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參數(shù)資料
| 型號： | L7981ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, DSO8 |
| 封裝： | 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, HSOP-8 |
| 文件頁數(shù)： | 13/44頁 |
| 文件大?。?/td> | 1315K |
| 代理商： | L7981ATR |
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Application informations
L7981
20/44
Doc ID 15182 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
------------------------------
=
,
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| L7981ATR/BLK | 制造商:STMicroelectronics 功能描述:3 A STEP-DOWN SWITCHING REGULATO - Tape and Reel 制造商:STMicroelectronics 功能描述:STMicroelectronics L7981ATR/BLK Interface Misc |
| L7981TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A DC 4.5 V to 28 V Adj 0.6V 250 kHz 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L7983 | 制造商:Leviton Manufacturing Co 功能描述: |
| L7985 | 功能描述:線性穩(wěn)壓器 - 標準 2A Step Down REG 4.5V to 38V 250 KHz RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L7985A | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2A DC 4.5V to 38V 250 KHz Step-Down 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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