SMRT283R3SSLASHKR datasheet(4/44 Pages) INTERPOINT

4 / 44 page

TRIMDOWNUSINGTRIMPIN,ALLMODELS

Totrimtheoutputvoltagelowerthanthenominalsetpoint,

connectRTRIMasshowninFigure1.ThevalueofRTRIMis

calculatedbythefollowingequation:

FOrMula 1: trIM dOwn uSIng trIM pIn

RTRIM=K

OUT–VMIN

)/(VNOM–VOUT)

Where:

K=MultiplicationconstantfromTable3

VOUT=Desiredoutputvoltage(mustbegreaterthanVMIN)

VMIN=MinimumoutputvoltagefromTable3

VNOM=Nominalsetpointvoltageoftheconverter

NOTE:

Donotexceedmaximumcurrentratingwhentrimmingdown.

TRIMUPUSINGTRIMPIN,ALLMODELS

Totrimtheoutputvoltagehigherthanthenominalsetpoint,

connectRTRIMasshowninFigure2.ThevalueofRTRIMis

calculatedbythefollowingequation:

FOrMula 2: trIM up uSIng trIM pIn

RTRIM=K

MAx–VOUT

)/(VOUT–VNOM)

Where:

K=MultiplicationconstantfromTable4

VOUT=Desiredoutputvoltage(mustbelessthanVMAx)

VMAx=MaximumoutputvoltagefromTable4

VNOM=Nominalsetpointvoltageoftheconverter

NOTE:

Donotexceedmaximumpowerratingwhentrimmingup.

TRIMUPUSINGSENSEAPINONDUALMODELSONLy

TrimUpVOUTA

Inadditiontoremotesensing,theSenseApinmaybeusedto

increasetheregulatedoutputvoltageattheVOUTApin.This

isaccomplishedbyattachingaresistor(RADJUST)betweenthe

SenseApin(pin8)andtheVOUTApin(pin11).Thevalueof

RADJUSTiscalculatedbythefollowingequation:

FOrMula 3: trIM up uSIng SenSe a pIn

RADJUST= 240 (Vout–Vnom ) / (K + (Vmax–Vout))

Where:

VOUT=Desiredoutputvoltage(mustbelessthanVMAx)

VNOM=Nominalsetpointvoltageoftheconverter

VMAx=Maximumachievableoutputvoltage

NOTE:

Donotexceedmaximumpowerratingwhentrimmingup.

VNOM

VMAx

%ofVNOM

3.3

3000

3.70

112

5singleandtriple

3000

6.26

125

5dual

5280

5.82

116

5300

8.27

118

8.7

5300

10.46

120

5300

14.69

122

5300

18.54

124

VNOM

VMIN

%OFVNOM

3.3

3500

3.18

5singleandtriple

4520

4.16

5dual

7040

4.38

8020

5.47

8.7

9040

6.13

11030

7.05

12900

7.65

Output VOltage trIM detaIlS (cOntInued)

table 3: trIM dOwn cOnStantS when uSIng trIM pIn

table 4: trIM up cOnStantS when uSIng trIM pIn

table 5: trIM up cOnStantS when uSIng SenSe pIn On

Output a OF dual Output MOdelS

VNOM

VMAx

%ofVNOM

6.00

120

0.98

12.98

108

1.134

16.13

107.5

Crane Aerospace & Electronics Power Solutions

www.craneae.com/interpoint

Page4of44

sMrt single, dual and triple space dc-dc converters

19-56 Volt input – 35 Watt – space qualiFied

SMRT28RevAJ-2016.05.03

SMRT283R3S/KR Datasheet(PDF) 4 Page - Interpoint Corporation Company

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