參數(shù)資料
型號： L7980
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFPN-8
文件頁數(shù)： 13/44頁
文件大小： 1247K
代理商： L7980
Application informations
L7980
20/44
Doc ID 15181 Rev 3
Equation 16
where:
Equation 17
Equation 18
As seen in Chapter 5.3 two different kind of network can compensate the loop. In the two
following paragraph the guidelines to select the Type II and Type III compensation network
are illustrated.
6.4.1
Type III compensation network
The methodology to stabilize the loop consists of placing two zeros to compensate the effect
of the LC double pole, so increasing phase margin; then to place one pole in the origin to
minimize the dc error on regulated output voltage; finally to place other poles far away the
zero dB frequency.
If the equivalent series resistance (ESR) of the output capacitor introduces a zero with a
frequency higher than the desired bandwidth (that is: 2
πESRCOUT<1/BW), the type III
compensation network is needed. Multi layer ceramic capacitors (MLCC) have very low ESR
(<1m
Ω), with very high frequency zero, so type III network is adopted to compensate the
loop.
In Figure 10 the type III compensation network is shown. This network introduces two zeros
(fZ1, fZ2) and three poles (fP0, fP1, fP2). They expression are:
Equation 19
G
LC s
()
1
s
2
π f
zESR
--------------------------
+
1
s
2
π Qf
LC
----------------------------
s
2
π f
LC
-------------------
2
++
-------------------------------------------------------------------------
=
f
LC
1
2
π
LC
OUT
1
ESR
R
OUT
---------------
+
------------------------------------------------------------------------
=
f
zESR
1
2
π ESR C
OUT
--------------------------------------------
=
,
Q
R
OUT
LC
OUT
R
OUT
ESR
+
()
LC
OUT
R
OUT
ESR
+
------------------------------------------------------------------------------------------
R
OUT
V
OUT
I
OUT
--------------
=
,
=
f
Z1
1
2
π C
3
R
1
R
3
+
()
------------------------------------------------
=
f
Z2
1
2
π R
4
C
4
------------------------------
=
,
相關PDF資料
PDF描述
L7980TR 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
L7981ATR SWITCHING REGULATOR, DSO8
L7981TR SWITCHING REGULATOR, DSO8
L8219LP STEPPER MOTOR CONTROLLER, 2.5 A, PDSO28
L8219P STEPPER MOTOR CONTROLLER, 2.5 A, PDSO36
相關代理商/技術參數(shù)
參數(shù)描述
L7980A 制造商:STMicroelectronics 功能描述:Conv DC-DC Single Step Down 4.5V to 28V 8-Pin HSOP EP Tube 制造商:STMicroelectronics 功能描述:POWER CONVERSION - Rail/Tube 制造商:STMicroelectronics 功能描述:2A Step-Down Reg 2.5A 4.5 28V 250kHz 制造商:STMicroelectronics 功能描述:BUCK, 4.5-28V, 2A, 1MHZ, 0.6-28V, 8HSOP; Primary Input Voltage:28V; No. of Outputs:1; Output Current:2A; Voltage Regulator Case Style:HSOP; No. of Pins:8; Operating Temperature Min:-25C; Operating Temperature Max:125C; MSL:MSL 3 - ;RoHS Compliant: Yes 制造商:ST 功能描述:0
L7980ATR 功能描述:直流/直流開關轉換器 2 A Step-Down Reg 4.5V to 28V 250 kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
L7980TR 功能描述:直流/直流開關轉換器 2A DC 4.5 V to 28 V Adj 0.6V 250 kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT
L7981 功能描述:直流/直流開關調(diào)節(jié)器 3A Step-Down Reg 3A DC 4.5-28V 250Khz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L7981A 制造商:STMicroelectronics 功能描述:POWER CONVERSION - Rail/Tube 制造商:STMicroelectronics 功能描述:3A Step-Down Reg 3.7A 4.5 to 28V 1MHz 制造商:ST 功能描述:3A STEP-DOWN SWITCHING REGULATOR
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*