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TDA7375V
Fi
2 x 35W dual/quad power amplifier for car radio
1FEATURES
■ HIGH OUTPUT POWER CAPABILITY:
– 2 x 40W max./4Ω
–2 x 35W/4Ω EIAJ
–2 x 35W/4Ω EIAJ
–2 x 25W/4Ω @14.4V, 1KHz, 10%
–4 x 7W/4Ω @14.4V,1KHz, 10%
–4 x 12W/2Ω @14.4V, 1KHz, 10%
■ MINIMUM EXTERNAL COMPONENTS
COUNT:
– NO BOOTSTRAP CAPACITORS
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN (26dB BTL)
■ ST-BY FUNCTION (CMOS COMPATIBLE)
■ NO AUDIBLE POP DURING ST-BY
OPERATIONS
■ DIAGNOSTICS FACILITY FOR:
– CLIPPING
– OUT TO GND SHORT
–OUT TO V
– SOFT SHORT AT TURN-ON
– THERMAL SHUTDOWN PROXIMITY
SHORT
S
gure 1. Package
MULTIWATT15
Table 1. Order Codes
Part Number Package
TDA7375V MULTIWATT 15 (Vertical)
2 PROTECTIONS:
■ OUPUT AC/DC SHORT CIRCUIT
– TO GND
–TO V
– ACROSS THE LOAD
■ SOFT SHORT AT TURN-ON
■ OVERRATING CHIP TEMPERATURE WITH
■ SOFT THERMAL LIMITER
■ LOAD DUMP VOLTAGESURGE
■ VERY INDUCTIVE LOADS
■ FORTUITOUS OPEN GND
■ REVERSED BATTERY
■ ESD
S
Figure 2. Block Diagram
July 2008
Rev. 4
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TDA7375V
3DESCRIPTION
The TDA7375V is a new 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 guarantees
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.
Table 2. Absolute Maximum Ratings
Symbol Parameter Value Unit
V
op
V
S
V
peak
I
O
I
O
P
tot
T
, T
stg
Operating Supply Voltage 18 V
DC Supply Voltage 28 V
Peak Supply Voltage (for t = 50ms) 50 V
Output Peak Current (not repetitive t = 100μs) 4.5 A
Output Peak Current (repetitive f > 10Hz) 3.5 A
Power Dissipation (T
Storage and Junction Temperature -40 to 150 °C
j
= 85°C) 36 W
case
Table 3. Thermal Data
Symbol Parameter Value Unit
R
th j-case
Thermal Resistance Junction-case max 1.8 °C/W
Figure 3. Pin Connection (Top view)
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TDA7375V
Table 4. Electrical Characteristcs (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz; T
amb
unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
d
V
OS
P
O
max Max. Output Power (***) VS = 14.4V, Bridge 36 40 W
P
O
P
O EIAJ
THD Distortion R
CT Cross Talk f = 1KHz Single Ended 70 dB
R
IN
G
V
G
V
E
IN
SVR Supply Voltage Rejection
A
SB
I
SB
V
SB
V
SB
I
pin7
I
cd off
Icd on
V
sat pin10
(*) See built-in S/C protection de scription
(**) Pin 10 Pulled-up to 5V with 10KΩ; R
(***) Saturated square wave output.
Supply Voltage Range 8 18 V
Total Quiescent Drain Current
R
= ∞
L
150 mA
Output Offset Voltage 150 mV
Output Power THD = 10%; RL = 4Ω
Bridge
Single Ended
Single Ended, R
= 2Ω
L
23
6.5
25
7
12
EIAJ Output Power (***) VS = 13.7V, Bridge 32 35 W
= 4Ω
L
Single Ended, PO = 0.1 to 4W
Bridge, PO = 0.1 to 10W
0.02
0.03 0.3
f = 10KHz Single Ended 60 dB
f = 1KHz Bridge 55 dB
f = 10KHz Bridge 60 dB
Input Impedance Single Ended 20 30 KΩ
Bridge 10 15 KΩ
Voltage Gain Single Ended 19 20 21 dB
Bridge 25 26 27 dB
Voltage Gain Match 0.5 dB
Input Noise Voltage Rg = 0; ”A” weighted, S.E.
Non Inverting Channels
Inverting Channels
2
5
Bridge
Rg = 0; 22Hz to 22KHz 3.5 μV
= 0; f = 300Hz
R
g
50 dB
Stand-by Attenuation PO = 1W 80 90 dB
ST-BY Current Consumption V
= 0 to 1.5V 100 μA
ST-BY
ST-BY In Threshold Voltage 1.5 V
ST-BY Out Threshold Voltage 3.5 V
ST-BY Pin Current Play Mode V
= 5V 50 μA
pin7
Max Driving Curr. Under Fault (*) 5 mA
Clipping Detector Output
d = 1% (**) 90 μA
Average Current
Clipping Detector Output
d = 5% (**) 160 μA
Average Current
Voltage Saturation on pin 10 Sink Current at Pin 10 = 1mA 0.7 V
= 4Ω
L
= 25°C,
W
W
W
%
%
μV
μV
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TDA7375V
4 STANDARD TEST AND APPLICATION CIRCUIT
Figure 4. Quad Stereo
Note:
C9, C10, C11, C12 could be reduced
if the 2W operation is not required.
Figure 5. Double Bridge
ST-BY
IN L
IN R
10K R1
C1 0.47μF
C2 0.47μF
C8 47μF
ST-BY
10K R1
C7
10μF
IN FL
C1 0.22μF
IN FR 5
C2 0.22μF
IN RL
C4 0.22μF
IN RR 11
C3 0.22μF
C8 47μF
C5
10μF
13
7
4
5
12
11
6
89
13
7
4
12
6
89
C4
100nF
3
1
2
15
14
10
DIAGNOSTICS
C6
100nF
3
1
2
15
14
10
DIAGNOSTICS
OUT L
OUT R
D94AU064A
C10 2200μF
C9 2200μF
C11 2200μF
C12 2200μF
D94AU063A
V
S
C3
1000μF
V
C5
1000μF
S
OUT FL
OUT FR
OUT RL
OUT RR
Figure 6. Stereo/Bridge
IN BRIDGE 12
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ST-BY
IN L
IN L
10K
0.22μF
0.22μF
0.47μF
47μF
10μF
7
4
5
11
6
89
3
13
DIAGNOSTICS
10
15
14
V
S
1000μF100nF
1
2200μF
2
2200μF
OUT L
OUT R
OUT
BRIDGE
D94AU065A
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Figure 7. P.C. Board and Component Layout of the fig.4
TDA7375V
Figure 8. P.C. Board and Component Layout of the fig.5
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Figure 9. Quiescent Drain Current vs. Supply
Voltage (Single Ended and Bridge).
Figure 10. Quiescent Output Voltage vs.
Supply Voltage (Single Ended and
Bridge).
Figure 12. Output Power vs. Supply Voltage
Figure 13. OutputPower vs. Supply Voltage
Figure 11. Output Power vs. Supply Voltage
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Figure 14. Distortion vs. Output Power
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TDA7375V
Figure 15. Distortion vs. Output Power
Figure 16. Distortion vs. Output Power
Figure 18. Supply Voltage Rejection vs.
Frequency
Figure 19. Supply Voltage Rejection vs.
Frequency
Figure 17. Cross-talk vs. Frequency
Figure 20. Stand-by Attenuation vs. Threshold
Voltage
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TDA7375V
Figure 21. Total Power Dissipation and
Efficiency vs. Output Power
Figure 22. Total Power Dissipation and
Efficiency vs. Output Power
5 GENERAL STRUCTURE
5.1 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.
5.2 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.
5.3 Gain Internally Fixed to 20dB in Single Ended, 26dB in Bridge
Advantages of this design choice are in terms of:
■ componentsand space saving
■ output noise, supply voltage rejection and distortion optimization.
5.4 Silent Turn On/Off and Muting/Stand-by Function
The stand-by can be easily activated by means of a CMOS level applied to pin 7 through a RC filter.
Under stand-by condition the device is turned off completely (supply current = 1μA typ.; output attenuation
= 80dB min.). Every ON/OFF operation is virtually pop free. Furthemore, at turn-on the device stays in
muting condition for a time determined by the value assigned to the SVR capacitor.
While in muting the device outputs becomes insensitive to any kinds of signal that may be present at the
input terminals. In other words every transient coming from previous stages produces no unplesantacoustic effect to the speakers.
5.5 STAND-BY DRIVING (pin 7)
Some precautions have to be taken in the definition of stand-by driving networks: pin 7 cannot be directly
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TDA7375V
driven by a voltage source whose current capability is higher than 5mA. In practical cases a series resistance has always to be inserted, having it the double purpose of limiting the current at pin 7 and to smooth
down the stand-by ON/OFF transitions - in combination with a capacitor - for output pop prevention.
In any case, a capacitor of at least 100nF from pin 7 to S-GND, with no resistance in between, is necessary
to ensure correct turn-on.
5.6 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 fig. 23 has then allowed the full exploitation of its possibilities. The clear advantagesthis new approach has over classical output stages are as follows:
5.6.1 Rail-to-Rail Output Voltage Swing With No Need of Bootstrap Capacitors.
The output swing is limited only by the V
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.
5.6.2 Absolute Stability Without Any External Compensation.
Referring to the circuit of fig. 23 the gain V
output (V
/2) is fixed by an auxiliary amplifier common to all the channels.
CC
By controlling the amount of this local feedbackit is possible to force the loop gain (A*β) to less than unity
at frequency for which the phase shift is 180°. This means that the output buffer is intrinsically stableand
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.
of the output transistors, which is in the range of 0.3Ω (R
CEsat
is greater than unity, approximately 1+R2/R1. The DC
Out/VIn
sat
)
5.7 BUILT–IN SHORTCIRCUIT PROTECTION
Figure 23. 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 V
, across the speaker, a SOFT
S
SHORT condition is signalled out during the TURN-ON PHASE so assuring correct operation for the de-
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TDA7375V
vice itself and for the loudspeaker.
This particular kind of protection acts in a way to avoid that the device is turned on (by ST-BY) 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 5mA 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 5mA.
This extra function becomes particularly attractive when, in the single ended configuration, one capacitor
is shared between two outputs (see fig. 24). Supposing that the output capacitor Cout for anyreason is
shorted, the loudspeaker will not be damaged being this soft short circuit condition revealed.
Figure 24. Single ended configuaration circuit
5.7.1 Diagnostics Facility
The TDA7375 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 overdriven.
5.7.2 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 25. Clipping Detection Waveforms
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Figure 26. Output Fault Waveforms (see fig. 27)
Figure 27. Fault Waveforms
TDA7375V
5.8 HANDLING OF THE DIAGNOSTICS INFORMATION
As various kinds of information is 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 than that present under
faulty conditions; based on this assumption an interface circuitry to differentiate the information is represented in the schematic of fig. 29.
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TDA7375V
Figure 28. Waveforms
Figure 29. Interface circuitry to differentiate the information schematic
5.9 PCB-LAYOUT GROUNDING (general rules)
The device has 2 distinct ground leads, P-GND (POWER GROUND) and S-GND (SIGNAL GROUND)
which are practically disconnected from each other at chip level. Proper operation requires that P-GND
and S-GND leads be connected together on the PCB-layout by means of reasonably low-resistance
tracks.
As for the PCB-ground configuration, a star-like arrangement whose center is represented by the supplyfiltering electrolytic capacitor ground is highly advisable. In such context, at least 2 separate paths have
to be provided, one for P-GND and one for S-GND. The correct ground assignments are as follows:
STANDBY CAPACITOR, pin 7 (or any other standby driving networks): on S-GND
SVR CAPACITOR (pin 6): on S-GND and to be placed as close as possible to the device.
INPUT SIGNAL GROUND (from active/passive signal processor stages): on S-GND.
SUPPLY FILTERING CAPACITORS (pins 3,13): on P-GND.
The (-) terminal of the electrolytic capacitor has to be directly tied to the battery (-) line and this should
represent the starting point for all the ground paths.
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TDA7375V
6 PACKAGE INFORMATION
In order to meet environmental requirements, ST (also) offers these devices in ECOPACK® packages.
ECOPACK® packages are lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 30. Multiwatt 15 Mechanical Data & Package Dimensions
DIM.
A5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060
G1 17.53 17.78 18.03 0.690 0.700 0.710
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 17.65 18.1 0.695 0.713
L3 17.25 17.5 17.7 5 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.4 29
L7 2.65 2.9 0.104 0.114
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
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
OUTLINE AND
MECHANICAL DATA
Multiwatt15 (Vertical)
0016036 J
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TDA7375V
7 REVISION HISTORY
Table 5. Revision History
Date Revision Description of Changes
July 2004 2 First Issue in EDOCS
March 2005 3 Changed the Style-sheet in compliance to the new “Corporate Technical
01-Jul-2008 4 Updated the root part number in the title of the cover page.
Pubblications Design Guide”.
Deleted package Multiwatt15 Horizontal.
Added Ecopack information in “PACKAGE INFORMATION” section.
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TDA7375V
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