POWER DESIGNS 6050 Instruction manual

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TECHNICALDATA
MODEL6050
MULTI-RANGE DC POWERSOURCE
0-7Vat5A
0-15V at3A
0-25Vat2A
0-50Vat 1A
0-60Vat0.5A
MODEL6050 UNIPLY™
is a regulatedDC power sourcethat functionallyre-
placesfive conventional power supplies.It utilizes a
new regulator technique which provides additional
featuresnot availablein standard instruments.
Outputvoltageandcurrent rangescoverabroad spec-
trumof laboratory requirementsforboth digitaland
analog applications.
Rangingistransient-freeand automaticwith changes
in loadandthesettingofvoltageandcurrent controls.
Operationis completely electronic, without relaysor
manual switching.
The RFI-free regulator system employs linear circuits
only.NoSCR's,switchingtransistorsorhigh frequency
techniquesare utilized.
Power output capabilityofthe supply increaseswith
increasingAClinevoltage.Uptotwice ratedoutputis
"Patents appliedfor
POWER DESIGNSINC.
1700 SHAMESOR.• WESTBURY, l\l. Y.11590
SIS EOgewood 3-6200 TWX: 510-828-6561
availableatline voltagesover105volts. Useful regu-
lated outputat reduced levelsis availabledownto a
linevoltageof85volts.
A flashing panel indicator signalslossof regulation
whenload demandsarein excessof control settings
or theACline voltageistoolowto support increased
output levels.
The supplymaybe operated continuouslyintoan
overloador short circuit without damage.
Regulator efficiencyis superiorto conventional,wide
voltage range, dissipativetype systems.
Portableand light,the Model6050is designedfor
laboratory benchorrackuse.A bail/carrying handle
assembly permits tiltingofthe front panelfor viewing
ease. 5
lA"
panel adaptersare availablefor assem-
blingoneortwo unitsina standard19" rack.
SERIALNO: 70-3
POWER DESIGNS PACIFIC INC.
33B1 MIRANDAAVE.• PA L O ALTO,CAL. 94306
415-321-6111TWX: 910-373-1251

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TECHNICALDATA
MODEL6050
DESIGN FEATURES
• Concentric coarseandfinevoltage controlswitha reso-
lutionof3 millivolts.
•Dual range 0.5/5.0 ampere current limiter. Meter range
shifts automatically.
• Remotevoltage programmingat500ohms/volt.
• Remote sensingof output voltage.
• Frontandrear access output terminals.
• Parameter specifications basedon anticipated perfor-
manceafterfiveyearsofservice.
• Semiconductors processed undera "predictable relia-
bility" programto insurelonglife expectancy.This
program includes source codingofall devices,100%
incoming inspectionand measurementof parameters
beyond operating regionsto expose channelingphe-
nomena, surface contamination,safe operating areas,
etc.Zenervoltage referencesandinputstage transistors
are preagedandlife expectancy extrapolated through
l/F noise change techniques during burn-in.
•Each power supply operated undermaximum stress con-
ditionsforaminimumof fifty hours priorto final inspec-
tion.
• Manufacturing proceduresand processesare equalto
or exceed thoseof MIL-Q-9858.
ELECTRICAL SPECIFICATIONS
Input:105-125volts,57-440Hz,100wattsnominal.
Output:0-60voltsDC,continuously adjustablewiththe fol-
lowing minimum output:
0-7V,0-5A 0-25V,0-2A 0-60V,0-0.5 A
0-15 V, 0-3 A 0-50 V, 0-1 A
LineRegulation:0.01%+1 millivoltforlinevariationsfrom
105-125volts.
LoadRegulation: 0.01 %+1millivoltforloadvariationsfrom
0-100%of ratedoutputcurrent, measuredatrear terminals
or atthejunctionofloadandsense leads.Without remote
sensing, regulationatfront panel terminalsis 0.01%+1.5
millivoltper ampereof output current(dueto bindingpost
voltagedrops).
Polarity:Eitherpositiveornegativeoutputterminalmaybe
operatedat ground potential.
Rippleand Noise:Lessthan1 millivolt peak-to-peakover
0-1MHzbandwithan inputlinefrequencyof60Hz.
Source Impedance:Lessthan0.005ohmatDC,0.1ohm
to 20 KHz, 1.0 ohmto 1 MHz.
Recovery Time:Lessthan50 microsecondsto returnto
withina 15millivoltbandofthe original voltagefora step
changein ratedloadof10%to100%(1microsecondrise
time).
Stability:Lessthan 0.02%+3 millivoltsper24hours after
warm-upat constant line,loadand ambient temperature.
Lessthan 0.01%+1 millivoltwith external remotepro-
gramming resistance.
Operating Temperature: 0-50°C atfull load. Storage:
-20°Cto +85°C.
Temperature Coefficient:Lessthan 0.02%per degreeC.
CurrentLimiting: Concentric switch/potentiometerpro-
vides continuous adjustmentof output currentintwo
ranges:0-500 milliamperes, 0-5 amperes.
Metering: Front panel "edgewise" meteranda selector
switch permits monitoring outputvoltageorcurrentwithan
accuracyof±2%offullscale.Currentrangechangesauto-
maticallywith current limiter range switch.
OutputTerminals:
Front Panel:Three insulated,5-way binding postsfor posi-
tive, negativeandground.
Rear Panel: Seven screw terminalsona molded barrier
blockfor positiveand negative output, chassis ground,re-
motevoltageprogrammingandremote sensing.
RemoteProgramming:Rear panel terminalsare provided
for external resistance programmingofthe output voltage.
The ratioofthe programming resistanceto output voltage
is 500ohmspervoltwitha ratio accuracyof±5%,and a
programminglinearityof 0.01 %ofmaximumoutputvoltage.
MECHANICAL SPECIFICATIONS
Dimensions: 8%" widex 4%" highx 11%" deep.
Weight: 15K
2
lbs.
Finish: Brushed anodized natural aluminum etched panel
with black nomenclature.Blue vinyl laminated steeldust
cover.Gold iridite bottom plate.
RackPanel Adapters: Brushed aluminum finished panel
5)4" x19"for mountinga single Model 6050:TypeRRG-3
(unit mountsincenterof panel),Type RRG-1 (unit mounts
leftorrightsideof panel).
Brushed aluminum finished panel 5%" x 19"for mounting
two Model6050units,sidebyside:TypeRRG-2.
Price: $12.50each.
PRICE: $195.00 F.O.B. Westbury,New York.
Pricessubjecttochangewithoutnotice
PairofpowersuppliesintypeRRG-2PanelAdapter
UnitshowniscalibratedpowersourceModel2005A
POWER DESIGNSINC.
1700 SHAMESDR.•WESTBURY, IM. Y . 11590
SIB EOgewood 3-BSOO TWX: 510-322-6561
POWER DESIGNS PACIFIC INC.
3381 MIRANDA AVE.• P A L O ALTO,CAL. 94306
41S-321-B111 TWX: 310-373-1881

UNIVERSALDCPOWERSOURCEMODEL6050
SECTION 1
GENERALDESCRIPTION
1-1.DESCRIPTION
The Model6050isa wide-range regulatedDCpower supplyutilizinga new regulator
technique*toprovidea broader spectrumof outputvoltagesandcurrentsthanis normally
availableina single unit.
The system employslinearcircuitryonlyandis RFI-free. Operationis completely
electronicwiththeregulator automatically seekingthatmodeofoperation which satisfies
the settingsofthepanelcontrols,theloaddemandandtheleveloftheACinputvoltage.If
theregulator cannot sustainits function,it signalsthis inabilitybya flashing panel indicator.
Thepower outputcapabilityofthe Model6050increaseswithACinputvoltages above
105volts. Useful regulated outputatreducedlevelsis availabledownto85volts.
1-2. ELECTRICAL SPECIFICATIONS
INPUT: 105-125volts, 57-440 Hz,100watts nominal.
OUTPUT:0-60 voltsDC, continuously adjustablewiththe following minimum output:
0-7V,0-5A;0-15V,0-3A;0-25V,0-2A,0-50V,0-1A;0-60V, 0-0.5 A
LINEREGULATION: 0.01% +1millivoltforlinevariationsfrom 105-125 volts.
LOADREGULATION: 0.01% +1millivoltforloadvariationsfrom 0-100%ofrated output
current, measuredatrear terminalsoratthe junctionofloadandsense leads. With-
outremote sensing, regulationatfront panelterminalsis 0.01% +1.5 millivoltsper
ampereofoutputcurrent(duetobindingpostvoltage drops).
POLARITY: Either positiveor negative outputterminalmay be operatedatground potential.
RIPPLEANDNOISE:Lessthan1millivoltpeak-to-peakover0-1MHzbandwithan input
linefrequencyof60Hz.
SOURCEIMPEDANCE:Less man 0.005 ohmatDC, 0.1 ohmto20KHz, 1.0 ohmto1MHz.
RECOVERY TIME:Lessthan50microsecondstoreturntowithina 15millivoltbandofthe
original voltagefora stepchangeinratedloadof10%to100%(1microsecondrise time).
STABILITY:Lessthan 0.02% +3millivoltsper24hours after warm-upatconstantline,load
and ambienttemperature.Lessthan 0.01% +1millivoltwithexternalremote program-
ming resistance.
*"UNIPLY" patents appliedfor.
9471-1

6050
OPERATINGTEMPERATURE:0-50°C at full load. Storage: -20°C to +85°C.
TEMPERATURE COEFFICIENT:Lessthan 0.02% per °C.
CURRENTLIMITING: Concentric switch/potentiometer provides continuousadjustment
of outputcurrentintworanges: 0-500 milliamperes, 0-5 amperes.
METERING: Frontpanel "edgewise"meteranda selector switchpermitmonitoringoutput
voltageorcurrentwithanaccuracyof±2%offull scale. Currentrangechangesauto-
maticallywithCURRENTLIMITER range switch.
OUTPUTTERMINALS: Front Panel- Three insulated, 5-way bindingpostsfor positive,
negativeandground.Rear Panel- Seven screw terminalsona moldedbarrier block
for positiveandnegative output, chassis ground, remote voltage programmingand
remote sensing.
REMOTEPROGRAMMING:Rear panelterminalsare providedfor external resistance
programmingofthe outputvoltage.Theratiooftheprogrammingresistance to
outputvoltageis500ohmspervoltwitha ratio accuracyof ±5% anda program-
ming linearityof 0.01% of maximum output voltage.
1-3.MECHANICAL SPECIFICATIONS
DIMENSIONS: 8-3/8"widex 4-3/4"highx 11-9/16" deep.
WEIGHT: 15-1/2lbs.
FINISH: Brushed natural aluminumetchedand anodized panelwithblack nomenclature.
Blue vinyl laminated steeldustcover.Goldiridite bottomplate.
9471-2

6050
SECTION 2
INSTALLATIONANDOPERATION
2-1. INSTALLATION
2.1.1 Laboratory Bench.The Model6050isa self-containedunitdesignedfor bench
use. Nopreliminary processingor unpackingisrequired.Thepower supplyisreadyfor
operationas shippedfromthefactory.A snap-out, bail-carrying handle assembly tilts
thefront panelfor viewingease.
2.1.2 Rack Mounting. Brushednatural aluminumfinish 5-1/4"x 19" adapters
are availablefor mountingoneortwounitsina standard 19" relayrack.Type RRG-3
mountsa singleunitinthecenterofthepanel.Type RRG-1 mountsa singleunitoneither
theleftor rightsideofthepanelfor installationof auxiliary instrumentation.Type RRG-2
mountstwo Model 6050's sidebysideona single adapter. Assemblyhardwarekitsare
providedwitheachadapter. If theplastic bumperfeetandhandle assembly interferewith
adjacent equipment, removethembydisassemblingthebottomplateofthe supply.
2-2. OPERATION
2.2.1 Operating Procedure
(a)BesuretheAC switchisoffandshortinglinksonrear terminal block
betweentheDC+andSENSE+,DC-andSENSE-,1and2 are tightened securely.
(b)SettheCURRENTLIMIT smallbarknobtothedesired output current
range.Notethatthefull scale readingofthe meterwillcorrespondtothe switch position.
Setthe largeCURRENTLIMITADJUSTcontrolfully clockwise.
(c)Setthe metermodeswitchtoVOLTS.
(d) ConnecttheAClinecordtoa sourceof 105-125volts, 57-440Hz.
(e)Ifremote sensing, remote programming, current limitingor series
operationisdesired,seerelevantparagraphsinthis section.
(f)TurnACswitchon.ACindicator should light.
(g)SetthelargeVOLTAGEcontroltothedesired valueofoutputvoltage.
TheFINEADJconcentric controlpermitsfine adjustmentoftheoutputvoltagewith a
resolutionof3 millivolts.
(h) ConnecttheDC+andDC-outputterminalonthefront panelandrear
panel to theload.Thepositiveor negative outputterminalmaybeoperatedatground poten-
tialbymeansofa jumperorleft floating,ifdesired.Iftheoutputterminalsareleft
floating,alargeACpotentialattheACline frequencymaybe introducedintotheload
9472-1

6050
throughcommonmodecouplingbetweentheACline,powersupply,loadandACline
operatedinstrumentsconnectedtotheload.Acapacitor(about1microfarad,100VDC,
paperorfilm dielectric)connectedfrom eitherDCoutputterminaltogroundterminal
willreducethisrippletoa satisfactory level.
2.2.2 OperationAboveRatings
Theoutputvoltageandcurrentratingsofthesupplyarelistedonthefront panel
abovethemeter.At AC inputlinevoltagesover105volts,thepowersupplymaybe
operatedatvoltageandcurrent levelsabovetheseratingswithoutsupplyoverloador
damage.Simplyincreasetheoutputvoltageoroutputloadcurrenttothedesiredvalue.
H thepowersupplyregulator systemcannot supporttheincreasedoutputduetopossible
linevoltageinadequacyorsupplylimitations,itwill signalthisinabilitybytheflashing
LIMITindicator.Thepowersupplymaybeoperatedindefinitelyintothisoverloadmode
(flashing indicator)withoutdamage.
Similarly,thesupplymaybeoperatedbelow105linevoltsatreducedoutputlevels.
Theflashing limit indicator willfunctionasa guidetoregulator capability.
TheCURRENTLIMITcontrolswillcontinuetofunctionevenwhenthepowersupply
is operatedbeyondtheratingsonthefrontpanel.Itmaystillbeusedtolimitmaximum
outputcurrentsbyadjustmentofthesecontrols.
Whenoperatingthesupplyaboveratings,thelimit indicatormaysuddenlystartto
flash.This signalsthattheACinputvoltagehasdroppedbelowa levelnecessarytosup-
porttheincreasedoutputpower.
NOTE:NeveroperatetheModel6050aboveitsmaximumratedACinputlinevoltageof
125volts for increasedpoweroutput.
2.2.3 RemoteSensing
The regulator systemoftheModel6050isanoperational amplifierwithinput
terminals (senseleadsS+and S-) maintainingtheregulatedoutputvoltageatthepointof
connectiontothepositiveandnegativepoweroutputterminalsof tiie supply(DC+andDC-).
Whentheseleadsareconnectedatthesupply (shortinglinksbetween Sense* andDC+,
Sense-andDC-on the rear terminalblock),thepowersupplyisconnectedfor localsens-
ing.Whenthe shortinglinksareremovedandthe senseleadsconnectedtothepower
outputleadsattheload,thesupplyisconnectedfor remote sensingandtheoutputvoltage
is compensatedforvoltagedropsduetotheDCresistanceofthepowerleads.
Remote sensingmayintroduce substantialphaseshiftathighfrequenciesbetween
the sense(input)terminalsofthe amplifierandthepower(output)terminalsduetothe
inductivereactanceofthe senseandloadleads.Thisconditionmaybecorrectedbythe
additionofa highfrequency,low impedance capacitor acrosstheoutputofthesupplyat
thejunctionoftheloadandsenseleads.Atantalumor electrolytic capacitorof suitable
voltageratingandlowimpedancecharacteristicsshouldbeused.Thecapacitanceshould
be largeenoughtocorrectforpoordynamicregulationduetothereactanceofthepower
outputleadsifthe load isswitchedor pulsed.
" « 2-2

G050
For remote sensing:
(a) Removethe shortinglinksfromtherear terminal blockDC+and Sense+
andDC-andSense- terminals.
(b) Connectthe DC+ andDC-terminalstothe load.Usetwisted#18AWG
or heavierwirefor minimum reactance.
(c) Connectthe Sense+andSense- leadstothepositiveandnegative power
leadsatthe load.Runthe sense leadsasa tightlytwisted, shieldedpair,ifpossible.Wire
sizeisnotimportantunlesslongrunsare involved (over twentyfeet). Connectthe shieldto
GROUNDterminalatthe supplyto minimize electrostatic noise pickup.
2.2.4 Serie s Oper ation
As manyasthree Model6050suppliesmaybeconnectedinseriestoprovideupto
180volts output,at 0.5 ampereorupto21voltsat5 amperes. ConnectthepositiveDC
outputterminalofone supplytothenegative outputterminalofthenext,in Hie same manner
as connectingbatteriesinseries.The groundterminalsonallunitsmaybeleftfloatingor
tiedtogetherandconnectedtoeitherthemostpositiveormostnegative output terminal.
CAUTION:THEVOLTAGEANDCURRENTLIMITCONTROLSOFALL SERIESCON-
NECTEDMODEL6050UNITSSHOULDBESETATTHESAME LEVELTO
AVOIDHEAVYREVERSECURRENTSFLOWINGINONEOFTHE SUPPLIES
WHENTHEREGULATORISINTHECURRENT LIMITEDMODEANDTHE
OUTPUTISREVERSEDBYTHEOTHER SERIES-CONNECTED SUPPLIES.
THEMODEL6050SHOULDNEVERBE OPERATEDINSERIESWITHANY
OF THELIMITINDICATOR LAMPSFLASHINGFORMORETHANA SHORT
PERIOD.
For optimum voltage regulation, disconnectthe shorting linksbetweenall Sense+
andDC+outputterminals exceptthoseatthemostpositive potential.Thenconnect jumper
wiresbetweeneach Sense+andSense-terminalonthenextmore positive power source.
Thevoltage dropsinthe leadsconnectingthepower sourceswillbe compensatedforbythe
regulator circuitsofthe individualunits.For remote sensing, follow these directions,
exceptconnect the mostpositiveandmost negative Sense+and Sense- leads acrossthe
load.
2.2.5 Parallel Operation
Parallel operationofthe Model6050isnot recommended.
2.2.6 Remote Voltage Programming
Theoutputvoltage can beprogrammed remotelybyanexternalfixedor variablere-
sistanceas follows:
(a)Turnoffthe power source.Setboth voltagecontrolstozero (extreme
counterclockwise position).
947 2-3

6050
(b) Removethe shortinglinkfrom betweentherear panel1and 2
terminals.
(c) Selecta programmingresistanceby multiplyingthe desired output
voltageby500(theprogrammingconstantis500ohmsper volt).Aconstantcurrentof
2milliampereswillflow throughthisresistance,andthewattage rating shouldbe chosen
to minimize driftdueto heating.
(d) Connecttheexternalprogrammingresistance betweenthe1and 2
terminals, usingtwisted, shieldedwire. Connectthe shieldtochassis ground(Gterminal)
to minimize output ripple.
(e)Turnonthepower source.
CAUTION:IFTHE REMOTEPROGRAMMINGCONNECTIONSARE OPENEDWHILETHE
SUPPLYISOPERATING,THEOUTPUTVOLTAGEWILLRISETOA LEVEL
AS HIGH Ab 70VOLTS,DEPENDINGUPONOUTPUTLOADCURRENT.IF
ASWITCHISUSEDTOSELECTRESISTORSFOR OUTPUTVOLTAGEPRO-
GRAMMING,USEONEWITHSHORTINGTYPECONTACTSTOAVOID
VOLTAGETRANSIENTSPRODUCEDBYOPENINGTHEREMOTEPROGRAM-
MINGTERMINALS.
2.2.7 Current Limiting
The maximum outputcurrentmaybelimitedtoanyvaluefromzeroto tkz maximum
outputcurrent rating ofthe supplyatanypreset outputvoltage level.
(a)Set t>.e CURRENTLIMITbarknobtothedesired outputcurrent ra-jo
0.5 A or5 A.
(b)Withloadconnectedtothe supply,turnthelarge concentricADJUST
knobfully clockwise.
(c)TurnADJUSTcontrol slowlycounterclockwise untilthe LIMITlamp
flashes,thenclockwise until flashingjust stops.Thecurrent limit operating threshold
is then approximately10%abovethe actualload current.
NOTE: If theloadcurrentisgreaterthanthatshownonthefront paneltablefora given
outputvoltage,the LIMITlampmay starttoflashwhen Hie AClinevoltage falls
to a level whichcannot supporttheincreased output.This signal indicatesAC
inputvoltage inadequacyratherthancurrent limiter circuit operation.
116 2-4

MODEL6050
TableshowingtypicalincreaseinusefuloutputwithincreasedAC
inputlinevoltage.
Output
Voltage
5
10
15
20
25
30
35
40
45
50
55
60
RatedOutput
Current(Amperes )
5
3.0
3.0
2.0
2.0
1.0
1.0
1.0
1.0
1.0
0.5
0.5
^Maximum OutputCurrent
(Amper es )
105 V A C
Line
5.5
3.8
3.8
2.5
2.25
1.45
1.3
1.3
1.2
1.2
1.2
1.1
115V A C
Line
5.5
4.2
3.8
2.8
2.4
2.0
1.4
1.3
1.3
1.3
1.3
1.25
125VA C
Line
5.5
5.2
3.8
3.6
2.5
2.4
1.75
1.45
1.4
1.4
1.4
1.4
**Increasein
Power
Output
10$
73$
26. 5 $
80$
25$
140$
75$
45$
40$
40$
180$
180$
*Withinratedpowersupplyregulationandripple specifications.
**At 125 VACinput.

6050
THEORYO FO P E R A T I O N
3-1. GENERAL
The Model6080isa voltage regulatedDCpower sourceofthe conventional series
dissipativetypeina unique configuration* whichprovides regulator efficienciesand operat-
ingfeaturesnotcommonly availableinthis regulator type.
Theconventional dissipative voltage regulator comprisesanunregulatedDC source,
avariable electronic resistance (power transistor)inserieswiththe unregulated sourceand
the load,an amplifier whichmeasuresthe differenceinvoltage betweena voltage reference
andsome fractionofthe output voltage obtained througha resistor divider acrosstheload
andamplifiesandappliesthis differencetothe series controltransistortovaryits resist-
anceinsucha directionas to maintainthe output voltage constantinthepresenceofload
currentandunregulated input voltage variations. Sincetheseries control elementisef-
fectivelyaresistance,itwilldissipate powerintheformof heat, depending uponthe voltage
acrosstheresistanceandthecurrent throughit.The output voltageoftheregulatorisad-
justedby varyingthe voltage reference,theresistor divider ratioor both.Ina wide output
range regulated supplythepower dissipatedinthe series elementincreaseswith increasing
unregulated source voltage, increasing outputcurrentandreduced output voltages.
The UNIPLY^ regulator utilizesa numberofunregulatedDCsources,anumberof
powertransistors,aseriesof diode"OR" gatesanda single control amplifier which selects
thatcombinationofunregulated sourceand series powertransistor whichbest satisfiesthe
output voltageandloadcurrent requirements, maintainingatthesametimethe minimum
available voltage difference betweenthe unregulated sourceandandthe load.By proper
selectionof unregulated sourceandseries powertransistor characteristics,itis possible
to designa regulatorwithessentially constant outputpower,i.e.asthe output voltageis
decreased,the available outputcurrentis increased.Thepowerlossesinthe regulator
remain approximately constant, independentof output voltageor current.
As a guideinunderstandingor maintenanceofthe Model 6050,this section provides
a step-by-step descriptionofeachcircuitandeach component function. Referencetothe
Schematic Diagraminthe Appendixis recommended.
3-2.ACPOWERSOURCE
AC inputpower(105to125VAC,57to440Hz)is applied througha 3-wire powercord
equippedwitha 3-blade NEMAplug.Thehotside (blackwire)oftheACflows throughfuseFl
(whichprotectsthe equipmentincaseof internal failure) throughtheAC switch SI, which turns
on thepower supply,totransformer(Tl)primary terminal115.The othersideoftheAC
inputpowergoestoterminal0oftransformerTl. Acrossterminals0 and115of transformer
Tl isaneonlamp, DSl,and series current limitingresistor,R35, whichindicatewhenthe
supplyhasbeenenergized. TransformerTl transformstheACinput voltageintothe required
secondary voltages.
*Trademarked UNIPLY® . Patents appliedfor.
1353-1