Datasheet

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PTMA40XXXX
PTMA403033
PTMA402050
PTMA401120
SLTS259B–FEBRUARY2006–REVISEDMAY2007
TERMINALFUNCTIONS
TERMINAL
DESCRIPTION
NAMENO.
TheEnableinputisanopen-baselogicinputthatisreferencedtoV
I
–.TwoON/OFFenableoptionsareavailable,
positvelogicandnegativelogic.Positivelogicdevicesareenabledbyapplyingalogichighvoltage(Open)and
aredisabledbyapplyingalogiclowvoltage(V
I
–).Negativelogicdevicesareenabledbyapplyingalogiclow
voltage(V
I
–)andaredisabledbyapplyingalogichighvoltage(Open).SeetheApplicationInformationsectionfor
Enable/Sync
(1)
3
moredetailedinformation.
Thispinalsohastheoptionofasynchronizationinput.Amodulethathasthesynchronizationoptiondoesnot
haveON/OFFenablecontrol.A5-Vlogicsignalgreaterthanthefree-runningfrequencybut≤ 350 kHzisrequired
forsynchronizationcontrol.SeetheApplicationInformationsectionformoredetailedinformation.
Thenegativeinputsupplyforthemodule,andthe0-VreferencefortheEnable/Syncinputs.Whenpoweringthe
V
I
–
(1)
2
modulefromapositivesource,thisinputisconnectedtotheinputsourcereturn.
ThepositiveinputforthemodulewithrespecttoV
I
–.Whenpoweringthemodulefromanegativeinputvoltage,
V
I
+
(1)
1
thisinputisconnectedtotheinputsourceground.
V
O
+4ThisisthepositivepoweroutputwithrespecttoV
O
–.Itisdcisolatedfromtheinputpowerpins.
Thispinallowstheoutputvoltagesetpointofthemoduletobeincreasedordecreasedupto± 10 %.Connecting
aresistorbetweenthisterminalandV
O
+decreasestheoutputvoltagesetpoint.Connectingaresistorbetween
thisterminalandV
O
–increasestheoutputvoltagesetpoint.A0.05-Wratedresistormaybeused,withtolerance
Trim5
andtemperaturestabilityof1%and100ppm/°C,respectively.Ifleftopencircuit,theconverteroutputvoltage
defaultstoitsnominalvalue.Thespecificationtablegivesthestandardresistorvaluesforthemostcommon
outputvoltages.
ThisistheoutputpowerreturnfortheV
O
+bus.Thisterminalshouldbeconnectedtothecommonoftheload
V
O
–6
circuit.
(1)Thesefunctionsindicatesignalselectricallycommonwiththeinput.
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