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参数资料
| 型号： | LM2672M-12X |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 14/26页 |
| 文件大小： | 626K |
| 代理商： | LM2672M-12X |
Application Information
TYPICAL SURFACE MOUNT PC BOARD LAYOUT, FIXD OUTPUT (4X SIZE)
1293439
C
IN - 15 μF, 50V, Solid Tantalum Sprague, “594D series”
C
OUT - 68 μF, 16V, Solid Tantalum Sprague, “594D series”
D1 - 1A, 40V Schottky Rectifier, Surface Mount
L1 - 33
μH, L23, Coilcraft DO3316
C
B - 0.01 μF, 50V, Ceramic
TYPICAL SURFACE MOUNT PC BOARD LAYOUT, ADJUSTABLE OUTPUT (4X SIZE)
1293440
C
IN - 15 μF, 50V, Solid Tantalum Sprague, “594D series”
C
OUT - 33 μF, 25V, Solid Tantalum Sprague, “594D series”
D1 - 1A, 40V Schottky Rectifier, Surface Mount
L1 - 68
μH, L30, Coilcraft DO3316
C
B - 0.01 μF, 50V, Ceramic
R1 - 1k, 1%
R2 - Use formula in Design Procedure
FIGURE 18. PC Board Layout
Layout is very important in switching regulator designs.
Rapidly switching currents associated with wiring inductance
can generate voltage transients which can cause problems.
For minimal inductance and ground loops, the wires indicated
printed circuit traces and should be kept as short as pos-
sible.
For best results, external components should be locat-
ed as close to the switcher IC as possible using ground plane
construction or single point grounding.
If open core inductors are used, special care must be taken
as to the location and positioning of this type of inductor. Al-
lowing the inductor flux to intersect sensitive feedback, IC
ground path, and C
OUT wiring can cause problems.
When using the adjustable version, special care must be tak-
en as to the location of the feedback resistors and the asso-
ciated wiring. Physically locate both resistors near the IC, and
route the wiring away from the inductor, especially an open
core type of inductor.
21
www.national.com
LM2672
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2672M-3.3 | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2672M-3.3/NOPB | 功能描述:直流/直流开关转换器 HIGH EFF 1A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2672M-5.0 | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2672M-5.0 | 制造商:Texas Instruments 功能描述:SWITCHING REG 1A 5.0V 2672 SOIC8 |
| LM2672M-5.0/NOPB | 功能描述:直流/直流开关转换器 HIGH EFF 1A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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