
-------------
⎝⎠
⎜⎟
⎛⎞
2
BW
f
ESR
-------------
V
S
V
IN
---------
R
1
⋅⋅
⋅
=
f
ESR
1
2
π ESR C
OUT
⋅⋅
---------------------------------------------------
=
C
4
10
2
π R
4
f
LC
⋅⋅
-------------------------------------
=



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