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| 型号： | LM2675M-ADJEP |
| 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 |
| 文件页数： | 2/25页 |
| 文件大小： | 516K |
| 代理商： | LM2675M-ADJEP |
LM2675EP Series Buck Regulator Design Procedure (Fixed Output)
PROCEDURE (Fixed Output Voltage Version)
EXAMPLE (Fixed 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 on
Windows 3.1, NT, or 95 operating systems.
Given:
V
OUT = Regulated Output Voltage (3.3V, 5V, or 12V)
V
OUT =5V
V
IN(max) = Maximum DC Input Voltage
V
IN(max) = 12V
I
LOAD(max) = Maximum Load Current
I
LOAD(max) = 1A
1. Inductor Selection (L1)
A. Select the correct inductor value selection guide from Figure
4, Figure 5 or Figure 6 (output voltages of 3.3V, 5V, or 12V
respectively). For all other voltages, see the design procedure
for the adjustable version.
A. Use the inductor selection guide for the 5V version shown in
B. From the inductor value selection guide, identify the
inductance region intersected by the Maximum Input Voltage
line and the Maximum Load Current line. Each region is
identified by an inductance value and an inductor code (LXX).
B. From the inductor value selection guide shown in Figure 5,
the inductance region intersected by the 12V horizontal line and
the 1A vertical line is 33 H, and the inductor code is L23.
C. Select an appropriate inductor from the four manufacturer’s
part numbers listed in Figure 8. Each manufacturer makes a
different style of inductor to allow flexibility in meeting various
design requirements. Listed below are some of the
differentiating characteristics of each manufacturer’s inductors:
C. The inductance value required is 33 H. From the table in
Figure 8, go to the L23 line and choose an inductor part number
from any of the four manufacturers shown. (In most instances,
both through hole and surface mount inductors are available.)
Schott: ferrite EP core inductors; these have very low leakage
magnetic fields to reduce electro-magnetic interference (EMI)
and are the lowest power loss inductors
Renco: ferrite stick core inductors; benefits are typically lowest
cost inductors and can withstand E
T and transient peak
currents above rated value. Be aware that these inductors have
an external magnetic field which may generate more EMI than
other types of inductors.
Pulse: powered iron toroid core inductors; these can also be low
cost and can withstand larger than normal E
T and transient
peak currents. Toroid inductors have low EMI.
Coilcraft: ferrite drum core inductors; these are the smallest
physical size inductors, available only as SMT components. Be
aware that these inductors also generate EMI — but less than
stick inductors.
Complete specifications for these inductors are available from
the respective manufacturers. A table listing the manufacturers’
phone numbers is located in Figure 9.
2. Output Capacitor Selection (C
OUT)
2. Output Capacitor Selection (C
OUT)
A. Select an output capacitor from the output capacitor table in
Figure 10. Using the output voltage and the inductance value
found in the inductor selection guide, step 1, locate the
appropriate capacitor value and voltage rating.
A. Use the 5.0V section in the output capacitor table in Figure
10. Choose a capacitor value and voltage rating from the line
that contains the inductance value of 33 H. The capacitance
and voltage rating values corresponding to the 33 H inductor
are the:
LM2675EP
Enhanced
Plastic
www.national.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| LM2675LD-12EP | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, DSO8 |
| LM2675MX-5.0EP | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2675LD-3.3EP | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, DSO8 |
| LM2675N-ADJEP | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDIP8 |
| LM2675M-5.0X | 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
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| 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 |
| LM2675MX-12/NOPB | 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 |
| LM2675MX-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 |
| LM2675MX-3.3/NOPB | 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 |
| LM2675MX-33 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LM2675 SIMPLE SWITCHER?? Power Converter High Efficiency 1A Step-Down Voltage Regulator |
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