TDA7388
4 x 45 W quad bridge car radio amplifier
Datasheet - production data
Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
Protections:
Output short circuit to gnd, to VS, across the
load
Very inductive loads
'!0'03
Overrating chip temperature with soft thermal
limiter
Flexiwatt25
Load dump voltage
Fortuitous open GND
Reversed battery
ESD
Features
Description
High output power capability:
– 4 x 45 W / 4 max.
– 4 x 26 W / 4 @ 14.4 V, 1 kHz, 10 %
Low distortion
Low output noise
Standby function
Mute function
Automute at min. supply voltage detection
The TDA7388 is an AB class audio power
amplifier, packaged in Flexiwatt 25 and designed
for high end car radio applications.
Based on a fully complementary PNP/NPN
configuration, the TDA7388 allows a rail to rail
output voltage swing with no need of bootstrap
capacitors. The extremely reduced boundary
components count allows very compact sets.
Table 1. Device summary
Order code
Package
Packing
TDA7388
Flexiwatt25
Tube
September 2013
This is information on a product in full production.
DocID14256 Rev 6
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www.st.com
1
Contents
TDA7388
Contents
1
Pin connection and test/application diagrams . . . . . . . . . . . . . . . . . . . . 5
2
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4
Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1
SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3
Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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TDA7388
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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List of figures
TDA7388
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
4/13
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output power vs. supply voltage (4 Ohm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Distortion vs. output power (4 Ohm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Distortion vs. frequency (4 Ohm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output noise vs. source resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Total power disipation & efficiency (4 Ohm, sine). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power dissipation vs. average output power (4 Ohm, audio program simulation) . . . . . . . . 9
ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . . 9
Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DocID14256 Rev 6
TDA7388
Pin connection and test/application diagrams
Figure 1. Pin connection (top view)
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Pin connection and test/application diagrams
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Figure 2. Standard test and application circuit
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Electrical specifications
TDA7388
2
Electrical specifications
2.1
Absolute maximum ratings
Table 2. Absolute maximum ratings
Symbol
Value
Unit
Operating supply voltage
18
V
VS (DC)
DC supply voltage
28
V
VS (pk)
Peak supply voltage (t = 50 ms)
50
V
Output peak current:
Repetitive (duty cycle 10 % at f = 10 Hz)
Non repetitive (t = 100 µs)
4.5
5.5
A
Power dissipation, (Tcase = 70 °C)
80
W
Tj
Junction temperature
150
C
Tstg
Storage temperature
– 55 to 150
C
VS
IO
Ptot
2.2
Parameter
Thermal data
Table 3. Thermal data
Symbol
Rth j-case
6/13
Parameter
Thermal resistance junction-to-case
DocID14256 Rev 6
max.
Value
Unit
1
°C/W
TDA7388
2.3
Electrical specifications
Electrical characteristics
VS = 14.4 V; f = 1 kHz; Rg = 600 ; RL = 4 ; Tamb = 25 °C; Refer to the test and application
diagram (Figure 2), unless otherwise specified.
Table 4. Electrical characteristics
Symbol
Iq1
Parameter
Test condition
Min.
Typ.
Max.
Unit
120
190
350
mA
-
-
±100
mV
Quiescent current
RL =
VOS
Output offset voltage
Play mode
dVOS
During mute ON/OFF output ITU R-ARM weighted
offset voltage
see Figure 12
-80
-
+80
mV
Gv
Voltage gain
-
25
26
27
dB
Po
Output power
THD = 10 %; VS = 14.4 V
22
26
-
W
VS = 14.4 V
37
41
-
VS = 15.2 V
-
45
-
Po = 4 W
-
0.04
0.15
%
"A" Weighted
-
50
70
µV
Bw = 20 Hz to 20 kHz
-
70
100
µV
Po max
Max.output power(1)
W
THD
Distortion
eNo
Output noise
SVR
Supply voltage rejection
f = 100 Hz; Vr = 1 Vrms
50
65
-
dB
fch
High cut-off frequency
Po = 0.5 W
100
200
-
kHz
Ri
Input Impedance
-
70
100
-
k
CT
Cross talk
f = 1 kHz; Po = 4 W
60
70
-
dB
f = 10 kHz; Po = 4 W
-
60
-
dB
ISB
Standby current
consumption
VSt-by = 0V
-
-
20
µA
VSB out
Standby OUT threshold
voltage
(Amp: ON)
3.5
-
-
V
VSB IN
Standby IN threshold voltage (Amp: OFF)
-
-
1.5
V
POref = 4 W
80
90
-
dB
VM out
Mute OUT threshold voltage (Amp: play)
3.5
-
-
V
VM in
Mute IN threshold voltage
(Amp: mute)
-
-
1.5
V
VS automute threshold
(Amp: mute); Att. 80 dB;
POref = 4 W
(Amp: play); Att. < 0.1 dB;
PO = 0.5 W
-
VMUTE = 1.2 V (Source current)
5
AM
VAM in
Ipin22
Mute attenuation
Muting pin current
6.5
7.6
8.5
11
20
V
µA
1. Saturated square wave output.
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Electrical specifications
2.4
TDA7388
Electrical characteristic curves
Figure 3. Quiescent current vs. supply voltage
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Figure 4. Output power vs. supply voltage
(4 Ohm)
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Figure 5. Distortion vs. output power (4 Ohm)
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Figure 6. Distortion vs. frequency (4 Ohm)
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Figure 7. Supply voltage rejection vs. frequency
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Figure 8. Crosstalk vs. frequency
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TDA7388
Electrical specifications
Figure 9. Output noise vs. source resistance
Figure 10. Total power disipation & efficiency
(4 Ohm, sine)
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Figure 11. Power dissipation vs. average output
power (4 Ohm, audio program simulation)
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Figure 12. ITU R-ARM frequency response,
weighting filter for transient pop
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Application hints
3
TDA7388
Application hints
Ref. to the circuit of Figure 2.
3.1
SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients.
To conveniently serve both needs, its minimum recommended value is 10 µF.
3.2
Input stage
The TDA7388’s inputs are ground-compatible and can stand very high input signals
(±8 Vpk) without any performances degradation.
If the standard value for the input capacitors (0.1 µF) is adopted, the low frequency cut-off
amounts to 16 Hz.
3.3
Standby and muting
If standby and muting are not used, a straight connection to VS of their respective pins
would be admissible.
Conventional/low-power transistors can be employed to drive muting and standby pins in
absence of true CMOS ports or microprocessors. R-C cells have always to be used in order
to smooth down the transitions for preventing any audible transient noises.
Since a DC current of about 10 µA normally flows out of pin 22, the maximum allowable
muting-series resistance (R2) is 70 k, which is sufficiently high to permit a muting capacitor
reasonably small (about 1 µF).
If R2 is higher than recommended, the involved risk is that the voltage at pin 22 may rises to
above the 1.5 V threshold voltage and the device consequently fails 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 slower than 2.5 V/ms.
10/13
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TDA7388
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 13. Flexiwatt25 mechanical data and package dimensions
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Revision history
5
TDA7388
Revision history
Table 5. Document revision history
12/13
Date
Revision
Changes
06-Dec-2007
1
Initial release.
12-Jul-2010
2
Document status promoted from preliminary data to datasheet.
26-Apr-2012
3
Modified Features on page 1.
Updated Table 4: Electrical characteristics on page 7.
20-Jun-2012
4
Updated Section 3.3: Standby and muting.
11-Mar-2013
5
Added Section 2.4: Electrical characteristic curves.
17-Sep-2013
6
Updated Disclaimer.
DocID14256 Rev 6
TDA7388
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