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參數(shù)資料
| 型號： | L6918AD |
| 廠商： | 意法半導體 |
| 英文描述： | 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| 中文描述： | 5位可編程多相控制器 |
| 文件頁數(shù)： | 23/35頁 |
| 文件大小： | 760K |
| 代理商： | L6918AD |
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L6918 L6918A
AVERAGE CURRENT MODE (ACM) CONTROL LOOP
The average current mode control loop is reported in figure 15. The current information I
FB
sourced by the FB
pin flows into R
FB
implementing the dependence of the output voltage from the read current.
The ACM control loop gain results (obtained opening the loop after the COMP pin):
where:
–
is the equivalent output resistance determined by the droop function;
– Z
P
(s) is the impedance resulting by the parallel of the output capacitor (and its ESR) and the applied
load Ro;
– Z
F
(s) is the compensation network impedance;
– Z
L
(s) is the parallel of the two inductor impedance;
– A(s) is the error amplifier gain;
–
is the ACM PWM transfer function where
V
osc
is the oscillator ramp amplitude
and has a typical value of 2V
Removing the dependence from the Error Amplifier gain, so assuming this gain high enough, the control loop
gain results:
With further simplifications, it results:
Considering now that in the application of interest it can be assumed that Ro>>R
L
; ESR<<Ro and
R
DROOP
<<Ro, it results:
The ACM control loop gain is designed to obtain a high DC gain to minimize static error and cross the 0dB axes
with a constant -20dB/dec slope with the desired crossover frequency
ω
T. Neglecting the effect of Z
F
(s), the
transfer function has one zero and two poles. Both the poles are fixed once the output filter is designed and the
zero is fixed by ESR and the Droop resistance.
To obtain the desired shape an R
F
-C
F
series network is considered for the Z
F
(s) implementation.
A zero at
ω
f
=1/R
F
C
F
is then introduced together with an integrator. This integrator minimizes the static error
G
LOOP
s
( )
PWM Z
s
--------------------------------------------------------------------------------+
( )
R
Z
s
( )
)
Z
P
s
( )
Z
L
s
( )
+
(
)
--------------
1
-----------
+
R
FB
+
–
=
R
DROOP
----------------------
R
FB
=
PWM
4
5
--
V
OSC
------------------
=
G
LOOP
s
( )
4
5
--
V
OSC
------------------
Z
s
( )
P
s
L
-----------------+
-------
Z
s
( )
FB
--------------
+
–
=
G
LOOP
s
( )
4
5
--
V
OSC
------------------
Z
s
( )
FB
--------------
Ro
-------------------------------------
R
L
2
+
Ro
------
+
1
s Co
R
//Ro
ESR
+
(
)
+
s
2
Co
L
2
--
s
---------------
Co ESR
Co
L
2
------
+
+
1
+
+
----------------------------------------------------------------------------------------------------------------------------------
–
=
G
LOOP
s
( )
4
5
--
V
OSC
------------------
Z
s
( )
FB
--------------
1
s Co
R
ESR
+
(
)
+
s
2
Co
L
2
--
s
---------------
Co ESR
Co
L
2
------
+
+
1
+
+
----------------------------------------------------------------------------------------------------------------------------------
–
=
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|---|---|
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| L6919C | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6918ADTR | 功能描述:DC/DC 開關控制器 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 |
| L6918D | 功能描述:DC/DC 開關控制器 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 |
| L6918DTR | 功能描述:DC/DC 開關控制器 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 |
| L6919 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| L6919C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
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