STMicroelectronics TDA7375AV Datasheet
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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 %
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 V
S
short
– Soft short at turn-on
– Thermal shutdown proximity
Protections:
– Output AC/DC short circuit: to GND, to V
S and across the load
– Soft short at turn-on
– Overrating chip temperature with soft thermal limiter
– Load dump voltage surge
Table 1.
Device summary
Order code
E-TDA7375AV
Package
Multiwat15
'!0'03
Multiwatt15
– Very inductive loads
– Fortuitous open GND
– Reversed battery
– ESD
Description
The TDA7375AV is a technology class AB car radio amplifier able to work either in dual bridge or quad single ended configuration.
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
.
Packing
Tube
September 2013 Doc ID 6325 Rev 5 1/20 www.st.com
1
Contents
Contents
TDA7375AV
Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Standard test and application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Easy single ended to bridge transition . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gain internally fixed to 20 dB in single ended, 26 dB in bridge . . . . . . . . 13
Silent turn on/off and muting/standby function . . . . . . . . . . . . . . . . . . . . . 13
Rail-to-rail output voltage swing with no need of bootstrap capacitors . 14
Absolute stability without any external compensation . . . . . . . . . . . . . . 14
Handling of the diagnostics information . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/20 Doc ID 6325 Rev 5
TDA7375AV
List of tables
List of tables
Table 5.
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Doc ID 6325 Rev 5 3/20
List of figures
List of figures
TDA7375AV
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
4/20 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
2.1 Absolute maximum ratings
Table 2.
Symbol
V op
V
S
V peak
I
O
I
O
P tot
T stg
, T j
Absolute maximum ratings
Parameter
Operating supply voltage
DC supply voltage
Peak supply voltage (for t = 50 ms)
Output peak current (not repetitive t = 100
s)
Output peak current (repetitive f > 10 Hz)
Power dissipation (T case
= 85 °C)
Storage and junction temperature
Value
18
28
40
4.5
3.5
36
-40 to 150
Unit
A
A
W
C
V
V
V
Table 3.
Symbol
Thermal data
Parameter
R th j-case
Thermal resistance junction-to-case max
Value
1.8
Unit
°C/W
Refer to the test circuit, V
S
= 14.4V; R
L specified.
= 4
; f = 1kHz; T amb
= 25°C, unless otherwise
Table 4.
Symbol
Electrical characteristics
Parameter
V
S
I d
V
OS
P
O
P
O
max
P
O EIAJ
THD
Test condition
Supply voltage range -
Total quiescent drain current R
L
=
Output offset voltage -
Output power
Max. output power
Distortion
(1)
THD = 10 %; R
L
= 4
Bridge
Single Ended
Single Ended, R
L
= 2
V
S
= 14.4 V, Bridge
V
S
= 13.7 V, Bridge
R
L
= 4
Single Ended, P
O
= 0.1 to 4 W
Bridge, P
O
= 0.1 to 10 W
Min.
Typ.
Max.
Unit
8
-
-
-
-
-
18
150
150
V mA mV
23
6.5
37
33
-
25
7
12
43
37
0.02
0.03
-
-
0.3
%
%
W
W
W
W
W
6/20 Doc ID 6325 Rev 5
TDA7375AV Electrical specification
Table 4.
Symbol
Electrical characteristics (continued)
Parameter Test condition
C
R
G
G
E
T
IN
V
V
IN
SVR
I
A
SB
I
SB
V
SB
V
SB pin7
Cross talk f = 1 kHz Single ended f = 10 kHz Single ended f = 1 kHz Bridge f = 10 kHz Bridge
Single Ended
Input impedance
Bridge
Single Ended
Voltage gain
-
Bridge
Voltage gain match
R g
= 0; ”A” weighted, S.E.
Non inverting channels
Inverting channels
Input noise voltage
Supply voltage rejection
Bridge
R g
= 0; 22 Hz to 22 kHz
R g
= 0; f = 300 Hz
Standby attenuation
Standby current consumption V
St-by
= 0 to 1.5 V
Standby In threshold voltage
P
O
= 1 W
Standby Out threshold voltage
Standby pin current
Play mode V pin7
= 5 V
Max. driving current under fault
(2)
I cd off
Clipping detector output average current d = 1%
(3)
I cd on
Clipping detector output average current d = 5%
V sat pin10
Voltage saturation on pin 10
1.
Saturated square wave output.
2.
See built-in S/C protection description
3.
Pin 10 pulled-up to 5 V with 10 k
; R
L
= 4
Sink current at Pin 10 = 1 mA
Min.
Typ.
Max.
Unit
-
20
10
19
-
-
55
25
-
70
60
-
60
30
15
20
26
-
-
-
-
-
-
-
21
27
0.5
dB dB dB dB k
k
dB dB dB
-
-
50
80
-
-
3.5
-
-
-
-
-
2
5
3.5
-
90
-
-
-
-
-
90
160
-
-
-
100
1.5
-
50
5
-
-
-
-
0.7
V
V
A
V
V dB dB
A
V
V
A mA
A
Doc ID 6325 Rev 5 7/20
Standard test and application circuits
3 Standard test and application circuits
Figure 3.
Quad stereo circuit
Note:
The output decoupling capacitors
(C9,C10,C11,C12) could be reduced to 1000
F if the 2
operation is not required.
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TDA7375AV
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Figure 4.
Double bridge circuit
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Figure 5.
Stereo/bridge circuit
+
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8/20 Doc ID 6325 Rev 5
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
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.)
Figure 21. Total power dissipation and efficiency vs. output power (BTL)
12/20 Doc ID 6325 Rev 5
TDA7375AV Functional description
4.1
4.2
4.3
4.4
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.
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.
Gain internally fixed to 20 dB in single ended, 26 dB in bridge
Advantages of this design choice are in terms of:
●
● 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 = 1
A 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.
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
4.5.2
TDA7375AV
Rail-to-rail output voltage swing with no need of bootstrap capacitors
The output swing is limited only by the V
CEsat
of the output transistors, which is in the range of 0.3
(R sat
) 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.
Absolute stability without any external compensation
Referring to the circuit of Figure 22 the gain V
Out
/V
In
is greater than unity, approximately
1+R2/R1. The DC output (V
CC
/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
14/20
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 V
S
, 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
). Supposing that the output
Doc ID 6325 Rev 5
TDA7375AV Functional description capacitor C out
for any reason is shorted, the loudspeaker will not be damaged being this soft short circuit condition revealed.
Figure 23.
Single ended configuration
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 V
S
– 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.
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
Figure 25.
Output fault waveforms (see Figure 26 )
TDA7375AV
4.7
Figure 26.
Fault waveforms
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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
Figure 27.
Waveforms
34"90).
6/,4!'%
Functional description
T
6S
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T
6PIN
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T
4(%2-!,
02/8)-)49
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Figure 28.
Interface circuitry to differentiate the information schematic
Doc ID 6325 Rev 5 17/20
Package information TDA7375AV
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
$)-
MM INCH
-).
490 -!8
-).
490 -!8
,
,
,
-
-
3
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18/20 Doc ID 6325 Rev 5
*
'!0'03
TDA7375AV
Table 5.
Date
Document revision history
15-Mar-2005
24-Jul-2008
05-Dec-2008
13-Feb-2012
16-Sep-2013
Revision
4
5
1
2
3
Changes
Initial release.
Removed the package Multiwatt 15 horizontal.
Document reformatted.
Updated
Section 5: Package information
.
Updated
Table 1: Device summary on page 1
.
Updated Disclaimer.
Revision history
Doc ID 6325 Rev 5 19/20
TDA7375AV
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