參數(shù)資料
型號： L6917D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28
封裝： SO-28
文件頁數(shù)： 11/27頁
文件大?。?/td> 411K
代理商： L6917D
19/27
L6917
Figure 12. Current loop Gain (left) and Voltage loop Gain (right)
The RF CF network may be designed considering the desired crossover frequency ωTI as follow:
s
Assuming that
ωF = ωLC, and that ZF=RF if ω>ωF, it can be observed that:
s
Given the cross-over frequency
ωTI, it results:
s
Since
ωF=ωLC:
Since the device works in current mode and then the control loop acts to control the current, the highest is
ωTI,
the fastest is the device to react after a load transient. The placement of this singularity must consider the worst
case for the load and precisely the maximum output current (minimum output resistance ROUT).
The voltage loop gain may be expressed by the following relationship:
Assuming that GLOOPI>>1 and after substitution and simplification the final expression for GLOOPV is given by:
Where the additional pole placed at the current loop
ωTI must be inserted to consider that the current loop gain
is not always GLOOPI>>1. The LC resonance disappears thanks to the average current mode control and the
system is automatically stable if ESR is small enough.
Since all the above modeling are valid at frequencies much lower than the switching frequency, the highest is
this, the highest may be the converter’s loop bandwidth (both current and voltage). In this way the converter is
able to fast react after a load transient following, with the current delivered by the inductors, the current required
by the load minimizing the number of the output capacitor required.
The average current mode compensation network is then designed as follow:
ω
OUT
ω
TI
ω
ESR
ω
dB
ω
TV
FB
R
Rs
Rg
Ro
ω
OUT
ω
F
ω
LC
ω
dB
ZF
Ac
GLOOPI
ω
TI
G
LOOP I ω =ωLC
()
V
IN
R
F
R
S
Ro
Vos c
Rg
-------------------------------------------
ω
LC
ω
O
----------
=
R
F
Rg
Rs
--------
Ro
Vos c
Vin
-------------------------------
ω
o
ω
TI
ω
LC
2
--------------------
Rg
Rs
--------
Ro
Vosc
Vi n
-------------------------------
LC
OUT
ω
TI
2
-------------------------------------
Ro C
OUT
-------------------------------------
Rg
Rs
--------
Vos c
Vin
------------------
L
2
ω
TI
----------------
==
=
C
F
C
OUT
L
2
---
R
F
---------------------------
=
G
LOOP V s
()
V
OUT
V
CO MP
-------------------
V
COM P
V
OUT
-------------------
Av s
()
–
1
Vosc
------------------
1G
LOOP I
+
-------------------------------
Z
F s
()
R
FB
---------------
==
G
LOO P V s
()
...
{}
1
s ESR C
OU T
+
1s R
OU T COUT
+
----------------------------------------------------
R
OUT Rg
Rs R
FB
----------------------------
1
s
ω
TI
---------
+
-------------------
==
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6917DTR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
L6918 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918AD 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt 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 安裝風格: 封裝 / 箱體:CPAK
L6918ADTR 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt 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 安裝風格: 封裝 / 箱體:CPAK
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