參數(shù)資料
型號(hào)： LM2672M-5.0X
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁數(shù)： 2/26頁
文件大小： 626K
代理商： LM2672M-5.0X
LM2672 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
and 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.
1. Inductor Selection (L1)
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
μH, 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
μH. 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 ET 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 ET 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)
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.
2. Output Capacitor Selection (C
OUT)
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
μH. The capacitance and
voltage rating values corresponding to the 33
μH
www.national.com
10
LM2672
相關(guān)PDF資料
PDF描述
LM2672LD-5.0/NOPB 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO16
LM2672M-ADJX 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, PDSO8
LM2674-3.3MDC 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
LM2674-3.3MWC 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
LM2674-ADJMWC 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2672M-ADJ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2672M-ADJ 制造商:Texas Instruments 功能描述:SWITCHING REG 1A ADJ 2672 SOIC8
LM2672M-ADJ/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 HIGH EFF 1A STEP- DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2672M-ADJ/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu
LM2672MX-12 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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