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参数资料
| 型号： | L5981 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 3 X 3 MM, 1.08 MM HEIGHT, LEAD FREE, VFQFPN-8 |
| 文件页数： | 13/37页 |
| 文件大小： | 714K |
| 代理商： | L5981 |
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Application information
L5981
20/37
Doc ID 13004 Rev 6
Equation 18
where K is the feed forward constant and 1 / K is equals to 9.
3.
Calculate C4 by placing the zero at 50 % of the output filter double pole frequency (fLC):
Equation 19
4.
Calculate C5 by placing the second pole at four times the system bandwidth (BW):
Equation 20
5.
Set also the first pole at four times the system bandwidth and also the second zero at
the output filter double pole:
Equation 21
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW / 3.5), anyway lower than 100 kHz if the FSW is set higher than 500 kHz.
For example with VOUT = 3.3 V, VIN = 12 V, IO = 1 A, L =33 μH, COUT = 22 μF, ESR < 1 mΩ,
the type III compensation network is:
In Figure 12 is shown the module and phase of the open loop gain. The bandwidth is about
56 kHz and the phase margin is 53 °.
R
4
BW K
f
LC
------------------ R
1
=
C
4
1
π R
4
f
LC
---------------------------
=
C
5
C
4
2
π R
4
C
4
4BW
1
–
--------------------------------------------------------------
=
R
3
R
1
4BW
f
LC
-----------------
1
–
---------------------------
=
C
3
1
2
π R
3
4BW
-----------------------------------------
=
,
R
1
4.99k
Ω
=
R
2
1.1k
Ω
=
R
3
110
Ω
=
R
4
5.6k
Ω
=
C
3
4.7nF
=
C
4
10nF
=
C
5
100pF
=
,,
,
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5981_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1 A step-down switching regulator |
| L5981TR | 功能描述:直流/直流开关调节器 1a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5983 | 功能描述:直流/直流开关调节器 1.5A STEP-DOWN SWITCHING REGULATOR RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5983_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.5 A step-down switching regulator |
| L5983TR | 功能描述:直流/直流开关调节器 1.5a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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