EN/LZT146064R2A EricssonPowerModules,March2007
PMC8818TSDatasheet
Vout(V)
Radj(kohm)
Vtrim(V)
0.75
Open
1.0
41.42
0.684
1.2
22.46
0.670
1.5
13.05
0.650
1.8
9.024
0.630
2.5
5.009
0.583
3.3
3.122
0.530
5.00
1.472
0.417
5.50
1.212
0.383
Circuitconfigurationforoutputvoltageadjust
Increase
+Out
GND
Vadj
Load
Radj
Sense
Operating Information
Remote Control (RC)
StandardVersionwith"positivelogic".
RC
Regulator
condition
min
typ
max
Unit
Lowlevel
referencedtoGND
OFF
-0.3
0.3
V
Open
ON
1.7
16
V
TheRCpinmaybeusedtoturnonorturnofftheregulatorusinga
suitableopencollectorfunction.
TurnoffisachievedbyconnectingtheRCpintoground.
TheregulatorwillruninnormaloperationwhentheRCpinisleft
open.
RC
+IN
Module
+IN
GND
Input Voltage
Theinputvoltagerange8.3…16VdcmakesthePMC8000easy
touseinintermediatebusapplicationswhenpoweredbyanon-
regulatedbusconverteroraregulatedbusconverter.Foroutput
voltagetrimsover5.25Vouttheinputvoltagemustbereducedtoa
maximumof14Vinordertomaintainspecifieddata.
RC
Regulator
condition
min
typ
max
Unit
Highlevel
referencedtoGND
OFF
1.7
16
V
Open
ON
TheRCpinmaybeusedtoturnonorturnofftheregulatorusinga
suitableopencollectorfunction.
TurnoffisachievedbyconnectingtheRCpintotheinputvoltage.
TheregulatorwillruninnormaloperationwhentheRCpinisleft
open.
RC
Vi
Module
Vi
GND
Option"negativelogic"
Output Voltage Adjust (Vadj)
AllPMC8000SeriesDC/DCregulatorshaveanOutputVoltage
adjustpin(Vadj).Thispincanbeusedtoadjusttheoutputvoltage
aboveoutputvoltageinitialsetting(0.75V).Whenincreasingthe
outputvoltagethemaximumpowerratingoftheconverterremains
thesame,andtheoutputcurrentcapabilitywillthereforedecrease
correspondingly.Toincreasetheoutputvoltagearesistororavolt-
agesignalshouldbeconnected/appliedbetweenVadjpinandGND.
Theresistor/voltagesignalvalueforsomestandardoutputtrimsare
givenbelow,forothervoltagesetpointsusetheformulastocalcu-
latethecorrectresistororvoltagesignal.Foroutputvoltagesof5.25
Vandhighertheinputvoltageisrestrictedtomaximum14Vin.
Formula1:Radj=(10500/(Vout–0.7525))–1000(ohm)
Formula2:Vtrim=(0.7–0.0667x(Vout–0.7525))(V)
Turn off input voltage
ThePMC8000SeriesDC/DCregulatorsmonitortheinputvoltage
andwillturnonandturnoffatpredeterminedlevels.Theminimum
hysteresisbetweenturnonandturnoffinputvoltageis0.2Vwhere
theturnoninputvoltageisthehighest.