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TDA2005

(R)

20W BRIDGE AMPLIFIER FOR CAR RADIO
High output power : PO = 10 + 10 W@RL = 2Ohm,
d = 10% ; PO = 20W@RL = 4Ohm , 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 boostrap and 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.

.
.
.
.
.

MULTIWATT11
ORDERING NUMBERS : TDA2005M (Bridge Appl.)
TDA2005S (Stereo Appl.)

DESCRIPTION
The TDA2005 is class B dual audio power amplifier
in MULTIWATT(R) package 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 1.6Ohm in

ABSOLUTE MAXIMUM RATINGS
Symbol
Vs
Vs
Vs
Io (*)
Io (*)
Ptot
Tstg, Tj

Parameter
Operating Supply Voltage
DC Supply Voltage
Peak Supply Voltage (for 50 ms)
Output Peak Current (non repetitive t = 0.1 ms)
Output Peak Current (repetitive f >= 10 Hz)
Power Dissipation at Tcase = 60 °C
Storage and Junction Temperature

Value
18
28
40
4.5
3.5
30
- 40 to 150

Unit
V
V
V
A
A
W
°C

(*) The max. output current is internally limited.

PIN CONNECTION
11

BOOTSTRAP(1)

10

OUTPUT(1)
+VS

9
8

OUTPUT(2)

7

BOOTSTRAP(2)

6

GND

5

INPUT+(2)

4

INPUT-(2)

3

SVRR

2

TAB CONNECTED TO PIN 6

October 1998

INPUT-(1)

1

INPUT+(1)

D95AU318

1/20

TDA2005
SCHEMATIC DIAGRAM

THERMAL DATA
Symbol
R th j-case
2/20

Parameter
Thermal Resistance Junction-case

Value
Max.

Unit

3

°C/W

TDA2005
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

TDA2005
ELECTRICAL CHARACTERISTICS (refer to the Bridge applicationcircuit, Tamb = 25oC, GV = 50dB,
Rth (heatsink) = 4oC/W, unless otherwise specified)
Symbol

Parameter

Test Conditions

Vs

Supply Voltage

Vos

Output Offset Voltage (1)
(between pin 8 and pin 10)
Total Quiescent Drain Current

Vs = 14.4V
Vs = 13.2V

RL = 4Ohm
RL = 3.2Ohm

Po

Output Power

d = 10%
Vs = 14.4V

f = 1 Hz
RL = 4Ohm
RL = 3.2Ohm
RL = 3.2 Ohm

d

Distortion

Typ.

Vs = 14.4V
Vs = 13.2V

Id

Min.
8

Vs = 13.2V

Vi

Input Sensitivity

75
70

V

150
150

mV
mV

150
160

mA
mA
W

18
20
17

20
22
19

1

RL = 4Ohm
RL = 3.2Ohm

%

1

%

9
8

mV
mV
kOhm

Ri

Input Resistance

f = 1kHz

fL

Low Frequency Roll Off (- 3dB)

RL = 3.2Ohm

fH

High Frequency Roll Off (- 3dB)

RL = 3.2Ohm

Gv

Closed Loop Voltage Gain

f = 1kHz

50

eN

Total Input Noise Voltage

Rg = 10kOhm (2)

3

SVR

Supply Voltage Rejection

Rg = 10kOhm, C4 = 10uF
fripple = 100Hz, Vripple = 0.5V

Efficiency

Vs = 14.4V, f = 1
Po = 20W
Po = 22W
Vs = 13.2V, f = 1
Po = 19W

?

Tj
VOSH
Notes :

4/20

70
40
20

kHz
RL = 4Ohm
RL = 3.2Ohm
kHz
RL = 3.2Ohm

Thermal Shut-down Junction
Temperature

Vs = 14.4V, RL = 4Ohm
f = 1kHz, Ptot = 13W

Output Voltage with one Side of

Vs = 14.4V
Vs = 13.2V

1. the Speaker shorted to ground
For TDA2005M only
2.
Bandwith Filter : 22Hz to 22kHz.

Unit

18

f = 1kHz
RL = 4Ohm
Vs = 14.4V
Po = 50mW to 15W
Vs = 13.2V
RL = 3.2Ohm
Po = 50mW to 13W
f = 1kHz
Po = 2W
Po = 2W

Max.

RL = 4Ohm
RL = 3.2Ohm

45

Hz
kHz
dB

10

uV

55

dB

60
60

%
%

58

%

145

°C

2

V

TDA2005
Figure 3 :

Output Offset Voltage versus
Supply Voltage

Figure 5 :

Figure 4 :

Distortion versus Output Power
(bridge amplifier)

Distortion versus Output Power
(bridge amplifier)

BRIDGE AMPLIFIER DESIGN
The following consideraions can be useful when designing a bridge amplifier.
Parameter
Vo max

Peak Output Voltage (before clipping)

Io max

Peak Output Current (before clippling)

Po max

RMS Output Power (before clipping)

Where :

Single Ended
1
(Vs - 2 VCE sat)

Vs - 2 VCE sat

1 VS - 2 VCE sat
2
RL

VS - 2 VCE sat
RL

2
1 (VS - 2 VCE sat)
2 RL
4

(VS - 2 VCE sat)2
2 RL

2

Bridge

VCE sat = output transistors saturation voltage
VS = allowable supply voltage
RL = load impedance

5/20

TDA2005
Voltage and current swings are twice for a bridge
amplifier in comparison with single ended amplifier.
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 I Omax, assuming VS
= 14.4V and VCE sat = 2V, the minimum load that
can be driven by TDA2005 in bridge configuration
is :
VS - 2 VCEsat 14.4 -4
= 2.97Ohm
=
RL min =
IO max
3.5
The voltage gain of the bridge configurationisgiven
by (see Figure 34) :
V0
R1
R3
=1+
+
GV =
V1
? R2 ? R4 ? R4
?
?
? R2 + R4 ?
STEREO AMPLIFIER APPLICATION (TDA2005S)
Figure 7 : Typical Application Circuit

6/20

For sufficiently high gains (40 to 50dB) it is possible
to put R2 = R4 and R3 = 2 R1, simplifing the formula
in :
R1
GV = 4

R2

Gv (dB)

R 1 (Ohm)

R2 = R4 (Ohm)

R3 (Ohm)

40
50

1000
1000

39
12

2000
2000

Figure 6 : Bridge Configuration

TDA2005
ELECTRICAL CHARACTERISTICS (refer to the Stereo application circuit, Tamb = 25oC, GV = 50dB,
Rth (heatsink) = 4oC/W, unless otherwwise specified)
Symbol

Parameter

Test Conditions

Vs

Supply Voltage

Vo

Quiescent Output Voltage

Vs = 14.4V
Vs = 13.2V

Id

Total Quiescent Drain Current
Output Power (each channel)

f = 1kHz, d = 10%
Vs = 14.4V
RL = 4Ohm
RL = 3.2Ohm
RL = 2Ohm
RL = 1.6Ohm
Vs = 13.2V
RL = 3.2Ohm
RL = 1.6Ohm
Vs = 16V
RL = 2Ohm

d

Distortion (each channel)

CT

Cross Talk (1)

Vi

Input Sensitivity

Max.

Unit

18

V

7.2
6.6

7.8
7.2

V
V

120
120

mA
mA

8
6.6
6

W
6
7
9
10
6
9

f = 1kHz
RL = 4Ohm
Vs = 14.4V
Po = 50mW to 4W
Vs = 14.4V
RL = 2Ohm
Po = 50mW to 6W
Vs = 13.2V
RL = 3.2Ohm
Po = 50mW to 3W
RL = 1.6Ohm
Vs = 13.2V
Po = 40mW to 6W

6.5
8
10
11
6.5
10
12

0.2

1

%

0.3

1

%

0.2

1

%

0.3

Vs = 14.4V, Vo = 4VRMS
RL = 4Ohm, Rg = 5kOhm
f = 1kHz
f = 10kHz

Input Saturation Voltage

Vi

Typ.

65
62

Vs = 14.4V
Vs = 13.2V

Po

Min.

1

%
dB

60
45
300

f = 1kHz, Po = 1W
RL = 4Ohm
RL = 3.2Ohm

Ri

Input Resistance

f = 1kHz

fL

Low Frequency Roll Off (- 3dB)

mV
mV
6
5.5

RL = 2Ohm

fH

High Frequency Roll Off (- 3dB)

RL = 2Ohm

Gv

Voltage Gain (open loop)
Voltage Gain (closed loop)

f = 1kHz

? Gv

15
48

eN

Total Input Noise Voltage

Rg = 10kOhm (2)

Supply Voltage Rejection

Rg = 10kOhm, C3 = 10uF
fripple = 100Hz, Vripple = 0.5V

Efficiency

Vs = 14.4V, f = 1kHz
Po = 6.5W
RL = 4Ohm
Po = 10W
RL = 2Ohm
Vs = 13.2V, f = 1kHz
Po = 6.5W
RL = 3.2Ohm
Po = 100W
RL = 1.6Ohm

Notes :

1.
2.

50

dB
51

0.5

SVR

1.5
35

Hz
kHz

90

Closed Loop Gain Matching

?

kOhm

200
50

f = 1kHz

Gv

70

dB
dB

5

uV

45

dB

70
60

%
%

70
60

%
%

For TDA2005M only
Bandwith Filter : 22Hz to 22kHz.

7/20

TDA2005
Figure 8 :

Quiescent Output Voltage versus
Supply Voltage (Stereo amplifier)

Figure 10 : Distortion versus Output Power
(Stereo amplifier)

Figure 12 : Output Power versus Supply Voltage
(Stereo amplifier)

8/20

Figure 9 :

Quiescent Drain Current versus
Supply Voltage (Stereo amplifier)

Figure 11 : Output Power versus Supply Voltage
(Stereo amplifier)

Figure 13 : Distortion versus Frequency
(Stereo amplifier)

TDA2005
Figure 14 : Distortion versus Frequency
(Stereo amplifier)

Figure 15 : Supply Voltage Rejection versus C3
(Stereo amplifier)

Figure 16 : Supply Voltage Rejection versus
Frequency (Stereo amplifier)

Figure 17 : Supply Voltage Rejection versus
C2 and C3 (Stereo amplifier)

Figure 18 : Supply Voltage Rejection versus
C2 and C3 (Stereo amplifier)

Figure 19 : Gain versus Input Sensitivity
(Stereo amplifier)

9/20

TDA2005

Figure 20 : Gain versus Input Sensitivity
(Stereo amplifier)

Figure 22 : Total Power Dissipation and Efficiency versus Output Power
(Stereo amplifier)

10/20

Figure 21 : Total Power Dissipation and Efficiency versus Output Power
(Bridge amplifier)

TDA2005
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

R1

120 kOhm

R2

1k Ohm

R3

2 kOhm

R4, R5

12 Ohm

Closed Loop Gain Setting (see
Bridge Amplifier Design) (*)

R6, R7

1Ohm

Frequency Stability

C1

2.2 uF

Input DC Decoupling

C2

2.2 uF

Optimization of Turn on Pop and
Turn on Delay

C3

0.1 uF

Supply by Pass

C4

10 uF

Ripple Rejection

C5, C7

100 uF

Bootstrapping

Increase of Distortion
at low Frequency

C6, C8

220 uF

Feedback Input DC Decoupling,
Low Frequency Cut-off

Higher Low Frequency
Cut-off

C 9, C10

0.1 uF

Frequency Stability

Danger of Oscillation

Purpose
Optimization of the Output
Symmetry

Larger Than
Smaller Po max

Smaller Than
Smaller Po max

Danger of Oscillation at High
Frequency with Inductive Loads

High Turn on Delay

Higher Turn on Pop, Higher
Low Frequency Cut-off,
Increase of Noise
Danger of Oscillation

Increase of SVR, Increase of
the Switch-on Time

Degradation of SVR.

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

11/20

TDA2005
APPLICATION INFORMATION
Figure 23 : Bridge Amplifier without Boostrap

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

12/20

TDA2005
APPLICATION INFORMATION (continued)
Figure 25 : Low Cost Bridge Amplifier (GV = 42dB)

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

13/20

TDA2005
APPLICATION INFORMATION (continued)
Figure 27 : 10 + 10 W Stereo Amplifier with Tone Balance and LoudnessControl

Figure 28 : Tone Control Response
(circuit of Figure 29)

14/20

TDA2005
APPLICATION INFORMATION (continued)
Figure 29 : 20W Bus Amplifier

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

15/20

TDA2005
APPLICATION INFORMATION (continued)
Figure 31 : Bridge Amplifier Circuit suited for Low-gain Applications (GV = 34dB)

Figure 32 : Example of Muting Circuit

16/20

TDA2005
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.
A suggestedLC 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.

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 voltage up
to 28V with no damage. This could occur during
winter if twobatteries are series connectedto crank
the engine.

Figure 33

Figure 34

Thermal Shut-down
The presence of a thermal limiting circuit offers the
following advantages :
1) an overload on the output (even if it is
p erm an e n t ), o r a n ex c es si ve a mb ien t
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
happens is that PO (and thereforePtot) and Id are
reduced.
The maximum allowable power dissipation depends upon the size of the external heatsink(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)
TheTDA2005 can 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

TDA2005
Figure 35 : Maximum Allowable Power Dissipation versus Ambient Temperature

Figure 37 : Output Power and Drain Current versus Case Temperature

18/20

Figure 36 : Output Power and Drain Current versus Case Temperature

TDA2005
DIM.

mm
MIN.

TYP.

inch
MAX.

MIN.

TYP.

MAX.

A

5

0.197

B

2.65

0.104

C

1.6

OUTLINE AND
MECHANICAL DATA

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

L3

17.25

17.5

17.75

0.679

0.689

0.699

0.713

L4

10.3

10.7

10.9

0.406

0.421

0.429

L7

2.65

2.9

0.104

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

0.114

Multiwatt11 V

19/20

TDA2005

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
(C) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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