This is information on a product in full production.
May 2012 Doc ID 1451 Rev 5 1/25
1
TDA2005
20 W bridge/stereo amplifier for car radio
Datasheet − production data
Features
■High output power:
–P
o = 10 + 10 W @ RL = 2 Ω, THD = 10 %
–P
o = 20 W @ RL = 4 Ω , THD = 10 %.
■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.
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).
Multiwatt11
Table 1. Device summary
Order code Package Packing
TDA2005R Multiwatt11 Tube
www.st.com
Contents TDA2005
2/25 Doc ID 1451 Rev 5
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
TDA2005 List of tables
Doc ID 1451 Rev 5 3/25
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
List of figures TDA2005
4/25 Doc ID 1451 Rev 5
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 (RL=4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. Distortion vs. output power (RL=3.2 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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, RL = 2 and 4 Ω (stereo amplifier). . . . . . . . . . . . . . . . . . 12
Figure 14. Output power vs. supply voltage, RL = 1.6 and 3.2 Ω (stereo amplifier). . . . . . . . . . . . . . . 13
Figure 15. Distortion vs. frequency, RL = 2 and 4 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 16. Distortion vs. frequency, RL = 1.6 and 3.2 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . 13
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, GV = 390/1 Ω (stereo amplifier) . . . . . . . . . . . . . 13
Figure 20. Supply voltage rejection vs. C2 and C3, GV = 1000/10 Ω (stereo amplifier) . . . . . . . . . . . 14
Figure 21. Gain vs. input sensitivity RL = 4 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 22. Gain vs. input sensitivity RL = 2 Ω (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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 = 42 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 (RL= 4 Ω) . . . . . . . . . . . . . . . . . . . 22
Figure 39. Output power and drain current vs. case temperature (RL= 3.2 Ω) . . . . . . . . . . . . . . . . . . 22
Figure 40. Multiwatt11 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TDA2005 Schematic and pins connection diagrams
Doc ID 1451 Rev 5 5/25
1 Schematic and pins connection diagrams
Figure 1. Schematic diagram
Figure 2. Pins connection diagram (top view)
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Electrical specifications TDA2005
6/25 Doc ID 1451 Rev 5
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
2.3 Bridge amplifier section
Figure 3. Test and application circuit (bridge amplifier)
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
VS
Peak supply voltage (50 ms) 40
VDC supply voltage 28
Operating supply voltage 18
Io(1)
1. The max. output current is internally limited.
Output peak current (non repetitive t = 0.1 ms) 4.5 A
Output peak current (repetitive f ≥10 Hz) 3.5
Ptot Power dissipation at Tcase = 60 °C 20 W
Tstg, TjStorage and junction temperature -40 to 150 °C
Table 3. Thermal data
Symbol Parameter Value Unit
Rth-j-case Thermal resistance junction-to-case max 3 °C/W
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TDA2005 Electrical specifications
Doc ID 1451 Rev 5 7/25
Figure 4. PC board and components layout of Figure 3
2.3.1 Electrical characteristics (bridge application)
Refer to the bridge application circuit Tamb = 25°C; Gv = 50dB; Rth(heatsink) = 4°C/W unless
otherwise specified.
Table 4. Electrical characteristics (bridge application)
Symbol Parameter Test condition Min. Typ. Max. Unit
VSSupply voltage - 8 - 18 V
Vos
Output offset voltage
(between pin 8 and pin 10)
VS = 14.4 V
VS = 13.2 V --
150
150
mV
mV
IdTotal quiescent drain current VS = 14.4 V; RL = 4 Ω
VS = 13.2 V; RL = 3.2 Ω-75
70
150
150
mA
mA
PoOutput power
f = 1 kHz, THD = 10 %
VS = 14.4 V; RL = 4 Ω
VS = 14.4 V; RL = 3.2 Ω
VS = 13.2 V; RL = 3.2 Ω
18
20
17
20
22
19
-W
THD Total harmonic distortion
f = 1 kHz; VS = 14.4 V;
RL = 4 Ω; Po = 50 mW to 15 W; --1%
f = 1 kHz; VS = 13.2 V;
RL = 3.2 Ω; Po = 50m W to
13 W;
--1%
ViInput sensitivity
f = 1 kHz
RL = 4 Ω; Po = 2 W;
RL = 3.2 Ω; Po = 2 W
-9
8
-mW
RiInput resistance f = 1 kHz 70 - - kΩ
fLLow frequency roll off (-3 dB) RL = 3.2 Ω--40Hz
fHHigh frequency roll off (-3 dB) RL = 3.2 Ω20 - - KHz
Gv Closed loop voltage gain f = 1 kHz - 50 - dB
eNTotal Input noise voltage Rg = 10 Ω (1) -310μV
SVR Supply voltage rejection Vripple = 0.5 V; fripple =100 Hz
Rg = 10 kΩ; C4 = 10 μF45 55 - dB
Electrical specifications TDA2005
8/25 Doc ID 1451 Rev 5
ηEfficiency
f = 1 kHz; VS = 14.4 V;
RL = 4 Ω; Po = 20 W;
RL = 3.2 Ω; Po = 22 W
-60
60
-
%
f = 1 kHz; VS = 13.2 V;
RL = 3.2 Ω; Po = 19 W -58-
SVR Supply voltage rejection f = 100 Hz; Vripple = 0.5 V;
Rg = 10 kΩ; RL = 4 Ω30 36 - dB
Tj
Thermal shut-down junction
temperature
f = 1 kHz; VS = 14.4V;
RL = 4 Ω; Ptot = 13 W - 145 - °C
VOSH
Output voltage with one side of
the speaker shorted to ground
VS = 14.4 V; RL = 4 Ω
VS = 13.2 V; RL = 3.2 Ω--2V
1. Bandwidth filter: 22 Hz to 22 kHz.
Figure 5. Output offset voltage vs. supply
voltage
Figure 6. Distortion vs. output power
(RL=4Ω)
Figure 7. Distortion vs. output power
(RL=3.2 Ω)
Table 4. Electrical characteristics (bridge application) (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
6OS
M6
6S6
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6S6
'VD"
2,7
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D
0O7
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6S6
'VD"
2,7
FK(Z
D
0O7
TDA2005 Electrical specifications
Doc ID 1451 Rev 5 9/25
2.3.2 Bridge amplifier design
The following considerations can be useful when designing a bridge amplifier.
Where:
VCE sat = output transistors saturation voltage
VS = allowable supply voltage
RL = load impedance
Voltage and current swings are twice for a bridge amplifier in comparison with single ended
amplifier.
In other 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 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 = 14.4 V and VCE sat = 2 V, the minimum load
that can be driven by TDA2005 in bridge configuration is:
The voltage gain of the bridge configuration is given by (see Figure 36):
Table 5. Bridge amplifier design
Parameter Single ended Bridge
Vo max Peak output voltage (before clipping)
Io max Peak Output current (before clipping)
Po max RMS output power (before clipping)
1
2
---Vs2VCEsat
–()Vs2VCEsat
–
1
2
---Vs2VCEsat
–
RL
----------------------------------- Vs2VCEsat
–
RL
-----------------------------------
1
4
---Vs2VCEsat
–()
2
2RL
------------------------------------------- Vs2VCEsat
–()
2
2RL
-------------------------------------------
RLmin
Vs2VCEsat
–
IOmax
------------------------------------14.4 4–
3.5
---------------------2.97Ω===
Gv
V0
V1
-------1R1
R2R4
⋅
R2R4
+
---------------------
⎝⎠
⎜⎟
⎛⎞
-------------------------- R3
R4
-------++==
Electrical specifications TDA2005
10/25 Doc ID 1451 Rev 5
For sufficiently high gains (40 to 50 dB) it is possible to put R2 = R4 and R3 = 2R1,
simplifying the formula in:
Figure 8. Bridge configuration
2.4 Stereo amplifier application
Figure 9. Typical stereo application circuit
Table 6. High gain vs. Rx
Gv (dB) R1 (Ω)R
2 = R4 (Ω)R
3 (Ω)
40 1000 39 2000
50 1000 12 2000
Gv4R1
R2
-------
=
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TDA2005 Electrical specifications
Doc ID 1451 Rev 5 11/25
2.4.1 Electrical characteristics (stereo application)
Refer to the stereo application circuit Tamb = 25 °C; Gv = 50 dB; Rth(heatsink) = 4°C/W unless
otherwise specified
Table 7. Electrical characteristics (stereo application)
Symbol Parameter Test condition Min. Typ. Max. Unit
VSSupply voltage 8 18 V
VoQuiescent offset voltage VS = 14.4 V
VS = 13.2 V
6.6
6
7.2
6.6
7.8
7.2
V
V
IdTotal quiescent drain current VS = 14.4 V
VS = 13.2 V -65
62
120
120
mA
mA
PoOutput power (each channel)
f = 1 kHz; THD = 10 %
VS = 14.4 V; RL = 4 Ω
VS = 14.4 V; RL = 3.2 Ω
VS = 14.4 V; RL = 2 Ω
VS = 14.4 V; RL = 1.6 Ω
6
7
9
10
6.5
8
10
11
-W
f = 1 kHz; THD = 10 %
VS = 13.2 V; RL =3.2 Ω
VS = 13.2 V; RL = 1.6 Ω
VS = 16 V; RL = 2 Ω
6
9
6.5
10
12
-W
THD Total harmonic distortion
f = 1 kHz; VS = 14.4 V;
RL = 4 Ω; Po = 50 mW to 4 W; -0.2 1%
f = 1 kHz; VS = 14.4 V;
RL = 2 Ω; Po = 50 mW to 6 W; -0.3 1%
f = 1 kHz; VS = 13.2 V;
RL = 3.2 Ω; Po = 50 mW to 3W; -0.2 1%
f = 1KHz; VS = 13.2V;
RL = 1.6Ω; Po = 40mW to 6W; -0.3 1%
CT Cross talk
VS = 14.4 V; Vo = 4 VRMS;
Rg = 5 kΩ; RL = 4 Ω;
f = 1 kHz
f = 10 kHz
-60
45
-mW
mW
ViInput saturation voltage - 300 - mW
ViInput sensitivity
f = 1 kHz; Po = 1W;
RL = 4 Ω;
RL = 3.2Ω;
-6
5.5
-mV
mV
RiInput resistance f = 1 kHz 70 200 - kΩ
fLLow frequency roll off (-3 dB) RL = 2 Ω--50Hz
fHHigh frequency roll off (-3 dB) RL = 2 Ω15 - - kHz
Gv
Open loop voltage gain f = 1 kHz - 90 - dB
Closed loop voltage gain f = 1 kHz 48 50 51
Electrical specifications TDA2005
12/25 Doc ID 1451 Rev 5
ΔGv Closed loop gain matching - - 0.5 - dB
eNTotal input noise voltage Rg = 10 kΩ(1) -1.55μV
SVR Supply voltage rejection Vripple = 0.5 V; fripple =100 Hz
Rg = 10 kΩ; C3 = 10 μF; 35 45 - dB
ηEfficiency
f = 1 kHz; VS = 14.4 V;
RL = 4 Ω; Po = 6.5 W;
RL = 2Ω; Po = 10 W;
-70
60
-%
f = 1 kHz; VS = 13.2 V;
RL = 3.2 Ω; Po = 6.5 W;
RL = 1.6 Ω; Po = 100 W;
-70
60
-%
1. Bandwidth filter: 22 Hz to 22 kHz.
Figure 10. Quiescent output voltage vs.
supply voltage (stereo amplifier)
Figure 11. Quiescent drain current vs. supply
voltage (stereo amplifier)
Figure 12. Distortion vs. output power (stereo
amplifier)
Figure 13. Output power vs. supply voltage,
RL = 2 and 4 Ω (stereo amplifier)
Table 7. Electrical characteristics (stereo application) (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
'!0'03
6O
6
6S6
'!0'03
)D
M!
6S6
'!0'03
D
0O7
FK(Z
'VD"
6S62,7
6S62,7
6S62,7
6S62,7
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6S6
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FK(Z
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D 2,7
2,7
TDA2005 Electrical specifications
Doc ID 1451 Rev 5 13/25
Figure 14. Output power vs. supply voltage,
RL = 1.6 and 3.2 Ω (stereo amplifier)
Figure 15. Distortion vs. frequency, RL = 2 and
4 Ω (stereo amplifier)
Figure 16. Distortion vs. frequency, RL = 1.6
and 3.2 Ω (stereo amplifier)
Figure 17. Supply voltage rejection vs. C3
(stereo amplifier)
Figure 18. Supply voltage rejection vs.
frequency (stereo amplifier)
Figure 19. Supply voltage rejection vs. C2 and
C3, GV = 390/1 Ω (stereo amplifier)
'!0'03
6S6
0O
7
FK(Z
'VD"
D
2,7
2,7
'!0'03
D
F(Z
6S6
'VD"
0O7
2,7
0O7
2,7
'!0'03
D
F(Z
6S6
'VD"
0O7
2,7
0O7
2,7
'!0'03
362
D"
#&
6S6
FRIPPLEK(Z
6RIPPLE6
'VD"
2GK7
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362
D"
F(Z
2G
2GK7
6S6
'VD"
#&
'!0'03
362
D"
#&
6S6
2,7
2GK7
'V7
FRIPPLE(Z
#&
#&
#&
Electrical specifications TDA2005
14/25 Doc ID 1451 Rev 5
Figure 20. Supply voltage rejection vs. C2 and
C3, G
V
= 1000/10
Ω
(stereo amplifier)
Figure 21. Gain vs. input sensitivity RL = 4 Ω
(stereo amplifier)
Figure 22. Gain vs. input sensitivity RL = 2 Ω
(stereo amplifier)
Figure 23. Total power dissipation and
efficiency vs. output power (bridge)
Figure 24. Total power dissipation and
efficiency vs. output power (stereo)
'!0'03
362
D"
#&
6S6
2,7
2GK7
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TDA2005 Application suggestion
Doc ID 1451 Rev 5 15/25
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 - -
C2 2.2 μFOptimization of turn on
Pop and turn on Delay High turn on delay
High Turn on Pop, Higher
low frequency cutoff
Increase of Noise
C3 0.1 μF Supply bypass - Danger of oscillation
C4 10 μF Ripple rejection
Increase of SVR,
Increase of the Switch-
on Time
Degradation of SVR
C5, C7 100 μF Bootstrapping - Increase of distortion at
low frequency
C6, C8 220 μF
Feedback input DC
decoupling, low
frequency cut-off
-
Danger of oscillation at
high frequencies with
inductive loads
C9, C10 0.1 μF Frequency stability - Danger of oscillation
R1 120 kΩOptimization of the
output symmetry Smaller Pomax Smaller Pomax
R2 1 kΩ---
R3 2 kΩ---
R4, R5 12 Ω
Closed loop gain setting
(see Bridge Amplifier
Design(1))
--
R6, R7 1 ΩFrequency stability
Danger of oscillation at
high frequencies with
inductive loads
-
1. The closed loop gain must be higher than 32 dB.
Application information TDA2005
16/25 Doc ID 1451 Rev 5
4 Application information
Figure 25. Bridge amplifier without boostrap
Figure 26. PC board and components layout of Figure 25
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TDA2005 Application information
Doc ID 1451 Rev 5 17/25
Figure 27. Low cost bridge amplifier (GV = 42 dB)
Figure 28. PC board and components layout of Figure 27
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18/25 Doc ID 1451 Rev 5
Figure 29. 10 + 10 W stereo amplifier with tone balance and loudness control
Figure 30. Tone control response (circuit of Figure 29)
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Figure 31. 20 W bus amplifier
Figure 32. Simple 20 W two way amplifier (FC = 2 kHz)
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Application information TDA2005
20/25 Doc ID 1451 Rev 5
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.
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TDA2005 Application information
Doc ID 1451 Rev 5 21/25
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.
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Application information TDA2005
22/25 Doc ID 1451 Rev 5
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 Po (and therefore Ptot) and Id are reduced.
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
Figure 38. Output power and drain current vs.
case temperature (RL= 4 Ω)
Figure 39. Output power and drain current vs.
case temperature (RL= 3.2 Ω)
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TDA2005 Package information
Doc ID 1451 Rev 5 23/25
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
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Revision history TDA2005
24/25 Doc ID 1451 Rev 5
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.
28-Jan-2010 4
Document reformatted.
Updated Features, Description and Table 1: Device summary in
cover page.
02-May-2012 5 Updated Table 1: Device summary on page 1.
TDA2005
Doc ID 1451 Rev 5 25/25
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