參數(shù)資料
型號(hào): L5985
廠商: 意法半導(dǎo)體
英文描述: 2A step-down switching regulator
中文描述: 第2A降壓型開關(guān)穩(wěn)壓器
文件頁(yè)數(shù): 20/36頁(yè)
文件大?。?/td> 757K
代理商: L5985
L5985
Application informations
20/36
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:
Equation 21
R
4
f
LC
---------
1
K
---
R
1
=
C
4
R
4
f
LC
---------------------------
=
C
5
C
2
π
R
4
C
4
4 BW
1
-------------------------------------------------------------
=
R
3
R
f
LC
-----------------
1
--------------------------
=
C
3
2
π
R
3
4 BW
----------------------------------------
=
,
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5985_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A step-down switching regulator
L5985TR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5986 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.5 A buck switching regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5986A 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.5 A STEP-DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5986ATR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Step-down switch regulator, 2.5A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5