參數(shù)資料
型號(hào)： L5988D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁(yè)數(shù)： 25/52頁(yè)
文件大?。?/td> 1858K
代理商： L5988D
L5988D
Application information
Doc ID 15324 Rev 3
31/52
1.
Choose a value for R1, usually between 1 kΩ and 5 kΩ.
2.
Choose a gain (R5/R8) in order to have the required bandwidth (BW), that means:
where K is the feed forward constant and 1/K is equals to 18.
3.
Calculate C5 by placing the zero at 50% of the output filter double pole frequency (fLC):
4.
Calculate C6 by placing the second pole at four times the system bandwidth (BW):
5.
Set also the fist pole at four times the system bandwidth and also the second zero at
the output filter double pole:
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW/3.5), anyway lower than 120kHz if the FSW is set higher than 500kHz.
For example with VOUT = 1.2 V, VIN = 12 V, IO = 4 A, L = 4.7 μH, COUT = 47 μF, the type III
compensation network is:
In Figure 15 is shown the module and phase of the open loop gain. The bandwidth is about
68 kHz and the phase margin is 50°.
R
5
BW
f
LC
----------
1
K
---- R
8
=
C
5
1
π R
5
f
LC
---------------------------
=
C
6
C
5
2
π R
5
C
5
4BW
1
–
--------------------------------------------------------------
=
R
7
R
8
4BW
f
LC
-----------------
1
–
---------------------------
=
C
7
1
2
π R
7
4BW
-----------------------------------------
=
,
R
8
4.7k
Ω
=
R
6
4.7k
Ω
=
R
7
56
Ω
=
R
5
1.2K
Ω
=
C
7
10nF
=
C
5
22nF
=
C
6
1nF
=
,,
,
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