TDA2005 20W BRIDGE AMPLIFIER FOR CAR RADIO September 2003 1 2 3 4 5 6 7 9 10 11 8 BOOTSTRAP(1) INPUT-(1) SVRR GND INPUT-(2) INPUT+(2) OUTPUT(2) +V S OUTPUT(1) INPUT+(1) TAB CONNECTED TO PIN 6 D95AU318 BOOTSTRAP(2) PIN CONNECTION MULTIWATT11 ORDERING NUMBERS : TDA2005M (Bridge Appl.) TDA2005S (Stereo Appl.) ® High output power : PO = 10 + 10 W@RL = 2Ω, d = 10% ; PO = 20W@RL = 4Ω , d = 1 %. High reliability of the chip and package with addi- tional complete safety during operation thanks to protection against : . OUTPUT DC AND AC SHORT CIRCUIT TO GROUND . OVERRATING CHIP TEMPERATURE . LOAD DUMP VOLTAGE SURGE . FORTUITOUS OPEN GROUND . VERY INDUCTIVE LOADS Flexibility in use : bridge or stereo booster amplifi- ers with or without boostrap and with programma- ble gain and bandwidth. Space and cost saving : very low number of exter- nal components, very simple mounting system with no electrical isolation between the package and the heatsink (one screw only). In addition, the circuit offers loudspeaker protec- tion during short circuit for one wire to ground. DESCRIPTION The TDA2005 is class B dual audio power amplifier in MULTIWATTpackage specifically designed for car radio application : power booster amplifiers are easily designed using this device that provides a high current capability (up to 3.5 A) and that can drive very low impedance loads (down to 1.6Ω in ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vs Operating Supply Voltage 18 V Vs DC Supply Voltage 28 V V s Peak Supply Voltage (for 50 ms) 40 V I o (*) Output Peak Current (non repetitive t = 0.1 ms) 4.5 A Io (*) Output Peak Current (repetitive f ≥ 10 Hz) 3.5 A Ptot Power Dissipation at T case = 60 °C 30 W T stg , T j Storage and Junction Temperature – 40 to 150 °C (*) The max. output current is internally limited. 1/18 Downloaded from Elcodis.com electronic components distributor
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High output power : PO = 10 + 10 W@RL = 2Ω, d =10% ; PO = 20W@RL = 4Ω , d = 1 %.High reliability of the chip and package with addi-tional complete safety during operation thanks toprotection against : .OUTPUT DC AND AC SHORT CIRCUIT TO
GROUND.OVERRATING CHIP TEMPERATURE .LOAD DUMP VOLTAGE SURGE .FORTUITOUS OPEN GROUND .VERY INDUCTIVE LOADSFlexibility in use : bridge or stereo booster amplifi-ers with or without boostrap and with programma-ble gain and bandwidth.Space and cost saving : very low number of exter-nal components, very simple mounting system withno electrical isolation between the package and theheatsink (one screw only).In addition, the circuit offers loudspeaker protec-tion during short circuit for one wire to ground.
DESCRIPTION
The 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 in
ABSOLUTE MAXIMUM RATINGSSymbol Parameter Value Unit
Vs Operating Supply Voltage 18 VVs DC Supply Voltage 28 VVs Peak Supply Voltage (for 50 ms) 40 V
Io (*) Output Peak Current (non repetitive t = 0.1 ms) 4.5 AIo (*) Output Peak Current (repetitive f ≥ 10 Hz) 3.5 APtot Power Dissipation at Tcase = 60 °C 30 W
Tstg, Tj Storage and Junction Temperature – 40 to 150 °C(*) The max. output current is internally limited.
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Voltage and current swings are twice for a bridgeamplifier in comparison with single ended amplifier.In order words, with the same RL the bridge con-figuration can 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 = VS − 2 VCEsat
IO max =
14.4 −43.5
= 2.97Ω
The voltage gain of the bridge configuration is givenby (see Figure 34) :
GV = V0
V1 = 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 R1
R2
Gv (dB) R1 (Ω) R2 = R4 (Ω) R3 (Ω)
4050
10001000
3912
20002000
Figure 6 : Bridge Configuration
Figure 7 : Typical Application Circuit
STEREO AMPLIFIER APPLICATION (TDA2005S)
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R6, R7 1 Ω Frequency Stability Danger of Oscillation at HighFrequency with Inductive Loads
C1 2.2 µF Input DC Decoupling
C2 2.2 µF Optimization of Turn on Pop andTurn on Delay
High Turn on Delay Higher Turn on Pop, HigherLow Frequency Cut-off,Increase of Noise
C3 0.1 µF Supply by Pass Danger of Oscillation
C4 10 µF Ripple Rejection Increase of SVR, Increase ofthe Switch-on Time
Degradation of SVR.
C5, C7 100 µF Bootstrapping Increase of Distortionat low Frequency
C6, C8 220 µF Feedback Input DC Decoupling,Low Frequency Cut-off
Higher Low Frequency Cut-off
C9, C10 0.1 µF Frequency Stability Danger of Oscillation
(*) The closed loop gain must be higher than 32dB.
APPLICATION 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.
TDA2005
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Load 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 33
Figure 34
Short Circuit (AC and DC conditions)The TDA2005 can withstand a permanent short-cir-cuit on 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 con-nected in series with the supply). This feature isadded to avoid destruction, if during fitting to thecar, a mistake on the connection of the supply ismade.
Open GroundWhen the ratio is in the ON condition and theground is accidentally opened, a standard audioamplifier will be damaged. On the TDA2005 protec-tion diodes 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 is
permanent ), 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 de-pends upon the size of the external heatsink (i.e. itsthermal resistance) ; Figure 35 shows the dissipa-ble power as a function of ambient temperature fordifferent thermal resistance.
Loudspeaker ProtectionThe circuit offers loudspeaker protection duringshort circuit for one wire to ground.
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