LM3886 Overture Audio Pwr Amp Series High-Perf 68W Audio Pwr Amp w/Mute

31 Pages·2013·1.15 MB·English

LM3886
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LM3886 Overture™ Audio Power Amplifier Series
High-Performance 68W Audio Power Amplifier w/Mute
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FEATURES DESCRIPTION
1
• 68WCont.Avg.OutputPowerinto4ΩatV = The LM3886 is a high-performance audio power
23 CC amplifier capable of delivering 68W of continuous
±28V
average power to a 4Ω load and 38W into 8Ω with
• 38WCont.Avg.OutputPowerinto8ΩatV =
CC 0.1% THD+Nfrom20Hz–20kHz.
±28V
The performance of the LM3886, utilizing its Self
• 50WCont.Avg.OutputPowerinto8ΩatV =
CC Peak Instantaneous Temperature (°Ke) (SPiKe)
±35V
protection circuitry, puts it in a class above discrete
• 135WInstantaneousPeakOutputPower and hybrid amplifiers by providing an inherently,
Capability dynamically protected Safe Operating Area (SOA).
SPiKe protection means that these parts are
• Signal-to-Noise Ratio≥ 92dB
completely safeguarded at the output against
• AnInputMuteFunction
overvoltage, undervoltage, overloads,including shorts
• Output ProtectionfromaShorttoGroundor to the supplies, thermal runaway, and instantaneous
totheSuppliesviaInternalCurrentLimiting temperaturepeaks.
Circuitry
The LM3886 maintains an excellent signal-to-noise
• Output Over-VoltageProtectionagainst ratio of greater than 92dB with a typical low noise
TransientsfromInductiveLoads floor of 2.0µV. It exhibits extremely low THD+N
• SupplyUnder-VoltageProtection,notAllowing values of 0.03% at the rated output into the rated
load over the audio spectrum, and provides excellent
InternalBiasingtoOccur when|V |+|V |≤
EE CC linearity with an IMD (SMPTE) typical rating of
12V,thusEliminatingTurn-Onand Turn-Off
0.004%.
Transients
• 11-LeadTO-220Package
• WideSupply Range20V-94V
APPLICATIONS
• Componentstereo
• Compactstereo
• Self-poweredspeakers
• Surround-soundamplifiers
• High-endstereo TVs
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
Overtureisatrademarkofdcl_owner.
2
Allothertrademarksarethepropertyoftheirrespectiveowners.
3
PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©1999–2013,TexasInstrumentsIncorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarilyincludetestingofallparameters.
LM3886
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Typical Application
*Optionalcomponentsdependentuponspecificdesignrequirements.RefertoExternalComponentsDescriptionfora
componentfunctionaldescription.
Figure1. TypicalAudioAmplifierApplicationCircuit
Connection Diagram
TopView
Preliminary:callyourlocalTexasInstrumentsSalesRep.ordistributorforavailability
Figure2. TO-220andPFM PlasticPackages
SeePackageNumberNDJ0011Bfor StaggeredLeadNon-IsolatedPackageorNDA0011BforStaggered
LeadIsolatedPackage(1)
(1) TheLM3886TpackageTA11Bisanon-isolatedpackage,settingthetabofthedeviceandtheheatsinkatV−potentialwhenthe
LM3886isdirectlymountedtotheheatsinkusingonlythermalcompound.Ifamicawasherisusedinadditiontothermalcompound,
θ (casetosink)isincreased,buttheheatsinkwillbeisolatedfromV−.
CS
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Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam
duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
Absolute Maximum Ratings (1)(2)(3)
SupplyVoltage|V+|+|V−| (NoSignal) 94V
SupplyVoltage|V+|+|V−| (InputSignal) 84V
CommonModeInputVoltage (V+orV−)and
|V+|+|V−|≤80V
DifferentialInputVoltage (4) 60V
OutputCurrent InternallyLimited
PowerDissipation (5) 125W
ESDSusceptibility (6) 3000V
JunctionTemperature (7) 150°C
SolderingInformation TPackage(10seconds) 260°C
StorageTemperature −40°Cto+150°C
ThermalResistance θ 1°C/W
JC
θ 43°C/W
JA
(1) AllvoltagesaremeasuredwithrespecttotheGNDpin(pin7),unlessotherwisespecified.
(2) AbsoluteMaximumRatings indicatelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatings indicateconditionsfor
whichthedeviceisfunctional.ElectricalCharacteristicsstateDCandACelectricalspecificationsunderparticulartestconditionsand
specificperformancelimits.ThisassumesthatthedeviceiswithintheOperatingRatings.Thetypicalvalueisagoodindicationof
deviceperformance.
(3) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexasInstrumentsSalesOffice/Distributorsforavailabilityand
specifications.
(4) TheDifferentialInputVoltageAbsoluteMaximumRatingisbasedonsupplyvoltagesofV+=+40VandV−=−40V.
(5) Foroperatingatcasetemperaturesabove25°C,thedevicemustbederatedbasedona150°Cmaximumjunctiontemperatureanda
thermalresistanceofθ =1.0°C/W(junctiontocase).RefertoFigure50inApplicationInformationunderTHERMAL
JC
CONSIDERATIONS.
(6) Humanbodymodel,100pFdischargedthrougha1.5kΩresistor.
(7) Theoperatingjunctiontemperaturemaximumis150°C,however,theinstantaneousSafeOperatingAreatemperatureis250°C.
Operating Ratings (1)(2)(3)
TemperatureRange
T ≤T ≤T −20°C≤T ≤+85°C
MIN A MAX A
SupplyVoltage|V+|+|V−| 20Vto84V
(1) AllvoltagesaremeasuredwithrespecttotheGNDpin(pin7),unlessotherwisespecified.
(2) AbsoluteMaximumRatings indicatelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatings indicateconditionsfor
whichthedeviceisfunctional.ElectricalCharacteristicsstateDCandACelectricalspecificationsunderparticulartestconditionsand
specificperformancelimits.ThisassumesthatthedeviceiswithintheOperatingRatings.Thetypicalvalueisagoodindicationof
deviceperformance.
(3) Operationisspecifiedupto84V,however,distortionmaybeintroducedfromSPIKeProtectionCircuitryifproperthermalconsiderations
arenottakenintoaccount.RefertoTHERMALCONSIDERATIONSformoreinformation.(SeeFigure5)
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Electrical Characteristics (1)(2)
ThefollowingspecificationsapplyforV+=+28V,V−=−28V,I =−0.5mAwithR =4Ωunlessotherwisespecified.Limits
MUTE L
applyforT =25°C.
A
LM3886 Units
Parameter TestConditions
Typical (3) Limit (4) (Limits)
|V+|+|V−| PowerSupplyVoltage (5) V −V−≥9V 20 V(min)
pin7 18
84 V(max)
A MuteAttenuation Pin8Openorat0V,Mute:On
M
CurrentoutofPin8>0.5mA, 115 80 dB(min)
Mute:Off
P (6) OutputPower(ContinuousAverage) THD+N=0.1%(max)
O
f=1kHz;f=20kHz
|V+|=|V−|=28V,R =4Ω 68 60 W(min)
L
|V+|=|V−|=28V,R =8Ω 38 30 W(min)
L
|V+|=|V−|=35V,R =8Ω 50 W
L
PeakP InstantaneousPeakOutputPower 135 W
O
THD+N TotalHarmonicDistortionPlusNoise 60W,R =4Ω, %
L
30W,R =8Ω, 0.03 %
L
20Hz≤f≤20kHz 0.03
A =26dB
V
SR (6) SlewRate (7) V =2.0Vp-p,t =2ns 19 8 V/μs(min)
IN RISE
I+(6) TotalQuiescentPowerSupplyCurrent V =0V,V =0V,I =0A 50 85 mA(max)
CM o o
V (8) InputOffsetVoltage V =0V,I =0mA 1 10 mV(max)
OS CM o
I InputBiasCurrent V =0V,I =0mA 0.2 1 μA(max)
B CM o
I InputOffsetCurrent V =0V,I =0mA 0.01 0.2 μA(max)
OS CM o
I OutputCurrentLimit |V+|=|V−|=20V,t =10ms,V =0V 11.5 7 A(min)
o ON O
V (8) OutputDropoutVoltage (9) |V+–V |,V+=28V,I =+100mA 1.6 2.0 V(max)
od O o
|V –V−|,V−=−28V,I =−100mA 2.5 3.0 V(max)
O o
PSRR (8) PowerSupplyRejectionRatio V+=40Vto20V,V−=−40V, 120 85 dB(min)
V =0V,I =0mA
CM o
V+=40V,V−=−40Vto−20V, 105 85 dB(min)
V =0V,I =0mA
CM o
CMRR (8) CommonModeRejectionRatio V+=60Vto20V,V−=−20Vto−60V,
110 85 dB(min)
V =20Vto−20V,I =0mA
CM o
A (8) OpenLoopVoltageGain |V+|=|V−|=28V,R =2kΩ,ΔV =40V 115 90 dB(min)
VOL L O
GBWP Gain-BandwidthProduct |V+|=|V−|=30V
8 2 MHz(min)
f =100kHz,V =50mVrms
O IN
e (6) InputNoise IHF—AWeightingFilter
IN 2.0 10 μV(max)
R =600Ω(InputReferred)
IN
SNR Signal-to-NoiseRatio P =1W,A-Weighted,
O 92.5 dB
Measuredat1kHz,R =25Ω
S
P =60W,A-Weighted,
O 110 dB
Measuredat1kHz,R =25Ω
S
IMD IntermodulationDistortionTest 60Hz,7kHz,4:1(SMPTE) 0.004
%
60Hz,7kHz,1:1(SMPTE) 0.009
(1) AllvoltagesaremeasuredwithrespecttotheGNDpin(pin7),unlessotherwisespecified.
(2) AbsoluteMaximumRatings indicatelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatings indicateconditionsfor
whichthedeviceisfunctional.ElectricalCharacteristicsstateDCandACelectricalspecificationsunderparticulartestconditionsand
specificperformancelimits.ThisassumesthatthedeviceiswithintheOperatingRatings.Thetypicalvalueisagoodindicationof
deviceperformance.
(3) Typicalsaremeasuredat25°Candrepresenttheparametricnorm.
(4) LimitsarespeficiedtoAOQL(AverageOutgoingQualityLevel).
(5) V−musthaveatleast−9Vatitspinwithreferencetogroundinorderfortheunder-voltageprotectioncircuitrytobedisabled.
(6) ACElectricalTest;refertoTestCircuit#2-ACElectricalTestCircuit.
(7) Thefeedbackcompensationnetworklimitsthebandwidthoftheclosed-loopresponseandsotheslewratewillbereducedduetothe
highfrequencyroll-off.Withoutfeedbackcompensation,theslewrateistypicallylarger.
(8) DCElectricalTest;refertoTestCircuit#1-DCElectricalTestCircuit.
(9) Theoutputdropoutvoltageisthesupplyvoltageminustheclippingvoltage.RefertoFigure14inTypicalPerformanceCharacteristics.
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Test Circuit #1- DC Electrical Test Circuit
Test Circuit #2 -AC Electrical Test Circuit
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Single Supply Application Circuit
*Optionalcomponentsdependentuponspecificdesignrequirements.RefertotheExternalComponentsDescription
foracomponentfunctionaldescription.
Figure3. TypicalSingleSupplyAudioAmplifierApplicationCircuit
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Equivalent Schematic
(excludingactiveprotectioncircuitry)
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(excludingactiveprotectioncircuitry)
External Components Description
(SeeFigure1andFigure3)
Components FunctionalDescription
1. R Actsasavolumecontrolbysettingthevoltagelevelallowedtotheamplifier'sinputterminals.
IN
2. R ProvidesDCvoltagebiasingforthesinglesupplyoperationandbiascurrentforthepositiveinputterminal.
A
3. C Providesbiasfiltering.
A
4. C ProvidesACcouplingattheinputandoutputoftheamplifierforsinglesupplyoperation.
5. R Preventscurrentsfromenteringtheamplifier'snon-invertinginputwhichmaybepassedthroughtotheloaduponpower-
B
downofthesystemduetothelowinputimpedanceofthecircuitrywhentheunder-voltagecircuitryisoff.This
phenomenonoccurswhenthesupplyvoltagesarebelow1.5V.
6. C (1) Reducesthegain(bandwidthoftheamplifier)athighfrequenciestoavoidquasi-saturationoscillationsoftheoutput
C
transistor.Thecapacitoralsosuppressesexternalelectromagneticswitchingnoisecreatedfromfluorescentlamps.
7. Ri InvertinginputresistancetoprovideACGaininconjunctionwithR .
f1
8. Ci (1) Feedbackcapacitor.EnsuresunitygainatDC.Alsoalowfrequencypole(highpassroll-off)at:
f =1/(2πRiCi)
c
9. R FeedbackresistancetoprovideACGaininconjunctionwithRi.
f1
10. R (1) AthigherfrequenciesfeedbackresistanceworkswithC toprovidelowerACGaininconjunctionwithR andRi.Ahigh
f2 f f1
frequencypole(lowpassroll-off)existsat:
f =[R R (s+1/R C)]/[(R +R )(s+1/C(R +R ))]
c f1 f2 f2 f f1 f2 f f1 f2
11. C(1) CompensationcapacitorthatworkswithR andR toreducetheACGainathigherfrequencies.
f f1 f2
12. R Muteresistancesetuptoallow0.5mAtobedrawnfrompin8toturnthemutingfunctionoff.
M
→R iscalculatedusing:R ≤(|V |−2.6V)/I8whereI8≥0.5mA.RefertotheFigure44andFigure45inTypical
M M EE
PerformanceCharacteristics.
13. C Mutecapacitancesetuptocreatealargetimeconstantforturn-onandturn-offmuting.
M
14. R (1) WorkswithC tostabilizetheoutputstagebycreatingapolethateliminateshighfrequencyoscillations.
SN SN
15. C (1) WorkswithR tostabilizetheoutputstagebycreatingapolethateliminateshighfrequencyoscillations.
SN SN
f =1/(2πR C )
c SN SN
16. L (1) ProvideshighimpedanceathighfrequenciessothatRmaydecoupleahighlycapacitiveloadandreducetheQofthe
17. R (1) seriesresonantcircuitduetocapacitiveload.AlsoprovidesalowimpedanceatlowfrequenciestoshortoutRandpass
audiosignalstotheload.
18. C Providespowersupplyfilteringandbypassing.
S
19. S1 Muteswitchthatmutesthemusicgoingintotheamplifierwhenopened.
(1) Optionalcomponentsdependentuponspecificdesignrequirements.RefertoApplicationInformationformoreinformation.
OPTIONALEXTERNALCOMPONENTINTERACTION
Although the optional external components have specific desired functions that are designed to reduce the
bandwidth and eliminate unwanted high frequency oscillations they may cause certain undesirable effects when
theyinteract.Interactionmayoccurforcomponentswhosereactancesareincloseproximitytooneanother.One
examplewouldbethecouplingcapacitor,C ,andthecompensationcapacitor, C.Thesetwocomponentsact as
C f
low impedances to certain frequencies which will couple signals from the input to the output. Please take careful
noteofbasicamplifiercomponentfunctionalitywhendesigninginthesecomponents.
The optional external components shown in Figure 3 and described above are applicable in both single and split
voltagesupplyconfigurations.
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Typical Performance Characteristics
SPiKe
SafeArea ProtectionResponse
Figure4. Figure5.
SupplyCurrentvs
SupplyVoltage PulseThermalResistance
Figure6. Figure7.
SupplyCurrentvs
PulseThermalResistance OutputVoltage
Figure8. Figure9.
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Typical Performance Characteristics (continued)
PulsePowerLimit PulsePowerLimit
Figure10. Figure11.
SupplyCurrentvs InputBiasCurrentvs
CaseTemperature CaseTemperature
Figure12. Figure13.
ClippingVoltagevs ClippingVoltagevs
SupplyVoltage SupplyVoltage
Figure14. Figure15.
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