20 W bridge/stereo amplifier for car radio
Features
■ High output power:
–P
= 10 + 10 W @ RL = 2 Ω, THD = 10 %
o
–P
= 20 W @ RL = 4 Ω , THD = 10 %.
o
■ Protection against:
– Output DC and AC short circuit to ground
– Overrating chip temperature
– Load dump voltage surge
– Fortuitous open ground
– Very inductive loads
■ Loudspeaker protection during short circuit for
one wire to ground
Description
The TDA2005 is a class B dual audio power
amplifier in Multiwatt11 package specifically
designed for car radio applications.
Table 1. Device summary
TDA2005
Multiwatt11
Power booster amplifiers can be easily designed
using this device that provides a high current
capability (up to 3.5 A) and can drive very low
impedance loads (down to 1.6 Ω in stereo
applications) obtaining an output power of more
than 20 W (bridge configuration).
Order code Package Packing
TDA2005R Multiwatt11 Tube
(1)
(1)
Multiwatt11 Tube
Multiwatt11 Tube
www.st.com
TDA2005M
TDA2005S
1. Do not use for New Design.
January 2010 Doc ID 1451 Rev 4 1/25
1
Contents TDA2005
Contents
1 Schematic and pins connection diagrams . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Bridge amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3.1 Electrical characteristics (bridge application) . . . . . . . . . . . . . . . . . . . . . . 7
2.3.2 Bridge amplifier design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Stereo amplifier application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4.1 Electrical characteristics (stereo application) . . . . . . . . . . . . . . . . . . . . . 11
3 Application suggestion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Built-in protection systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1.1 Load dump voltage surge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1.2 Short circuit (AC and DC conditions) . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1.3 Polarity inversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1.4 Open ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1.5 Inductive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1.6 DC voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1.7 Thermal shut-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1.8 Loudspeaker protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2/25 Doc ID 1451 Rev 4
TDA2005 List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Electrical characteristics (bridge application) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Bridge amplifier design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6. High gain vs. Rx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 7. Electrical characteristics (stereo application) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 8. Recommended values of the component of the bridge application circuit . . . . . . . . . . . . . 15
Table 9. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Doc ID 1451 Rev 4 3/25
List of figures TDA2005
List of figures
Figure 1. Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pins connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Test and application circuit (bridge amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. PC board and components layout of Figure 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. Output offset voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Distortion vs. output power (R
Figure 7. Distortion vs. output power (R
Figure 8. Bridge configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Typical stereo application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Quiescent output voltage vs. supply voltage (stereo amplifier). . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. Quiescent drain current vs. supply voltage (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 12. Distortion vs. output power (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 13. Output power vs. supply voltage, R
Figure 14. Output power vs. supply voltage, R
Figure 15. Distortion vs. frequency, R
Figure 16. Distortion vs. frequency, R
Figure 17. Supply voltage rejection vs. C3 (stereo amplifier). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 18. Supply voltage rejection vs. frequency (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 19. Supply voltage rejection vs. C2 and C3, G
Figure 20. Supply voltage rejection vs. C2 and C3, G
Figure 21. Gain vs. input sensitivity R
Figure 22. Gain vs. input sensitivity R
Figure 23. Total power dissipation and efficiency vs. output power (bridge) . . . . . . . . . . . . . . . . . . . . 14
Figure 24. Total power dissipation and efficiency vs. output power (stereo) . . . . . . . . . . . . . . . . . . . . 14
Figure 25. Bridge amplifier without boostrap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 26. PC board and components layout of Figure 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 27. Low cost bridge amplifier (GV = 42dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 28. PC board and components layout of Figure 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 29. 10 + 10 W stereo amplifier with tone balance and loudness control. . . . . . . . . . . . . . . . . . 18
Figure 30. Tone control response (circuit of Figure 29) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 31. 20 W bus amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 32. Simple 20 W two way amplifier (FC = 2 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 33. Bridge amplifier circuit suited for low-gain applications (GV = 34 dB) . . . . . . . . . . . . . . . . 20
Figure 34. Example of muting circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 35. Suggested LC network circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 36. Voltage gain bridge configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 37. Maximum allowable power dissipation vs. ambient temperature . . . . . . . . . . . . . . . . . . . . 22
Figure 38. Output power and drain current vs. case temperature (R
Figure 39. Output power and drain current vs. case temperature (R
Figure 40. Multiwatt11 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
= 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
L
= 3.2 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
L
= 2 and 4 Ω (stereo amplifier). . . . . . . . . . . . . . . . . . 12
L
= 1.6 and 3.2Ω (Stereo amplifier) . . . . . . . . . . . . . . . 13
= 2 and 4 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . 13
L
= 1.6 and 3.2 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . 13
L
= 4 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
L
= 2 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
L
L
= 390/1Ω (stereo amplifier) . . . . . . . . . . . . . . 13
V
= 1000/10Ω (stereo amplifier) . . . . . . . . . . . . 14
V
= 4 Ω) . . . . . . . . . . . . . . . . . . . 22
L
= 3.2 Ω) . . . . . . . . . . . . . . . . . . 22
L
4/25 Doc ID 1451 Rev 4
TDA2005 Schematic and pins connection diagrams
1 Schematic and pins connection diagrams
Figure 1. Schematic diagram
Figure 2. Pins connection diagram (top view)
11
10
9
8
7
6
5
4
3
2
1
TAB CONNECTED TO PIN 6
Doc ID 1451 Rev 4 5/25
D95AU318
BOOTSTRAP(1)
OUTPUT(1)
+V
S
OUTPUT(2)
BOOTSTRAP(2)
GND
INPUT+(2)
INPUT-(2)
SVRR
INPUT-(1)
INPUT+(1)
Electrical specifications TDA2005
2 Electrical specifications
2.1 Absolute maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
Peak supply voltage (50 ms) 40
V
S
Operating supply voltage 18
VDC supply voltage 28
(1)
Io
Output peak current (non repetitive t = 0.1 ms) 4.5
Output peak current (repetitive f ≥10 Hz) 3.5
P
tot
T
, T
stg
1. The max. output current is internally limited.
Power dissipation at T
Storage and junction temperature -40 to 150 °C
j
case
2.2 Thermal data
Table 3. Thermal data
Symbol Parameter Value Unit
R
th-j-case
Thermal resistance junction-to-case max 3 °C/W
2.3 Bridge amplifier section
Figure 3. Test and application circuit (bridge amplifier)
A
= 60 °C 20 W
6/25 Doc ID 1451 Rev 4
TDA2005 Electrical specifications
Figure 4. PC board and components layout of Figure 3
2.3.1 Electrical characteristics (bridge application)
Refer to the bridge application circuit T
= 25°C; Gv = 50dB; R
amb
th(heatsink)
= 4°C/W unless
otherwise specified.
Table 4. Electrical characteristics (bridge application)
Symbol Parameter Test condition Min. Typ. Max. Unit
V
S
V
os
I
d
P
o
THD Total harmonic distortion
V
i
R
i
f
L
f
H
Gv Closed loop voltage gain f = 1 kHz - 50 - dB
e
N
SVR Supply voltage rejection
Supply voltage - 8 - 18 V
Output offset voltage
(between pin 8 and pin 10)
Total quiescent drain current
= 14.4 V
V
S
VS = 13.2 V
V
= 14.4 V; RL = 4 Ω
S
= 13.2 V; RL = 3.2 Ω
V
S
--
-
75
70
150
150
150
150
f = 1 kHz, THD = 10 %
Output power
VS = 14.4 V; RL = 4 Ω
VS = 14.4 V; RL = 3.2 Ω
= 13.2 V; RL = 3.2 Ω
V
S
f = 1 kHz; V
= 4 Ω; Po = 50 mW to 15 W;
R
L
f = 1 kHz; V
R
= 3.2 Ω; Po = 50m W to
L
= 14.4 V;
S
= 13.2 V;
S
18
20
17
--1%
--1%
20
22
19
-W
13 W;
f = 1 kHz
Input sensitivity
RL = 4 Ω; Po = 2 W;
= 3.2 Ω; Po = 2 W
R
L
-98-mW
Input resistance f = 1 kHz 70 - - kΩ
Low frequency roll off (-3 dB) RL = 3.2 Ω --40Hz
High frequency roll off (-3 dB) RL = 3.2 Ω 20 - - KHz
Total Input noise voltage Rg = 10 Ω
V
ripple
= 10 kΩ; C4 = 10 μF
R
g
(1)
= 0.5 V; f
ripple
=100 Hz
-310μV
45 55 - dB
mV
mV
mA
mA
Doc ID 1451 Rev 4 7/25
Electrical specifications TDA2005
Table 4. Electrical characteristics (bridge application) (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
f = 1 kHz; VS = 14.4 V;
= 4 Ω; Po = 20 W;
R
L
= 3.2 Ω; Po = 22 W
η Efficiency
R
L
f = 1 kHz; V
RL = 3.2 Ω; Po = 19 W
SVR Supply voltage rejection
T
V
OSH
1. Bandwidth filter: 22 Hz to 22 kHz.
Thermal shut-down junction
j
temperature
Output voltage with one side of
the speaker shorted to ground
f = 100 Hz; V
= 10 kΩ; RL = 4 Ω
R
g
f = 1 kHz; V
= 4 Ω; P
R
L
= 14.4 V; RL = 4 Ω
V
S
VS = 13.2 V; RL = 3.2 Ω
Figure 5. Output offset voltage vs. supply
voltage
V
os
(mV)
100
80
= 13.2 V;
S
= 0.5 V;
ripple
= 14.4V;
S
= 13 W
tot
Figure 6. Distortion vs. output power (RL=
4 Ω)
d
(%)
10
-6060-
-58-
30 36 - dB
- 145 - °C
--2V
Vs = 14.4 V
Gv = 50 dB
R
= 4 Ω
L
f = 1 kHz
%
60
40
20
0
8
10
12
14 16
Vs (V)
Figure 7. Distortion vs. output power (RL=
3.2 Ω)
d
(%)
Vs = 13.2 V
Gv = 50 dB
R
= 3.2 Ω
L
10
1
0.1
f = 1 kHz
110
Po (W)
1
0.1
110
Po (W)
8/25 Doc ID 1451 Rev 4
TDA2005 Electrical specifications
2.3.2 Bridge amplifier design
The following considerations can be useful when designing a bridge amplifier.
Table 5. Bridge amplifier design
Parameter Single ended Bridge
1
V
o max
I
o max
Peak output voltage (before clipping)
Peak Output current (before clipping)
-- -
2V
–()Vs2V
V
s
2
V
1
-----------------------------------
-- -
2
CEsat
2V
–
s
CEsat
R
L
–
CEsat
Vs2V
–
R
CEsat
L
-----------------------------------
P
o max
RMS output power (before clipping)
V
2V
–()
1
s
-- -
-------------------------------------------
4
2R
2
CEsat
L
V
2V
–()
s
-------------------------------------------
2R
2
CEsat
L
Where:
V
V
R
= output transistors saturation voltage
CE sat
= allowable supply voltage
S
= load impedance
L
Voltage and current swings are twice for a bridge amplifier in comparison with single ended
amplifier.
In order words, with the same R
the bridge configuration can deliver an output power that is
L
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 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 V
and RL in order to avoid an output peak current
S
above the absolute maximum rating.
From the expression for I
, assuming VS = 14.4V and V
Omax
= 2V, the minimum load
CE sat
that can be driven by TDA2005 in bridge configuration is:
R
Lmin
–
I
Omax
CEsat
----------------------------------- -
14.4 4–
-------------------- - 2.97Ω===
3.5
Vs2V
The voltage gain of the bridge configuration is given by (see Figure 36):
V
v
0
------ - 1
V
1
G
Doc ID 1451 Rev 4 9/25
R
1
--------------------------
R2R4⋅
⎛⎞
-------------------- -
⎜⎟
R
+
⎝⎠
2R4
R
3
------ -++==
R
4
Electrical specifications TDA2005
For sufficiently high gains (40 to 50 dB) it is possible to put R2 = R4 and R3 = 2R1,
simplifying the formula in:
R
1
------ -
4
=
v
R
2
Table 6. High gain vs. Rx
G
Gv (dB) R1 (Ω)R
40 1000 39 2000
50 1000 12 2000
Figure 8. Bridge configuration
2.4 Stereo amplifier application
Figure 9. Typical stereo application circuit
= R4 (Ω)R
2
3
(Ω)
10/25 Doc ID 1451 Rev 4
TDA2005 Electrical specifications
2.4.1 Electrical characteristics (stereo application)
Refer to the stereo application circuit T
= 25 °C; Gv = 50 dB; R
amb
th(heatsink)
= 4°C/W unless
otherwise specified
Table 7. Electrical characteristics (stereo application)
Symbol Parameter Test condition Min. Typ. Max. Unit
V
S
V
o
I
d
P
o
THD Total harmonic distortion
CT Cross talk
V
i
V
i
R
i
f
L
f
H
G
v
Supply voltage 8 18 V
Quiescent offset voltage
Total quiescent drain current
VS = 14.4 V
VS = 13.2 V
VS = 14.4 V
VS = 13.2 V
6.6
6
7.2
6.6
-
65
62
7.8
7.2
120
120
f = 1 kHz; THD = 10 %
Output power (each channel)
VS = 14.4 V; RL = 4 Ω
= 14.4 V; RL = 3.2 Ω
V
S
= 14.4 V; RL = 2 Ω
V
S
= 14.4 V; RL = 1.6 Ω
V
S
10
6
7
9
6.5
8
10
-W
11
f = 1 kHz; THD = 10 %
= 13.2 V; RL =3.2 Ω
V
S
VS = 13.2 V; RL = 1.6 Ω
V
= 16 V; RL = 2 Ω
S
f = 1 kHz; V
= 4 Ω; Po = 50 mW to 4 W;
R
L
f = 1 kHz; V
= 2 Ω; Po = 50 mW to 6 W;
R
L
f = 1 kHz; V
= 3.2 Ω; Po = 50 mW to 3W;
R
L
f = 1KHz; V
= 1.6Ω; Po = 40mW to 6W;
R
L
V
= 14.4 V; Vo = 4 V
S
= 5 kΩ; RL = 4 Ω;
R
g
= 14.4 V;
S
= 14.4 V;
S
= 13.2 V;
S
= 13.2V;
S
RMS
f = 1 kHz
f = 10 kHz
;
6
9
6.5
10
-W
12
-
-
-
-
-
0.2
0.3
0.2
0.3
60
1%
1%
1%
1%
-
45
Input saturation voltage - 300 - mW
f = 1 kHz; Po = 1W;
Input sensitivity
RL = 4 Ω;
= 3.2Ω;
R
L
-6
5.5
-mV
Input resistance f = 1 kHz 70 200 - kΩ
Low frequency roll off (-3 dB) RL = 2 Ω --50Hz
High frequency roll off (-3 dB) RL = 2 Ω 15 - - kHz
Open loop voltage gain f = 1 kHz - 90 -
Closed loop voltage gain f = 1 kHz 48 50 51
V
V
mA
mA
mW
mW
mV
dB
Doc ID 1451 Rev 4 11/25
Electrical specifications TDA2005
Table 7. Electrical characteristics (stereo application) (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
ΔGv Closed loop gain matching - - 0.5 - dB
e
SVR Supply voltage rejection
Total input noise voltage Rg = 10 kΩ
N
V
ripple
= 10 kΩ; C3 = 10 μF;
R
g
f = 1 kHz; V
= 4 Ω; Po = 6.5 W;
R
L
RL = 2Ω; Po = 10 W;
η Efficiency
f = 1 kHz; V
RL = 3.2 Ω; Po = 6.5 W;
= 1.6 Ω; Po = 100 W;
R
L
1. Bandwidth filter: 22 Hz to 22 kHz.
Figure 10. Quiescent output voltage vs. sup-
ply voltage (stereo amplifier)
V
O
(V)
8
7
6
5
4
(1)
-1.55μV
= 0.5 V; f
S
=100 Hz
ripple
= 14.4 V;
35 45 - dB
-7060-%
= 13.2 V;
S
-7060-%
Figure 11. Quiescent drain current vs. supply
voltage (stereo amplifier)
I
d
(mA)
100
80
60
40
20
08
Figure 12. Distortion vs. output power (stereo
10 12 14 16 Vs (V)
Figure 13. Output power vs. supply voltage,
amplifier)
12/25 Doc ID 1451 Rev 4
d
(%)
f = 1 kHz
Gv = 50 dB
8
6
4
2
0
0.01 0.1 1 Po (W)
Vs = 13.2 V
Vs = 14.4 V
Vs = 13.2 V
Vs = 14.4 V
R
R
L
R
L
L
R
L
= 3.2 Ω
= 4 Ω
= 1.6 Ω
= 2 Ω
08
R
L
P
o
(W)
15
f = 1 kHz
G
d = 10 %
12
9
6
3
0
8
10 12 14 16 Vs (V)
= 2 and 4 Ω (stereo amplifier)
v = 50 dB
RL = 2 Ω
RL = 4 Ω
10
12
14 16
Vs (V)
TDA2005 Electrical specifications
Figure 14. Output power vs. supply voltage,
R
= 1.6 and 3.2Ω (Stereo amplifier)
P
(W)
15
L
o
f = 1 kHz
G
v = 50 dB
d = 10 %
RL = 1.6 Ω
12
9
RL = 3.2 Ω
6
3
0
8
10
12
14 16
Vs (V)
Figure 16. Distortion vs. frequency, RL = 1.6
and 3.2 Ω (stereo amplifier)
(%)
d
= 13.2 V
V
s
Gv = 50 dB
Figure 15. Distortion vs. frequency, R
= 2 and
L
4 Ω (stereo amplifier)
d
(%)
= 14.4 V
V
s
Gv = 50 dB
1.2
= 2.5 W
P
o
R
= 2 Ω
L
0.8
P
= 2.5 W
o
= 4 Ω
R
L
0.4
10
2
10
3
10
4
f (Hz)
10
Figure 17. Supply voltage rejection vs. C3
(stereo amplifier)
SVR
(dB)
10
20
Vs = 14.4 V
= 100 kHz
f
ripple
V
= 0.5 V
ripple
Gv = 50 dB
= 3.2 Ω
R
L
1.2
= 2.5 W
P
o
R
= 1.6 Ω
L
0.8
= 2.5 W
P
o
R
= 3.2 Ω
L
0.4
10
2
10
3
10
4
f (Hz)
10
Figure 18. Supply voltage rejection vs.
frequency (stereo amplifier)
SVR
(dB)
Vs = 14.4 V
Gv = 50 dB
= 10 µF
C
3
60
50
40
30
20
Rg = 0
Rg = 10 kΩ
30
40
50
60
10 12 C
(µF)13
3
Figure 19. Supply voltage rejection vs. C2 and
SVR
(dB)
50
40
30
20
C3, G
Vs = 14.4 V
R
= 4 Ω
L
R
= 10 kΩ
g
Gv = 390/1 Ω
f
ripple
= 390/1Ω (stereo amplifier)
V
= 100 Hz
C2 = 220 µF
C2 = 22 µF
C2 = 5 µF
10 10
2
3
10
f (Hz)
10 20 C
(µF)12 5
3
Doc ID 1451 Rev 4 13/25
Electrical specifications TDA2005
Figure 20. Supply voltage rejection vs. C2 and
C3, G
= 1000/10Ω (stereo amplifier)
= 4 Ω
= 10 kΩ
= 100 Hz
V
C2 = 220 µF
C2 = 22 µF
C2 = 5 µF
10 20 C
(µF)12 5
3
SVR
(dB)
50
40
30
20
Vs = 14.4 V
R
L
R
g
Gv = 1000/10 Ω
f
ripple
Figure 22. Gain vs. input sensitivity RL = 2 Ω
(stereo amplifier)
G
v
(dB)
54
50
46
42
38
34
30
26
22
2468 2 468
10 100
Po = 10 W
Po = 0.5 W
30
VS = 14.4 V
f = 1 kHz
= 2 Ω
R
L
300 V
(mV)
i
G
500
200
100
v
50
20
Figure 24. Total power dissipation and
efficiency vs. output power (stereo)
P
(W)
tot
(%)
η
Figure 21. Gain vs. input sensitivity RL = 4 Ω
(stereo amplifier)
(mV)
i
G
500
200
100
v
50
20
G
v
(dB)
54
50
46
42
38
34
30
26
22
2468 2468
10 100
Po = 6 W
Po = 0.5 W
30
VS = 14.4 V
f = 1 kHz
= 4 Ω
R
L
300 V
Figure 23. Total power dissipation and
efficiency vs. output power (bridge)
P
tot
(W)
12
P
10
8
6
4
2
tot
η
Vs = 14.4 V
R
= 4 Ω
L
f = 1 kHz
Gv = 50 dB
20 24 P
η
(%)
60
40
20
(W)841216
o
6
4
2
P
tot
η
Vs = 13.2 V
= 3.2 Ω
R
L
f = 1 kHz
Gv = 50 dB
10 12 P
60
40
20
(W)4268
o
14/25 Doc ID 1451 Rev 4
TDA2005 Application suggestion
3 Application suggestion
The recommended values of the components are those shown on bridge application circuit
of Figure 3. Different values can be used; the following table can help the designer.
Table 8. Recommended values of the component of the bridge application circuit
Component
Recommended
value
Purpose Larger than Smaller than r
C1 2.2 μF Input DC decoupling - -
High Turn on Pop, Higher
low frequency cutoff
Increase of Noise
C2 2.2 μF
Optimization of turn on
Pop and turn on Delay
High turn on delay
C3 0.1 μF Supply bypass - Danger of oscillation
Increase of SVR,
C4 10 μF Ripple rejection
Increase of the Switch-
Degradation of SVR
on Time
C5, C7 100 μF Bootstrapping -
Feedback input DC
C6, C8 220 μF
decoupling, low
frequency cut-off
-
Increase of distortion at
low frequency
Danger of oscillation at
high frequencies with
inductive loads
C9, C10 0.1 μF Frequency stability - Danger of oscillation
R1 120 kΩ
Optimization of the
output symmetry
Smaller P
omax
Smaller P
omax
R2 1 kΩ ---
R3 2 kΩ ---
Closed loop gain setting
R4, R5 12 Ω
(see Bridge Amplifier
(1)
Design
)
--
R6, R7 1 Ω Frequency stability
1. The closed loop gain must be higher than 32 dB.
Danger of oscillation at
high frequencies with
-
inductive loads
Doc ID 1451 Rev 4 15/25
Application information TDA2005
4 Application information
Figure 25. Bridge amplifier without boostrap
Figure 26. PC board and components layout of Figure 25
16/25 Doc ID 1451 Rev 4
TDA2005 Application information
Figure 27. Low cost bridge amplifier (GV = 42dB)
Figure 28. PC board and components layout of Figure 27
Doc ID 1451 Rev 4 17/25
Application information TDA2005
Figure 29. 10 + 10 W stereo amplifier with tone balance and loudness control
Figure 30. Tone control response (circuit of Figure 29)
(dB)
+6
+3
0
-3
-6
-9
-12
10 f (Hz)10
MID
BASS
2
3
10
4
10
TREBLE
18/25 Doc ID 1451 Rev 4
TDA2005 Application information
Figure 31. 20 W bus amplifier
Figure 32. Simple 20 W two way amplifier (F
= 2 kHz)
C
Doc ID 1451 Rev 4 19/25
Application information TDA2005
Figure 33. Bridge amplifier circuit suited for low-gain applications (GV = 34 dB)
Figure 34. Example of muting circuit
4.1 Built-in protection systems
4.1.1 Load dump voltage surge
The TDA2005 has a circuit which enables it to withstand voltage pulse train, on Pin 9, of the
type shown in Figure 36. If the supply voltage peaks to more than 40 V, 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 within the limits shown.
A suggested LC network is shown in Figure 35. With this network, a train of pulses with
amplitude up to 120 V and width of 2 ms can be applied at point A. This type of protection is
ON when the supply voltage (pulse or DC) exceeds 18 V. For this reason the maximum
operating supply voltage is 18 V.
20/25 Doc ID 1451 Rev 4
TDA2005 Application information
Figure 35. Suggested LC network circuit
Figure 36. Voltage gain bridge configuration
4.1.2 Short circuit (AC and DC conditions)
The TDA2005 can withstand a permanent short-circuit on the output for a supply voltage up
to 16 V.
4.1.3 Polarity inversion
High current (up to 10 A) can be handled by the device with no damage for a longer period
than the blow-out time of a quick 2 A 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.
4.1.4 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.
4.1.5 Inductive load
A protection diode is provided to allow use of the TDA2005 with inductive loads.
4.1.6 DC voltage
The maximum operating DC voltage for the TDA2005 is 18 V. However the device can
withstand a DC voltage up to 28 V with no damage. This could occur during winter if two
batteries are series connected to crank the engine.
Doc ID 1451 Rev 4 21/25
Application information TDA2005
4.1.7 Thermal shut-down
The presence of a thermal limiting 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 happens is that P
(and therefore P
o
) and Id are reduced.
tot
The maximum allowable power dissipation depends upon the size of the external heatsink
(i.e. its thermal resistance); Figure 37 shows the power dissipation as a function of ambient
temperature for different thermal resistance.
4.1.8 Loudspeaker protection
The circuit offers loudspeaker protection during short circuit for one wire to ground.
Figure 37. Maximum allowable power dissipa-
tion vs. ambient temperature
P
(W)
20
16
12
8
tot
32
28
24
R
4
0
-50
th
= 8˚C/W
0
R
th
= 4˚C/W
R
th
= 2˚C/W
50
INFINITE HEATSINK
100 T
amb
(˚C)
Figure 39. Output power and drain current vs.
case temperature (R
P
o
(W)
8
P
o
6
I
d
= 3.2 Ω)
L
VS = 13.2V
Ω
= 3.2
R
L
f = 1 kHz
1.2
0.9
I
(A)
d
Figure 38. Output power and drain current vs.
case temperature (R
P
o
(W)
16
12
8
4
0 40 80 120 160
I
d
P
o
= 4 Ω)
L
VS = 14.4V
Ω
= 4
R
L
f = 1 kHz
I
d
(A)
1.2
0.9
0.6
0.3
(˚C)
T
case
4
2
0 40 80 120 160
0.6
0.3
T
(˚C)
case
22/25 Doc ID 1451 Rev 4
TDA2005 Package information
5 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
is an ST trademark.
Figure 40. Multiwatt11 mechanical data and package dimensions
DIM.
A50.197
B 2.65 0.104
C1.60.063
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 4.5 5 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
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
OUTLINE AND
MECHANICAL DATA
Multiwatt11 (Vertical)
0016035 H
Doc ID 1451 Rev 4 23/25
Revision history TDA2005
6 Revision history
Table 9. Document revision history
Date Revision Changes
09-Jun-1998 1 Initial release.
20-May-2000 2 Update logo.
10-Sep-2003 3 Update package drawing.
Document reformatted.
28-Jan-2010 4
Updated Features, Description and Table 1: Device summary in
cover page.
24/25 Doc ID 1451 Rev 4
TDA2005
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Doc ID 1451 Rev 4 25/25
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