www.德州仪器.com
DEVICEINFORMATION
管脚
1
管脚
5
管脚
12
ptv12020w/l
SLTS231A–NOVEMBER2004–REVISEDFEBRUARY2005
TERMINALFUNCTIONS
终端
描述
nameno.
V
I
5,6thepositiveinputvoltagepowernodetothemodule,whichisreferencedtocommongnd.
V
O
3,4theregulatedpositivepoweroutputwithrespecttothegndnode.
ThisisthecommongroundconnectionfortheV
I
andV
O
powerconnections.itisalsothe0vdcreferenceforthe
gnd1,2,10,11
controlinputs.
theinhibitpinisanopen-集电级/流,起作用的-lowinputthatisreferencedtognd.applyingalow-levelground
signaltothisinputdisablesthemodule’soutputandturnsofftheoutputvoltage.whentheinhibitcontrolisactive,
Inhibit12
theinputcurrentdrawnbytheregulatorissignificantlyreduced.iftheinhibitfeatureisnotused,thecontrolpin
shouldbeleftopen-电路.themodulethenproducesanoutputvoltagewheneveravalidinputsourceisapplied.
a1%resistormustbeconnecteddirectlybetweenthispinandgnd(pin1or2)tosettheoutputvoltageofthe
modulehigherthanitslowestvalue.thetemperaturestabilityoftheresistorshouldbe100ppm/
°
c(orbetter).
theset-pointrangeis1.2vto5.5vforw-suffixdevicesand0.8vto1.8vforl-suffixdevices.theresistorvalue
requiredforagivenoutputvoltagemaybecalculatedusingaformula.ifleftopen-电路,themoduleoutput
V
o
Adjust8
voltagedefaultstoitslowestvalue.forfurtherinformationonoutputvoltageadjustment,consulttherelated
applicationnote.
thespecificationtablegivesthestandardresistorvaluesforanumberofcommonoutputvoltages.
thesenseinputallowstheregulationcircuittocompensateforvoltagedropbetweenthemoduleandtheload.为
V
o
Sense7
optimalvoltageaccuracyV
o
SenseshouldbeconnectedtoV
O
.itcanalsobeleftdisconnected.
thisisananalogcontrolinputthatenablestheoutputvoltagetofollowanexternalvoltage.thispinbecomes
activetypically20msaftertheinputvoltagehasbeenapplied,andallowsdirectcontroloftheoutputvoltagefrom
0vuptothenominalset-pointvoltage.withinthisrange,theoutputfollowsthevoltageatthetrackpinona
volt-为-voltbasis.whenthecontrolvoltageisraisedabovethisrange,themoduleregulatesatitsset-要点
Track9
电压.thefeatureallowstheoutputvoltagetorisesimultaneouslywithothermodulespoweredfromthesame
inputbus.ifunused,thisinputshouldbeconnectedtov
I
.
便条:duetotheundervoltagelockoutfeature,theoutputofthemodulecannotfollowitsowninputvoltage
duringpowerup.consulttherelatedapplicationinformationforfurtherguidance.
FrontViewofModule
figure10.管脚/terminallocations
7
: 点此下载
