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资料编号:1049707
 
资料名称:TPS73025DBVRG4
 
文件大小: 385K
   
说明
 
介绍:
LOW-NOISE, HIGH PSRR, RF 200-mA LOW-DROPOUT LINEAR REGULATORS
 
 


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本平台电子爱好着纯手工中文简译:截至2020/5/17日,支持英文词汇500个
www.德州仪器.com
PowerDissipationandJunctionTemperature
P
D
(
最大值
)
T
J
最大值
T
一个
R
JA
(1)
P
D
V
V
输出
I
输出
(2)
ProgrammingtheTPS73001AdjustableLDORegulator
V
输出
V
REF
1
R
1
R
2
(3)
R
1
V
输出
V
ref
1
R
2
(4)
C
1
(3 x 10
7
) x (r
1
R
2
)
(r
1
x R
2
)
(5)
tps73001,tps73018
TPS73025
tps73030,tps73033
SBVS054A–NOVEMBER2004–REVISEDNOVEMBER2004
applicationinformation(持续)
Specifiedregulatoroperationisassuredtoajunctiontemperatureof125
°
c;themaximumjunctiontemperature
shouldberestrictedto125
°
cundernormaloperatingconditions.thisrestrictionlimitsthepowerdissipationthe
regulatorcanhandleinanygivenapplication.toensurethejunctiontemperatureiswithinacceptablelimits,
calculatethemaximumallowabledissipation,p
d(最大值)
,andtheactualdissipation,p
D
,whichmustbelessthanor
equaltoP
d(最大值)
.
themaximumpowerdissipationlimitisdeterminedusingequation1:
在哪里:
T
J
maxisthemaximumallowablejunctiontemperature.
R
θ
JA
isthethermalresistancejunction-至-ambientforthepackage(seethedissipationratingstable).
T
一个
istheambienttemperature.
theregulatordissipationiscalculatedusingequation2:
powerdissipationresultingfromquiescentcurrentisnegligible.excessivepowerdissipationtriggersthethermal
protectioncircuit.
TheoutputvoltageoftheTPS73001adjustableregulatorisprogrammedusinganexternalresistordivideras
showninfigure17.theoutputvoltageiscalculatedusingequation3:
在哪里:
V
REF
=1.225vtyp(theinternalreferencevoltage)
resistorsr1andr2shouldbechosenforapproximately50-µadividercurrent.lowervalueresistorscanbe
usedforimprovednoiseperformance,butthesolutionconsumesmorepower.higherresistorvaluesshouldbe
avoidedasleakagecurrentinto/outoffbacrossr1/r2createsanoffsetvoltagethatartificiallyin-
creases/decreasesthefeedbackvoltageandthuserroneouslydecreases/increasesv
输出
.therecommended
designprocedureistochooser2=30.1k
tosetthedividercurrentat50µa,c1=15pfforstability,andthen
calculater1usingequation4:
inordertoimprovethestabilityoftheadjustableversion,itissuggestedthatasmallcompensationcapacitorbe
placedbetweenoutandfb.forvoltages<1.8v,thevalueofthiscapacitorshouldbe100pf.forvoltages>
1.8v,theapproximatevalueofthiscapacitorcanbecalculatedasshowninequation5:
thesuggestedvalueofthiscapacitorforseveralresistorratiosisshowninthetablebelow.ifthiscapacitoris
notused(suchasinaunity-gainconfiguration)orifanoutputvoltage<1.8vischosen,thentheminimum
recommendedoutputcapacitoris4.7µfinsteadof2.2µf.
8
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