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| 型号： | LM2675M-5.0X |
| 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, SOIC-8 |
| 文件页数： | 9/26页 |
| 文件大小： | 920K |
| 代理商： | LM2675M-5.0X |
LM2675 Series Buck Regulator Design Procedure (Fixed Output) (Continued)
LM2675 Series Buck Regulator Design Procedure (Adjustable Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
To simplify the buck regulator design procedure, National
Semiconductor is making available computer design software to
be used with the SIMPLE SWITCHER line of switching
regulators. LM267X Made Simple version 6.0 is available for
use on Windows 3.1, NT, or 95 operating systems.
Given:
V
OUT = Regulated Output Voltage
V
OUT = 20V
V
IN(max) = Maximum Input Voltage
V
IN(max) = 28V
I
LOAD(max) = Maximum Load Current
I
LOAD(max) = 1A
F = Switching Frequency (Fixed at a nominal 260 kHz).
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in Figure 3)
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in Figure 3)
Use the following formula to select the appropriate resistor
values.
Select R
1 to be 1 k
, 1%. Solve for R
2.
where V
REF = 1.21V
Select a value for R
1 between 240
and 1.5 k. The lower
resistor values minimize noise pickup in the sensitive feedback
pin. (For the lowest temperature coefficient and the best stability
with time, use 1% metal film resistors.)
R
2 = 1k (16.53 1) = 15.53 k
, closest 1% value is 15.4 k.
R
2 = 15.4 k
.
AVX TPS
Recommended
Voltage
Application Voltage
Rating
+85C Rating
3.3
6.3
510
10
20
12
25
15
35
Sprague 594D
Recommended
Voltage
Application Voltage
Rating
+85C Rating
2.5
4
3.3
6.3
510
816
12
20
18
25
24
35
29
50
FIGURE 15.
LM2675
www.national.com
17
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| LM2675M-12X | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
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| LM2677LD-12 | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2675M-ADJ | 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 |
| LM2675M-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.1A ADJ SMD 2675 |
| LM2675M-ADJ/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 |
| LM2675M-ADJ/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| LM2675MX-12 | 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 |
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