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4 x 6W POWER AMPLIFIER FOR CAR RADIO
HIGHPOWERCAPABILITY:
4x6Wmin/4Ω @14.4V, 1KHz,10%
4x10Wtyp/2Ω @14.4V,1KHz,10%
MINIMUMEXTERNALCOMPONENT COUNT
- INTERNALLY FIXED GAIN (40dB)
- NO BOOTSTRAPCAPACITORS
- NO EXTERNALCOMPENSATION
ST-BYFUNCTION (CMOS COMPATIBLE)
MUTE FUNCTION(CMOS COMPATIBLE)
NO AUDIBLE POP DURING MUTE/ST-BY
OPERATIONS
LOW SUPPLY SELF MUTING
PROGRAMMABLETURN ON DELAY
TDA7372B
ADVANCE DATA
MULTIWATT15
ORDERING NUMBER: TDA7372B
FORTUITOUS OPEN GND
REVERSEBATTERY
ESDPROTECTION
PROTECTIONS:
AC OUTPUTSHORTCIRCUIT TOGND
DC OUTPUT SHORT CIRCUIT TO GND AND
TO V
SOFT THERMAL LIMITER
OVERRATINGCHIPTEMPERATURE
LOADDUMP VOLTAGE
BLOCK DIAGRAM
ATPOWER ON
S
DESCRIPTION
TheTDA7372Bis a newtechnologyclassABquad
channels Audio Power Amplifier in Multiwatt15
packagedesignedforcarradioapplications.
Thanks to the fully complementaryPNP/NPNoutput configuration the TDA7372B delivers a rail to
rail voltage swing with no need of boostrap capacitors.
April 1995
This isadvanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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TDA7372B
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
PEAK
P
T
stg,Tj
I
I
DC Supply Voltage 28 V
S
Operating SupplyVoltage 18 V
OP
Peak Supply Voltage (t = 50ms) 50 V
Output Peak Current (not rep. t = 100µs) 4 A
O
Output Peak Current (rep. f > 10Hz) 3 A
O
Power Dissipation (T
tot
=85°C) 32 W
case
Storage and JunctionTemperature -40 to 150 °C
THERMAL DATA
Symbol Description Value Unit
R
th j-case
Thermal Resistance Junction-case Max 2 °C/W
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TDA7372B
ELECTRICAL CHARACTERISTICS (Refer to thetest circuit;VS=14.4V; RL=4Ω,T
amb
=25°C,
f = 1kHz, unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
d
P
O
d Distortion R
CT Cross Talk f = 1kHz; R
R
IN
G
V
G
V
BW Bandwidth @ -3dB 75 KHz
E
NO
SVR Supply Voltage Rejection R
ASB Stand-by Attenuation 80 dB
I
SB
I
PIN7
V
SB IN
V
SB OUT
A
M
V
MIN
V
MOUT
(*) 22Hz to 22KHz
Supply Range 8 18 V
Total QuiescentDrain Current 150 mA
Output Power RL=4Ω; THD = 10%
6 6.5 W
each channel
R
=2Ω; THD = 10%
L
10 W
each channel
=4Ω;
L
P
= 0.1 to 3W
O
f = 10kHz; R
g
=0
=0
g
45 50
0.08 0.5 %
40
Input Impedance 35 KΩ
Voltage Gain 40 dB
Voltage GainMatch. 1 dB
Output Noise Voltage (*) Rg= 0 300 µV
= 0; f = 100Hz 45 dB
g
ST-BY Current Consumption Vpin7 = 1.5V 100 µA
ST-BY Pin Current Play mode; Vpin7= 5V 50 µA
Output Under Short (Max
5mA
driving current under fault)
ST-BY IN Threshold Voltage 1.5 V
ST-BY OUT Threshold Voltage 3.5 V
MUTE Attenuation 80 dB
MUTE IN Threshold Voltage 1.5 V
MUTE OUT Threshold Voltage 3.5 V
dB
dB
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TDA7372B
TEST AND APPLICATION CIRCUIT
R2
10µF
C13
If high source resistance is present (e.g. passive audio controls) it might be necessary to add C = 470pF from each input pin to S-GND to
prevent instability phenomena.
Figure1: P.C. Boardand componentslayout of the Test and ApplicationCircuit(1:1 scale)
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TDA7372B
Figure 2: Quiescent Drain Current vs. Supply
Voltage
Figure4: Output Power vs SupplyVoltage
Figure3: OutputPower vs. SupplyVoltage
Figure 5: Output power vs. Frequency vs.C
Value
OUT
Figure6: Distortion vs. Output Power
Figure7: Distortionvs. Output Power
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TDA7372B
Figure8: Distortion vs. Frequency
Figure10: Cross-Talkvs. Frequency
Figure9: Distortionvs. Frequency
Figure11: SupplyVoltageRejectionvs.Frequency
Figure 12: TotalPower Dissipation and Efficiency
P
(W)
tot
P
tot
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Figure13: Total Power Dissipation and Efficiency
vs. Output Power
P
(W)
tot
P
tot
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Figure14: TDA7317+ 7372 Application Circuit.
TDA7372B
10µF
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TDA7372B
FUNCTIONAL DESCRIPTION
Function Description
The TDA7372B is a quad channel single package audio power amplifier intended to reduce the
GENERAL
OUTPUT STAGE
ST-BY
MUTE
THERMAL
PROTECTION
BUILT-IN SHORT
CIRCUIT
PROTECTION
mismatch in the electrical characteristics among the four different channels and to consistently
drop the external component count. It contains four non inverting stages whose gain is
internally fixed to 40dB.
The output stage is a single ended type suitable to drine 4Ω loads.It consists of a class AB fully
complementary PNP/NPN stages short circuit protected.
A rail to rail output swing is achieved without need of boostrap capacitors. Moreover, the
external compensation is not necessary.
The device features a St-BY function which shuts down the internal bias supplies when the STBY input is low. In ST-BY mode the amplifier sinks a small current (in the range of few µAs).
When the St-BYpin is high the IC becomes fully operational.
A mute function is also provided. This reduces the gain of the input stage to a level effectively
eliminating any audio input influence on the output stage when the mute line is low. When the
mute line is high the normal input path is restored.
The device goes automatically is mute status when the supply voltage goes below the minimum
allowed value. This prevents pop noises whenever the battery voltage drops below a fixed
threshold. When the supply voltage rises to its nominal value the device recovers the play
condition with a delay fixed by the C
SVR
The Thermal protection principle involves two different steps
a) Soft thermal limitation
b) Shutdown
Until the juntion temperature remains below a preset threshold, the I.C. will deliver the full
power. Once the threshold has been reached, the device automatically goes, into mute status.
The play to mute transition is internally controlled so producing a soft muting without unpleasent
effect. Supposing the junction temperature does not reduce to safe levels a complete shutdown
will occur.
Reliable and safe operation in presence of:
- AC short circuit to GND
- DC short circuit to GND and to V
duringpower-on phase
S
is assured by a built-in protection circuitry.
the DC short protector acts in such a way to avoid the device is turned on (by ST-BY) when a
DC short is present between out to GND or out to V
introduce a proper delay on the st-by pin (expeciallywhen it is driven by V
More over, 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 pin it self limited to5mA. (figure 1 is showing relevant waveforms).
capacitor.
. Due to this reason it is necessary to
S
.)
S
Figure15: Fault (DCshort) waveforms
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MULTIWATT15 PACKAGE MECHANICAL DATA
TDA7372B
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 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 0.870 0.886
L2 17.65 18.1 0.695 0.713
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
L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.63 5.08 5.53 0.182 0.200 0.218
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
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TDA7372B
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such informationnor for any infringement of patents or otherrights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All RightsReserved
MULTIWATT is a Registered Trademark of the SGS-THOMSON Microelectronics
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil- France -Germany - Hong Kong - Italy - Japan - Korea -Malaysia -Malta - Morocco - The Netherlands - Singapore-
Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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