TDA7372B
®
4 x 6W POWER AMPLIFIER FOR CAR RADIO
HIGH POWER CAPABILITY:
4x6W min/4Ω @14.4V, 1KHz, 10%
4x10W typ/2Ω @14.4V, 1KHz, 10%
MINIMUM EXTERNAL COMPONENT COUNT
- INTERNALLY FIXED GAIN (40dB)
- NO BOOTSTRAP CAPACITORS
- NO EXTERNAL COMPENSATION
ST-BY FUNCTION (CMOS COMPATIBLE)
MUTE FUNCTION (CMOS COMPATIBLE)
NO AUDIBLE POP DURING MUTE/ST-BY
OPERATIONS
LOW SUPPLY SELF MUTING
PROGRAMMABLE TURN ON DELAY
PROTECTIONS:
AC OUTPUT SHORT CIRCUIT TO GND
DC OUTPUT SHORT CIRCUIT TO GND AND
TO VS AT POWER ON
SOFT THERMAL LIMITER
OVERRATING CHIP TEMPERATURE
LOAD DUMP VOLTAGE
BLOCK DIAGRAM
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MULTIWATT15
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ORDERING NUMBER: TDA7372B
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FORTUITOUS OPEN GND
REVERSE BATTERY
ESD PROTECTION
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DESCRIPTION
The TDA7372B is a new technology class AB quad
channels Audio Power Amplifier in Multiwatt15
package designed for car radio applications.
Thanks to the fully complementary PNP/NPN output configuration the TDA7372B delivers a rail to
rail voltage swing with no need of boostrap capacitors.
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September 2003
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TDA7372B
PIN CONNECTION (Top view)
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ABSOLUTE MAXIMUM RATINGS
Symbol
VOP
VPEAK
IO
IO
Ptot
Tstg, Tj
)
(s
Parameter
DC Supply Voltage
VS
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Value
Unit
28
V
18
V
Peak Supply Voltage (t = 50ms)
50
V
Output Peak Current (not rep. t = 100µs)
4
A
Output Peak Current (rep. f > 10Hz)
3
A
Power Dissipation (Tcase = 85°C)
Storage and Junction Temperature
32
-40 to 150
W
°C
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Operating Supply Voltage
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THERMAL DATA
Symbol
Rth j-case
2/10
Description
Thermal Resistance Junction-case
Max
Value
Unit
2
°C/W
TDA7372B
ELECTRICAL CHARACTERISTICS (Refer to the test circuit; VS = 14.4V; RL = 4Ω, Tamb = 25°C,
f = 1kHz, unless otherwise specified)
Symbol
VS
Id
PO
Parameter
Supply Range
Total Quiescent Drain Current
Output Power
d
Distortion
CT
Cross Talk
RIN
GV
GV
BW
ENO
SVR
ASB
ISB
IPIN 7
VSB IN
VSB OUT
AM
VM IN
VM OUT
Test Condition
RL = 4Ω; THD = 10%
each channel
RL = 2Ω; THD = 10%
each channel
RL = 4Ω;
PO = 0.1 to 3W
f = 1kHz; Rg = 0
f = 10kHz; Rg = 0
Input Impedance
Voltage Gain
Voltage Gain Match.
Bandwidth
Output Noise Voltage (*)
Supply Voltage Rejection
Stand-by Attenuation
ST-BY Current Consumption
ST-BY Pin Current
Min.
8
Typ.
Max.
18
150
6
6.5
Unit
V
mA
W
10
W
0.08
45
50
40
0.5
@ -3dB
Rg = 0
Rg = 0; f = 100Hz
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ST-BY IN Threshold Voltage
ST-BY OUT Threshold Voltage
MUTE Attenuation
MUTE IN Threshold Voltage
MUTE OUT Threshold Voltage
)
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1
300
45
80
Vpin7 = 1.5V
Play mode; Vpin7 = 5V
Output Under Short (Max
driving current under fault)
100
50
5
1.5
3.5
80
1.5
3.5
dB
dB
KΩ
dB
dB
KHz
µV
dB
dB
µA
µA
mA
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35
40
%
V
V
dB
V
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(*) 22Hz to 22KHz
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3/10
TDA7372B
TEST AND APPLICATION CIRCUIT
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R2
10µF
C13
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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.
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Figure 1: P.C. Board and components layout of the Test and Application Circuit (1:1 scale)
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4/10
TDA7372B
Figure 2: Quiescent Drain Current vs. Supply
Voltage
Figure 3: Output Power vs. Supply Voltage
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Figure 4: Output Power vs Supply Voltage
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Figure 5: Output power vs. Frequency vs.COUT
Value
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Figure 6: Distortion vs. Output Power
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Figure 7: Distortion vs. Output Power
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TDA7372B
Figure 8: Distortion vs. Frequency
Figure 9: Distortion vs. Frequency
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Figure 10: Cross-Talk vs. Frequency
Figure 11: Supply Voltage Rejection vs. Frequency
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bs
Figure 12: Total Power Dissipation and Efficiency
O
Ptot (W)
Figure 13: Total Power Dissipation and Efficiency
vs. Output Power
Ptot (W)
Ptot
Ptot
6/10
TDA7372B
10µF
Figure 14: TDA7317 + 7372 Application Circuit.
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TDA7372B
FUNCTIONAL DESCRIPTION
Function
Description
GENERAL
OUTPUT STAGE
ST-BY
The TDA7372B is a quad channel single package audio power amplifier intended to reduce the
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-BY pin is high the IC becomes fully operational.
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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 CSVR capacitor.
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MUTE
THERMAL
PROTECTION
BUILT-IN SHORT
CIRCUIT
PROTECTION
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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 VS during power-on phase
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 VS. Due to this reason it is necessary to
introduce a proper delay on the st-by pin (expecially when it is driven by VS.)
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 to 5mA. (figure 1 is showing relevant waveforms).
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Figure 15: Fault (DC short) waveforms
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TDA7372B
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
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
L
OUTLINE AND
MECHANICAL DATA
MAX.
21.9
22.2
22.5
L1
21.7
22.1
L2
17.65
L3
17.25
L4
10.3
L7
2.65
M
4.25
M1
4.63
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0.795
0.862
0.874
0.886
22.5
0.854
0.870
0.886
18.1
0.695
17.5
17.75
0.679
0.689
0.699
10.7
10.9
0.406
0.421
0.429
2.9
0.104
4.55
4.85
0.167
0.179
0.191
5.08
5.53
0.182
0.200
0.218
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0.713
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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
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Multiwatt15 V
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9/10
TDA7372B
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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. Specifications 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.
All other names are the property of their respective owners
© 2003 STMicroelectronics - All rights reserved
STMicroelectronics GROUP OF COMPANIES
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10/10
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