參數(shù)資料
型號(hào)： L6727
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, SOP-8
文件頁(yè)數(shù)： 8/34頁(yè)
文件大?。?/td> 974K
代理商： L6727
Application details
L6727
16/34
Doc ID 12933 Rev 4
Compensation goal is to close the control loop assuring high DC regulation accuracy, good
dynamic performances and stability. To achieve this, the overall loop needs high DC gain,
high bandwidth and good phase margin.
High DC gain is achieved giving an integrator shape to compensation network transfer
function. Loop bandwidth (F0dB) can be fixed choosing the right RF/RFB ratio, however, for
stability, it should not exceed FSW/2π. To achieve a good phase margin, the control loop gain
has to cross 0dB axis with -20 dB/decade slope.
As an example, Figure 7 shows an asymptotic bode plot of a type III compensation.
Figure 7.
Example of type III compensation.
●
Open loop converter singularities:
a)
b)
●
Compensation Network singularities frequencies:
a)
b)
c)
d)
Gain
[dB]
Log (Freq)
0dB
open loop
EA gain
closed
loop gain
compensation
gain
open loop
converter gain
F
LC
F
ESR
F
Z1 FZ2
F
P1
F
P2
20log (R
F/RFB)
20log (V
IN/ΔVOSC)
F
0dB
F
LC
1
2
π LC
OUT
----------------------------------
=
F
ESR
1
2
π C
OUT
ESR
--------------------------------------------
=
F
Z1
1
2
π R
F
C
F
------------------------------
=
F
Z2
1
2
π R
FB
R
S
+
() C
S
-----------------------------------------------------
=
F
P1
1
2
π R
F
C
F
C
P
C
F
C
P
+
---------------------
--------------------------------------------------
=
F
P2
1
2
π R
S
C
S
-------------------------------
=
相關(guān)PDF資料
PDF描述
L6728AHTR SWITCHING CONTROLLER, PDSO10
L6730DTR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6730D 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6730CQTR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, QCC24
L6730CTR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6727_10 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller
L6727TR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Single PWM controler RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6728 功能描述:DC/DC 開關(guān)控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
L6728_0706 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller with Power Good
L6728A 功能描述:電壓模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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