TDA2005
20W BRIDGE AMPLIFIER FOR CAR RADIO
October 1998
1
2
3
4
5
6
7
9
10
11
8
BOOTSTRAP(1)
INPUT-(1)
SVRR
GND
INPUT-(2)
INPUT+(2)
OUTPUT(2)
+VS
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%.
Highreliabilityof thechipand packagewithaddi-
tional complete safety during operation thanks to
protectionagainst:
.OUTPUT DC AND AC SHORT CIRCUIT TO
GROUND
.OVERRATINGCHIP TEMPERATURE
.LOAD DUMPVOLTAGESURGE
.FORTUITOUS OPEN GROUND
.VERYINDUCTIVE LOADS
Flexibilityin use : bridgeor stereoboosterampli-
fierswith or withoutboostrapandwithprogramma-
ble gain and bandwidth.
Space and cost saving : very low number of
external components, very simple mounting sys-
tem with no electrical isolation between the pack-
age and the heatsink(one screw only).
In addition,the circuit offers loudspeaker protec-
tion during short circuit for one wire to ground.
DESCRIPTION
The TDA2005isclassB dualaudio poweramplifier
in MULTIWATTpackagespecificallydesignedfor
car radio application : power booster amplifiers
are easilydesignedusing thisdevicethatprovides
a high currentcapability (up to 3.5 A) and that can
drive very low impedance loads (down to 1.6Ωin
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VsOperating Supply Voltage 18 V
VsDC Supply Voltage 28 V
VsPeak Supply Voltage (for 50 ms) 40 V
Io(*) 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 Tcase =60°
C30 W
Tstg,T
jStorage and Junction Temperature – 40 to 150 °C
(*) The max. output current is internally limited.
1/20
SCHEMATIC DIAGRAM
THERMALDATA
Symbol Parameter Value Unit
Rthj-case Thermal ResistanceJunction-case Max. 3 °C/W
TDA2005
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Figure 1 : Testand ApplicationCircuit (Bridgeamplifier)
Figure 2 : P.C.Board and Components Layout of Figure 1 (1:1scale)
BRIDGE AMPLIFIER APPLICATION (TDA2005M)
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ELECTRICALCHARACTERISTICS (referto the Bridge applicationcircuit, Tamb =25
oC, GV=50dB,
Rth (heatsink)=4
o
C/W, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VsSupply Voltage 8 18 V
Vos Output Offset Voltage (1)
(between pin 8 and pin 10) Vs= 14.4V
Vs= 13.2V 150
150 mV
mV
IdTotal Quiescent Drain Current Vs= 14.4V RL=4Ω
V
s= 13.2V RL= 3.2Ω75
70 150
160 mA
mA
PoOutput Power d = 10% f = 1 Hz
Vs= 14.4V RL=4
Ω
R
L= 3.2Ω
Vs= 13.2V RL= 3.2 Ω
18
20
17
20
22
19
W
d Distortion f = 1kHz
Vs= 14.4V RL=4Ω
P
o= 50mW to 15W
Vs= 13.2V RL= 3.2Ω
Po= 50mW to 13W
1
1
%
%
ViInput Sensitivity f = 1kHz
Po=2W R
L=4Ω
P
o=2W R
L= 3.2Ω9
8mV
mV
RiInput Resistance f = 1kHz 70 kΩ
fLLow Frequency Roll Off (– 3dB) RL= 3.2Ω40 Hz
fHHigh Frequency Roll Off (– 3dB) RL= 3.2Ω20 kHz
GvClosed Loop Voltage Gain f = 1kHz 50 dB
eNTotal Input Noise Voltage Rg= 10kΩ(2) 310µ
V
SVR Supply Voltage Rejection Rg= 10kΩ,C
4=10µF
f
ripple = 100Hz, Vripple = 0.5V 45 55 dB
ηEfficiency Vs= 14.4V, f = 1 kHz
Po= 20W RL=4Ω
P
o= 22W RL= 3.2Ω
Vs= 13.2V, f = 1 kHz
Po= 19W RL= 3.2Ω
60
60
58
%
%
%
TjThermal Shut-down Junction
Temperature Vs= 14.4V, RL=4
Ω
f = 1kHz, Ptot = 13W 145 °C
VOSH Output Voltagewith oneSide of
the Speaker shorted to ground Vs= 14.4V RL=4Ω
V
s= 13.2V RL= 3.2Ω2V
Notes : 1. For TDA2005M only
2. Bandwith Filter :22Hz to 22kHz.
TDA2005
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Figure5 : Distortion versusOutput Power
(bridgeamplifier)
BRIDGE AMPLIFIER DESIGN
The following consideraionscan be useful when designing a bridge amplifier.
Parameter Single Ended Bridge
Vomax Peak OutputVoltage (before clipping) 1
2(Vs–2V
CE sat)Vs–2V
CE sat
Io max Peak OutputCurrent (before clippling) 1
2VS−2V
CE sat
RL
VS−2V
CE sat
RL
Pomax RMS Output Power(before clipping) 1
4(VS−2V
CE sat)2
2R
L
(V
S−2V
CE sat)2
2RL
Where : VCE sat = outputtransistors saturation voltage
VS= allowablesupply voltage
RL= loadimpedance
Figure 3 : Output Offset Voltage versus
SupplyVoltage Figure 4 : Distortion versusOutputPower
(bridge amplifier)
TDA2005
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Voltage and current swings are twice for a bridge
amplifierincomparisonwithsingleendedamplifier.
In order words, with the same RLthe bridge con-
figuration can deliver an output power that is four
times the outputpower of a singleended amplifier,
while,with the samemax output currentthebridge
configuration can deliver an output power that is
twice the output powerof a single ended amplifier.
Core must be taken when selecting VSand RLin
order to avoid an output peak current above the
absolute maximum rating.
From the expression for IOmax, assuming VS
= 14.4Vand VCE sat = 2V, the minimum load that
can be driven by TDA2005 in bridge configuration
is :
RL min =VS−2V
CEsat
IOmax =14.4 −4
3.5 =2.97Ω
Thevoltagegainof thebridgeconfigurationisgiven
by (seeFigure 34) :
GV=V0
V1=1+ R
1
R2⋅R
4
R
2+R
4
+R
3
R
4
Forsufficientlyhighgains(40 to50dB)itis possible
to put R2=R
4andR3=2R
1
, simplifingtheformula
in :
GV=4R
1
R
2
G
v(dB) R1(Ω)R
2
=R
4(Ω)R
3
(Ω)
40
50 1000
1000 39
12 2000
2000
Figure 6 : BridgeConfiguration
Figure 7 : TypicalApplicationCircuit
STEREOAMPLIFIER APPLICATION (TDA2005S)
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ELECTRICALCHARACTERISTICS (referto the Stereo applicationcircuit,Tamb =25
oC, GV=50dB,
Rth (heatsink) =4o
C/W, unless otherwwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VsSupply Voltage 8 18 V
VoQuiescent Output Voltage Vs= 14.4V
Vs= 13.2V 6.6
67.2
6.6 7.8
7.2 V
V
IdTotal Quiescent Drain Current Vs= 14.4V
Vs= 13.2V 65
62 120
120 mA
mA
PoOutput Power (each channel) f = 1kHz, d = 10%
Vs= 14.4V RL=4Ω
R
L= 3.2Ω
RL=2Ω
R
L= 1.6Ω
Vs= 13.2V RL= 3.2Ω
RL= 1.6Ω
Vs= 16V RL=2Ω
6
7
9
10
6
9
6.5
8
10
11
6.5
10
12
W
d Distortion (each channel) f = 1kHz
Vs= 14.4V RL=4
Ω
P
o= 50mW to 4W
Vs= 14.4V RL=2Ω
P
o= 50mW to 6W
Vs= 13.2V RL= 3.2Ω
Po= 50mW to 3W
Vs= 13.2V RL= 1.6Ω
Po= 40mW to 6W
0.2
0.3
0.2
0.3
1
1
1
1
%
%
%
%
CT Cross Talk (1) Vs= 14.4V, Vo=4V
RMS
RL=4
Ω
,R
g=5k
Ω
f = 1kHz
f = 10kHz 60
45
dB
ViInput Saturation Voltage 300 mV
ViInput Sensitivity f = 1kHz, Po=1W
R
L=4Ω
R
L= 3.2Ω6
5.5
mV
RiInput Resistance f = 1kHz 70 200 kΩ
fLLow Frequency Roll Off (– 3dB) RL=2Ω50 Hz
fHHigh Frequency Roll Off (– 3dB) RL=2
Ω15 kHz
GvVoltage Gain (open loop) f = 1kHz 90 dB
GvVoltage Gain (closed loop) f = 1kHz 48 50 51 dB
∆GvClosed LoopGain Matching 0.5 dB
eNTotal Input Noise Voltage Rg= 10kΩ(2) 1.5 5 µV
SVR Supply Voltage Rejection Rg= 10kΩ,C
3=10µF
f
ripple = 100Hz, Vripple = 0.5V 35 45 dB
ηEfficiency Vs= 14.4V, f= 1kHz
Po= 6.5W RL=4Ω
P
o= 10W RL=2Ω
V
s= 13.2V, f= 1kHz
Po= 6.5W RL= 3.2Ω
Po= 100W RL= 1.6Ω
70
60
70
60
%
%
%
%
Notes : 1. For TDA2005Monly
2. Bandwith Filter :22Hz to 22kHz.
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Figure 10 : Distortion versusOutput Power
(Stereoamplifier)
Figure 8 : QuiescentOutput Voltageversus
SupplyVoltage (Stereoamplifier) Figure 9 : QuiescentDrain Current versus
SupplyVoltage (Stereoamplifier)
Figure 11 : OutputPowerversus SupplyVoltage
(Stereoamplifier)
Figure 12 : Output Power versus SupplyVoltage
(Stereoamplifier) Figure 13 : Distortion versus Frequency
(Stereoamplifier)
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Figure 14 : Distortion versusFrequency
(Stereoamplifier) Figure 15 : Supply Voltage Rejection versus C3
(Stereoamplifier)
Figure 16 : SupplyVoltage Rejectionversus
Frequency(Stereo amplifier) Figure 17 : Supply Voltage Rejectionversus
C2 and C3 (Stereo amplifier)
Figure 18 : SupplyVoltage Rejectionversus
C2 and C3 (Stereo amplifier) Figure 19 : Gain versus Input Sensitivity
(Stereoamplifier)
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Figure 20 : Gain versusInput Sensitivity
(Stereoamplifier)
Figure 21 : Total Power Dissipation and Effi-
ciencyversus OutputPower
(Bridge amplifier)
Figure 22 : Total Power Dissipation and Effi-
ciency versusOutput Power
(Stereoamplifier)
TDA2005
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Comp. Recom.
Value Purpose Larger Than Smaller Than
R1120 kΩOptimization of the Output
Symmetry Smaller Po max Smaller Po max
R21kΩ
R32kΩ
R
4
,R
512 ΩClosed Loop Gain Setting (see
Bridge Amplifier Design) (*)
R6,R
71ΩFrequency Stability Danger of Oscillationat High
Frequency with Inductive Loads
C12.2 µFInput DC Decoupling
C22.2 µFOptimization of Turn on Pop and
Turn on Delay High Turn on Delay Higher Turn on Pop, Higher
Low Frequency Cut-off,
Increase of Noise
C30.1 µFSupply by Pass Danger of Oscillation
C410 µFRipple Rejection Increase of SVR, Increase of
the Switch-on Time Degradation of SVR.
C5,C
7100 µFBootstrapping Increase of Distortion
at low Frequency
C6,C
8220 µFFeedback Input DC Decoupling,
Low Frequency Cut-off Higher Low Frequency
Cut-off
C9,C
10 0.1 µFFrequency Stability Danger of Oscillation
(*) The closed loop gain must be higherthan 32dB.
APPLICATION SUGGESTION
The recommendedvalues of the componentsare those shown on Bridge applicatiioncircuit of Figure1.
Different valuescan be used ; the following table can help the designer.
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Figure 23 : Bridge Amplifier without Boostrap
Figure 24 : P.C.Board and ComponentsLayoutof Figure23 (1:1 scale)
APPLICATION INFORMATION
TDA2005
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Figure 25 : Low Cost Bridge Amplifier(GV= 42dB)
Figure 26 : P.C.Board and ComponentsLayoutof Figure25 (1:1 scale)
APPLICATION INFORMATION (continued)
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Figure 27 : 10 + 10 W Stereo Amplifier with ToneBalanceand LoudnessControl
Figure 28 : Tone ControlResponse
(circuitof Figure 29)
APPLICATION INFORMATION (continued)
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Figure 29 : 20WBus Amplifier
Figure 30 : Simple20W Two WayAmplifier (FC=2kHz)
APPLICATION INFORMATION (continued)
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Figure 31 : Bridge AmplifierCircuit suited for Low-gain Applications(GV= 34dB)
Figure 32 : Exampleof MutingCircuit
APPLICATION INFORMATION (continued)
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BUILT-IN PROTECTION SYSTEMS
LoadDump Voltage Surge
The TDA2005 has a circuit which enables it to
withstanda voltagepulsetrain,onPin9, ofthetype
shownin Figure 34.
If the supplyvoltage peaks to morethan 40V,then
an LC filter must be inserted between the supply
and pin 9, in order to assure that the pulses at pin
9 willbe held withing the limits shown.
AsuggestedLCnetworkisshowninFigure33.With
this network, a trainof pulses with amplitude up to
120V and width of 2ms can be appliedat point A.
This type of protection is ON when the supply
voltage(pulse or DC)exceeds18V.Forthisreason
the maximum operatingsupply voltageis 18V.
Figure 33
Figure 34
Short Circuit (ACand DC conditions)
TheTDA2005canwithstandapermanentshort-cir-
cuit on the outputfor a supply voltage up to 16V.
PolarityInversion
High current (up to 10A) can be handled by the
devicewith no damagefor a longerperiod thanthe
blow-out time of a quick 2A fuse (normally con-
nected in series with the supply). This feature is
added to avoid destruction, if during fitting to the
car, a mistake on the connection of the supply is
made.
OpenGround
When the ratio is in the ON condition and the
ground is accidentally opened, a standard audio
amplifierwillbedamaged.OntheTDA2005protec-
tion diodesare included to avoidany damage.
Inductive Load
A protection diode is provided to allow use of the
TDA2005with inductive loads.
DCVoltage
The maximum operating DC voltage for the
TDA2005is 18V.
Howeverthedevicecanwithstanda DCvoltageup
to 28V with no damage.This could occur during
winterif twobatteriesareseriesconnectedtocrank
the engine.
Thermal Shut-down
The presenceof a thermallimiting circuitoffersthe
following advantages:
1) an overload on the output (even if it is
permanent), or an excessive ambient
temperaturecan be easilywithstood.
2) the heatsink can havea smaller factorof safety
compared with that of a conventional circuit.
There is no device damage in the case of
excessive junction temperature : all that
happensis thatPO(andthereforePtot)andIdare
reduced.
The maximum allowable power dissipation de-
pendsuponthesizeof theexternalheatsink(i.e.its
thermal resistance); Figure 35 shows the dissipa-
blepoweras a functionof ambienttemperaturefor
differentthermal resistance.
LoudspeakerProtection
The circuit offers loudspeaker protection during
short circuit for one wire to ground.
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Figure 35 : Maximum Allowable Power Dissipa-
tion versusAmbient Temperature Figure 36 : OutputPowerand Drain Currentver-
sus Case Temperature
Figure 37 : Output Power and Drain Current ver-
sus CaseTemperature
TDA2005
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Multiwatt11 V
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.88 0.95 0.035 0.037
G 1.45 1.7 1.95 0.057 0.067 0.077
G1 16.75 17 17.25 0.659 0.669 0.679
H1 19.6 0.772
H2 20.2 0.795
L 21.9 22.2 22.5 0.862 0.874 0.886
L1 21.7 22.1 22.5 0.854 0.87
0.886
L2 17.4 18.1 0.685
0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.73 5.08 5.43 0.186 0.200 0.214
S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102
Dia1 3.65 3.85 0.144 0.152
OUTLINE AND
MECHANICAL DATA
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use of such informationnor for any infringement of patents or other rights ofthird parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specificationmentioned in this publicationare subject to
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