參數(shù)資料
型號(hào)： L5986TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 3.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFP-8
文件頁(yè)數(shù)： 13/38頁(yè)
文件大?。?/td> 1067K
代理商： L5986TR
Application information
L5986
20/38
Doc ID 14971 Rev 3
Equation 18
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 19
4.
Calculate C5 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
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 = 2.5 A, L=12μH, COUT = 22 μF, ESR < 1 mΩ,
the type III compensation network is:
In Figure 12 is shown the module and phase of the open loop gain. The bandwidth is about
71 kHz and the phase margin is 48°.
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
180
Ω
=
R
4
3.9k
Ω
=
C
3
3.3nF
=
C
4
10nF
=
C
5
150pF
=
,,
,
相關(guān)PDF資料
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L5986 3.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5987 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3 A buck switching regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
L5987A 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3 A STEP-DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
L5987ATR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 Step-down switch regulator, 3A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
L5987TR 功能描述:直流/直流開(kāi)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(kāi)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
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