TDA2005 - Kitsrus

® 

TDA2005 

20W BRIDGE AMPLIFIER FOR CAR RADIO 

High output power : PO = 10 + 10 W@RL =2Ω, 

d = 10% ; P O = 20W@R L =4Ω,d=1%. 

High reliability of the chip and package with additional 

. 

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 amplifiers 

with or without boostrapand with programmable 

gain and bandwidth. 

Space and cost saving : very low number of 

external components, very simple mounting system 

with no electrical isolation between the package 

and the heatsink (one screw only). 

In addition, the circuit offers loudspeaker protection 

during short circuit for one wire to ground. 

ABSOLUTE MAXIMUM RATINGS 

PIN CONNECTION 

MULTIWATT11 

ORDERING NUMBERS : TDA2005M (Bridge Appl.) 

TDA2005S (Stereo Appl.) 

DESCRIPTION 

The TDA2005 is class B dual audio power amplifier 

in MULTIWATT® packagespecifically 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 

Symbol Parameter Value Unit 

V s Operating Supply Voltage 18 V 

V s 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 

I o (*) Output Peak Current (repetitive f ≥ 10 Hz) 3.5 A 

P tot 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. 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

BOOTSTRAP(1) 

OUTPUT(1) 

+V S 

OUTPUT(2) 

BOOTSTRAP(2) 

GND 

INPUT+(2) 

INPUT-(2) 

SVRR 

INPUT-(1) 

INPUT+(1) 

TAB CONNECTED TO PIN 6 

D95AU318 

October 1998 

1/20


SCHEMATIC DIAGRAM 

THERMAL DATA 

Symbol Parameter Value Unit 

Rth j-case Thermal Resistance Junction-case Max. 3 °C/W 

2/20


BRIDGE 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) 

3/20


ELECTRICAL CHARACTERISTICS (refer to the Bridge applicationcircuit, Tamb =25 o C, GV = 50dB, 

Rth (heatsink) =4 o C/W, unless otherwise specified) 

Symbol Parameter Test Conditions Min. Typ. Max. Unit 

V s Supply Voltage 8 18 V 

V os Output Offset Voltage (1) 

(between pin 8 and pin 10) 

V s = 14.4V 

V s = 13.2V 

Id Total Quiescent Drain Current V s = 14.4V R L =4Ω 

Vs= 13.2V RL = 3.2Ω 

P o Output Power d = 10% f = 1 Hz 

V s = 14.4V R L =4Ω 

R L = 3.2Ω 

V s = 13.2V R L = 3.2 Ω 

d Distortion f = 1kHz 

V s = 14.4V R L =4Ω 

P o = 50mW to 15W 

V s = 13.2V R L = 3.2Ω 

P o = 50mW to 13W 

V i Input Sensitivity f = 1kHz 

Po =2W RL =4Ω 

P o =2W R L = 3.2Ω 

R i Input Resistance f = 1kHz 70 kΩ 

f L Low Frequency Roll Off (– 3dB) R L = 3.2Ω 40 Hz 

f H High Frequency Roll Off (– 3dB) R L = 3.2Ω 20 kHz 

G v Closed Loop Voltage Gain f = 1kHz 50 dB 

e N Total Input Noise Voltage R g = 10kΩ (2) 3 10 µV 

SVR Supply Voltage Rejection R g = 10kΩ, C 4 =10µF 

f ripple = 100Hz, V ripple = 0.5V 

45 55 dB 

η Efficiency V s = 14.4V, f = 1 kHz 

P o = 20W R L =4Ω 

P o = 22W R L = 3.2Ω 

Vs = 13.2V, f = 1 kHz 

Po = 19W RL = 3.2Ω 

T j Thermal Shut-down Junction 

Temperature 

V OSH Output Voltage with one Side of 

Notes : 1. the For Speaker TDA2005M shorted only to ground 

2. Bandwith Filter :22Hz to 22kHz. 

V s = 14.4V, R L =4Ω 

f = 1kHz, P tot = 13W 

18 

20 

17 

75 

70 

20 

22 

19 

9 

8 

60 

60 

58 

150 

150 

150 

160 

1 

1 

mV 

mV 

mA 

mA 

W 

% 

% 

mV 

mV 

% 

% 

% 

145 °C 

V s = 14.4V R L =4Ω 

V s = 13.2V R L = 3.2Ω 2 V 

4/20


Figure 3 : 

Output Offset Voltage versus 

Supply Voltage 

Figure 4 : 

Distortion versus Output Power 

(bridge amplifier) 

Figure 5 : 

Distortion versus Output Power 

(bridge amplifier) 

BRIDGE AMPLIFIER DESIGN 

The following consideraions can be useful when designing a bridge amplifier. 

V omax 

I o max 

P omax 

Where : 

Parameter Single Ended Bridge 

Peak Output Voltage (before clipping) 

Peak Output Current (before clippling) 

RMS Output Power (before clipping) 

VCE sat = output transistors saturation voltage 

VS = allowable supply voltage 

RL = load impedance 

1 

2 (V s –2V CE sat ) V s –2V CE sat 

1 VS − 2V CE sat 

2 R L 

V S − 2V CE sat 

R L 

1 (V S − 2V CE sat ) 2 (V S −2V CE sat ) 2 

4 2R L 2R L 

5/20


Voltage and current swings are twice for a bridge 

amplifier in comparison with single endedamplifier. 

In order words, with the same RL the bridge configuration 

can deliver an output power that is four 

times the output power of a single ended amplifier, 

while, with the same max output current the bridge 

configuration can deliver an output power that is 

twice the output power of a single ended amplifier. 

Core must be taken when selecting VS and RL in 

order to avoid an output peak current above the 

absolute maximum rating. 

From the expression for IOmax, assuming VS 

= 14.4V and VCE sat = 2V, the minimum load that 

can be driven by TDA2005 in bridge configuration 

is : 

RL min = V S − 2V CEsat 

I Omax 

= 

14.4 −4 

3.5 

= 2.97Ω 

The voltagegainof thebridge configurationisgiven 

by (see Figure 34) : 

G V = V 0 R 1 

=1+ 

V 1 

⎛ 

⎜ 

⎝ 

+ R 3 

R 2 ⋅R 4 ⎞ R 4 

R 2 +R ⎟⎠ 4 

Forsufficiently high gains (40 to 50dB) it is possible 

to put R2 =R4and R3 =2R1, simplifing the formula 

in : 

GV =4 R 1 

R 2 

G v (dB) R 1 (Ω) R 2 =R 4 (Ω) R 3 (Ω) 

40 

50 

1000 

1000 

39 

12 

Figure 6 : Bridge Configuration 

2000 

2000 

STEREO AMPLIFIER APPLICATION (TDA2005S) 

Figure 7 : Typical Application Circuit 

6/20


ELECTRICAL CHARACTERISTICS (refer to the Stereo application circuit, Tamb =25 o C, GV = 50dB, 

Rth (heatsink) =4 o C/W, unless otherwwise specified) 

Symbol Parameter Test Conditions Min. Typ. Max. Unit 

V s Supply Voltage 8 18 V 

V o Quiescent Output Voltage V s = 14.4V 

V s = 13.2V 

Id Total Quiescent Drain Current Vs = 14.4V 

V s = 13.2V 

P o Output Power (each channel) f = 1kHz, d = 10% 

V s = 14.4V R L =4Ω 

R L = 3.2Ω 

R L =2Ω 

R L = 1.6Ω 

V s = 13.2V R L = 3.2Ω 

R L = 1.6Ω 

V s = 16V R L =2Ω 

d Distortion (each channel) f = 1kHz 

V s = 14.4V R L =4Ω 

P o = 50mW to 4W 

V s = 14.4V R L =2Ω 


V s = 13.2V R L = 3.2Ω 

Po = 50mW to 3W 

V s = 13.2V R L = 1.6Ω 


CT Cross Talk (1) V s = 14.4V, V o =4V RMS 

R L =4Ω,R g =5kΩ 

f = 1kHz 

f = 10kHz 

V i Input Saturation Voltage 300 mV 

V i Input Sensitivity f = 1kHz, P o =1W 

RL=4Ω 

R L = 3.2Ω 

R i Input Resistance f = 1kHz 70 200 kΩ 

f L Low Frequency Roll Off (– 3dB) RL =2Ω 50 Hz 

f H High Frequency Roll Off (– 3dB) R L =2Ω 15 kHz 

G v Voltage Gain (open loop) f = 1kHz 90 dB 

G v Voltage Gain (closed loop) f = 1kHz 48 50 51 dB 

∆ G v Closed Loop Gain Matching 0.5 dB 

e N Total Input Noise Voltage R g = 10kΩ (2) 1.5 5 µV 

SVR Supply Voltage Rejection R g = 10kΩ, C 3 =10µF 

f ripple = 100Hz, V ripple = 0.5V 

35 45 dB 

η Efficiency V s = 14.4V, f = 1kHz 

P o = 6.5W R L =4Ω 

P o = 10W R L =2Ω 

Vs= 13.2V, f = 1kHz 

Po = 6.5W RL = 3.2Ω 

Po = 100W RL = 1.6Ω 

Notes : 1. For TDA2005M only 

2. Bandwith Filter :22Hz to 22kHz. 

6.6 

6 

6 

7 

9 

10 

6 

9 

7.2 

6.6 

65 

62 

6.5 

8 

10 

11 

6.5 

10 

12 

0.2 

0.3 

0.2 

0.3 

60 

45 

6 

5.5 

70 

60 

70 

60 

7.8 

7.2 

120 

120 

1 

1 

1 

1 

V 

V 

mA 

mA 

W 

% 

% 

% 

% 

dB 

mV 

% 

% 

% 

% 

7/20


Figure 8 : 

Quiescent Output Voltage versus 

Supply Voltage (Stereo amplifier) 

Figure 9 : 

Quiescent Drain Current versus 

Supply Voltage (Stereo amplifier) 

Figure 10 : Distortion versus Output Power 

(Stereo amplifier) 

Figure 11 : Output Power versus Supply Voltage 


Figure 12 : Output Power versus Supply Voltage 


Figure 13 : Distortion versus Frequency 


8/20


Figure 14 : Distortion versus Frequency 


Figure 15 : Supply Voltage Rejection versus C3 


Figure 16 : Supply Voltage Rejection versus 

Frequency (Stereo amplifier) 


C2 and C3 (Stereo amplifier) 


C2 and C3 (Stereo amplifier) 

Figure 19 : Gain versus Input Sensitivity 


9/20


Figure 20 : Gain versus Input Sensitivity 


Figure 21 : Total Power Dissipation and Efficiency 

versus Output Power 

(Bridge amplifier) 

Figure 22 : Total Power Dissipation and Efficiency 

versus Output Power 


10/20


APPLICATION SUGGESTION 

The 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. 

Value 

Purpose Larger Than Smaller Than 

R 1 120 kΩ Optimization of the Output 

Symmetry 

Smaller P o max 

Smaller P o max 

R 2 

R3 

1kΩ 

2kΩ 

R 4 ,R 5 12 Ω Closed Loop Gain Setting (see 

Bridge Amplifier Design) (*) 

R6, R7 1Ω Frequency Stability Danger of Oscillation at High 

Frequency with Inductive Loads 

C 1 2.2 µF Input DC Decoupling 

C 2 2.2 µF Optimization of Turn on Pop and 

Turn on Delay 

High Turn on Delay 

Higher Turn on Pop, Higher 

Low Frequency Cut-off, 

Increase of Noise 

C 3 0.1 µF Supply by Pass Danger of Oscillation 

C4 10 µF Ripple Rejection Increase of SVR, Increase of 

the Switch-on Time 

Degradation of SVR. 

C 5 ,C 7 100 µF Bootstrapping Increase of Distortion 

at low Frequency 

C6, C8 220 µF Feedback Input DC Decoupling, 

Low Frequency Cut-off 

Higher Low Frequency 

Cut-off 

C 9 ,C 10 0.1 µF Frequency Stability Danger of Oscillation 

(*) The closed loop gain must be higher than 32dB. 

11/20


APPLICATION INFORMATION 

Figure 23 : Bridge Amplifier without Boostrap 

Figure 24 : P.C.Board and ComponentsLayout of Figure 23 (1:1 scale) 

12/20


APPLICATION INFORMATION (continued) 

Figure 25 : Low Cost Bridge Amplifier (G V = 42dB) 

Figure 26 : P.C.Board and ComponentsLayout of Figure 25 (1:1 scale) 

13/20



Figure 27 : 10 + 10 W Stereo Amplifier with Tone Balance and LoudnessControl 

Figure 28 : Tone Control Response 

(circuit of Figure 29) 

14/20



Figure 29 : 20W Bus Amplifier 

Figure 30 : Simple 20W Two Way Amplifier (FC = 2kHz) 

15/20



Figure 31 : Bridge Amplifier Circuit suited for Low-gain Applications (GV = 34dB) 

Figure 32 : Example of Muting Circuit 

16/20


BUILT-IN PROTECTION SYSTEMS 

Load Dump Voltage Surge 

The TDA2005 has a circuit which enables it to 

withstanda voltagepulse train, on Pin 9, of the type 

shown in Figure 34. 

If the supply voltage peaks to more than 40V, then 

an LC filter must be inserted between the supply 

and pin 9, in order to assure that the pulses at pin 

9 will be held withing the limits shown. 

AsuggestedLC networkis shownin Figure33.With 

this network, a train of pulses with amplitude up to 

120V and width of 2ms can be applied at point A. 

This type of protection is ON when the supply 

voltage (pulse or DC) exceeds 18V.For this reason 

the maximum operating supply voltage is 18V. 

Figure 33 

Figure 34 

Open Ground 

When the ratio is in the ON condition and the 

ground is accidentally opened, a standard audio 

amplifier will be damaged.On the TDA2005 protection 

diodes are included to avoid any damage. 

Inductive Load 

A protection diode is provided to allow use of the 

TDA2005 with inductive loads. 

DC Voltage 

The maximum operating DC voltage for the 

TDA2005 is 18V. 

However the device can withstand a DC voltageup 

to 28V with no damage. This could occur during 

winterif twobatteriesare seriesconnectedto crank 

the engine. 

Thermal Shut-down 

The presence of a thermallimiting circuit offers the 

following advantages : 

1) an overload on the output (even if it is 

permanent), or an excessive ambient 

temperature can be easily withstood. 

2) the heatsink can have a smaller factor of safety 

compared with that of a conventional circuit. 

There is no device damage in the case of 

excessive junction temperature : all that 

happensis thatPO (and thereforePtot) and Id are 

reduced. 

The maximum allowable power dissipation depends 

upon the size of the externalheatsink(i.e.its 

thermal resistance) ; Figure 35 shows the dissipable 

power as a function of ambient temperature for 

different thermal resistance. 

Loudspeaker Protection 

The circuit offers loudspeaker protection during 

short circuit for one wire to ground. 

Short Circuit (AC and DC conditions) 

TheTDA2005can withstanda permanentshort-circuit 

on the output for a supply voltage up to 16V. 

Polarity Inversion 

High current (up to 10A) can be handled by the 

device with no damage for a longer period than the 

blow-out time of a quick 2A fuse (normally connected 

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. 

17/20


Figure 35 : Maximum Allowable Power Dissipation 

versus Ambient Temperature 

Figure 36 : Output Power and Drain Current versus 

Case Temperature 

Figure 37 : Output Power and Drain Current versus 

Case Temperature 

18/20


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 

Multiwatt11 V 

19/20


Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of 

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 granted 

by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to 

change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not 

authorized 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 

© 1998 STMicroelectronics – Printed in Italy – All Rights Reserved 

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TDA2005 - Kitsrus

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