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thetps61040/41limitsthisinrushcurrentbyincreasingthecurrentlimitintwostepsstartingfrom
I
LIM
4
for256
cyclesto
I
LIM
2
forthenext256cycles,andthenfullcurrentlimit(refertofigure14).
使能
UNDERVOLTAGELOCKOUT
ABSOLUTEMAXIMUMRATINGS
DISSIPATIONRATINGTABLE
(1)
RECOMMENDEDOPERATINGCONDITIONS
TPS61040
TPS61041
SLVS413B–OCTOBER2002–REVISEDMAY2004
detaileddescription(持续)
pullingtheenable(en)togroundshutsdownthedevicereducingtheshutdowncurrentto1µa(典型).自从
thereisaconductivepathfromtheinputtotheoutputthroughtheinductorandschottkydiode,theoutput
voltageisequaltotheinputvoltageduringshutdown.theenablepinneedstobeterminatedandshouldnotbe
leftfloating.usingasmallexternaltransistordisconnectstheinputfromtheoutputduringshutdownasshownin
figure18.
anundervoltagelockoutpreventsmisoperationofthedeviceatinputvoltagesbelowtypical1.5v.whentheinput
voltageisbelowtheundervoltagethresholdthemainswitchisturnedoff.
overoperatingfree-airtemperature(unlessotherwisenoted)
(1)
单位
SupplyvoltagesonpinVIN
(2)
-0.3vto7v
voltagesonpinsen,fb
(2)
-0.3vtov
在
+0.3v
SwitchvoltageonpinSW
(2)
30V
ContinuouspowerdissipationSeeDissipationRatingTable
T
J
operatingjunctiontemperature-40
°
Cto150
°
C
T
Stg
storagetemperature-65
°
Cto150
°
C
leadtemperature(soldering10seconds)260
°
C
(1)stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.thesearestressratings
仅有的,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating
conditionsisnotimplied.exposuretoabsolute-最大-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)allvoltagevaluesarewithrespecttonetworkgroundterminal.
T
一个
≤
25
°
CDERATINGFACTORT
一个
=70
°
CT
一个
=85
°
C
包装
POWERRATINGABOVET
一个
=25
°
CPOWERRATINGPOWERRATING
dbv357mw3.5mw/
°
C192mW140mW
(1)thethermalresistancejunctiontoambientofthe5-pinsot23is250
°
c/w.
MINTYPMAXUNIT
vininputvoltagerange1.86v
V
输出
Outputvoltagerange28V
LInductor
(1)
2.210µh
fSwitchingfrequency
(1)
1MHz
C
在
Inputcapacitor
(1)
4.7µf
C
输出
Outputcapacitor
(1)
1µF
T
一个
operatingambienttemperature-4085
°
C
T
J
operatingjunctiontemperature-40125
°
C
(1)refertoapplicationsectionforfurtherinformation
4
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