This is information on a product in full production.
June 2012 Doc ID 14256 Rev 4 1/11
1
TDA7388
4 x 45 W quad bridge car radio amplifier
Datasheet − production data
Features
■High output power capability:
– 4 x 45 W / 4 Ω max.
– 4 x 26 W / 4 Ω @ 14.4 V, 1 kHz, 10 %
■Low distortion
■Low output noise
■Standby function
■Mute function
■Automute at min. supply voltage detection
■Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
Protections:
■Output short circuit to gnd, to V
S
, across the
load
■Very inductive loads
■Overrating chip temperature with soft thermal
limiter
■Load dump voltage
■Fortuitous open GND
■Reversed battery
■ESD
Description
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.
'!0'03
Flexiwatt25
Table 1. Device summary
Order code Package Packing
TDA7388 Flexiwatt25 Tube
www.st.com
Contents TDA7388
2/11 Doc ID 14256 Rev 4
Contents
1 Pin connection and test/application diagrams . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TDA7388 List of tables
Doc ID 14256 Rev 4 3/11
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
List of figures TDA7388
4/11 Doc ID 14256 Rev 4
List of figures
Figure 1. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
TDA7388 Pin connection and test/application diagrams
Doc ID 14256 Rev 4 5/11
1 Pin connection and test/application diagrams
Figure 1. Pin connection (top view)
Figure 2. Standard test and application circuit
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Electrical specifications TDA7388
6/11 Doc ID 14256 Rev 4
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
2.3 Electrical characteristics
VS = 14.4 V; f = 1 kHz; Rg = 600 Ω; RL = 4 Ω; Tamb = 25 °C; Refer to the test and application
diagram (Figure 2), unless otherwise specified.
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
S
Operating supply voltage 18 V
V
S (DC)
DC supply voltage 28 V
V
S (pk)
Peak supply voltage (t = 50 ms) 50 V
I
O
Output peak current:
Repetitive (duty cycle 10 % at f = 10 Hz)
Non repetitive (t = 100 µs)
4.5
5.5
A
P
tot
Power dissipation, (T
case
= 70 °C) 80 W
T
j
Junction temperature 150 °C
T
stg
Storage temperature – 55 to 150 °C
Table 3. Thermal data
Symbol Parameter Value Unit
R
th j-case
Thermal resistance junction-to-case max. 1 °C/W
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
I
q1
Quiescent current R
L
= ∞ 120 190 350 mA
V
OS
Output offset voltage Play mode - - ±100 mV
dV
OS
During mute ON/OFF output
offset voltage ITU R-ARM weighted -80 - +80 mV
G
v
Voltage gain - 25 26 27 dB
P
o
Output power THD = 10 %; V
S
= 14.4 V 22 26 - W
P
o max
Max.output power(1) V
S
= 14.4 V 37 41 - W
V
S
= 15.2 V - 45 -
THD Distortion P
o
= 4 W - 0.04 0.15 %
TDA7388 Electrical specifications
Doc ID 14256 Rev 4 7/11
e
No
Output noise "A" Weighted - 50 70 µV
Bw = 20 Hz to 20 kHz - 70 100 µV
SVR Supply voltage rejection f = 100 Hz; V
r
= 1 Vrms 50 65 - dB
f
ch
High cut-off frequency P
o
= 0.5 W 100 200 - KHz
R
i
Input Impedance - 70 100 - KΩ
C
T
Cross talk f = 1 kHz; Po = 4 W 60 70 - dB
f = 10 kHz; Po = 4 W - 60 - dB
I
SB
Standby current
consumption V
St-by
= 0V - - 20 µA
V
SB out
Standby OUT threshold
voltage (Amp: ON) 3.5 - - V
V
SB IN
Standby IN threshold
voltage (Amp: OFF) - - 1.5 V
A
M
Mute attenuation P
Oref
= 4 W 80 90 - dB
V
M out
Mute OUT threshold voltage (Amp: play) 3.5 - - V
V
M in
Mute IN threshold voltage (Amp: mute) - - 1.5 V
V
AM in
V
S
automute threshold
(Amp: mute); Att. ≥ 80 dB;
P
Oref
= 4 W
(Amp: play); Att. < 0.1 dB;
P
O
= 0.5 W
-
7.6
6.5
8.5
V
I
pin22
Muting pin current V
MUTE
= 1.2 V (Source current) 5 11 20 µA
1. Saturated square wave output.
Table 4. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Application hints TDA7388
8/11 Doc ID 14256 Rev 4
3 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 (R
2
) is 70 kΩ, which is sufficiently high to permit a muting capacitor
reasonably small (about 1 µF).
If R
2
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.
TDA7388 Package information
Doc ID 14256 Rev 4 9/11
4 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 3. Flexiwatt25 mechanical data and package dimensions
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Revision history TDA7388
10/11 Doc ID 14256 Rev 4
5 Revision history
Table 5. Document revision history
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 6.
20_Jun-2012 4 Updated Section 3.3: Standby and muting.
TDA7388
Doc ID 14256 Rev 4 11/11
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