Datasheet - Electronic circuits magazine

®TDA200520W BRIDGE AMPLIFIER FOR CAR RADIOHigh output power : PO = 10 + 10 W@RL = 2Ω, d =10% ; PO = 20W@RL = 4Ω , d = 1 %.High reliability of the chip and package with additionalcomplete safety during operation thanks to.protection against :OUTPUT DC AND AC SHORT CIRCUIT TOGROUNDOVERRATING CHIP TEMPERATURE.LOAD DUMP VOLTAGE SURGEFORTUITOUS OPEN GROUNDVERY INDUCTIVE LOADSFlexibility in use : bridge or stereo booster amplifierswith or without boostrap and with programmablegain and bandwidth.Space and cost saving : very low number of externalcomponents, very simple mounting system withno electrical isolation between the package and theheatsink (one screw only).In addition, the circuit offers loudspeaker protectionduring short circuit for one wire to ground.ABSOLUTE MAXIMUM RATINGSPIN CONNECTIONMULTIWATT11ORDERING NUMBERS : TDA2005M (Bridge Appl.)TDA2005S (Stereo Appl.)DESCRIPTIONThe TDA2005 is class B dual audio power amplifierin MULTIWATT® package specifically designed forcar radio application : power booster amplifiersare easily designed using this device that providesa high current capability (up to 3.5 A) and that candrive very low impedance loads (down to 1.6Ω inSymbol Parameter Value UnitV s Operating Supply Voltage 18 VV s DC Supply Voltage 28 VV s Peak Supply Voltage (for 50 ms) 40 VI o (*) Output Peak Current (non repetitive t = 0.1 ms) 4.5 AI o (*) Output Peak Current (repetitive f ≥ 10 Hz) 3.5 AP tot Power Dissipation at T case = 60 °C 30 WT stg , T j Storage and Junction Temperature – 40 to 150 °C(*) The max. output current is internally limited.1110987654321BOOTSTRAP(1)OUTPUT(1)+V SOUTPUT(2)BOOTSTRAP(2)GNDINPUT+(2)INPUT-(2)SVRRINPUT-(1)INPUT+(1)TAB CONNECTED TO PIN 6D95AU318September 20031/18

TDA2005SCHEMATIC DIAGRAMTHERMAL DATASymbol Parameter Value UnitR th j-case Thermal Resistance Junction-case Max. 3 °C/W2/18

TDA2005BRIDGE AMPLIFIER APPLICATION (TDA2005M)Figure 1 : Test and Application Circuit (Bridge amplifier)Figure 2 : P.C. Board and Components Layout of Figure 1 (1:1 scale)3/18

TDA2005ELECTRICAL CHARACTERISTICS (refer to the Bridge application circuit, Tamb = 25 o C, GV = 50dB,Rth (heatsink) = 4 o C/W, unless otherwise specified)Symbol Parameter Test Conditions Min. Typ. Max. UnitV s Supply Voltage 8 18 VV os Output Offset Voltage (1)(between pin 8 and pin 10)V s = 14.4VV s = 13.2VI d Total Quiescent Drain Current V s = 14.4V R L = 4ΩV s = 13.2V R L = 3.2ΩP o Output Power d = 10% f = 1 HzV s = 14.4V R L = 4ΩR L = 3.2ΩV s = 13.2V R L = 3.2 Ωd Distortion f = 1kHzV s = 14.4V R L = 4ΩP o = 50mW to 15WV s = 13.2V R L = 3.2ΩP o = 50mW to 13W11%%V i Input Sensitivity f = 1kHzP o = 2W R L = 4Ω9mVP o = 2W R L = 3.2Ω8mVR i Input Resistance f = 1kHz 70 kΩf L Low Frequency Roll Off (– 3dB) R L = 3.2Ω 40 Hzf H High Frequency Roll Off (– 3dB) R L = 3.2Ω 20 kHzG v Closed Loop Voltage Gain f = 1kHz 50 dBe N Total Input Noise Voltage R g = 10kΩ (2) 3 10 µVSVR Supply Voltage Rejection R g = 10kΩ, C 4 = 10µF45 55 dBf ripple = 100Hz, V ripple = 0.5Vh Efficiency V s = 14.4V, f = 1 kHzP o = 20W R L = 4Ω60%P o = 22W R L = 3.2Ω60%V s = 13.2V, f = 1 kHzP o = 19W R L = 3.2Ω58%T jV OSHThermal Shut-down JunctionTemperatureOutput Voltage with one Side ofthe Speaker shorted to groundNotes : 1. For TDA2005M only2. Bandwith Filter : 22Hz to 22kHz.V s = 14.4V, R L = 4Ωf = 1kHz, P tot = 13W1820177570202219150150150160mVmVmAmAW145 °CV s = 14.4V R L = 4ΩV s = 13.2V R L = 3.2Ω 2 V4/18

TDA2005Figure 3 :Output Offset Voltage versusSupply VoltageFigure 4 :Distortion versus Output Power(bridge amplifier)Figure 5 :Distortion versus Output Power(bridge amplifier)BRIDGE AMPLIFIER DESIGNThe following consideraions can be useful when designing a bridge amplifier.V o maxI o maxP o maxWhere :Parameter Single Ended BridgePeak Output Voltage (before clipping)12 (V s – 2 V CE sat ) V s – 2 V CE satPeak Output Current (before clippling)RMS Output Power (before clipping)VCE sat = output transistors saturation voltageVS = allowable supply voltageRL = load impedance1 V S − 2 V CE sat2 R LV S − 2 V CE satR L1 (V S − 2 V CE sat ) 2 (V S − 2 V CE sat ) 24 2 R L 2 R L5/18

TDA2005Voltage and current swings are twice for a bridgeamplifier in comparison with single ended amplifier.In order words, with the same RL the bridge configurationcan deliver an output power that is fourtimes the output power of a single ended amplifier,while, with the same max output current the bridgeconfiguration can deliver an output power that istwice the output power of a single ended amplifier.Core must be taken when selecting VS and RL inorder to avoid an output peak current above theabsolute maximum rating.From the expression for IO max, assuming VS= 14.4V and VCE sat = 2V, the minimum load thatcan be driven by TDA2005 in bridge configurationis :RL min = V S − 2 V CEsatI O max=14.4 −43.5= 2.97ΩThe voltage gain of the bridge configuration is givenby (see Figure 34) :GV = V0V1 = 1 +R1⎛ R2 ⋅ R4⎜⎝R2 + R4+ R3⎞ R4⎟⎠For sufficiently high gains (40 to 50dB) it is possibleto put R2 = R4 and R3 = 2 R1, simplifing the formulain :GV = 4 R 1R 2G v (dB) R 1 (Ω) R 2 = R 4 (Ω) R 3 (Ω)405010001000Figure 6 : Bridge Configuration391220002000STEREO AMPLIFIER APPLICATION (TDA2005S)Figure 7 : Typical Application Circuit6/18

TDA2005Figure 20 :Gain versus Input Sensitivity(Stereo amplifier)Figure 21 :Total Power Dissipation and Efficiencyversus Output Power(Bridge amplifier)Figure 22 :Total Power Dissipation and Efficiencyversus Output Power(Stereo amplifier)10/18

TDA2005APPLICATION SUGGESTIONThe recommended values of the components are those shown on Bridge applicatiion circuit of Figure 1.Different values can be used ; the following table can help the designer.Comp.Recom.ValuePurpose Larger Than Smaller ThanR 1 120 kΩ Optimization of the OutputSymmetrySmaller P o maxSmaller P o maxR 2R 31kΩ2 kΩR 4 , R 5 12 Ω Closed Loop Gain Setting (seeBridge Amplifier Design) (*)R 6, R 7 1 Ω Frequency Stability Danger of Oscillation at HighFrequency with Inductive LoadsC 1 2.2 µF Input DC DecouplingC 2 2.2 µF Optimization of Turn on Pop andTurn on DelayHigh Turn on DelayHigher Turn on Pop, HigherLow Frequency Cut-off,Increase of NoiseC 3 0.1 µF Supply by Pass Danger of OscillationC 4 10 µF Ripple Rejection Increase of SVR, Increase ofthe Switch-on TimeDegradation of SVR.C 5 , C 7 100 µF Bootstrapping Increase of Distortionat low FrequencyC 6, C 8 220 µF Feedback Input DC Decoupling,Low Frequency Cut-offHigher Low FrequencyCut-offC 9, C 10 0.1 µF Frequency Stability Danger of Oscillation(*) The closed loop gain must be higher than 32dB.11/18

TDA2005APPLICATION INFORMATIONFigure 23 : Bridge Amplifier without BoostrapFigure 24 : P.C. Board and Components Layout of Figure 23 (1:1 scale)12/18

TDA2005APPLICATION INFORMATION (continued)Figure 25 : Low Cost Bridge Amplifier (GV = 42dB)Figure 26 : P.C. Board and Components Layout of Figure 25 (1:1 scale)13/18

TDA2005APPLICATION INFORMATION (continued)Figure 27 : 10 + 10 W Stereo Amplifier with Tone Balance and Loudness ControlFigure 28 :Tone Control Response(circuit of Figure 29)14/18

TDA2005APPLICATION INFORMATION (continued)Figure 29 : 20W Bus AmplifierFigure 30 : Simple 20W Two Way Amplifier (FC = 2kHz)15/18

TDA2005APPLICATION INFORMATION (continued)Figure 31 : Bridge Amplifier Circuit suited for Low-gain Applications (GV = 34dB)Figure 32 : Example of Muting Circuit16/18

TDA2005BUILT-IN PROTECTION SYSTEMSLoad Dump Voltage SurgeThe TDA2005 has a circuit which enables it towithstand a voltage pulse train, on Pin 9, of the typeshown in Figure 34.If the supply voltage peaks to more than 40V, thenan LC filter must be inserted between the supplyand pin 9, in order to assure that the pulses at pin9 will be held withing the limits shown.A suggested LC network is shown in Figure 33. Withthis network, a train of pulses with amplitude up to120V and width of 2ms can be applied at point A.This type of protection is ON when the supplyvoltage (pulse or DC) exceeds 18V. For this reasonthe maximum operating supply voltage is 18V.Figure 33Figure 34Open GroundWhen the ratio is in the ON condition and theground is accidentally opened, a standard audioamplifier will be damaged. On the TDA2005 protectiondiodes are included to avoid any damage.Inductive LoadA protection diode is provided to allow use of theTDA2005 with inductive loads.DC VoltageThe maximum operating DC voltage for theTDA2005 is 18V.However the device can withstand a DC voltage upto 28V with no damage. This could occur duringwinter if two batteries are series connected to crankthe engine.Thermal Shut-downThe presence of a thermal limiting circuit offers thefollowing advantages :1) an overload on the output (even if it ispermanent), or an excessive ambienttemperature can be easily withstood.2) the heatsink can have a smaller factor of safetycompared with that of a conventional circuit.There is no device damage in the case ofexcessive junction temperature : all thathappens is that PO (and therefore Ptot) and Id arereduced.The maximum allowable power dissipation dependsupon the size of the external heatsink (i.e. itsthermal resistance) ; Figure 35 shows the dissipablepower as a function of ambient temperature fordifferent thermal resistance.Loudspeaker ProtectionThe circuit offers loudspeaker protection duringshort circuit for one wire to ground.Short Circuit (AC and DC conditions)The TDA2005 can withstand a permanent short-circuiton the output for a supply voltage up to 16V.Polarity InversionHigh current (up to 10A) can be handled by thedevice with no damage for a longer period than theblow-out time of a quick 2A fuse (normally connectedin series with the supply). This feature isadded to avoid destruction, if during fitting to thecar, a mistake on the connection of the supply ismade.17/18

TDA2005Figure 35 :Maximum Allowable Power Dissipationversus Ambient TemperatureFigure 36 :Output Power and Drain Current versusCase TemperatureFigure 37 :Output Power and Drain Current versusCase Temperature18/18

TDA2005DIM.mminchMIN. TYP. MAX. MIN. TYP. MAX.A 5 0.197B 2.65 0.104C 1.6 0.063D 1 0.039E 0.49 0.55 0.019 0.022F 0.88 0.95 0.035 0.037G 1.45 1.7 1.95 0.057 0.067 0.077G1 16.75 17 17.25 0.659 0.669 0.679H1 19.6 0.772H2 20.2 0.795L 21.9 22.2 22.5 0.862 0.874 0.886L1 21.7 22.1 22.5 0.854 0.87 0.886L2 17.4 18.1 0.685 0.713L3 17.25 17.5 17.75 0.679 0.689 0.699L4 10.3 10.7 10.9 0.406 0.421 0.429L7 2.65 2.9 0.104 0.114M 4.25 4.55 4.85 0.167 0.179 0.191M1 4.73 5.08 5.43 0.186 0.200 0.214S 1.9 2.6 0.075 0.102S1 1.9 2.6 0.075 0.102Dia1 3.65 3.85 0.144 0.152OUTLINE ANDMECHANICAL DATAMultiwatt11 V19/18

TDA2005Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequencesof use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is grantedby implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject tochange without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are notauthorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.The ST logo is a registered trademark of STMicroelectronics.All other names are the property of their respective owners© 2003 STMicroelectronics - All rights reservedSTMicroelectronics GROUP OF COMPANIESAustralia – Belgium - Brazil - Canada - China – Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan- Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United Stateswww.st.com20/18