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DesigningforLoadTransients
PTH04000W
SLTS247A–JUNE2005–REVISEDJULY2005
thetransientresponseofthedc/dcconverterhasbeencharacterizedusingaloadtransientwithadi/dtof1
一个/µs.thetypicalvoltagedeviationforthisloadtransientisgiveninthedatasheetspecificationtableusingthe
optionalvalueofoutputcapacitance.asthedi/dtofatransientisincreased,theresponseofaconverter's
regulationcircuitultimatelydependsonitsoutputcapacitordecouplingnetwork.thisisaninherentlimitationwith
anydc/dcconverteroncethespeedofthetransientexceedsitsbandwidthcapability.ifthetargetapplication
specifiesahigherdi/dtorlowervoltagedeviation,therequirementcanonlybemetwithadditionaloutput
capacitordecoupling.inthesecases,specialattentionmustbepaidtothetype,值,andesrofthe
capacitorsselected.
ifthetransientperformancerequirementsexceedthosespecifiedinthedatasheet,theselectionofoutput
capacitorsbecomesmoreimportant.reviewtheminimumesrinthecharacteristicdatasheetfordetailsonthe
capacitancemaximum.
table3.recommendedinput/outputcapacitors
(1)
CAPACITORCHARACTERISTICSQUANTITY
85°C
capacitorvendor/
相等的
VENDOR
MAXIMUMPHYSICAL
组件
WORKINGVALUESERIESINPUTOUTPUT
号码
RIPPLESIZE
序列
VOLTAGEµFRESISTANCEBUS
(2)
总线
电流(mm)
(等效串联电阻)
(i
rms
)
panasonicwa(smt)10v1200.035
Ω
2800ma8×6,91
≤
4
(2)
EEFWA1A121P
(3)
fc(smt)25v470.400
Ω
230ma8×6,211
(2)
EEVFC1E470P
(3)
6.3v470.018
Ω
2500ma7,3×4,31
≤
2EEFCD0J470R
panasonicslsp-cap(smt)
6.3v560.009
Ω
3000ma7,3×4,31
≤
1EEFSL0J560R
unitedchemi-conpxa(smt)10v470.031
Ω
2250ma6,3×5,711pxa10vc470mf60tp
fs10v1000.040
Ω
2100ma6,3×9,81
≤
310FS100M
lxz16v1000.250
Ω
290ma6,3×11,511lxz16vb101m6x11ll
mvz(smt)16v1000.440
Ω
230ma6,3×5,711mvz16vc101mf60tp
nichiconuwg(smt)16v1000.400
Ω
230ma8×6,211uwg1c101mcr1gs
f559(tantalum)10v1000.055
Ω
2000ma7,7×4,31
≤
3F551A107MN
pm10v1000.550
Ω
210mA6×1111UPM1A101MEH
sanyoos-con\pos-capsvp10v680.025
Ω
2400ma7,3×4,31
≤
310TPE68M
(smt)6.3v470.074
Ω
1110mA5×61
≤
36SVP47M
sp10v560.045
Ω
1710ma6,3×51
≤
310SP56M
10v470.100
Ω
1100ma7,3l×4,31
≤
3TPSD476M010R0100
avxtantalumtps(smd)
10v470.060
Ω
>412maw×4,1h1
≤
53TPSB476M010R0500
kemett520(smd)10v680.060
Ω
>1200ma7,3l×5,71
≤
3T520V686M010ASE060
ao-cap6.3v470.028
Ω
>1100maw×4h1
≤
3A700V476M006AT
vishay/sprague594d/595d10v680.100
Ω
>1000ma7,3l×6w1
≤
3594D686X0010C2T
(smd)10v680.240
Ω
680ma×4,1h1
≤
3595D686X0010C2T
94sl16v470.070
Ω
1550mA8×51
≤
394SL476X0016EBP
7,5l
×
4,0
tdkceramicx5r(含铅的)10v470.005
Ω
>1400ma
≥
1
≤
2FK22X5R1A476M
W
×
8,0h
tdkceramicx5r6.3v220.002
Ω
>1400ma1210case
≥
2
(4)
≤
3c3225x5r0j226kt/mtgr
murataceramicx5r6.3v220.002
Ω
>1000ma3225mm
≥
2
(4)
≤
3M32ER61J223M
kemet6.3v220.002
Ω
>1000ma
≥
2
(4)
C1210C226K9PAC
tdkceramicx5r6.3v470.002
Ω
>1400ma1210case
≥
1
≤
2c3225x5r0j476kt/mt
murataceramicx5r6.3v470.002
Ω
>1000ma3225mm
≥
1
≤
2grm32er60j476m/6.3
kemet6.3v470.002
Ω
>1000ma
≥
1
≤
2C1210C476K9PAC
(1)checkwithcapacitormanufacturersforavailabilityandlead-freestatus.
(2)aceramiccapacitorisrequiredontheinput.anelectrolyticcapacitorcanbeaddedtotheoutputforimprovedtransientresponse.
(3)anoptionalthrough-holecapacitoravailable.
(4)atotalcapacitanceof44µfisanacceptablereplacementforasingle47-µfcapacitor.
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