www.德州仪器.com
featuresofthepth/ptvfamilyofnon-分开的,宽-outputadjustpowermodules
POLA™Compatibility
软-startpowerup
12 v
地
地
3.3 v
PTV12010W
追踪
地
调整
V
O
V
I
C1
R
设置
, 2 k
1%
0.05 w
C2
C3
++
vin (5 v/div)
vo (1 v/div)
iin (5一个/div)
horiz 规模 5 ms/div
PTV12010L
PTV12010W
SLTS234–DECEMBER2004
thepth/ptvfamilyofnon-分开的,宽-outputadjustablepowermodulesfromtexasinstrumentsare
optimizedforapplicationsthatrequireaflexible,高-performancemodulethatissmallinsize.eachofthese
productsarepola™compatible.pola-compatibleproductsareproducedbyanumberofmanufacturers,和
offercustomersadvanced,非-isolatedmoduleswiththesamefootprintandformfactor.polapartsarealso
ensuredtobeinteroperable,therebyprovidingcustomerswithtruesecond-sourceavailability.
theauto-trackfeatureallowsthepowerupofmultiplepth/ptvmodulestobedirectlycontrolledfromthe
trackpin.不管怎样,inastand-aloneconfiguration,orwhentheauto-trackfeatureisnotbeingused,这
追踪
pinshouldbedirectlyconnectedtotheinputvoltage,v
i
(seefigure12).
figure12.
Whenthe
追踪
pinisconnectedtotheinputvoltage,theauto-trackfunctionispermanentlydisengaged.这个
allowsthemoduletopowerupentirelyunderthecontrolofitsinternalsoft-startcircuitry.whenpowerupis
undersoft-startcontrol,theoutputvoltagerisestothesetpointataquickerandmorelinearrate.
figure13.
fromthemomentavalidinputvoltageisapplied,thesoft-startcontrolintroducesashorttimedelay(typically8
ms-15ms)beforeallowingtheoutputvoltagetorise.theoutputthenprogressivelyrisestothemoduleset-要点
电压.figure13showsthesoft-startpower-upcharacteristicofapth/ptvmodule,operatingfroma12-v
inputbusandconfiguredfora3.3-voutput.thewaveformsweremeasuredwitha5-aresistiveloadandthe
自动-trackfeaturedisabled.theinitialriseininputcurrentwhentheinputvoltagefirststartstoriseisthecharge
currentdrawnbytheinputcapacitors.powerupiscompletewithin25ms.
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