- 您現在的位置：買賣IC網 > PDF目錄361024 > LM2596 (National Semiconductor, Corp.) SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator PDF資料下載
參數資料
| 型號： | LM2596 |
| 廠商： | National Semiconductor, Corp. |
| 元件分類： | 穩壓器 |
| 英文描述： | SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator |
| 中文描述： | SIMPLE SWITCHER系列電源轉換器,150KHz，3A降壓穩壓器 |
| 文件頁數： | 10/31頁 |
| 文件大小： | 736K |
| 代理商： | LM2596 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
LM2596 Series Buck Regulator Design Procedure (Fixed Output)
PROCEDURE (Fixed Output Voltage Version)
EXAMPLE (Fixed Output Voltage Version)
Given:
V
OUT
= Regulated Output Voltage (3.3V, 5V or 12V)
V
IN
(max) = Maximum DC Input Voltage
I
LOAD
(max) = Maximum Load Current
Given:
V
OUT
= 5V
V
IN
(max) = 12V
I
LOAD
(max) = 3A
1. Inductor Selection (L1)
A.
Select the correct inductor value selection guide from Fig-
ures 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.
B.
From the inductor value selection guide, identify the induc-
tance 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).
C.
Select an appropriate inductor from the four manufacturer’s
part numbers listed in Figure 8
1. Inductor Selection (L1)
A.
Use the inductor selection guide for the 5V version shown
in Figure 5
B.
From the inductor value selection guide shown in Figure 5
the inductance region intersected by the 12V horizontal line
and the 3A vertical line is 33 μH, and the inductor code is L40.
C.
The inductance value required is 33 μH. From the table in
Figure 8 go to the L40 line and choose an inductor part
number from any of the four manufacturers shown. (In most
instance, both through hole and surface mount inductors are
available.)
2. Output Capacitor Selection (C
OUT
)
A.
In the majority of applications, low ESR (Equivalent Series
Resistance) electrolytic capacitors between 82 μF and 820 μF
and low ESR solid tantalum capacitors between 10 μF and
470 μF provide the best results. This capacitor should be
located close to the IC using short capacitor leads and short
copper traces. Do not use capacitors larger than 820 μF .
For additional information, see section on output capaci-
tors in application information section.
B.
To simplify the capacitor selection procedure, refer to the
quick design component selection table shown in Figure 2
This table contains different input voltages, output voltages,
and load currents, and lists various inductors and output ca-
pacitors that will provide the best design solutions.
C.
The capacitor voltage rating for electrolytic capacitors
should be at least 1.5 times greater than the output voltage,
and often much higher voltage ratings are needed to satisfy
the low ESR requirements for low output ripple voltage.
D.
For computer aided design software, see Switchers Made
Simple
version 4.3 or later.
2. Output Capacitor Selection (C
OUT
)
A. See section on output capacitors in application infor-
mation section.
B.
From the quick design component selection table shown in
Figure 2 locate the 5V output voltage section. In the load
current column, choose the load current line that is closest to
the current needed in your application, for this example, use
the 3A line. In the maximum input voltage column, select the
line that covers the input voltage needed in your application, in
this example, use the 15V line. Continuing on this line are
recommended inductors and capacitors that will provide the
best overall performance.
The capacitor list contains both through hole electrolytic and
surface mount tantalum capacitors from four different capaci-
tor manufacturers. It is recommended that both the manufac-
turers and the manufacturer’s series that are listed in the table
be used.
In this example aluminum electrolytic capacitors from several
different manufacturers are available with the range of ESR
numbers needed.
330 μF
35V
Panasonic HFQ Series
330 μF
35V
Nichicon PL Series
C.
For a 5V output, a capacitor voltage rating at least 7.5V or
more is needed. But even a low ESR, switching grade, 220 μF
10V aluminum electrolytic capacitor would exhibit approxi-
mately 225 m
of ESR (see the curve in Figure 14for the ESR
vs voltage rating). This amount of ESR would result in rela-
tively high output ripple voltage. To reduce the ripple to 1% of
the output voltage, or less, a capacitor with a higher value or
with a higher voltage rating (lower ESR) should be selected. A
16V or 25V capacitor will reduce the ripple voltage by approxi-
mately half.
L
www.national.com
10
相關PDF資料 |
PDF描述 |
|---|---|
| LM2596S-5.0 | SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator |
| LM2596S-12 | CA-BAYONET |
| LM2596S-3.3 | SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator |
| LM2596S-ADJ | SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator |
| LM2598T-12 | SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2596ADPBCKGEVB | 功能描述:BOARD EVAL LM2596ADJ BUCK D2PAK RoHS:是 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2596ATPBCKGEVB | 功能描述:BOARD EVAL LM2596ADJ BUCK TO-220 RoHS:是 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2596DSADJG | 功能描述:直流/直流開關調節器 3A BUCK SWCH 150KHZ RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2596DSADJR4G | 功能描述:直流/直流開關調節器 3A BUCK SWCH 150KHZ RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2596S | 制造商:Texas Instruments 功能描述: |
發布緊急采購，3分鐘左右您將得到回復。