FDA801 and FDA801BFull digital audio amplifiersfor car infotainment systems

The power and the robustness of Full Digital Amplification

FDA801 and FDA801B are two new class-D audio amplifiers with a digital input designed for automotive applications. Their superb efficiency, start-stop compliance, reliable and complete diagnostics, in addition to the use of ST’s innovative feedback concept, make them the perfect amplifiers for high-performance infotainment systems.The FDA801B is the first amplifier designed for use in automotive applications able to measure both load impedance and phase and deliver the highest load detection accuracy.

KEY APPLICATIONS• Headunits

• Soundsystems

• Boosters

KEY FEATURES • Class-Defficiency,above90%

• Veryhighoutputpowercapability

• I2SorTDMdigitalinput

• 6Voperation

• Low-passoutputfilterincludedinthefeedbackloop

• I2Cflexiblediagnostics

• Fullfaultprotection

• Inputandoutputoffsetdetector

• DIM(digitalinputmeter)tocommunicatethespeakerimpedancethroughI2Cbus(Bversion)

• Verylowoutputnoise

• Linedrivermode

KEY BENEFITS • Highnoise-injectionimmunitythankstothedigitalinput

• Noneedfordigital-to-analogconverterandinputfilters

• Extremelylowpowerdissipation

• Noneedforexternalsolutionstoplaymusicduringcrankswithstart-stopengines

• Feedbackloophelpstoreduceradiatedemissions,allowingtheuseofaverylowcostandsmallsizeoutputfilterandguaranteeingaflatfrequencyresponseindependentfromtheload

• TheDIMrecognizestheloadimpedanceandallowsaveryaccuratediagnosticswithanyload

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Part number Description

FDA801 4 x 50 W class-D digital input power amplifier with I2C diagnostics

FDA801B 4 x 50 W class-D digital input power amplifier with I2C diagnostics and digital impedance meter (DIM)

FDA4100LV 4 x 135 W PWM digital input power amplifier with I2C diagnostics and step-up driver

FDA450LV 4 x 50 W PWM digital input power amplifier with built-in diagnostics features

FDA2100LV 2 x 180 W / 1 x 300 W PWM digital input power amplifier with built-in diagnostics features and step-up driver

FDA801andFDA801Barethelatesthigh-powerdigital-inputclass-Daudioamplifiers,designedforautomotiveapplications.TheyenhanceST’sclass-Daudiopoweramplifierfamilythatalreadyincludestwo4-channelamplifiers(FDA4100LVandFDA450LV)anda2-channelamplifier(FDA2100LV),thefirstproductsofthiskindonthemarket.Thankstoadigitalinput,ourfulldigitalamplifiers(FDA)savethecostofanexternalDACandcapacitors(removingtheriskofDCoffsetforleakage),areimmunetoRFnoise

injection(mobilephones)andhaveexcellentaudioperformance(SNRandDR>110dB).TheimplementationofST’sinnovativefeedbackconceptaftertheexternalfilterhelpsensureamplifierscomplywithinternationalEMIstandards,allowstheuseoflessexpensiveLCfiltersmakesdiagnosticsverypreciseandreliableandimprovestheamplifierfrequencyresponseandsoundquality,independentlyoftheload.FDA801andFDA801Bamplifiersfurtherreducethedissipatedpowerwithan

efficiencyhigherthan90%,allowingforverypreciseandreliablediagnostics.FDA801Bembedsaninnovativefeatureallowingittodirectlymeasuretheloadimpedance,thusmakingloaddiagnosticroutinesabsolutelyreliableandsimplewitheverykindofspeakerconnection.

DEVICE SUMMARY

FDA801B’S INNOVATIVE LOAD IMPEDANCE MEASUREMENT FEATURE

FDA PRODUCT FAMILY

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For more information on ST products and solutions, visit www.st.comOrder code: FLFDA8011215

FDA feedback after LC �lter FDA801B DIM

Load impedence value

I2CI2S bus

LC FILTER

FDA801B

LC FILTER

FDA801

Feed

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Feed

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Digitalinput

OHM