TDA7377H. 2x30W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO. HIGH OUTPUT POWER CAPABILITY: 2x35W max./4ω. 4 x 1KHz, 10%

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1 TDA7377 2x30W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO HIGH OUTPUT POWER CAPABILITY: 2x35W max./4ω 2x30W/4Ω EIAJ 2x30W/4Ω EIAJ 2 x 1KHz, 10% 4 x 10% 4 x 1KHz, 10% MINIMUM EXTERNAL COMPONENTS COUNT: NO BOOTSTRAP CAPACITORS NO BOUCHEROT CELLS INTERNALLY FIXED GAIN (26 BTL) ST-BY FUNCTION (CMOS COMPATIBLE) NOAUDIBLE POPDURING ST-BYOPERATIONS DIAGNOSTICS FACILITY FOR: CLIPPING OUT TO GND SHORT OUT TO VS SHORT SOFT SHORT AT TURN-ON THERMAL SHUTDOWN PROXIMITY Proecions: OUPUT AC/DC SHORT CIRCUIT BLOCK DIAGRAM MULTIWATT15V MULTIWATT15H ORDERING NUMBERS: TDA7377V TDA7377H TOGND TOVS ACROSS THE LOAD SOFT SHORT AT TURN-ON OVERRATING CHIP TEMPERATURE WITH SOFT THERMAL LIMITER LOAD DUMP VOLTAGE SURGE VERY INDUCTIVE LOADS FORTUITOUS OPEN GND REVERSED BATTERY ESD DIAGNOSTICS Sepember /10

2 ABSOLUTE MAXIMUM RATINGS DESCRIPTION The TDA7377 is a new echnology class AB car radio amplifier able o work eiher in DUAL BRIDGE or QUAD SINGLE ENDED configuraion. The exclusive fully complemenary srucure of he oupu sage and he inernally fixed gain guaranees he highes possible power performances wih exremely reduced componen coun. The on-board clip deecor simplifies gain compression operaion. The faul diagnosics makes i possible o deec misakes during car radio se assembly and wiring in he car. GENERAL STRUCTURE Symbol Parameer Value Uni V op Operaing Supply Volage 18 V V S DC Supply Volage 28 V V peak Peak Supply Volage (for = 50ms) 50 V I O Oupu Peak Curren (no repeiive = 100µs) 4.5 A I O Oupu Peak Curren (repeiive f > 10Hz) 3.5 A P o Power Dissipaion (T case =85 C) 36 W T sg,t j Sorage and Juncion Temperaure -40 o 150 C THERMAL DATA Symbol Descripion Value Uni R h j-case Thermal Resisance Juncion-case Max 1.8 C/W PIN CONNECTION (Top view) DIAGNOSTICS 2/10

3 ELECTRICAL CHARACTERISTICS (Refer o he es circui, VS = 14.4V; RL = 4Ω; f = 1KHz; Tamb = 25 C, unless oherwise specified Symbol Parameer Tes Condiion Min. Typ. Max. Uni V S Supply Volage Range 8 18 V Id Toal Quiescen Drain Curren RL = 150 ma V OS Oupu Offse Volage 150 mv P O Oupu Power THD = 10%; R L =4Ω Bridge Single Ended Single Ended, R L =2Ω P Omax Max. Oupu Power (***) VS = 14.4V, Bridge W P O EIAJ EIAJ Oupu Power (***) V S = 13.7V, Bridge W THD Disorion R L =4Ω Single Ended, P O = 0.1 o 4W Bridge, P O = 0.1 o 10W CT Cross Talk f = 1KHz Single Ended f = 10KHz Single Ended f = 1KHz Bridge f = 10KHz Bridge R IN Inpu Impedance Single Ended Bridge GV Volage Gain Single Ended Bridge G V Volage Gain Mach 0.5 E IN Inpu Noise Volage R g = 0; A weighed, S.E. Non Invering Channels Invering Channels Bridge Rg = 0; 22Hz o 22KHz 3.5 µv SVR Supply Volage Rejecion Rg = 0; f = 300Hz 50 A SB Sand-by Aenuaion P O =1W I SB ST-BY Curren Consumpion V ST-BY = 0 o 1.5V 100 µa V SB ST-BY In Threshold Volage 1.5 V V SB ST-BY Ou Threshold Volage 3.5 V I pin7 ST-BY Pin Curren Play Mode V pin7 =5V 50 µa Max Driving Curren Under 5 ma Faul (*) I cd off Clipping Deecor d = 1% (**) 90 µa Oupu Average Curren Icd on Clipping Deecor d = 5% (**) 160 µa Oupu Average Curren V sa pin10 Volage Sauraion on pin 10 Sink Curren a Pin 10 = 1mA 0.7 V (*) See buil-in S/C proecion descripion (**) Pin 10 Pulled-up o 5V wih 10KΩ; RL =4Ω (***) Sauraed square wave oupu W W W % % KΩ KΩ µv µv 3/10

4 STANDARD TEST AND APPLICATION CIRCUIT Figure 1: Quad Sereo ST-BY 10K R1 C7 10µF C6 100nF V S C5 1000µF IN FL C1 0.22µF IN FR 5 IN RL C2 0.22µF C4 0.22µF C µF IN RR 11 C µF Noe: C3 0.22µF C9, C10, C11, C12 could be 14 6 reduced if he 2Ω operaion is no C µF required. C8 47µF DIAGNOSTICS D94AU063A C9 2200µF OUT FL OUT FR OUT RL OUT RR Figure 2: Double Bridge ST-BY 10K R1 C5 10µF C4 100nF V S C3 1000µF IN L C1 0.47µF 5 OUT L IN R C2 0.47µF OUT R C8 47µF DIAGNOSTICS D94AU064A Figure 3: Sereo/Bridge ST-BY 10K 10µF 100nF VS 1000µF IN L IN L 0.22µF 0.22µF 0.47µF 4 7 IN BRIDGE 12 47µF DIAGNOSTICS 2200µF 2200µF D94AU065A OUT L OUT R OUT BRIDGE 4/10

5 High Applicaion Flexibiliy The availabiliy of 4 independen channels makes i possible o accomplish several kinds of applicaions ranging from 4 speakers sereo (F/R) o 2 speakers bridge soluions. In case of working in single ended condiions he polariy of he speakers driven by he invering amplifier mus be reversed respec o hose driven by non invering channels. This is o avoid phase inconveniences causing sound aleraions especially during he reproducion of low frequencies. Easy Single Ended o Bridge Transiion The change from single ended o bridge configuraions is made simply by means of a shor circui across he inpus, ha is no need of furher exernal componens. Gain Inernally Fixed o 20 in Single Ended, 26 in Bridge Advanages of his design choice are in erms of: componens and space saving oupu noise, supply volage rejecion and disorion opimizaion. Silen Turn On/Off and Muing/Sand-by Funcion The sand-by can be easily acivaed by means of a CMOS level applied o pin 7 hrough a RC filer. Under sand-by condiion he device is urned off compleely (supply curren = 1µA yp.; oupu aenuaion= 80 min.). Every ON/OFF operaion is virually pop free. Furhemore, a urn-on he device says in muing condiion for a ime deermined by he value assigned o he SVR capacior. While in muing he device oupus becomes insensiive o any kinds of signal ha may be presen a he inpu erminals. In oher words every ransien coming from previous sages produces no unplesan acousic effec o he speakers. STAND-BY DRIVING (pin 7) Some precauions have o be aken in he definiion of sand-by driving neworks: pin 7 canno be direcly driven by a volage source whose curren capabiliy is higher han 5mA. In pracical cases a series resisance has always o be insered, having i he double purpose of limiing he curren a pin 7 and o smooh down he sand-by ON/OFF ransiions - in combinaion wih a capacior - for oupu pop prevenion. In any case, a capacior of a leas 100nF from pin 7 o S-GND, wih no resisance in beween, is necessary o ensure correc urn-on. OUTPUT STAGE The fully complemenary oupu sage was made possible by he developmen of a new componen: he ST exclusive power ICV PNP. A novel design based upon he connecion shown in fig. 20 has hen allowed he full exploiaion of is possibiliies. The clear advanages his new approach has over classical oupu sages are as follows: Rail-o-Rail Oupu Volage Swing Wih No Need of Boosrap Capaciors. The oupu swing is limied only by he VCEsa of he oupu ransisors, which is in he range of 0.3Ω (R sa ) each. Classical soluions adoping composie PNP- NPN for he upper oupu sage have higher sauraion loss on he op side of he waveform. This unbalanced sauraion causes a significan power reducion. The only way o recover power consiss of he addiion of expensive boosrap capaciors. Absolue Sabiliy Wihou Any Exernal Compensaion. Referring o he circui of fig. 20 he gain VOu/VIn is greaer han uniy, approximaely 1+ R2/R1. The DC oupu (VCC/2) is fixed by an auxiliary amplifier common o all he channels. By conrolling he amoun of his local feedback i is possible o force he loop gain (A*β) oless han uniy a frequency for which he phase shif is 180. This means ha he oupu buffer is inrinsically sable and no prone o oscillaion. Mos remarkably, he above feaure has been achieved in spie of he very low closed loop gain of he amplifier. In conras, wih he classical PNP-NPN sage, he soluion adoped for reducing he gain a high frequencies makes use of exernal RC neworks, namely he Bouchero cells. BUILT IN SHORT CIRCUIT PROTECTION Figure 20: The New Oupu Sage 5/10

6 Reliable and safe operaion, in presence of all kinds of shor circui involving he oupus is assured by BUILT-IN proecors. Addiionally o he AC/DC shor circui o GND, o VS, across he speaker, a SOFT SHORT condiion is signalled ou during he TURN-ON PHASE so assuring correc operaion for he device iself and for he loudspeaker. This paricular kind of proecion acs in a way o avoid ha he device is urned on (by ST-BY) when a resisive pah (less han 16 ohms) is presen beween he oupu and GND. As he involved circuiry is normally disabled when a curren higher han 5mA is flowing ino he ST-BY pin, i is imporan, in order no o disable i, o have he exernal curren source driving he ST- BY pin limied o 5mA. This exra funcion becomes paricularly aracive when, in he single ended configuraion, one capacior is shared beween wo oupus (see fig. 21). Figure 22: Clipping Deecion Waveforms Figure 21. A curren sinking a pin 10 is riggered when a cerain disorion level is reached a any of he oupus. This funcion allows gain compression possibiliy whenever he amplifier is overdriven. Supposing ha he oupu capacior Cou for any reason is shored, he loudspeaker will no be damaged being his sof shor circui condiion revealed. Diagnosics Faciliy The TDA7377 is equipped wih a diagnosic circuiry able o deec he following evens: Clipping in he oupu signal Thermal shudown Oupu faul: shor o GND shor o VS sof shor a urn on The informaion is available across an open collecor oupu (pin 10) hrough a curren sinking when he even is deeced Thermal Shudown In his case he oupu 10 will signal he proximiy of he juncion emperaure o he shudown hreshold. Typically curren sinking a pin 10 will sar ~10 C before he shudown hreshold is reached. HANDLING OF THE DIAGNOSTICS INFORMA- Figure 23: Oupu Faul Waveforms (see fig. 24) TDA7377 6/10

7 Figure 24: Faul Waveforms ST-BY PIN VOLTAGE 2V OUT TO Vs SHORT OUTPUT WAVEFORM SOFT SHORT OUT TO GND SHORT Vpin 10 CORRECT TURN-ON FAULT DETECTION CHECK AT TURN-ON (TEST PHASE) D94AU149A SHORT TO GND OR TO Vs TION As various kinds of informaion is available a he same pin (clipping deecion, oupu faul, hermal proximiy), his signal mus be handled properly in order o discriminae each even. This could be done by aking ino accoun he differen iming of he diagnosic oupu during each case. Figure 25: Waveforms ST-BY PIN VOLTAGE Vs OUTPUT WAVEFORM Vpin 10 WAVEFORM D94AU150 CLIPPING SHORT TO GND OR TO Vs THERMAL PROXIMITY 7/10

8 Normally he clip deecor signalling produces a low level a pin 10 ha is shorer han ha presen under fauly condiions; based on his assumpion Figure 26. an inerface circuiry o differeniae he informaion is represened in he schemaic of fig. 26. TDA7377 PCB-LAYOUT GROUNDING (general rules) The device has 2 disinc ground leads, P-GND (POWER GROUND) and S-GND (SIGNAL GROUND) which are pracically disconneced from each oher a chip level. Proper operaion requires ha P-GND and S-GND leads be conneced ogeher on he PCB-layou by means of reasonably low-resisance racks. As for he PCB-ground configuraion, a sar-like arrangemen whose cener is represened by he supply-filering elecrolyic capacior ground is highly advisable. In such conex, a leas 2 separae pahs have o be provided, one for P-GND and one for S-GND. The correc ground assignmens are as follows: STANDBY CAPACITOR, pin 7 (or any oher sandby driving neworks): on S-GND SVR CAPACITOR (pin 6): on S-GND and o be placed as close as possible o he device. INPUT SIGNAL GROUND (from acive/passive signal processor sages): on S-GND. SUPPLY FILTERING CAPACITORS (pins 3,13): on P-GND. The (-) erminal of he elecrolyic capacior has o be direcly ied o he baery (-) line and his should represen he saring poin for all he ground pahs. 8/10

9 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B C D E F G G H H L L L L L L M M S S Dia OUTLINE AND MECHANICAL DATA Muliwa15 V 9/10

10 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B C E F G G H H L L L L L L L L S S Dia OUTLINE AND MECHANICAL DATA Muliwa15 H 10/10