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参数资料
| 型号： | L6910GTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 2/26页 |
| 文件大小： | 1046K |
| 代理商： | L6910GTR |
L6910G
10/26
Figure 10. Compensation Network
The compensation network consists in the internal error amplifier and the impedance networks ZIN (R3, R4 and
C20) and ZFB (R5, C18 and C19). The compensation network has to provide a closed loop transfer function with
the highest 0dB crossing frequency to have fast response (but always lower than fsw/10) and the highest gain
in DC conditions to minimize the load regulation.
A stable control loop has a gain crossing with -20dB/decade slope and a phase margin greater than 45°. Include
worst-case component variations when determining phase margin.
To locate poles and zeroes of the compensation networks, the following suggestions may be used:
Modulator singularity frequencies:
Compensation network singularity frequency:
– Put the gain R5/R3 in order to obtain the desired converter bandwidth;
– Place
ωZ1 before the output filter resonance ωLC;
– Place
ωZ2 at the output filter resonance ωLC;
– Place
ωP1 at the output capacitor ESR zero ωESR;
– Place
ωP2 at one half of the switching frequency;
– Check the loop gain considering the error amplifier open loop gain.
+
-
L
PWM
COMPARATOR
ESR
COUT
VOUT
VCOMP
EAREF
V
OSC
VIN
R3
C19
R5
C18
C20
R4
D03IN1512
ω
LC
1
LC
OUT
---------------------------
ω
ESR
1
ESR C
OUT
---------------------------------
==
ω
P1
1
R5
C18 C19
C18
C19
+
-----------------------------
-----------------------------------------------
ω
P2
1
R4 C20
------------------------
==
ω
Z1
1
R5 C19
------------------------
ω
Z2
1
R3
R4
+
() C20
-------------------------------------------
==
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6910R | 功能描述:DC/DC 开关控制器 5.0 to 12V Step-Down 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 |
| L6910RTR | 功能描述:DC/DC 开关控制器 5.0 to 12V Step-Down 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 |
| L6910S | 功能描述:DC/DC 开关控制器 5.0 to 12V Step-Down 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 |
| L6910STR | 功能描述:DC/DC 开关控制器 5.0 to 12V Step-Down 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 |
| L6910TR | 功能描述:DC/DC 开关控制器 5.0 to 12V Step-Down 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 |
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