AGQ100-48S12 DC-DC Converter TRN
10/16
TheꢀvoltageꢀbetweenꢀpinꢀRemoteꢀON/OFFꢀandꢀpinꢀVinꢁꢀmustꢀnotꢀexceedꢀtheꢀrangeꢀlistedꢀinꢀtableꢀ
“Featureꢀcharacteristics”ꢀtoꢀensureꢀproperꢀoperation.ꢀTheꢀexternalꢀremoteꢀON/OFFꢀcircuitꢀisꢀhighlyꢀ
recommendedꢀasꢀshownꢀinꢀFigureꢀ13.ꢀ ꢀ
Vin+
Vo+
S+
Vin+
Vo+
S+
Remote
ON/OFF
Remote
ON/OFF
Trim
Trim
Sꢁ
Sꢁ
Vinꢁ
Voꢁ
Vinꢁ
Voꢁ
IsolatedꢀremoteꢀON/OFFꢀcircuit
NonꢁisolatedꢀremoteꢀON/OFFꢀcircuit
ꢀ
Figureꢀ13ꢀ ꢀ ExternalꢀremoteꢀON/OFFꢀcircuitꢀ
TrimꢀCharacteristicsꢀ
Connectingꢀ anꢀ externalꢀ resistorꢀ betweenꢀTrimꢀ pinꢀ andꢀ Voꢁꢀ pinꢀ willꢀ decreaseꢀ theꢀ outputꢀ voltage.ꢀ
Connectingꢀ itꢀ betweenꢀ Trimꢀ pinꢀ andꢀ Vo+ꢀ pinꢀ willꢀ increaseꢀ theꢀ outputꢀ voltage.ꢀ Theꢀ followingꢀ
equationsꢀdetermineꢀtheꢀexternalꢀresistanceꢀtoꢀobtainꢀtheꢀtrimmedꢀoutputꢀvoltage.ꢀ
511
Radj−down
=
−10.22(Kꢀ) ꢀ
ꢁ
5.11×Vnom
×
100 + ꢁ
511
Radj−up
=
−
−10.22(Kꢀ) ꢀ
1.225× ꢁ
Vnom −Vdesired
ꢁ
ꢁ =
×100ꢀ
Vnom
Vnorm
:ꢀNominalꢀoutputꢀvoltage.ꢀ
Forꢀexample,ꢀtoꢀgetꢀ13.12Vꢀoutput,ꢀtheꢀtrimmingꢀresistorꢀisꢀ
5.11×12×
100 +10
511
10
Radj
=
−
−10.22(Kꢀ) = 489.3(Kꢀ)ꢀ
−up
1.225×10
TheꢀoutputꢀvoltageꢀcanꢀalsoꢀbeꢀtrimmedꢀbyꢀpotentialꢀappliedꢀatꢀtheꢀTrimꢀpin.ꢀ ꢀ
Vo = (Vtrim +1.225)×6.122
ꢀ
WhereꢀVtrimꢀisꢀtheꢀpotentialꢀappliedꢀatꢀtheꢀTrimꢀpin,ꢀandꢀVoꢀisꢀtheꢀdesiredꢀoutputꢀvoltage.ꢀ
Vo+
S+
Vo+
S+
Load
Load
R
trimꢀ_down
Trim
Trim
R trimꢀ_up
Cout
Cout
Sꢁ
Sꢁ
Voꢁ
Voꢁ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ
Figureꢀ14ꢀ ꢀ Trimꢀupꢀ ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Figureꢀ15ꢀ ꢀ Trimꢀdownꢀ
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