ncp

©SemiconductorComponentsIndustries,LLC,2011

November,2011−Rev.4

1PublicationOrderNumber:

NCP1397/D

NCP1397A,NCP1397B

HighPerformanceResonant

ModeControllerwith

IntegratedHigh-Voltage

Drivers

TheNCP1397isahighperformancecontrollerthatcanbeutilized

inhalfbridgeresonanttopologiessuchasseriesresonant,parallel

grates600Vgate

drivers,simplifyinglayoutandreducingexternalcomponentcount.

Withitsuniquearchitecture,includinga500kHzVoltageControlled

OscillatorwhosecontrolmodepermitsflexibilitywhenanORing

functionisrequired,theNCP1397deliverseverythingneededtobuild

areliableandruggedresonantmodepowersupply.

TheNCP1397providesasuiteofprotectionfeatureswith

nclude:

auto−recoveryorfaultlatch−off,brown−out,openoptocoupler,

soft−startandshort−meisalsoadjustableto

overcomeshootthroughcurrent.

Features

•High−FrequencyOperationfrom50kHzupto500kHz

•600VHigh−VoltageFloatingDriver

•AdjustableMinimumSwitchingFrequencywith±3%Accuracy

•AdjustableDeadtimefrom100nsto2ms.

•StartupSequenceViaanExternallyAdjustableSoft−Start

•Brown−OutProtectionforaSimplerPFCAssociation

•LatchedInputforSevereFaultConditions,mperatureor

OVP

•Timer−BasedInputwithAuto−RecoveryOperationforDelayed

EventReaction

•LatchedOvercurrentProtection

•DisableInputforImmediateEventReactionorSimpleON/OFF

Control

•V

CC

Operationupto20V

•LowStartupCurrentof300mA

•1A/0.5APeakCurrentSink/SourceDriveCapability

•CommonCollectorOptocouplerConnectionforEasierORing

•OptionalCommonEmitterOptocouplerConnection

•InternalTemperatureShutdown

•TheseDevicesarePb−Free,HalogenFree/BFRFreeandareRoHS

Compliant

TypicalApplications

•FlatPanelDisplayPowerConverters

•HighPowerac−dcAdaptersforNotebooks

•ComputingPowerSupplies

•IndustrialandMedicalPowerSources

•OfflineBatteryChargers

PINCONNECTIONS

MARKINGDIAGRAMS

x=AorB

A=AssemblyLocation

WL=WaferLot

Y=Year

WW=WorkWeek

G=Pb−FreePackage

SO−16,LESSPIN13

DSUFFIX

CASE751AM

1

16

1

2

3

4

5

6

7

8

16

15

14

12

11

10

9

(TopView)

BO

CSS(dis)

Fmax

Ctimer

Rt

FB

DT

Skip/Disable

Vboot

Mupper

V

CC

Mlower

Fault

HB

GND

Seedetailedorderingandshippinginformationinthepackage

dimensionssectiononpage26ofthisdatasheet.

ORDERINGINFORMATION

1

16

NCP1397xG

AWLYWW

NCP1397A,NCP1397B

2

lApplicationExample

R18

PINFUNCTIONDESCRIPTION

Pin#PinNameFunctionPinDescription

1CSS(dis)Soft−StartDischargeSoft−ttothesoft−startcapacitortoresetit

beforestartuporduringoverloadconditions.

2FmaxMaximumfrequencyclampAresistorsetsthemaximumfrequencyexcursion

3CtimerTimerdurationSetsthetimerdurationinpresenceofafault

4RtMinimumfrequencyclampConnectingaresistortothispin,setstheminimumoscillatorfrequencyreached

forV

FB

=1V.

5BOBrown−oughtaboveV

latch

(4Vtypically),it

fullylatchesoffthecontroller.

6FBFeedbackInjectingcurrentintothispinincreasestheoscillationfrequencyuptoFmax.

7DTDeadtimeAsimpleresistoradjuststhedead−timewidth

8Skip/DisableSkiporDisableinputUponrelease,acleanstartupsequenceoccursifV

FB

mode,whenFBdoesn’tdropbelow0.3V,theICrestartswithoutsoft−start

sequence.

9FaultFaultdetectioninputWhenasserted,theexternaltimerstartstocountdownandshutsdownthe

aneouslytheSoft−Startdischarge

switchisactivatedsotheconverteroperatingfrequencygoesuptoprotect

putfeaturesalsosecondfaultcomparatorwith

higherthreshold(1.5Vtypically)that:

A)Speedsupthetimercapacitorchargingcurrent8times–NCP1397A

B)latchesofftheICpermanently–NCP1397B

Inbothversionsthesecondfaultcomparatorhelpstoprotectapplicationincase

ofshortcircuitontheoutputortransformersecondarywinding.

10GNDAnalogground−

11MlowerLowsideoutputDrivesthelowersideMOSFET

12V

CC

SuppliesthecontrollerThecontrolleracceptsupto20V

13NCNotconnectedIncreasesthecreepagedistance

14HBHalf−bridgeconnectionConnectstothehalf−bridgeoutput

15MupperHighsideoutputDrivesthehighersideMOSFET

16VbootBootstrappinThefloatingV

CC

supplyfortheupperstage

NCP1397A,NCP1397B

3

alCircuitArchitecture(NCP1397A)

Vref

Rt

VDD

C

IDT

−

−

+

+

DTAdj.

I=ImaxforVfb=5.3V

I=0forVfb

Imin

VFB

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