TDA7375AV
2 x 37 W dual/quad power amplifier for car radio
Features
■
High output power capability
– 2 x 43 W max./4
– 2 x 37 W/4 EIAJ
– 2 x 26 W/4 @14.4 V, 1 kHz, 10 %
– 4 x 7 W/4 @14.4 V, 1 kHz, 10 %
– 4 x 12 W/2 @14.4 V, 1 kHz, 10 %
'!0'03
Multiwatt15
■
Minimum external components count:
– No bootstrap capacitors
– No Boucherot cells
– Internally fixed gain (26 dB BTL)
– Standby function (CMOS compatible)
■
No audible pop during standby operations
■
Diagnostics facility for:
– Clipping
– Out to GND short
– Out to VS short
– Soft short at turn-on
– Thermal shutdown proximity
■
–
–
–
–
Description
The TDA7375AV is a technology class AB car
radio amplifier able to work either in dual bridge or
quad single ended configuration.
Protections:
– Output AC/DC short circuit: to GND, to VS
and across the load
– Soft short at turn-on
– Overrating chip temperature with soft
thermal limiter
– Load dump voltage surge
Table 1.
Very inductive loads
Fortuitous open GND
Reversed battery
ESD
The exclusive fully complementary structure of
the output stage and the internally fixed gain
guarantee the highest possible power
performances with extremely reduced component
count.
The on-board clip detector simplifies gain
compression operation. The fault diagnostics
makes it possible to detect mistakes during car
radio set assembly and wiring in the car.
Device summary
Order code
Package
Packing
E-TDA7375AV
Multiwat15
Tube
September 2013
Doc ID 6325 Rev 5
1/20
www.st.com
1
Contents
TDA7375AV
Contents
1
Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Standard test and application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1
High application flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2
Easy single ended to bridge transition . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3
Gain internally fixed to 20 dB in single ended, 26 dB in bridge . . . . . . . . 13
4.4
Silent turn on/off and muting/standby function . . . . . . . . . . . . . . . . . . . . . 13
4.5
Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.6
4.7
4.5.1
Rail-to-rail output voltage swing with no need of bootstrap capacitors . 14
4.5.2
Absolute stability without any external compensation . . . . . . . . . . . . . . 14
Built–in short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.6.1
Diagnostics facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.2
Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Handling of the diagnostics information . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
Doc ID 6325 Rev 5
TDA7375AV
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Doc ID 6325 Rev 5
3/20
List of figures
TDA7375AV
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
4/20
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Quad stereo circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Double bridge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Stereo/bridge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PCB and component layout of the Figure 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PCB and component layout of the Figure 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Quiescent drain current vs. supply voltage (Single ended and bridge). . . . . . . . . . . . . . . . 10
Quiescent output voltage vs. supply voltage (Single ended and bridge) . . . . . . . . . . . . . . 10
Output power vs. supply voltage (2 , S.E.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output power vs. supply voltage (4 , S.E.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output power vs. supply voltage (4 , BTL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Distortion vs. output power (2 , S.E.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Distortion vs. output power (4 , S.E.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Distortion vs. output power (4 , BTL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Supply voltage rejection vs. frequency (BTL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Supply voltage rejection vs. frequency (S.E.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Standby attenuation vs. threshold voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Total power dissipation and efficiency vs. output power (S.E.). . . . . . . . . . . . . . . . . . . . . . 12
Total power dissipation and efficiency vs. output power (BTL). . . . . . . . . . . . . . . . . . . . . . 12
The new output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Single ended configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Clipping detection waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output fault waveforms (see Figure 26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Fault waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Interface circuitry to differentiate the information schematic. . . . . . . . . . . . . . . . . . . . . . . . 17
Multiwatt 15 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Doc ID 6325 Rev 5
TDA7375AV
1
Block and pin connection diagrams
Block and pin connection diagrams
Figure 1.
Block diagram
Figure 2.
Pin connection (top view)
Doc ID 6325 Rev 5
5/20
Electrical specification
TDA7375AV
2
Electrical specification
2.1
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Unit
Vop
Operating supply voltage
18
V
VS
DC supply voltage
28
V
Peak supply voltage (for t = 50 ms)
40
V
IO
Output peak current (not repetitive t = 100 s)
4.5
A
IO
Output peak current (repetitive f > 10 Hz)
3.5
A
Ptot
Power dissipation (Tcase = 85 °C)
36
W
Tstg, Tj
Storage and junction temperature
-40 to 150
C
Vpeak
2.2
Value
Thermal data
Table 3.
Thermal data
Symbol
Parameter
Rth j-case
2.3
Thermal resistance junction-to-case
max
Value
Unit
1.8
°C/W
Electrical characteristics
Refer to the test circuit, VS = 14.4V; RL = 4; f = 1kHz; Tamb = 25°C, unless otherwise
specified.
Table 4.
Symbol
Electrical characteristics
Parameter
Test condition
Min.
Typ.
Max.
Unit
VS
Supply voltage range
-
8
-
18
V
Id
Total quiescent drain current
RL =
-
-
150
mA
Output offset voltage
-
-
-
150
mV
Output power
THD = 10 %; RL = 4
Bridge
Single Ended
Single Ended, RL = 2
23
6.5
25
7
12
PO max
Max. output power(1)
VS = 14.4 V, Bridge
37
43
W
PO EIAJ
power(1)
VS = 13.7 V, Bridge
33
37
W
-
0.02
0.03
VOS
PO
THD
6/20
EIAJ output
Distortion
RL = 4
Single Ended, PO = 0.1 to 4 W
Bridge, PO = 0.1 to 10 W
Doc ID 6325 Rev 5
-
0.3
W
W
W
%
%
TDA7375AV
Table 4.
Symbol
CT
Electrical specification
Electrical characteristics (continued)
Parameter
Test condition
Min.
Typ.
Max.
Unit
f = 1 kHz Single ended
-
70
-
dB
f = 10 kHz Single ended
-
60
-
dB
f = 1 kHz Bridge
55
-
-
dB
f = 10 kHz Bridge
-
60
-
dB
Single Ended
20
30
-
k
Bridge
10
15
-
k
Single Ended
19
20
21
dB
Bridge
25
26
27
dB
Cross talk
RIN
Input impedance
GV
Voltage gain
GV
Voltage gain match
-
-
-
0.5
dB
-
2
5
-
Input noise voltage
Rg = 0; ”A” weighted, S.E.
Non inverting channels
Inverting channels
V
V
Bridge
Rg = 0; 22 Hz to 22 kHz
-
-
V
EIN
3.5
SVR
Supply voltage rejection
Rg = 0; f = 300 Hz
50
-
-
dB
ASB
Standby attenuation
PO = 1 W
80
90
-
dB
ISB
Standby current consumption
VSt-by = 0 to 1.5 V
-
-
100
A
VSB
Standby In threshold voltage
-
-
1.5
V
VSB
Standby Out threshold voltage
3.5
-
-
V
-
-
50
A
Ipin7
Standby pin current
-
-
5
mA
Play mode Vpin7 = 5 V
Max. driving current under fault
(2)
off
Clipping detector output
average current
d = 1% (3)
-
90
-
A
Icd on
Clipping detector output
average current
d = 5%(3)
-
160
-
A
Voltage saturation on pin 10
Sink current at Pin 10 = 1 mA
-
-
0.7
V
Icd
Vsat pin10
1. Saturated square wave output.
2. See built-in S/C protection description
3. Pin 10 pulled-up to 5 V with 10 k; RL = 4
Doc ID 6325 Rev 5
7/20
Standard test and application circuits
3
TDA7375AV
Standard test and application circuits
Figure 3.
Quad stereo circuit
+2
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(C9,C10,C11,C12) could be reduced
to 1000F if the 2 operation is not
required.
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Figure 4.
Double bridge circuit
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Stereo/bridge circuit
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8/20
Doc ID 6325 Rev 5
'!0'03
TDA7375AV
Standard test and application circuits
Figure 6.
PCB and component layout of the Figure 3
Figure 7.
PCB and component layout of the Figure 4
Doc ID 6325 Rev 5
9/20
Standard test and application circuits
TDA7375AV
3.1
Electrical characteristics curves
Figure 8.
Quiescent drain current vs. supply
voltage (Single ended and bridge)
Figure 9.
Quiescent output voltage vs. supply
voltage (Single ended and bridge)
Figure 10. Output power vs. supply voltage (2,
S.E.)
Figure 11. Output power vs. supply voltage (4,
S.E.)
Figure 12. Output power vs. supply voltage (4,
BTL)
Figure 13. Distortion vs. output power (2,
S.E.)
10/20
Doc ID 6325 Rev 5
TDA7375AV
Standard test and application circuits
Figure 14. Distortion vs. output power (4,
S.E.)
Figure 15. Distortion vs. output power (4,
BTL)
Figure 16. Crosstalk vs. frequency
Figure 17. Supply voltage rejection vs.
frequency (BTL)
Figure 18. Supply voltage rejection vs.
frequency (S.E.)
Figure 19. Standby attenuation vs. threshold
voltage
Doc ID 6325 Rev 5
11/20
Standard test and application circuits
TDA7375AV
Figure 20. Total power dissipation and
efficiency vs. output power (S.E.)
12/20
Figure 21. Total power dissipation and
efficiency vs. output power (BTL)
Doc ID 6325 Rev 5
TDA7375AV
Functional description
4
Functional description
4.1
High application flexibility
The availability of 4 independent channels makes it possible to accomplish several kinds of
applications ranging from 4 speakers stereo (F/R) to 2 speakers bridge solutions.
In case of working in single ended conditions the polarity of the speakers driven by the
inverting amplifier must be reversed respect to those driven by non inverting channels. This
is to avoid phase inconveniences causing sound alterations especially during the
reproduction of low frequencies.
4.2
Easy single ended to bridge transition
The change from single ended to bridge configurations is made simply by means of a short
circuit across the inputs, that is no need of further external components.
4.3
Gain internally fixed to 20 dB in single ended, 26 dB in bridge
Advantages of this design choice are in terms of:
4.4
●
components and space saving
●
output noise, supply voltage rejection and distortion optimization
Silent turn on/off and muting/standby function
The standby can be easily activated by means of a CMOS level applied to pin 7 through a
RC filter.
Under standby conditions the device is turned off completely (supply current = 1A typ.;
output attenuation = 80 dB min.). Every ON/OFF operation is virtually pop free.
Furthermore, at turn-on the device stays in muting conditions for a time determined by the
value assigned to the SVR capacitor.
While in muting the device outputs become insensitive to any kind of signal that may be
present at the input terminals. In other words every transient coming from previous stages
doesn't produce unpleasant acoustic effects to the speakers.
4.5
Output stage
The fully complementary output stage was made possible by the development of a new
component: the ST exclusive power ICV PNP.
A novel design based upon the connection shown in Figure 22 has then allowed the full
exploitation of its possibilities. The clear advantages that this new approach has over
classical output stages are described below.
Doc ID 6325 Rev 5
13/20
Functional description
4.5.1
TDA7375AV
Rail-to-rail output voltage swing with no need of bootstrap capacitors
The output swing is limited only by the VCEsat of the output transistors, which is in the range
of 0.3 (Rsat) each. Classical solutions adopting composite PNP-NPN for the upper output
stage have higher saturation loss on the top side of the waveform.
This unbalanced saturation causes a significant power reduction. The only way to recover
power consists of the addition of expensive bootstrap capacitors.
4.5.2
Absolute stability without any external compensation
Referring to the circuit of Figure 22 the gain VOut/VIn is greater than unity, approximately
1+R2/R1. The DC output (VCC/2) is fixed by an auxiliary amplifier common to all the
channels.
By controlling the amount of this local feedback it is possible to force the loop gain (A*) to
less than unity at frequency for which the phase shift is 180°. This means that the output
buffer is intrinsically stable and not prone to oscillation.
Most remarkably, the above feature has been achieved in spite of the very low closed loop
gain of the amplifier. In contrast, with the classical PNP-NPN stage, the solution adopted for
reducing the gain at high frequencies makes use of external RC networks, namely the
Boucherot cells.
4.6
Built–in short circuit protection
Figure 22. The new output stage
Reliable and safe operation, in presence of all kinds of short circuit involving the outputs is
assured by BUILT-IN protectors. Additionally to the AC/DC short circuit to GND, to VS,
across the speaker, a SOFT SHORT condition is signalled out during the TURN-ON PHASE
so assuring correct operation for the device itself and for the loudspeaker.
This particular kind of protection acts in a way to avoid that the device is turned on (by
Standby) when a resistive path (less than 16 ohms) is present between the output and GND.
As the involved circuitry is normally disabled when a current higher than 5 mA is flowing into
the ST-BY pin, it is important, in order not to disable it, to have the external current source
driving the ST-BY pin limited to 5 mA.
This extra function becomes particularly attractive when, in the single ended configuration,
one capacitor is shared between two outputs (see Figure 23). Supposing that the output
14/20
Doc ID 6325 Rev 5
TDA7375AV
Functional description
capacitor Cout for any reason is shorted, the loudspeaker will not be damaged being this soft
short circuit condition revealed.
Figure 23. Single ended configuration
4.6.1
Diagnostics facility
The TDA7375AV is equipped with a diagnostic circuitry able to detect the following events:
●
Clipping in the output signal
●
Thermal shutdown
●
Output fault
–
short to GND
–
short to VS
–
soft short at turn on
The information is available across an open collector output (pin 10) through a current
sinking when the event is detected. A current sinking at pin 10 is triggered when a certain
distortion level is reached at any of the outputs. This function allows gain compression
possibility whenever the amplifier is over driven.
4.6.2
Thermal shutdown
In this case the output 10 will signal the proximity of the junction temperature to the
shutdown threshold. Typically current sinking at pin 10 will start ~10 °C before the shutdown
threshold is reached.
Figure 24. Clipping detection waveforms
Doc ID 6325 Rev 5
15/20
Functional description
TDA7375AV
Figure 25. Output fault waveforms (see Figure 26)
Figure 26. Fault waveforms
34
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Handling of the diagnostics information
As various kinds of information are available at the same pin (clipping detection, output fault,
thermal proximity), this signal must be handled properly in order to discriminate each event.
This could be done by taking into account the different timing of the diagnostic output during
each case.
Normally the clip detector signalling produces a low level at pin 10 that is shorter referred to
every kind of fault detection; based on this assumption an interface circuitry to differentiate
the information is represented in the following schematic.
16/20
Doc ID 6325 Rev 5
TDA7375AV
Functional description
Figure 27. Waveforms
34
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T
6S
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7!6%&/2T
6PIN
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3(/244/'.$
/24/6S
4(%2-!,
02/8)-)49
'!0'03
Figure 28. Interface circuitry to differentiate the information schematic
Doc ID 6325 Rev 5
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Package information
5
TDA7375AV
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 29. Multiwatt 15 mechanical data and package dimensions
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18/20
Doc ID 6325 Rev 5
TDA7375AV
6
Revision history
Revision history
Table 5.
Document revision history
Date
Revision
Changes
15-Mar-2005
1
Initial release.
24-Jul-2008
2
Removed the package Multiwatt 15 horizontal.
05-Dec-2008
3
Document reformatted.
Updated Section 5: Package information.
13-Feb-2012
4
Updated Table 1: Device summary on page 1.
16-Sep-2013
5
Updated Disclaimer.
Doc ID 6325 Rev 5
19/20
TDA7375AV
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
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