ST TDA7383 User Manual

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

4 x 30W QUAD BRIDGE CAR RADIO AMPLIFIER

HIGHOUTPUTPOWERCAPABILITY:
4 x35W/4Ω MAX.
4 x30W/4ΩEIAJ
4 x22W/4Ω@ 14.4V, 1KHz, 10%
4 x18.5W/4Ω @ 13.2V,1KHz,10%

CLIPPINGDETECTOR
LOW DISTORTION
LOW OUTPUTNOISE
ST-BYFUNCTION
MUTEFUNCTION
AUTOMUTEAT MIN. SUPPLY VOLTAGE DE-

TECTION
DIAGNOSTICSFACILITYFOR:

– CLIPPING
– OUTTOGND SHORT
– OUTTOV
– THERMALSHUTDOWN

LOW EXTERNALCOMPONENTCOUNT:
– INTERNALLYFIXED GAIN (32dB)
– NOEXTERNALCOMPENSATION
– NOBOOTSTRAPCAPACITORS

PROTECTIONS:

OUTPUT SHORT CIRCUIT TO GND, TO V
ACROSS THE LOAD

SHORT

S

TDA7383

FLEXIWATT25

ORDERING NUMBER: TDA7383

VERYINDUCTIVE LOADS
OVERRATING CHIP TEMPERATURE WITH

SOFTTHERMAL LIMITER
LOADDUMP VOLTAGE
FORTUITOUSOPEN GND
REVERSEDBATTERY
ESD PROTECTION

DESCRIPTION

The TDA7383 is a new technology class AB
Audio Power Amplifier in Flexiwatt 25 package
designed for high end car radioapplications.

,

S

BLOCK AND APPLICATION DIAGRAM

Vcc1 Vcc2

ST-BY

MUTE

IN1

0.1µF

IN2

0.1µF

IN3

0.1µF

IN4

0.1µF

AC-GND

0.1µF47µF

October 1999

100nF2.200µF

DIAGN. OUT

OUT1+
OUT1­PW-GND

OUT2+
OUT2­PW-GND

OUT3+
OUT3­PW-GND

OUT4+
OUT4­PW-GND

SVR TAB S-GND

D93AU002C

1/12

TDA7383

DESCRIPTION(continued)

Thanks to the fully complementaryPNP/NPN out­put configurationthe TDA7383 allows a rail to rail
output voltage swing with no need of bootstrap
capacitors. The extremely reduced components
count allows very compact sets.

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

CC (DC)

V

CC (pk)

CC

I

O

Operating Supply Voltage 18 V
DC Supply Voltage 28 V
Peak Supply Voltage (t = 50ms) 50 V
Output Peak Current:

Repetitive (Duty Cycle 10% at f = 10Hz)
Non Repetitive(t = 100µs)

P

tot

T

j

T

stg

Power dissipation, (T

=70°C) 80 W

case

Junction Temperature 150
Storage Temperature – 55 to150

PIN CONNECTION (Topview)

The on-board clipping detector simplifies gain
compression operations. The fault diagnostics
makes it possible to detect mistakes during Car­Radioassembly and wiring in the car.

4.5

5.5

A
A

C

°

C

°

1 25

TAB

OUT2-

P-GND

ST-BY

CC

V

OUT2+

OUT1-

OUT1+

P-GND1

SVR

IN1

IN2

IN4

S-GND

IN3

OUT3+

AC-GND

OUT3-

P-GND3

CC

V

MUTE

OUT4+

D94AU117B

OUT4-

P-GND4

DIAGNOSTICS

THERMAL DATA

Symbol Parameter Value Unit

Thermal Resistance Junction to Case Max. 1

2/12

R

th j-case

C/W

°

TDA7383

ELECTRICALCHARACTERISTICS(VS= 14.4V; f = 1KHz; RL=4Ω;T

amb

=25°C;

Refer to the Testand application circuit (fig.1),unless otherwisespecified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

I

q1

V

OS

G

v

P

o

P

o EIAJ

P

o max.

THD Distortion P

e

No

SVR Supply Voltage Rejection f = 100Hz 50 65 dB

f

cl

f

ch

R

C

T

I

SB

V

SB out

V

SB IN

A

M

V

M out

V

Min

I

m (L)

I

CDOFF

I

CDON

(*) Saturated square wave output.
(**) Diagnostics output pulled-up to 5V with 10KΩ series resistor.

Quiescent Current 180 300 mA
Output Offset Voltage 200 mV
Voltage Gain 31 32 33 dB
Output Power THD = 10%

THD = 1%
THD = 10%; V

THD = 5%; V
THD = 1%; V

THD = 10%; V
THD = 1%; V

= 14V

S

= 14V

S

= 14V

S

= 13.2V

S

= 13.2V

S

20

16.5
19

17
16

17
14

22
18

21
19
17

18.5
15

EIAJ Ouput Power (*) VS = 13.7V 27.5 30 W
Max. Output Power (*) VS= 14.4V 33 35 W

= 4W 0.05 0.3 %

o

Output Noise ”A” Weighted

Bw = 20Hz to 20KHz

75

100 150

Low Cut-Off Frequency 20 Hz
High Cut-Off Frequency 75 KHz
Input Impedance 70 100 KΩ

i

Cross Talk f= 1KHz 50 70 dB
St-By Current Consumption St-By = LOW 100
St-By OUT ThresholdVoltage (Amp: ON) 3.5 V
St-By IN Threshold Voltage (Amp: OFF) 1.5 V
Mute Attenuation VO= 1Vrms 80 90 dB
Mute OUT Threshold Voltage (Amp: Play) 3.5 V
Mute IN Threshold Voltage (Amp: Mute) 1.5 V
Muting Pin Current V

MUTE

= 1.5V

51016µA

(Source Current)

Clipping Detector ”OFF” Output

THD = 1% (**) 100

Average Current
Clipping Detector ”ON” Output

THD = 10% (**) 100 240 350 µA

Average Current

W
W

W
W
W

W
W

µ
µV

µ

µ

V

A

A

3/12

TDA7383

Figure 1: StandardTest and Application Circuit

ST-BY

MUTE

IN1

IN2

IN3

IN4

R1

10K

R2

47K

C1

0.1µF

C2 0.1µF

C3 0.1µF

C4 0.1µF

C9

1µF

C10
1µF

S-GND

C8

0.1µF

4

22

11

12

15

14

13

16 10 25 1

C5

0.1µF

C7

2200µF

Vcc1-2 Vcc3-4

SVR TAB

C6

47µF

620

9
8
7

5
2
3

17
18
19

21
24
23

OUT1

OUT2

OUT3

OUT4

D94AU179B

4/12

DIAGNOSTICS

Figure 2: P.C.B. and componentlayout of the figure 1 (1:1scale)

TDA7383

COMPONENTS &
TOP COPPER LAYER

TDA7383

BOTTOM COPPER LAYER

5/12

TDA7383

Figure 3: QuiescentCurrent vs. Supply Voltage

Figure 5: Output Power vs. SupplyVoltage

Figure4: Quiescent Output Voltage vs. Supply

Voltage

Figure6: Distortionvs. Output Power

THD(%)

10

Vs= 14.4V
RL = 4 Ohm

Figure 7: Distortion vs. Frequency.

THD (%)

10

Vs= 14.4 V

RL = 4 Ohm

Po= 1 W

1

0.1

1

f= 10 KHz

0.1

0

0.1 1 10

f= 1 KHz

Po(W)

Figure 8: Supply Voltage Rejection vs.

Frequency

SVR (dB)

100

Rg= 600 Ohm

90

Vripple= 1 Vrms

80
70
60
50
40

0

10 100 1000 10000

f (Hz)

6/12

30

10 100 1000 10000

f (Hz)

TDA7383

Figure 9: Output Noise vs. Source Resistance

En (µV)

200
180

Vs= 14.4 V
RL= 4 Ohm

160
140
120

22 - 22K Hz lin.

100

80

”A” wgtd

60
40

1 10 100 1k 10k 100k

Rg (Ohm)

APPLICATIONHINTS (ref.to the circuit of fig. 1)
BIASING AND SVR
As shown by fig. 11, all the TDA7383’s main sec-

tions, such as INPUTS, OUTPUTS AND AC-GND
(pin 16) are internally biased at half Supply Volt­age level (Vs/2), whichis derived from the Supply
VoltageRejection (SVR) block. In this way no cur­rent flows throughthe internalfeedbacknetwork.

The AC-GND is common to all the 4 amplifiers
and represents the connection point of all the in­verting inputs.

Both individual inputs and AC-GND are con­nected to Vs/2 (SVR) by means of 100KΩresis­tors.

Figure10: Power Dissipation & Efficiency vs.

OutputPower

Ptot (W)

To ensure proper operation and high supply volt­age rejection, it is of fundamental importance to
provide a good impedance matching between IN­PUTS and AC-GROUND terminations. This im­pliesthat C

1,C2,C3,C4,C5

CAPACITORSHAVE
TO CARRY THE SAME NOMINAL VALUE AND
THEIR TOLERANCE SHOULDNEVER EXCEED
±10 %.

Besides its contributionto the ripple rejection, the
SVR capacitor governs the turn ON/OFFtime se­quence and, consequently,plays an essential role
in the pop optimizationduring ON/OFF transients.
To conveniently serve both needs, ITS MINIMUM

RECOMMENDEDVALUE IS 10µF.

Figure 11: Input/OutputBiasing.

V

S

10KΩ

SVR AC_GND

10KΩ

100KΩ

F

0.1µ

C1 ÷ C4

100KΩ70KΩ

47µ

F

C6

IN

0.1µ
C5

F

+

-

8KΩ

400Ω

400Ω

8KΩ

-

+

TOWARDS

OTHER CHANNELS

D95AU302

7/12

TDA7383

INPUT STAGE
The TDA7383’s inputs are ground-compatibleand

can stand very high inputsignals (± 8Vpk)without
any performancesdegradation.

If the standard value for the input capacitors
(0.1µF) is adopted, the low frequency cut-off will
amount to 16 Hz.

STAND-BYAND MUTING
STAND-BY and MUTING facilities are both

CMOS-COMPATIBLE. If unused, a straight con­nection to Vs of theirrespective pins wouldbe ad­missible. Conventional low-power transistorscan
be employed to drive muting and stand-by pins in
absence of true CMOSports or microprocessors.

R-C cells have always to be used in order to
smooth down the transitions for preventing any
audible transientnoises.

Since a DC current of about 10 uA normallyflows
out of pin 22, the maximum allowable muting-se­ries resistance (R

) is 70KΩ, which is sufficiently

2

high to permit a muting capacitor reasonably
small (about 1µF).

If R

is higher than recommended, the involved

2

risk will be that the voltage at pin 22 may rise to
above the 1.5 V threshold voltage and the device
will consequently fail to turn OFF when the mute
line is brought down.

About the stand-by, the time constant to be as­signed in order to obtain a virtually pop-free tran­sition has to be slowerthan 2.5V/ms.

tion with microprocessor-drivenaudioprocessors.
The maximum load that pin 25 can sustain is

1KΩ.
Due to its operating principles, the clipping detec-

tor has to be viewed mainly as a power-depend­Figure12: Diagnosticscircuit.

25

Vpin 25

R

VREF

D95AU303A

Figure13: Clipping Detection Waveforms.

DIAGNOSTICSFACILITY
The TDA7383 is equipped with a diagnostics cir-

cuitry able to detectthe following events:

CLIPPINGin the output stage
OVERHEATING (THERMAL SHUT-DOWN

proximity)
OUTPUT MISCONNECTIONS (OUT-GND &

OUT-Vsshorts)

Diagnostics information is available across an
open collector output located at pin 25 (fig. 12)
through a current sinking whenever at least one
of the above events is recognized.

Among them, the CLIPPING DETECTOR acts in
a way to output a signal as soon as one or more
power transistorsstart being saturated.

As a result, the clipping-related signal at pin 25
takes the form of pulses, which are perfectly syn­cronized with each single clipping event in the
music program and reflect the same duration time
(fig. 13). Applications making use of this facility
usually operatea filtering/integrationof the pulses
train through passive R-C networks and realize a
volume (or tone bass) stepping down in associa-

8/12

ent feature rather than frequency-dependent.This
means that clipping state will be immediately sig­naled out whenever a fixed power level is
reached,regardlessof the audiofrequency.

In other words, this feature offers the means to
counteract the extremely sound-damaging effects
of clipping, caused by a sudden increase of odd
order harmonics and appearance of serious inter­modulationphenomena.

Another possible kind of distortion control could
be the setting of a maximum allowable THD limit
(e.g. 0.5 %) over the entire audio frequency
range. Besides offering no practical advantages,
this procedure cannot be much accurate, as the
non-clipping distortion is likely to vary over fre­quency.

In case of OVERHEATING, pin 25 will signal out
the junction temperature proximity to the thermal
shut-down threshold. This will typically start about

o

C beforethe thermal shut-downthreshold is

2

Figure 14: DiagnosticsWaveforms.

ST-BY PIN
VOLTAGE

MUTE PIN
VOLTAGE

Vs

OUTPUT

WAVEFORM

Vpin 25

WAVEFORM

TDA7383

t

t

t

D95AU304

reached.
As variouskind of diagnostics informationis avail-

able at pin 25 (CLIPPING, SHORTS AND OVER­HEATING), it may be necessary to operate some
distinctions on order to treat each event sepa­rately. This could be achieved by taking into ac­count the intrinsically different timing of the diag­nostics outputunder each circumstance.

Figure 15.

VREF

25

T1 <<

T2

VREF ≥ VREF1 >> VREF2

T1

T2

VREF1

VREF2

CLIPPING

SHORT TO GND

OR TO Vs

THERMAL

PROXIMITY

t

In fact, clipping will produce pulses normally
much shorter than thosepresent under faultycon­ditions. An example of circuit able to distinguish
between the two occurrences is shown by fig. 15.

STABILITYAND LAYOUT CONSIDERATIONS
If properly layouted and hooked to standard car-

radio speakers, the TDA7383 will be intrinsically
stable with no need of external compensations

-

+

-

+

CLIP DET. (TO

COMPRESSOR/

TONE CONTROL)

FAULT, THERMAL

(TO POWER SUPPLY

SECTION, µP

REGULATOR, FLASHING SYSTEM)

D95AU305A

GAIN

SHUTDOWN

VOLTAGE

9/12

TDA7383

such as output R-C cells. Dueto the high number
of channels involved, this translates into a very
remarkable components saving if compared to
similar devices on the market.

To simplify pc-board layout designs, each ampli­fier stage has its own power ground externallyac­cessible (pins 2,8,18,24) and one supply voltage
pin foreach couple of them.

Even more important, this makes it possible to
achieve the highest possible degreeof separation
among the channels,with remarkable benefits in
termsof cross-talkand distortionfeatures.

About the layout grounding, it is particularly im-

portant to connect the AC-GND capacitor (C

)to

5

the signal GND, as close as possible to the audio
inputs ground: this will guarantee high rejection of
any common mode spurious signals.

The SVR capacitor (C

) has also to be connected

6

to the signalGND.
Supply filtering elements (C

) have naturally

7,C8

to be connected to the power-groundand located
as close as possibleto theVs pins.

Pin 1, which is mechanically attached to the de­vice’s tab, needs to be tied to the cleanest power
ground point in the pc-board, which is generally
near the supplyfilteringcapacitors.

10/12

TDA7383

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

mm inch

A 4.45 4.50 4.65 0.175 0.177 0.183
B 1.80 1.90 2.00 0.070 0.074 0.079
C 1.40 0.055
D 0.75 0.90 1.05 0.029 0.035 0.041
E 0.37 0.39 0.42 0.014 0.015 0.016

F (1) 0.57 0.022

G 0.80 1.00 1.20 0.031 0.040 0.047

G1 23.75 24.00 24.25 0.935 0.945 0.955

H (2) 28.90 29.23 29.30 1.138 1.150 1.153

H1 17.00 0.669
H2 12.80 0.503
H3 0.80 0.031

L (2) 22.07 22.47 22.87 0.869 0.884 0.904

L1 18.57 18.97 19.37 0.731 0.747 0.762

L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626

L3 7.70 7.85 7.95 0.303 0.309 0.313
L4 5 0.197
L5 3.5 0.138

M 3.70 4.00 4.30 0.145 0.157 0.169

M1 3.60 4.00 4.40 0.142 0.157 0.173

N 2.20 0.086
O 2 0.079

R 1.70 0.067
R1 0.5 0.02
R2 0.3 0.12
R3 1.25 0.049
R4 0.50 0.019

V5°(Typ.)

V1 3°(Typ.)
V2 20°(Typ.)
V3 45°(Typ.)

(1): dam-bar protusion not included
(2): molding protusionincluded

OUTLINE AND

MECHANICALDATA

Flexiwatt25

L2

H

V3

OL3 L4

V

C

H3

G

H1

G1

R3

H2

F

A

R4

N

V2

R2

R

L

L1

V1

R2

B

V

FLEX25ME

R1

L5

V1

R1 R1

E

M1

M

D

11/12

TDA7383

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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.

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