TDA7377H ,2 x 30WDUAL/QUAD POWER AMPLIFIER FOR CAR RADIOTDA73772x30W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIOHIGH OUTPUT POWER CAPABILITY:2x 35W max./4Ω2x3 ..
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TDA7377H
2 x 30WDUAL/QUAD POWER AMPLIFIER FOR CAR RADIO
TDA7377 30W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO
HIGH OUTPUT POWER CAPABILITY: 35W max./4Ω 30W/4Ω EIAJ 30W/4Ω EIAJx 20W/4Ω @14.4V, 1KHz, 10%x 6W/4Ω @14.4V,1KHz, 10%x 10W/2Ω @14.4V, 1KHz, 10%
MINIMUM EXTERNAL COMPONENTS
COUNT: NO BOOTSTRAP CAPACITORS NO BOUCHEROT CELLS INTERNALLY FIXED GAIN (26dB BTL)
ST-BY FUNCTION (CMOS COMPATIBLE)
NOAUDIBLEPOPDURINGST-BYOPERATIONS
DIAGNOSTICSFACILITY FOR: CLIPPING OUTTO GND SHORT OUTTOVS SHORT SOFT SHORT AT TURN-ON THERMAL SHUTDOWN PROXIMITY
Protections:OUPUT AC/DC SHORT CIRCUIT
–TO GND
–TOVS ACROSS THE LOAD
SOFT SHORT AT TURN-ON
OVERRATING CHIP TEMPERATURE WITH
SOFT THERMAL LIMITER
LOAD DUMP VOLTAGE SURGE
VERYINDUCTIVE LOADS
FORTUITOUS OPEN GND
REVERSED BATTERY
ESD
September 1998
BLOCK DIAGRAM
MULTIWATT15V MULTIWATT15H
ORDERING NUMBERS:TDA7377V TDA7377H
DIAGNOSTICS
1/10
DESCRIPTIONThe TDA7377isa new technology class AB car
radio amplifier able to work either in DUAL
BRIDGEor QUAD SINGLEENDED configuration.
The exclusive fully complementary structureof the
output stage and the internally fixed gain guaran-
tees the highest possible power performances
with extremely reduced component count. The
on-board clip detectorsimplifies gain compression
operation. The fault diagnostics makesit possible detect mistakes during car radio set assembly
and wiringin the car.
GENERAL STRUCTURE
ABSOLUTEMAXIMUM RATINGS
Symbol Parameter Value UnitVop Operating Supply Voltage 18 V DC Supply Voltage 28 V
Vpeak Peak Supply Voltage(fort= 50ms) 50 V Output Peak Current (not repetitivet= 100µs) 4.5 A Output Peak Current (repetitivef> 10Hz) 3.5 A
Ptot Power Dissipation (Tcase =85°C) 36 W
Tstg,Tj Storage and Junction Temperature -40to 150 °C
THERMAL DATA
Symbol Description Value UnitRth j-case Thermal Resistance Junction-case Max 1.8 °C/W
PIN CONNECTION (Topview)
DIAGNOSTICS
TDA73772/10
ELECTRICAL CHARACTERISTICS (Referto the test circuit,VS= 14.4V;RL =4Ω;f= 1KHz;
Tamb =25°C,unlessotherwise specified
Symbol Parameter Test Condition Min. Typ. Max. Unit Supply Voltage Range 8 18 V Total Quiescent Drain Current RL=∞ 150 mA
VOS Output Offset Voltage 150 mV Output Power THD= 10%;RL =4Ω
Bridge
Single Ended
Single Ended,RL =2Ω
POmax Max. Output Power (***) VS= 14.4V, Bridge 31 35 W EIAJ EIAJ Output Power (***) VS= 13.7V, Bridge 27 30 W
THD Distortion RL =4Ω
Single Ended,PO= 0.1to 4W
Bridge,PO=0.1to 10W
0.03 0.3 Cross Talk f= 1KHz Single Ended= 10KHz Single Ended= 1KHz Bridge= 10KHz Bridge
RIN Input Impedance Single Ended
Bridge Voltage Gain Single Ended
Bridge Voltage Gain Match 0.5 dB
EIN Input Noise Voltage Rg=0;”A” weighted, S.E.
Non Inverting Channels
Inverting Channels
Bridge= 0;22Hzto 22KHz 3.5 µV
SVR Supply Voltage Rejection Rg=0;f= 300Hz 50 dB
ASB Stand-by Attenuation PO =1W 80 90 dB
ISB ST-BY Current Consumption VST-BY=0to 1.5V 100 µA
VSB ST-BYIn Threshold Voltage 1.5 V
VSB ST-BY Out Threshold Voltage 3.5 V
Ipin7 ST-BY Pin Current Play ModeVpin7 =5V 50 µA
Max Driving Current Under
Fault(*)
5mA
Icdoff Clipping Detector
Output Average Current= 1% (**) 90 µA
Icdon Clipping Detector
Output Average Current= 5% (**) 160 µA
Vsatpin10 Voltage Saturationon pin10 Sink Currentat Pin10= 1mA 0.7 V
(*) See built-inS/C protection description
(**)Pin10 Pulled-upto5V with10KΩ;RL =4Ω
(***) Saturatedsquare wave output.
TDA73773/10
0.22µFDIAGNOSTICS7
C10 2200µF
D94AU063A
10µF
10KR1
ST-BYFL 0.22µFFR 5 0.22µFINRL 0.22µFRR 11 47µF
1000µF
100nF 2200µF
C11 2200µF
C12 2200µF
OUTFL
OUTFR
OUTRL
OUTRR89 10
STANDARD TEST AND APPLICATION CIRCUIT
Figure1: Quad Stereo 0.47µF
DIAGNOSTICS7
D94AU064A
10µF
10KR1
ST-BYL 0.47µFINR 47µF
1000µF
100nF
OUTL 10
OUTR
Figure2: Double Bridge
0.22µF
DIAGNOSTICS7
D94AU065A
10µF
10K
ST-BYL
0.47µF BRIDGE 12
47µF
1000µF100nF
OUTL 10
OUT
BRIDGE11
0.22µFL
OUTR
2200µF
2200µF
Figure3: Stereo/Bridge
Note:C9, C10, C11, C12 couldbe
reducedif the2Ω operationisnot
required.
TDA73774/10
High ApplicationFlexibilityThe availabilityof4 independent channels makes possibleto accomplish several kindsof applica-
tions ranging from4 speakers stereo (F/R)to2
speakers bridge solutions. caseof workingin single ended conditions the
polarityof the speakers driven by the inverting
amplifier mustbe reversed respectto those driven noninverting channels.
Thisisto avoid phase inconveniences causing
sound alterations especially during the reproduc-
tionof low frequencies.
Easy Single Endedto Bridge TransitionThe change from single endedto bridge configu-
rationsis made simplyby meansofa short circuit
across the inputs, thatisno needof further exter-
nal components.
Gain Internally Fixedto 20dBin Single Ended,
26dB inBridgeAdvantagesof this design choice arein termsof:
componentsand space saving
output noise, supply voltage rejection and dis-
tortion optimization.
Silent Turn On/Off and Muting/Stand-by Func-
tionThe stand-by canbe easily activatedby meansof CMOS level appliedto pin7 througha RC filter.
Under stand-by condition the deviceis turnedoff
completely (supply current= 1µA typ.; output at-
tenuation= 80dB min.).
Every ON/OFF operationis virtually pop free.
Furthemore,at turn-on the device staysin muting
condition fora time determined by the value as-
signedto the SVR capacitor.
Whilein muting the device outputs becomes in-
sensitiveto any kindsof signal that may be pre-
sentat the input terminals.In other words every
transient coming from previous stages produces unplesantacoustic effectto the speakers.
STAND-BY DRIVING (pin7)Some precautions havetobe takenin the defini-
tionof stand-by driving networks: pin7 cannotbe
directly drivenbya voltage source whose current
capabilityis higher than 5mA.In practical cases series resistance has alwaysto be inserted,
havingit the double purposeof limiting the cur-
rentat pin7 andto smooth down the stand-by
ON/OFF transitions-in combination witha ca-
pacitor-for output pop prevention. any case,a capacitorofat least 100nF from
pin7to S-GND, withno resistancein between,is
necessaryto ensure correct turn-on.
OUTPUT STAGEThe fully complementary output stage was made
possible by the developmentofa new compo-
nent: the ST exclusivepower ICV PNP. novel design based upon the connection shown fig. 20 has then allowed the full exploitationof
its possibilities.
The clear advantagesthis new approachhas over
classical output stagesareas follows:
Rail-to-Rail Output Voltage Swing With No
Needof Bootstrap Capacitors.The output swingis limited onlyby the VCEsat the output transistors, whichisin the range 0.3Ω (Rsat) each.
Classical solutions adopting composite PNP-
NPN for the upper output stage have higher
saturationlosson the top sideof the waveform.
This unbalanced saturation causesa signifi-
cant power reduction. The only wayto recover
power consistsof the additionof expensive
bootstrap capacitors.
Absolute Stability Without Any External
Compensation.Referring to the circuit of fig. 20 the gain
VOut/VInis greater than unity, approximately1+
R2/R1. The DC output (VCC/2)is fixed by an
auxiliary amplifier commontoall the channels. controlling the amountof this local feedbackit possibleto force the loop gain (A*β)to less
than unityat frequencyfor which the phase shift 180°. This means that the output bufferisin-
trinsically stableand not proneto oscillation.
Most remarkably, the above feature has been
achievedin spiteof the very low closed loop
gainof the amplifier. contrast, with the classical PNP-NPN stage,
the solution adopted for reducing the gainat
high frequencies makes use of external RC
networks, namely the Boucherot cells.
BUILT–IN SHORT CIRCUIT PROTECTION
Figure 20: TheNew Output Stage
TDA73775/10
Reliable and safe operation,in presenceof all
kindsof short circuit involving the outputsis as-
sured by BUILT-IN protectors. Additionallyto the
AC/DC short circuitto GND,to VS, across the
speaker,a SOFT SHORT conditionis signalled
out during the TURN-ON PHASEso assuring cor-
rect operation for the device itself and for the
loudspeaker.
This particular kindof protection actsina wayto
avoid that the deviceis turned on (by ST-BY)
whena resistive path (less than16 ohms)is pre-
sent between the output and GND. As the in-
volved circuitryis normally disabled whena cur-
rent higher than 5mAis flowing into the ST-BY
pin,itis important,in order notto disableit,to
have the external current source driving the ST- pin limitedto 5mA.
This extra function becomes particularly attractive
when,in the single ended configuration, one ca-
pacitoris shared between two outputs (see fig.
21).
Supposing that the output capacitor Cout for any
reasonis shorted, the loudspeaker will not be
damaged being this soft short circuit condition re-
vealed.
Diagnostics FacilityThe TDA7377is equipped witha diagnostic cir-
cuitry ableto detect the following events:
Clippingin the output signal
Thermal shutdown
Output fault: shortto GND shorttoVS soft shortat turnon
The informationis available across an open
collector output (pin 10) througha current sink-
ing when the eventis detected current sinkingat pin 10is triggered whena
certain distortion levelis reachedat anyof the
outputs. This function allows gain compression
possibility whenever the amplifieris overdriven.
Thermal Shutdown this case the output10 will signal the proximity the junction temperature to the shutdown
threshold. Typically current sinkingat pin 10 will
start ~10°C before the shutdown thresholdis
reached.
HANDLING OF THE DIAGNOSTICS INFORMA-
Figure 21.
Figure 22: Clipping Detection Waveforms
Figure 23: Output Fault Waveforms (see fig. 24)
TDA7377
TDA73776/10
