參數(shù)資料
型號(hào)： L5987ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 4.4 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝： ROHS COMPLIANT, HSOP-8
文件頁(yè)數(shù)： 16/41頁(yè)
文件大?。?/td> 1002K
代理商： L5987ATR
L5987
Application information
Doc ID 14972 Rev 3
23/41
Equation 22
where K is the feed forward constant and 1/K is equals to 9.
3.
Calculate C4 by placing the zero at 50% of the output filter double pole frequency (fLC):
Equation 23
4.
Calculate C5 by placing the second pole at four times the system bandwidth (BW):
Equation 24
5.
Set also the first pole at four times the system bandwidth and also the second zero at
the output filter double pole:
Equation 25
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW/3.5), anyway lower than 100 kHz if the FSW is set higher than 500 kHz.
For example with VOUT = 3.3 V, VIN = 12 V, IO = 3 A, L = 10 μH, COUT = 22 μF, ESR < 1 mΩ,
the type III compensation network is:
In Figure 13 is shown the module and phase of the open loop gain. The bandwidth is about
71 kHz and the phase margin is 46°.
R
4
BW K
f
LC
------------------ R
1
=
C
4
1
π R
4
f
LC
---------------------------
=
C
5
C
4
2
π R
4
C
4
4BW
1
–
--------------------------------------------------------------
=
R
3
R
1
4BW
f
LC
-----------------
1
–
---------------------------
=
C
3
1
2
π R
3
4BW
-----------------------------------------
=
,
R
1
4.99k
Ω
=
R
2
1.1k
Ω
=
R
3
220
Ω
=
R
4
3.3k
Ω
=
C
3
3.3nF
=
C
4
10nF
=
C
5
180pF
=
,,
,
相關(guān)PDF資料
PDF描述
L5991D 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
L5991AD13TR 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
L5991A 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16
L5993D013TR 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
L5993 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDIP16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5987TR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3 A Step-down Switch 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
L5988 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4A step-down switching regulator with synchronous rectification
L5988D 功能描述:直流/直流開關(guān)調(diào)節(jié)器 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
L5988DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns 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
L5989D 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw 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
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