參數(shù)資料
型號(hào)： L5980TR
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.6 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(yè)數(shù)： 11/42頁(yè)
文件大?。?/td> 1188K
代理商： L5980TR
L5980
Application information
Doc ID 13003 Rev 6
19/42
Equation 13
where:
Equation 14
Equation 15
As seen in Chapter 4.3 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.
5.4.1
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
π * ESR * C
OUT < 1/BW), the type III
compensation network is needed. Multi layer ceramic capacitors (MLCC) have very low ESR
(< 1 m
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 16
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(guān)PDF資料
PDF描述
L5983 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
L5983TR 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
L5986A 3.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
L5986ATR 3.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
L5986TR 3.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5980TR-CUT TAPE 制造商:ST 功能描述:L5980 Series 15 V 250 kHz 0.7 A Step Down Switching Regulator - VFQFPN-8
L5981 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1A 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
L5981_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 A step-down switching regulator
L5981TR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1a Step-Down Switching 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
L5983 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1.5A STEP-DOWN 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
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