This is information on a product in full production.
July 2012 Doc ID 14257 Rev 3 1/13
1
TDA7388A
4 x 42 W quad bridge car radio amplifier
Datasheet − production data
Features
■High output power capability:
– 4 x 42 W / 4 Ω max.
– 4 x 27 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
■Clipping detector
■Offset detector
■Diagnostic facility for:
– Out to GND short
– Out to V
S
short
– Thermal shutdown
■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
– Output DC offset detector
– Reversed battery
– ESD
Description
The TDA7388A is a new technology class AB
audio power amplifier in Flexiwatt27 package
designed for high end car radio applications.
Thanks to the fully complementary PNP/NPN
output configuration the TDA7388A allows a rail to
rail output voltage swing with no need of bootstrap
capacitors. The extremely reduced components
count allows very compact sets.
The TDA7388A is also equipped with Clipping
detector and Offset detector features.
'!0'03
Flexiwatt27
Table 1. Device summary
Order code Package Packing
TDA7388A Flexiwatt27 Tube
www.st.com
Contents TDA7388A
2/13 Doc ID 14257 Rev 3
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
2.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 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
TDA7388A List of tables
Doc ID 14257 Rev 3 3/13
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
List of figures TDA7388A
4/13 Doc ID 14257 Rev 3
List of figures
Figure 1. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Output power vs. supply voltage (4 Ohm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Distortion vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Distortion vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 9. Output noise vs. source resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10. Power dissipation & efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 11. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . . 9
Figure 12. Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TDA7388A Pin connection and test/application diagrams
Doc ID 14257 Rev 3 5/13
1 Pin connection and test/application diagrams
Figure 1. Pin connections (top view)
Figure 2. Standard test and application circuit
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Electrical specifications TDA7388A
6/13 Doc ID 14257 Rev 3
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
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
Tamb Operative temperature range – 40 to 105 °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
= ∞ 100 190 350 mA
V
OS
Output offset voltage Play mode - - ±100 mV
dV
OS
During mute ON/OFF output
offset voltage ITU R-ARM weighted
see Figure 11
-10 - +10 mV
During St-By ON/OFF
output offset voltage -50 - +50 mV
G
v
Voltage gain - 25 26 27 dB
ΔG
v
Channel gain unbalance - - - ±1 dB
P
o
Output power THD = 10 %; V
S
= 14.4 V 25 27 - W
TDA7388A Electrical specifications
Doc ID 14257 Rev 3 7/13
P
o max
Max.output power(1) V
S
= 14.4 V 39 42 - W
THD Distortion P
o
= 4 W - 0.04 0.10 %
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 V
rms
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
= 0 V - - 20 µA
I
pin4
Standby pin current V
St-By
= 1.2 to 2.6 V - - ±10 µA
V
SB out
Standby out threshold
voltage (Amp: on) 2.6 - - V
V
SB IN
Standby in threshold voltage (Amp: off) - - 1.2 V
A
M
Mute attenuation P
Oref
= 4 W 80 90 dB
V
M out
Mute out threshold voltage (Amp: Play) 2.6 - - V
V
M in
Mute in threshold voltage (Amp: Mute) - - 1.2 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
V
I
pin22
Muting pin current V
MUTE
= 1.2 V
(Source current) 51120µA
Offset detector
V
off
Detected diff. output offset V
St-by
=5V ±1.4 ±2 ±2.6 V
VOFF LK VOFF high leakage current OD off - - 10 µA
VOFF SAT VOFF det saturation voltage OD on; IOD = 1 mA - 300 - mV
Clipping detector
CD
LK
Clip det high leakage current CD Off - - 10 µA
CD
SAT
Clip det sat voltage DC On; I
CD
= 1 mA - 300 - mV
CD
THD
Clip det THD level - - 0.2 - %
1. Saturated square wave output.
Table 4. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Electrical specifications TDA7388A
8/13 Doc ID 14257 Rev 3
2.4 Electrical characteristic curves
Figure 3. Quiescent current vs. supply
voltage
Figure 4. Output power vs. supply voltage
(4 Ohm)
Figure 5. Distortion vs. output power
Figure 6. Distortion vs. frequency
Figure 7. Supply voltage rejection vs.
frequency
Figure 8. Crosstalk vs. frequency
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TDA7388A Electrical specifications
Doc ID 14257 Rev 3 9/13
Figure 9. Output noise vs. source resistance
Figure 10. Power dissipation & efficiency vs.
output power
Figure 11. ITU R-ARM frequency response,
weighting filter for transient pop
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Application hints TDA7388A
10/13 Doc ID 14257 Rev 3
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 TDA7388A’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
will amount to 16 Hz.
3.3 Standby and muting
Standby and muting facilities are both 3.3V CMOS-compatible. If unused, a straight
connection to VS of their respective pins would be admissible.
Conventional/low-power transistors can be employed to drive muting and stand-by 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 23, 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 will be that the voltage at pin 23 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 slower than 2.5 V/ms.
TDA7388A Package information
Doc ID 14257 Rev 3 11/13
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 12. Flexiwatt27 mechanical data and package dimensions
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Revision history TDA7388A
12/13 Doc ID 14257 Rev 3
5 Revision history
Table 5. Document revision history
Date Revision Changes
06-Dec-2007 1 Initial release.
15-Oct-2008 2 Document status promoted from preliminary data to datasheet.
Updated Table 3: Thermal data on page 6.
06-Jul-2012 3 Updated Table 2: Absolute maximum ratings on page 6.
TDA7388A
Doc ID 14257 Rev 3 13/13
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