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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： | 37/50页 |
| 文件大小： | 679K |
| 代理商： | L6711 |
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System control loop compensation
L6711
42/50
●
is the PWM transfer function where
VOSC is the oscillator ramp
amplitude and has a typical value of 3V
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>>RL;
ESR<<Ro and RDROOP<<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
ωT. Neglecting the effect of ZF(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 RF-CF series network is considered for the ZF(s)
implementation. A zero at
ωF =1/RFCF is then introduced together with an integrator. This
integrator 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).
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
ωZ=ωLC and imposing the cross-
over frequency
ωT as desired obtaining:
PWM
4
5
---
V
IN
V
osc
---------------
=
G
L OOP s
()
4
5
---
V
IN
V
OSC
------------------
Z
F s
()
Z
P s
() Z
L s
()
+
------------------------------------
Rs
Rg
--------
Z
P s
()
R
FB
---------------
+
–
=
G
L OOP s
()
4
5
---
V
IN
V
OSC
------------------
Z
F s
()
R
FB
--------------
Ro
R
DROOP
+
Ro
R
L
3
-------
+
-------------------------------------
1s Co
R
DROOP//Ro
ESR
+
()
+
s
2
Co
L
3
---
s
L
3Ro
---------------
Co ESR
Co
+
R
L
3
-------
+
1
+
+
---------------------------------------------------------------------------------------------------------------------------------
–
=
G
L OOP s
()
4
5
---
V
IN
V
OSC
------------------
Z
F s
()
R
FB
--------------
1s Co
R
D ROOP
ESR
+
()
+
s
2
Co
L
3
---
s
L
3Ro
---------------
Co ESR
Co
+
R
L
3
-------
+
1
+
+
---------------------------------------------------------------------------------------------------------------------------------
–
=
R
F
R
FB
V
OSC
V
IN
----------------------------------
5
4
---
ω
T
L
3R
DROOP
ESR
+
()
-------------------------------------------------------
=
C
F
Co
L
3
---
R
F
--------------------
=
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| L6725TR | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
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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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