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特点
应用程序
描述
TYPICALAPPLICATION
VIN
en
地
软件
fb
出点
ILED
PGND
VIN
2.7 v 至 6 v
C1
1
f
L1
22
h
右
s
12
C2
220 nf
TPS61060
TPS61061
TPS61062
SLVS538–NOVEMBER2004
CONSTANTCURRENTLEDDRIVERWITHDIGITALANDPWMBRIGHTNESSCONTROL
•
Upto80%Efficiency
•
LEDDriverWithIntegratedOvervoltageand
•
8-pinnanofree™package(chipscale,csp)
短-电路保护
•
3
×
3-mmqfnpackage
•
2.7-vto6.0-vinputvoltagerange
•
500-mv/250-mvfeedbackvoltage
•
WhiteLEDDriver
•
TPS61060PowersUpto3LEDs
•
CellularPhones
•
TPS61061PowersUpto4LEDs
•
pda,pocketpc,和智能手机
•
TPS61062PowersUpto5LEDs
•
DigitalStillCamera
•
PWMBrightnessControlonEnable
•
HandheldDevices
•
DigitalBrightnessControlonILED
•
1.0-mhzfixedswitchingfrequency
•
400-mainternalpowermosfetswitch
•
LEDsDisconnectedDuringShutdown
•
operateswithsmall-输出电容器
Downto220nF
thetps61060/61/62isahigh-频率,synchronousboostconverterwithconstantcurrentoutputtodriveup
to5whiteleds.formaximumsafety,thedevicefeaturesintegratedovervoltageandanadvancedshort-电路
protectionwhentheoutputisshortedtoground.thedeviceoperateswith1-mhzfixedswitchingfrequencyto
allowsmallexternalcomponentsandtosimplifypossibleemiproblems.thedevicecomeswiththreedifferent
overvoltageprotectionthresholds(14v/18v/23v)toallowinexpensiveandsmall-outputcapacitorswithlower
voltageratings.theledcurrentisinitiallysetwiththeexternalsenseresistorrs,andthefeedbackvoltageis
regulatedto500mvor250mv,dependingontheiledpinconfiguration.digitalbrightnesscontrolis
implementedbyapplyingasimpledigitalsignaltotheiledpin.或者,apwmsignalupto1khzcanbe
appliedtotheenablepintocontroltheledbrightness.duringshutdown,theoutputisdisconnectedfromthe
inputtoavoidleakagecurrentthroughtheleds.
figure1.
pleasebeawarethatanimportantnoticeconcerningavailability,标准保修,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
nanofree,powerpadaretrademarksoftexasinstruments.
productiondatainformationiscurrentasofpublicationdate.
copyright©2004,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
必要包括测试所有参数.
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