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參數(shù)資料
| 型號： | L6919CD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| 中文描述： | 5位可編程雙相與動態(tài)VID管理控制器 |
| 文件頁數(shù)： | 19/32頁 |
| 文件大?。?/td> | 558K |
| 代理商： | L6919CD |
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L6919C
–
· 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:
V
V
OSC
Z
P
s
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:
V
V
OSC
R
FB
s
2
Co
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 consid-
ered for the Z
F
(s) implementation. A zero at
ω
F
=1/R
F
C
F
is then introduced together with an integrator. This in-
tegrator minimizes the static error while placing the zero in correspondence with the L-C resonance a simple -
20dB/dec shape of the gain is assured (See Figure 14). In fact, considering the usual value for the output filter,
the LC resonance results to be at frequency lower than the above reported zero.Compensation network can be
simply designed placing
ω
Z
=
ω
LC
and imposing the cross-over frequency
ω
T
as desired obtaining:
Figure 14. ACM Control Loop Gain Block Diagram (left) and Bode Diagram (right)
PWM
4
5
--
V
V
OSC
------------------
=
G
LOOP
s
( )
4
5
--
------------------
s
( )
Z
L
s
+
( )
------------------------------------
Rg
-------
Z
s
R
FB
--------------
+
–
=
G
LOOP
s
( )
4
5
--
V
V
OSC
------------------
Z
s
R
FB
--------------
Ro
--------+
R
R
L
2
Ro
------
+
1
s Co
R
//Ro
2 Ro
ESR
+
(
)
+
s
2
Co
2
--
s
---------------
Co ESR
Co
L
2
------
+
+
1
+
+
----------------------------------------------------------------------------------------------------------------------------------
–
=
G
LOOP
s
( )
4
5
--
------------------
--------------
1
s Co
R
ESR
+
(
)
+
L
2
--
s
2 Ro
---------------
Co ESR
Co
R
L
2
------
+
+
1
+
+
----------------------------------------------------------------------------------------------------------------------------------
–
=
R
F
R
----------------------------------
V
V
IN
5
4
--
ω
T
2
R
DROOP
ESR
+
(
)
-------------------------------------------------------
=
C
F
Co
L
2
--
R
F
-------------------
=
Rout
Cout
ESR
L/2
R
FB
R
F
C
F
REF
PWM
I
FB
V
COMP
V
OUT
d
V
IN
Z
F
dB
ω
ω
T
ω
Z
ω
LC
G
LOOP
Z
F
(s)
K
K
4
5
--
V
osc
---------------
FB
----------
dB
=
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| L6919ETR | 功能描述:DC/DC 開關(guān)控制器 5-Bit Dual Ph Contlr 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 |
| L-692 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:Common Mode Inductor |
| L6920 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
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