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User Manual: Datasheets TDA7375-J15-A, TDA7375G-J15-A, TDA7375H, TDA7375L-J15-A, TDA7375V.

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TDA7375



2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO
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)
NOAUDIBLE POPDURING ST-BYOPERATIONS
DIAGNOSTICS FACILITY FOR:
– CLIPPING
– OUT TO GND SHORT
– OUT TO VS SHORT
– SOFT SHORT AT TURN-ON
– THERMAL SHUTDOWN PROXIMITY
Protections:
OUPUT AC/DC SHORT CIRCUIT

MULTIWATT15V

MULTIWATT15H

ORDERING NUMBERS:
TDA7375V
TDA7375H

– TO GND
– TO VS
– ACROSS THE LOAD
SOFT SHORT AT TURN-ON
OVERRATING CHIP TEMPERATURE WITH
SOFT THERMAL LIMITER
LOAD DUMP VOLTAGE SURGE
VERY INDUCTIVE LOADS
FORTUITOUS OPEN GND
REVERSED BATTERY
ESD

BLOCK DIAGRAM

DIAGNOSTICS

September 1998

1/15

TDA7375
DESCRIPTION
The TDA7375 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 guaran-

tees 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.
GENERAL STRUCTURE

ABSOLUTE MAXIMUM RATINGS
Symbol

Parameter

Value

Unit

Vop

Operating Supply Voltage

18

V

VS

DC Supply Voltage

28

V

Peak Supply Voltage (for t = 50ms)

50

V

IO

Output Peak Current (not repetitive t = 100µs)

4.5

A

IO

Output Peak Current (repetitive f > 10Hz)

3.5

A

Power Dissipation (Tcase = 85°C)

36

W

-40 to 150

°C

Vpeak

Ptot
Tstg, Tj

Storage and Junction Temperature

THERMAL DATA
Symbol
Rth j-case

Description
Thermal Resistance Junction-case

Max

PIN CONNECTION (Top view)

DIAGNOSTICS

2/15

Value

Unit

1.8

°C/W

TDA7375
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = 14.4V; RL = 4Ω; f = 1KHz;
T amb = 25°C, unless otherwise specified
Symbol

Parameter

VS

Supply Voltage Range

Id

Total Quiescent Drain Current

VOS

Output Offset Voltage

PO

Output Power

PO max
PO EIAJ
THD

CT

Test Condition

Min.

Typ.

8
RL = ∞

Max.

Unit

18

V

150

mA

150

mV

THD = 10%; RL = 4Ω
Bridge
Single Ended
Single Ended, RL = 2Ω

23
6.5

25
7
12

W
W
W

VS = 14.4V, Bridge

36

40

W

EIAJ Output Power (***)

VS = 13.7V, Bridge

32

35

W

Distortion

R L = 4Ω
Single Ended, PO = 0.1 to 4W
Bridge, PO = 0.1 to 10W

Max. Output Power (***)

Cross Talk

0.02
0.03

f = 1KHz Single Ended
f = 10KHz Single Ended
f = 1KHz Bridge
f = 10KHz Bridge

55

dB
dB

60

dB
dB
KΩ
KΩ

Input Impedance

Single Ended
Bridge

20
10

30
15

GV

Voltage Gain

Single Ended
Bridge

19
25

20
26

GV

Voltage Gain Match

EIN

Input Noise Voltage

Bridge
Rg = 0; 22Hz to 22KHz
SVR

Supply Voltage Rejection

R g = 0; f = 300Hz

50

A SB

Stand-by Attenuation

PO = 1W

80

ISB

ST-BY Current Consumption

VST-BY = 0 to 1.5V

V SB

ST-BY In Threshold Voltage

V SB

ST-BY Out Threshold Voltage

Ipin7

ST-BY Pin Current

%
%

70
60

R IN

R g = 0; ”A” weighted, S.E.
Non Inverting Channels
Inverting Channels

0.3

21
27

dB
dB

0.5

dB

2
5

µV
µV

3.5

µV

90

dB

dB

1.5

µA
V

Play Mode V pin7 = 5V

50

µA

Max Driving Current Under
Fault (*)

5

mA

100
3.5

V

Icd off

Clipping Detector
Output Average Current

d = 1% (**)

90

µA

Icd on

Clipping Detector
Output Average Current

d = 5% (**)

160

µA

Voltage Saturation on pin 10

Sink Current at Pin 10 = 1mA

Vsat pin10

0.7

V

(*) See built-in S/C protection description
(**) Pin 10 Pulled-up to 5V with 10KΩ; RL = 4Ω
(***) Saturated square wave output.

3/15

TDA7375
STANDARD TEST AND APPLICATION CIRCUIT
Figure 1: Quad Stereo
10K R1
VS
C5
1000µF

ST-BY
C7
10µF
7

4

IN FL

C6
100nF
13

3

1

C1 0.22µF
IN FR

5

12
C4 0.22µF

IN RR

C9 2200µF

OUT FR

C11 2200µF

OUT RL

C12 2200µF

OUT RR

15
11

Note:
C9, C10, C11, C12 could be
reduced if the 2Ω operation is not
required.

OUT FL

2

C2 0.22µF
IN RL

C10 2200µF

C3 0.22µF
6

14
8

9

10

C8 47µF

DIAGNOSTICS

D94AU063A

Figure 2: Double Bridge

10K R1
ST-BY
C5
10µF
IN L

7

4
C1 0.47µF

IN R

13

3

1

5

OUT L
2

12
C2 0.47µF

15

11

OUT R

6
C8 47µF

VS
C3
1000µF

C4
100nF

14
8

9

10
DIAGNOSTICS

D94AU064A

Figure 3: Stereo/Bridge
10K
ST-BY

VS
10µF

IN L

100nF
13

7

4

3

1

5

2

0.22µF
IN BRIDGE

2200µF
12

0.47µF

OUT L

2200µF

0.22µF
IN L

1000µF

15
OUT
BRIDGE

11
6

8

OUT R

9

10

14

47µF
DIAGNOSTICS

4/15

D94AU065A

TDA7375
Figure 4: P.C. Board and Component Layout of the fig.1 (1:1 scale).

Figure 5: P.C. Board and Component Layout of the fig.2 (1:1 scale).

5/15

TDA7375
Figure 6: Quiescent Drain Current vs. Supply
Voltage (Single Ended and Bridge).

RL = 4Ω
Vi = 0

Figure 8: Output Power vs. Supply Voltage

S.E.
RL = 2Ω
f = 1KHz

Figure 10: Output Power vs. Supply Voltage

BTL
RL = 4Ω
f = 1KHz

Figure 7: Quiescent Output Voltage vs. Supply
Voltage (Single Ended and Bridge).

RL = 4Ω
Vi = 0

Figure 9: Output Power vs. Supply Voltage

S.E.
RL = 4Ω
f = 1KHz

Figure 11: Distortion vs. Output Power

S.E.
VS = 14.4V
RL = 2Ω

f = 15KHz

f = 1KHz

6/15

TDA7375
Figure 12: Distortion vs. Output Power

Figure 13: Distortion vs. Output Power

S.E.
VS = 14.4V
RL = 4Ω
f = 15KHz
f = 15KHz

f = 1KHz
f = 1KHz

Figure 14: Cross-talk vs. Frequency

S.E.
VS = 14.4V
RL = 4Ω
Rg = 10Ω

Figure 16: SupplyVoltage Rejection vs. Frequency

S.E.
Rg = 0
CSVR = 47µF
Vripple = 1Vrms

BTL
VS = 14.4V
RL = 4Ω

Figure 15: Supply Voltage Rejection vs. Frequency

BTL
Rg = 0
CSVR = 47µF
Vripple = 1Vrms

Figure 17: Stand-byAttenuation vs. Threshold
Voltage

BTL & S.E.
VS = 14.4V
RL = 4Ω
0 dB = 1W

7/15

TDA7375
Figure 18: Total Power Dissipation and Efficiency vs. Output Power

Figure 19: Total Power Dissipation and Efficiency vs. Output Power.

Ptot

S.E.
VS = 14.4V
RL = 4 x 4Ω
f = 1KHz

8/15

Ptot
BTL
VS = 14.4V
RL = 2 x 4Ω
f = 1KHz

TDA7375
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 20dB in Single Ended,
26dB 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/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 unplesant acoustic effect to the speakers.
STAND-BY DRIVING (pin 7)
Some precautions have to be taken in the definition of stand-by driving networks: pin 7 cannot be
directly 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.
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. 20 has then allowed the full exploitation of
its possibilities.
The clear advantages this new approach has over
classical output stages are as follows:

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 0.3Ω (Rsat) each.
Classical solutions adopting composite PNPNPN 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 fig. 20 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*β) 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.
BUILT–IN SHORT CIRCUIT PROTECTION
Figure 20: The New Output Stage

9/15

TDA7375
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 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 STBY 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.
21).

Figure 22: Clipping Detection Waveforms

Figure 21.

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.

Supposing that the output capacitor C out for any
reason is shorted, the loudspeaker will not be
damaged being this soft short circuit condition revealed.
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

10/15

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.
HANDLING OF THE DIAGNOSTICS INFORMAFigure 23: Output Fault Waveforms (see fig. 24)

TDA7375

TDA7375
Figure 24: Fault Waveforms

ST-BY PIN
VOLTAGE
2V
t
OUT TO Vs SHORT
OUTPUT
WAVEFORM
SOFT SHORT
t
OUT TO GND SHORT

Vpin 10

CORRECT TURN-ON
FAULT DETECTION
t
CHECK AT TURN-ON
(TEST PHASE)

TION
As various kinds of information is available at the
same pin (clipping detection, output fault, thermal
proximity), this signal must be handled properly in

D94AU149A

SHORT TO GND
OR TO Vs

order to discriminate each event.
This could be done by taking into account the different timing of the diagnostic output during each
case.

Figure 25: Waveforms

ST-BY PIN
VOLTAGE

t

Vs
OUTPUT
WAVEFORM
t

Vpin 10
WAVEFORM
t
CLIPPING
D94AU150

SHORT TO GND
OR TO Vs

THERMAL
PROXIMITY

11/15

TDA7375
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. 26.

Figure 26.

TDA7375

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
supply-filtering 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 assign-

12/15

ments 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.

TDA7375

DIM.

mm
MIN.

TYP.

A
B

inch
MAX.

MIN.

TYP.

5
2.65

C

MAX.
0.197
0.104

1.6

0.063

D
E

0.49

0.55

0.019

F

0.66

0.75

0.026

G
G1

1.02
17.53

1.27
17.78

1.52
18.03

0.040
0.690

1

0.039

H1

19.6
21.9

22.2

20.2
22.5

L1

21.7

22.1

L2

17.65

L3
L4

17.25
10.3

L7
M

0.022
0.030
0.050
0.700

0.060
0.710

0.862

0.874

0.795
0.886

22.5

0.854

0.870

0.886

18.1

0.695

17.5
10.7

17.75
10.9

0.679
0.406

0.689
0.421

0.699
0.429

2.65
4.25

4.55

2.9
4.85

0.104
0.167

0.179

0.114
0.191

M1

4.63

5.08

5.53

0.182

0.200

0.218

S
S1

1.9
1.9

2.6
2.6

0.075
0.075

0.102
0.102

Dia1

3.65

3.85

0.144

0.152

H2
L

OUTLINE AND
MECHANICAL DATA

0.772

0.713

Multiwatt15 V

13/15

TDA7375
mm

DIM.
MIN.

TYP.

inch
MAX.

MIN.

TYP.

MAX.

A

5

0.197

B

2.65

0.104

C

1.6

0.063

E

0.49

0.55

0.019

0.022

F

0.66

0.75

0.026

0.030

G

1.14

1.27

1.4

0.045

0.050

0.055

G1

17.57

17.78

17.91

0.692

0.700

0.705

H1

19.6

0.772

H2

20.2

0.795

L

20.57

0.810

L1

18.03

0.710

L2

2.54

0.100

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

L5

5.28

L6

0.208

2.38

0.094

L7

2.65

2.9

0.104

0.114

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

14/15

OUTLINE AND
MECHANICAL DATA

Multiwatt15 H

TDA7375

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
MULTIWATT  is a Registered Trademark of the STMicroelectronics
 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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http://www.st.com

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Title                           : TDA7375H, TDA7375V - Datasheet. www.s-manuals.com.
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Subject                         : TDA7375H, TDA7375V - Datasheet. www.s-manuals.com.
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