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DesigningforFastLoadTransients
ptv12020w/l
SLTS231A–NOVEMBER2004–REVISEDFEBRUARY2005
applicationinformation(持续)
便条:
thisisnotanextensivecapacitorlist.capacitorsfromothervendorsareavailablewithcomparable
规格.thoselistedareforguidance.thermsripplecurrentratingandesr(at100khz)arecritical
parametersnecessarytoensurebothoptimumregulatorperformanceandlongcapacitorlife.
thetransientresponseofthedc/dcconverterhasbeencharacterizedusingaloadtransientwithadi/dtof1
一个/µs.thetypicalvoltagedeviationforthisloadtransientisgiveninthedatasheetspecificationtableusingthe
optionalvalueofoutputcapacitance.asthedi/dtofatransientisincreased,theresponseofaconverter
regulationcircuitultimatelydependsonitsoutputcapacitordecouplingnetwork.thisisaninherentlimitationwith
anydc/dcconverteroncethespeedofthetransientexceedsitsbandwidthcapability.ifthetargetapplication
specifiesahigherdi/dtorlowervoltagedeviation,therequirementcanonlybemetwithadditionaloutput
capacitordecoupling.inthesecasesspecialattentionmustbepaidtothetype,valueandesrofthecapacitors
选择.
ifthetransientperformancerequirementsexceedthatspecifiedinthedatasheet,orthetotalamountofload
capacitanceisabove3,000µf,theselectionofoutputcapacitorsbecomesmoreimportant.
table1.输入/outputcapacitors
CapacitorCharacteristicsQuantity
MaxRipple
capacitorvendor,vendor
WorkingMaxESROptional
ValueCurrentatPhysicalSizeInput
类型/序列(样式)partnumber
Voltageat100kHzOutput
(µf)85
°
c(irms)(mm)总线
(v)(
Ω
)总线
(毫安)
panasonic,aluminum253300.09077510
×
12.521eeufc1e331(v
O
≤
2.1v,
orV
O
>2.1vand
I
O
≤
10a)
fc(放射状的)255600.065120512.5
×
1511EEUFC1E561S
251,0000.060110012.5
×
13.511eevfk1e102q
(v
O
≤
3.4vandi
O
≤
16a)
fk(smd)356800.060110012.5
×
13.511eevfk1v681q
(v
O
≤
3.4vandi
O
≤
16a)
unitedchemi-con163300.018450010
×
10.52
≤
316FX330M
fx,os-con(smd)163300.09076010
×
12.521lxz25vb331m10x12ll
(v
O
≤
2.1v,orv
O
>2.1v
andI
O
≤
10A
lxz,铝(放射状的)256800.068105010
×
1611LXZ16VB681M10X16LL
(v
O
≤
3.4vandi
O
≤
16a)
ps,poly-铝(放射状的)163300.014506010
×
12.52
≤
216PS330MJ12
pxa,poly-铝(smd)163300.014505010
×
12.22
≤
3PXA16VCMJ12
nichicon,aluminum255600.060106012.5
×
1511UPM1E561MHH6
(v
O
≤
3.4vandi
O
≤
16a)
hd(放射状的)256800.038143010
×
1611UHD1C681MHR
pm(放射状的)355600.048136016
×
1511UPM1V561MHH6
panasonic,poly-铝
一个(smd)163300.022410010
×
10.22
≤
3EEFWA1C331P
s/se(smd)6.31800.00540007.3
×
154.3
×
4.2n/r
(1)
≤
1EEFSE0J181R
(v
O
≤
5.1v)
Sanyo
tp,psocap103300.02530007.3l
×
5.7wn/r
(1)
≤
410TPE330M
sp,os-con162700.018>350010
×
10.52
(2)
≤
316SP270M
svp,os-con(smd)163300.016470011
×
122
≤
316SVP330M
avx,tantalum,seriesiii104700.045>1723n/r
(1)
≤
5TPSE477M010R0045
(v
O
≤
5.1v)
7.3l
×
5.7w
×
4.1h
tps(smd)103300.045>1723n/r
(1)
≤
5TPSE337M010R0045
(v
O
≤
5.1v)
kemet(smd)
(1)n/r–notrecommended.thevoltageratingdoesnotmeettheminimumoperatinglimits.
(2)totalcapacitanceof540µfisacceptablebasedonthecombinedripplecurrentrating.
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