Size (max.): 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)

See case J5 for dimensions.

Weight:

60 grams max.

Screening: Standard only. See screening table for more information.

Features

• –40°to+85°Coperation

• 18to36VDCinput(19to36VDCinput

HR301-2805)

• 50Vfor50mstransientprotection

• Fullyisolated

• Fixedfrequencyswitching

• RemotesenseonHR301-2805model

• Inhibitfunction

• Indefiniteshortcircuitprotection

• Upto86%efficiency

description

HR300Series™DC/DCconverterscombinethesmallsizeandhigh

reliabilityofhybrid-basedcomponents,thehighefficiencyofswitching

regulators,andtheisolation,regulation,andlownoisecharacteristics

oflinearregulators.

HR300 DC/DC converters use thick-film hybrid manufacturing tech-

niques for smaller size, lighter weight and higher reliability than

converters produced with other circuit techniques. With a footprint

of less than 3.7 square inches and a 0.5 inch height, the HR300

convertersreachpowerdensitiesupto22wattspercubicinch.

TheHR300partsusethesamemanufacturingproceduresandquality

controlsthatInterpointappliestoconvertersbuiltforaerospaceand

militaryapplications.Theconvertersarehermeticallysealedinmetal

atm-cc/sec.

HR300convertersuseaconstantfrequencypulse-widthmodulated

switchingregulatordesignoperatingintheforwardmodewithaclock

switchingfrequencyof240to300kHz.Isolationisachievedthrough

theuseofatransformerintheforwardpowercircuitandanoptocou-

plerinthefeedbackcontrolloop.Thefullloadoutputpowerof30watts

isavailableovertheentire18to36VDCinputrange(19to36HR301-

2805).Ondualoutputmodels,upto90%offullpowerisavailablefrom

eitheroutputuptoacombinedtotalof30watts.

TheHR300’shighefficiencyismaintainedovertheentireinputvoltage

rangeandfromapproximately25%offullloadtofullload(seetypical

efficiencycurves).

Shortcircuitprotectionisprovidedthroughfoldbackcurrentlimiting.

Whentheoutputcurrentreachesapproximately125%ofthefullrated

load, the output voltage begins to reduce to protect the converter.

The converter can sustain a true short circuit condition indefinitely.

The HR300’s flanged case facilitates removal of heat and provides

formechanicallysecuremounting.Iffullpoweroperationorindefinite

shortcircuitprotectionisasystemrequirement,theHR300converter

should be mounted with an efficient heat sink in contact with the

mountingflange.

Internal filters in all HR300 converters provide low noise

on both the input and outputs. On HR301 models, two-section

L-Cfilterslimitoutputripplevoltageandreflectedinputripplecurrent.

OnHR302models,single-sectionL-Cfiltersperformthesamefunc-

tion.

For maximum output regulation, the HR301-2805 is provided with

external output voltage remote sense pins. Connecting the remote

sensepinstotheloadprovidesafour-terminalvoltagemodewhich

eliminates the adverse effects of line resistance voltage drops.

Remote sense pins may be left unconnected, but see cautions in

thisdatasheet.Fornormaloperation,remotesensepinsshouldbe

connectedtotherespectiveoutputpins.

Aninhibitisprovidedtoallowalogicinputtoshutdowntheconverter.

Anopencircuitontheinhibitpin(pin2or8)allowsnormaloperation.

Aconnectionbetweentheinhibitpinandtheinputcommon(pin10)

disablestheinternaloscillator,shuttingdowntheoutput.Theinhibitpin

hasanopencircuitvoltageof11to16Vonsingleoutputmodels,8

to12VonHR302-2812and10to14VonHR302-2815.Intheinhibit

mode,approximately1mAmustbesunkfromtheinhibitpin.Anactive

lowopencollectorisrequiredtoactivatetheinhibitfunction.

mODeLS

Single

5

12

15

dual

±12

±15

HR300

SeRIeS

30 Watt

NOT RECOMMENDED FOR NEW DESIGNS

Page 1 of 6

HR300RevD-20100212

CraneAerospace&electronics

electronicsGroup(InterpointBrand)

POBox97005•RedmondWA98073-9705

425.882.3100•power@crane-eg.com

www.interpoint.com