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| 型号： | LM2675-12MWC |
| 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, UUC |
| 封装： | WAFER |
| 文件页数： | 8/29页 |
| 文件大小： | 567K |
| 代理商： | LM2675-12MWC |
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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).
F = Switching Frequency
(Fixed at a nominal 260 kHz).
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Use the following formula to select the appropriate resistor
values.
Select R
1 to be 1 k, 1%. Solve for R2.
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.
2. Inductor Selection (L1)
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
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2675-5.0EVAL | 功能描述:电源管理IC开发工具 LM2675-5.0 EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM2675-5.0EVAL/NOPB | 制造商:National Semiconductor Corporation 功能描述:Semi,Regulator,Eval |
| LM2675EP | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator |
| LM2675LD-12 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator |
| LM2675LD-12/NOPB | 功能描述:IC REG BUCK 12V 1A 16LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SIMPLE SWITCHER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
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