參數(shù)資料
型號(hào)： L6911C
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封裝： SO-20
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 370K
代理商： L6911C
Obsolete
Product(s)
- Obsolete
Product(s)
13/20
L6911C
Where
Where ZC(s) and ZL(s) are the output capacitor and inductor impedance respectively.
The expression of ZI(s) may be simplified as follow:
Where:
τ1 = R4×C20, τ2 = (R4+R3)×C20 and τd = Rd×C25.
The regulator transfer function became now:
Figure 8 shows a method to select the regulator components (please note that the frequencies fEC and fCC cor-
responds to the singularities introduced by additional ceramic capacitors in parallel to the output main electro-
lytic capacitor).
s
To obtain a flat frequency response of the output impedance, the droop time constant
τd has to be equal
to the inductor time constant (see the note at the end of the section):
s
To obtain a constant -20dB/dec Gloop(s) shape the singularity f1 and f2 are placed in proximity of fCE
and fLC respectively. This implies that:
s
To obtain a Gloop bandwidth of fC, results:
Note.
To understand the reason of the previous assumption, the scheme in figure 9 must be considered.
In this scheme, the inductor current has been substituted by the load current, because in the frequencies range
of interest for the Droop function these current are substantially the same and it was supposed that the droop
network don't represent a charge for the inductor.
Gloo p s
()
Av s
() Rs
()
Av s
()
Zf s
()
Zi s
()
--------------
==
Av s
()
Vi n
V
osc
----------------
Z
C s
()
Z
C s
() Z
L s
()
+
-------------------------------------
=
Z
I s
()
Rd
1
s
--- C25
Rd
1
s
---
+
C25
----------------------------------
R4
1
s
--- C20
+
R3
R4
1
s
---
C20
+
R3
+
------------------------------------------------------
+
Rd 1
s
τ
1
τ
d
+
() s
2
R3
R
d
--------
τ
1
τ
d
+
+
1s
τ
2
+
() 1s τ
d
+
()
---------------------------------------------------------------------------------------------------
=
==
Rd
1s
R3
R
d
--------
τ
d
+
1s τ
1
+
()
1s
τ
2
+
() 1s τ
d
+
()
---------------------------------------------------------------------
=
Rs
()
1s
τ
2
+
() 1s τ
d
+
()
sC 18 R
d
1s
R3
R
d
--------
τ
d
+
1s
τ
1
+
()
--------------------------------------------------------------------------------------------------------
≈
τ
d
R
d
C25
L
R
L
-------
τ
L
C25
L
R
L
R
d
()
-----------------------
==
=
f
2
f
1
----
f
LC
f
CE
---------
R4
R3
f
LC
f
CE
---------
1
–
==
f1
f
CE
C20
1
2
---
π R4 f
CE
=
=
G
0
f
LC
1f
C
G
0
A
0
R
0
VIN
Vosc
------------------
C20 // C25
C18
-----------------------------
f
C
f
LC
--------
C 18
VIN
Vosc
------------------
C20 C25
C20
C25
+
-----------------------------
f
LC
f
C
--------
==
=
相關(guān)PDF資料
PDF描述
L6911DTR 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6911E 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6911ETR 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6924U013 POWER SUPPLY SUPPORT CKT, PQCC16
L6924U013TR POWER SUPPLY SUPPORT CKT, PQCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6911CTR 功能描述:DC/DC 開(kāi)關(guān)控制器 5B PROGRAMMABLE STEP DOWN CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6911D 功能描述:DC/DC 開(kāi)關(guān)控制器 5-Bit Prog Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6911DTR 功能描述:DC/DC 開(kāi)關(guān)控制器 5-Bit Prog Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6911E 功能描述:DC/DC 開(kāi)關(guān)控制器 5-Bit Prog Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6911E_07 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:5-Bit programmable step down controller with synchronous rectification
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*