www.德州仪器.com
特性
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
NC
输出
NC
地
NC
FB
NC
V
在
NC
地
地
地
地
NC
在
/止
n (pdip) pACKAGE
(t运算 视图)
ktt (to-263) pACKAGE
(t运算 视图)
1
2
3
4
5
地
开关
反馈
地
输出
V
在
产品
描述/orderinginformation
LM2575
1-asimplestep-downswitchingvoltageregulator
SLVS569D–JANUARY2005–REVISEDJULY2005
•
fixed3.3-v,5-v,12-v,and15-voptionswith
±
5%regulation(最大值)overline,加载,和
TemperatureConditions
•
adjustableoptionwitharangeof1.23vto
37Vand
±
4%regulation(最大值)overline,
加载,andtemperatureconditions
•
specified1-aoutputcurrent
•
WideInputVoltageRange
…
4.75vto40v
•
RequiresOnlyFourExternalComponents
(fixedversions)andusesreadilyavailable
StandardInductors
•
52-khz(典型值)fixed-frequencyinternal
振荡器
•
ttlshutdowncapabilitywith50-
µ
一个(典型值)
StandbyCurrent
•
HighEfficiency
…
ashighas88%(典型值)
•
thermalshutdownandcurrent-限制
protectionwithcycle-用-cyclecurrent
限制的
•
simplehigh-efficiencystep-向下(buck)
调整器
•
前-regulatorforlinearregulators
•
在-cardswitchingregulators
•
积极的-至-negativeconverter(buck-boost)
TheLM2575greatlysimplifiesthedesignofswitchingpowersuppliesbyconvenientlyprovidingalltheactive
functionsneededforastep-向下(buck)switchingregulatorinanintegratedcircuit.acceptingawideinput
voltagerangeandavailableinfixedoutputvoltagesof3.3v,5v,12v,15v,oranadjustableoutputversion,
thelm2575hasanintegratedswitchcapableofdelivering1aofloadcurrent,withexcellentlineandload
规章制度.thedevicealsooffersinternalfrequencycompensation,afixed-frequencyoscillator,循环-用-循环
currentlimiting,andthermalshutdown.inaddition,amanualshutdownisavailableviaanexternalon/offpin.
thelm2575representsasuperioralternativetopopularthree-terminallinearregulators.duetoitshigh
效率,itsignificantlyreducesthesizeoftheheatsinkand,inmanycases,noheatsinkisrequired.
optimizedforusewithstandardseriesofinductorsavailablefromseveraldifferentmanufacturers,thelm2575
greatlysimplifiesthedesignofswitch-modepowersuppliesbyrequiringaminimaladditionofonlyfourtosix
externalcomponentsforoperation.
TheLM2575ischaracterizedforoperationoverthevirtualjunctiontemperaturerangeof–40
°
Cto125
°
c.
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
productiondatainformationiscurrentasofpublicationdate.
copyright©2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
: 点此下载
