參數(shù)資料
型號(hào)： L5985TR
廠商： 意法半導(dǎo)體
英文描述： 2A step-down switching regulator
中文描述： 第2A降壓型開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 23/36頁(yè)
文件大?。?/td> 757K
代理商： L5985TR
L5985
Application informations
23/36
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, in order to have values of C4 and
C5 not comparable with parasitic capacitance of the board.
2.
Choose a gain (R
4
/R
1
) in order to have the required bandwidth (BW), that means:
Equation 22
Where f
ESR
is the ESR zero:
Equation 23
and Vs is the saw-tooth amplitude. The voltage feed forward keeps the ratio Vs/Vin constant.
3.
Calculate C
4
by placing the zero one decade below the output filter double pole:
Equation 24
4.
Then calculate C
3
in order to place the second pole at four times the system bandwidth
(BW):
Equation 25
For example with V
OUT
= 3.3V, V
IN
= 12V, I
O
= 2A, L = 15
μ
H, C
OUT
= 330
μ
F, ESR = 50m
,
the type II compensation network is:
Equation 26
In
Figure 15
is shown the module and phase of the open loop gain. The bandwidth is about
37kHz and the phase margin is 46°.
R
4
f
f
LC
-----------
2
f
ESR
-----------
V
S
V
IN
--------
R
1
=
f
ESR
2
π
ESR C
OUT
-------------------------------------------
=
C
4
2
π
R
4
f
LC
------------------------------
=
C
5
C
2
π
R
4
C
4
4 BW
1
–
-------------------------------------------------------------
=
R
1
1.1k
=
R
2
249
=
R
4
10k
=
C
4
68nF
=
C
5
68pF
=
,
,
,
,
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