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参数资料
| 型号： | L6727 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, SOP-8 |
| 文件页数： | 8/34页 |
| 文件大小： | 974K |
| 代理商： | L6727 |
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Application details
L6727
16/34
Doc ID 12933 Rev 4
Compensation goal is to close the control loop assuring high DC regulation accuracy, good
dynamic performances and stability. To achieve this, the overall loop needs high DC gain,
high bandwidth and good phase margin.
High DC gain is achieved giving an integrator shape to compensation network transfer
function. Loop bandwidth (F0dB) can be fixed choosing the right RF/RFB ratio, however, for
stability, it should not exceed FSW/2π. To achieve a good phase margin, the control loop gain
has to cross 0dB axis with -20 dB/decade slope.
As an example, Figure 7 shows an asymptotic bode plot of a type III compensation.
Figure 7.
Example of type III compensation.
●
Open loop converter singularities:
a)
b)
●
Compensation Network singularities frequencies:
a)
b)
c)
d)
Gain
[dB]
Log (Freq)
0dB
open loop
EA gain
closed
loop gain
compensation
gain
open loop
converter gain
F
LC
F
ESR
F
Z1 FZ2
F
P1
F
P2
20log (R
F/RFB)
20log (V
IN/ΔVOSC)
F
0dB
F
LC
1
2
π LC
OUT
----------------------------------
=
F
ESR
1
2
π C
OUT
ESR
--------------------------------------------
=
F
Z1
1
2
π R
F
C
F
------------------------------
=
F
Z2
1
2
π R
FB
R
S
+
() C
S
-----------------------------------------------------
=
F
P1
1
2
π R
F
C
F
C
P
C
F
C
P
+
---------------------
--------------------------------------------------
=
F
P2
1
2
π R
S
C
S
-------------------------------
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6727_10 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller |
| L6727TR | 功能描述:开关变换器、稳压器与控制器 Single PWM controler RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6728 | 功能描述:DC/DC 开关控制器 Sngl phase PWM 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 |
| L6728_0706 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller with Power Good |
| L6728A | 功能描述:电压模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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