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CapacitorTable
DesigningforFastLoadTransients
PTV12010L
PTV12010W
SLTS234–DECEMBER2004
applicationinformation(持续)
Table1identifiesthecharacteristicsofcapacitorsfromanumberofvendorswithacceptableESRandripple
电流(rms)比率.therecommendednumberofcapacitorsrequiredatboththeinputandoutputbusesis
identifiedforeachcapacitortype.
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.
table1.输入/outputcapacitors
CapacitorCharacteristicsQuantity
最大值.irms
capacitorvendor,
Vendor
WorkingMaxESRRipplePhysicalOptional
类型/序列
ValueInput
PartNumber
Voltageat100kHzCurrentSizeOutput
(样式)
(µf)总线
(v)(
Ω
)at85
°
c(mm)总线
(毫安)
panasonic,aluminum253300.09075510
×
12.511eeufc1e331
fc(放射状的)351800.09075510
×
12.511eeufc1v181
fk(smd)254700.08085010
×
10.211eevfk1e471p
unitedchemi-con
pxa,poly-铝(smd)161500.026343010
×
7.71
≤
4PXA16VC151MJ80TP
fp,os-con(放射状的)201200.02431008
×
10.51
≤
420FP120MG
fs,os-con(smd)201000.03027408
×
10.51
≤
420FS100M
lxz,铝(放射状的)352200.09076010
×
12.511lxz35vb221m10x12ll
nichicon,铝
hd(放射状的)252200.0727608
×
11.511uhd1e221mpr
pm(放射状的)352200.09077010
×
1511UPM1V221MHH6
panasonic,poly-铝
wa(smd)161000.03925008
×
6.91
≤
5EEFWA1C101P
s/se(smd)6.3
(1)
1800.00540007.3
×
4.3n/r
(2)
≤
1EEFSE0J181R
×
4.2(v
O
≤
5.1v)
Sanyo
svp,os-con(smd)201000.024>33008
×
121
≤
420SVP100M
sp,os-con201200.024>31008
×
10.51
≤
420SP120M
tpe,pos-cap(smd)102200.025>24007.3
×
5.71
≤
410TPE220ML
avx,tantalum,tps(smd)101000.100>1090n/r
(2)
≤
5TPSD107M010R0100
7.3l
×
5.7w
102200.100>1414n/r
(2)
≤
5TPSV227M010R0100
×
4.1h
25680.095>14512
≤
5TPSV686M025R0095
kemet(smd)
t520,poly-tant(smd)101000.0801200n/r
(2)
≤
5T520D107M010AS
7.3l
×
5.7w
×
4H
t495,tantalum(smd)101000.100>1100n/r
(2)
≤
1T495X107M010AS
vishay-sprague
(1)thevoltageratingofthiscapacitoronlyallowsittobeusedforoutputvoltagesthatareequalto,orlessthan,5.1v.
(2)n/r–notrecommended.thevoltageratingdoesnotmeettheminimumoperatinglimits.
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