www.德州仪器.com
ELECTRICALCHARACTERISTICS
PTN78060W
SLTS229–NOVEMBER2004
operatingat25
°
cfree-airtemperature,v
I
=20v,v
O
=5v,i
O
=I
O
(最大值),c
I
=2.2µf,c
O
=100µf(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
I
O
OutputcurrentT
一个
=85
°
c,naturalconvectionairflow03a
V
I
InputvoltagerangeOverI
O
range7
(1)
36
(2)
V
设置-pointvoltagetolerancet
一个
=25
°
C
±
2%
(3)
Temperaturevariation–40
°
Cto+85
°
C
±
0.5%
LineregulationOverV
I
范围
±
10mV
V
O
LoadregulationOverI
O
范围
±
10mV
includessetpoint,线条,加载
Totaloutputvoltagevariation
±
3%
(3)
–40<t
一个
<85
°
C
V
I
<12v2.5v
I
–2
12V
≤
V
I
≤
15.1v2.5v
I
–2.5
V
O
(adj)outputvoltageadjustrangev
15.1v<v
I
≤
25v2.512.6
V
I
>25v0.1
×
V
I
12.6
V
I
=24v,i
O
=3A
R
设置
=732
Ω
,v
O
=12V94%
η
效率
R
设置
=21k
Ω
,v
O
=5V86%
R
设置
=78.7k
Ω
,v
O
=3.3v82%
outputvoltageripple20-mhzbandwidth1%v
O
V
(pp)
I
o(lim)
Currentlimitthreshold
∆
V
O
=–50mv5.5a
1-一个/µsloadstepfrom50%to100%i
O
最大值
TransientresponseRecoverytime100µs
V
O
在/undershoot5%v
O
inputhighvoltage(v
IH
)1open
(4)
V
inhibitcontrol(pin3)inputlowvoltage(v
IL
)–0.10.3
inputlowcurrent(i
IL
)–0.25ma
I
i(stby)
InputstandbycurrentPin3connectedtoGND17mA
F
S
SwitchingfrequencyOverV
I
andI
O
ranges440550660kHz
C
I
externalinputcapacitance2.2
(5)
µF
ceramicornonceramic100
(6)
ceramic200µF
C
O
Externaloutputcapacitance
nonceramic2,000
equivalentseriesresistance(nonceramic)17
(7)
m
Ω
pertelcordiasr-332,50%stress,
mtbfcalculatedreliability8.910
6
Hr
T
一个
=40
°
c,groundbenign
(1)foroutputvoltageslessthan10v,theminimuminputvoltageis7vor(v
O
+2)v,whicheverisgreater.foroutputvoltagesof10v
andhigher,theminimuminputvoltageis(v
O
+2.5)v.seetheapplicationinformationforfurtherguidance.
(2)foroutputvoltageslessthan3.6v,themaximuminputvoltageis10
×
V
O
.seetheapplicationinformationforfurtherguidance.
(3)theset-pointvoltagetoleranceisaffectedbythetoleranceandstabilityofr
设置
.thestatedlimitisunconditionallymetifr
设置
hasa
toleranceof1%with100ppm/
°
corbettertemperaturestability.
(4)thiscontrolpinhasaninternalpullup,andifleftopen-circuitthemoduleoperateswheninputpowerisapplied.theopen-circuitvoltage
istypically1.5v.asmalllow-泄漏(<100na)mosfetisrecommendedforcontrol.seetheapplicationinformationforfurther
guidance.
(5)anexternal2.2-µfceramiccapacitorisrequiredacrosstheinput(v
I
andgnd)forproperoperation.locatethecapacitorclosetothe
单元.
(6)100µfofoutputcapacitanceisrequiredforproperoperation.seetheapplicationinformationforfurtherguidance.
(7)thisisthetypicalesrforalltheelectrolytic(nonceramic)电容.use17m
Ω
astheminimumwhenusingmax-esrvaluesto
计算.
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