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参数资料
| 型号： | L6711 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件页数： | 36/50页 |
| 文件大小： | 679K |
| 代理商： | L6711 |
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L6711
System control loop compensation
41/50
17
System control loop compensation
The control loop is composed by the Current Sharing control loop and the Average Current
Mode control loop. Each loop gives, with a proper gain, the correction to the PWM in order
to minimize the error in its regulation: the Current Sharing control loop equalize the currents
in the inductors while the Average Current Mode control loop fixes the output voltage equal
to the reference programmed by VID. Figure 21 shows the block diagram of the system
control loop.
Figure 21.
Main control loop diagram
The average current mode control loop is reported in Figure 22. The current information IFB
sourced by the FB pin flows into RFB implementing the dependence of the output voltage
from the read current.
The system can be modeled with an equivalent single phase converter which only
difference is the equivalent inductor L/3 (where each phase has an L inductor).The ACM
control loop gain results (obtained opening the loop after the COMP pin):
Where:
●
RSENSE is the mosfet RdsON or the Inductor DCR depending on the sensing element
selected;
●
is the equivalent output resistance determined by droop;
●
ZP(s) is the impedance resulting by the parallel of the output capacitor (and its ESR)
and the applied load Ro;
●
ZF(s) is the compensation network impedance;
●
ZL(s) is the parallel of the three inductor impedance;
●
A(s) is the error amplifier gain;
C
O
M
P
V
ID
FB
R
F
B
4/5
ZF(s)
E
R
O
RA
M
PLIFIER
P
W
M
3
P
W
M
1
000000000000000000
C
U
R
E
N
T
SH
AR
IN
G
D
U
T
YC
Y
C
LE
C
O
R
E
C
TIO
N
C
o
R
o
L3
L1
P
W
M
2
L2
1/5
IINFO1
IINFO2
IINFO3
IFB
G
L OOP s
()
PWM Z
F s
() R
D ROOP
Z
P s
()
+
()
Z
P s
() Z
L s
()
+
()
Z
F s
()
As
()
--------------
1
As
()
------------
+
R
FB
+
-------------------------------------------------------------------------------------------------------------------
–
=
R
D ROOP
R
SEN SE
Rg
--------------------- RFB
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6711_06 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3 Phase controller with dynamic VID and selectable DACs |
| L6711TR | 功能描述:DC/DC 开关控制器 3 PHASE CONTROLLER RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6712 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
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