TDA7385
4 x 42 W quad bridge car radio amplifier
Datasheet production data
Features
■
High output power capability:
– 4 x 42 W / 4 max.
– 4 x 23 W / 4 @ 14.4 V, 1 kHz, 10 %
■
Clipping detector
■
Low distortion
■
Low output noise
'!0'03
Flexiwatt25
■
Standby function
■
Mute function
■
Automute at min. supply voltage detection
■
Diagnostics facility for:
– Clipping
– Out to GND short
– Out to VS short
– Thermal shutdown
■
■
– Reversed battery
– ESD
Description
Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
The TDA7385 is an AB class audio power
amplifier, packaged in Flexiwatt 25 and designed
for high end car radio applications.
Protections:
– Output short circuit to GND, to VS, across
the load
– Very inductive loads
– Overrating chip temperature with soft
thermal limiter
– Load dump voltage
– Fortuitous open GND
Table 1.
Based on a fully complementary PNP/NPN
configuration, the TDA7385 allows a rail to rail
output voltage swing with no need of bootstrap
capacitors. The extremely reduced boundary
components count allows very compact sets.
The on-board clipping detector simplifies gain
compression operations. The fault diagnostics
makes it possible to detect mistakes during carradio assembly and wiring in the car.
Device summary
Order code
Package
Packing
TDA7385
Flexiwatt25
Tube
E-TDA7385(1)
Flexiwatt25
Tube
1. Device in ECOPACK® package (see Section 4: Package information on page 15).
September 2013
This is information on a product in full production.
Doc ID 8160 Rev 6
1/17
www.st.com
1
Contents
TDA7385
Contents
1
Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4
PCB and component layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5
Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
Biasing and SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3
Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4
Diagnostics facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5
Stability and layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
Doc ID 8160 Rev 6
TDA7385
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Doc ID 8160 Rev 6
3/17
List of figures
TDA7385
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.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
4/17
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Components and top copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Bottom copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Quiescent output voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output power vs. supply voltage (4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Distortion vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Distortion vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Supply voltage rejection vs. frequency by varying C6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output noise vs. source resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Input/output biasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Diagnostics circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Clipping detection waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Diagnostics waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Fault detection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Doc ID 8160 Rev 6
TDA7385
Block and pin connection diagrams
Figure 1.
Block diagram
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Pin connection (top view)
Doc ID 8160 Rev 6
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5/17
Electrical specifications
TDA7385
2
Electrical specifications
2.1
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
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
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
Thermal data
Table 3.
Thermal data
Symbol
Rth j-case
2.3
Parameter
Thermal resistance junction-to-case
max.
Value
Unit
1
°C/W
Electrical characteristics
VS = 14.4 V; f = 1 kHz; Rg = 600 ; RL = 4 ;Tamb = 25 °C; Refer to the test and application
diagram (Figure 3), unless otherwise specified.
Table 4.
Symbol
Iq1
VOS
Gv
Po
Po max.
THD
6/17
Electrical characteristics
Parameter
Test condition
Min.
Typ.
Max.
Unit
Quiescent current
-
-
180
300
mA
Output offset voltage
-
-
-
100
mV
Voltage gain
-
25
26
27
dB
Output power
THD = 10%
THD = 1%
THD = 10%; VS = 13.2 V
THD = 1%; VS = 13.2 V
21
16.5
17
14
23
19
20
16
-
W
VS = 14.4 V
33
35
-
W
VS = 15.2 V
-
42
-
W
Po = 4 W
-
0.04
0.3
%
Max. output power (1)
Distortion
Doc ID 8160 Rev 6
TDA7385
Table 4.
Symbol
Electrical specifications
Electrical characteristics (continued)
Parameter
Test condition
Min.
Typ.
Max.
Unit
-
50
65
150
V
V
50
65
-
dB
20
-
Hz
-
kHz
eNo
Output noise
"A" Weighted
Bw = 20 Hz to 20 kHz
SVR
Supply voltage rejection
f = 100 Hz
fcl
Low cut-off frequency
-
-
fch
High cut-off frequency
-
75
Ri
Input impedance
-
70
100
-
k
CT
Cross talk
f = 1 kHz
50
70
-
dB
ISB
Standby current
consumption
Vstandby =0 V
-
-
15
µA
VSB out
Standby out threshold
voltage
(Amp: on)
3.5
-
-
V
VSB IN
Standby in threshold voltage (Amp: off)
-
-
1.5
V
AM
Mute attenuation
VO = 1Vrms
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
Im (L)
Muting pin current
VMUTE = 1.5V (source current)
5
10
16
A
ICDOFF
Clipping detector "off" output
THD = 1% (1)
average current
-
100
-
A
ICDON
Clipping detector "on" output
THD = 10% (1)
average current
100
240
350
A
1. Diagnostics output pulled-up to 5 V with 10 k series resistor.
Figure 3.
Standard test and application circuit
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Doc ID 8160 Rev 6
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7/17
Electrical specifications
2.4
TDA7385
PCB and component layout
Referred to Figure 3: Standard test and application circuit.
8/17
Figure 4.
Components and top copper layer
Figure 5.
Bottom copper layer
Doc ID 8160 Rev 6
TDA7385
Electrical specifications
2.5
Electrical characteristic curves
Figure 6.
Quiescent current vs. supply
voltage
Figure 7.
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supply voltage
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Figure 8.
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Output power vs. supply voltage
(4)
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Figure 9.
Distortion vs. output power
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Figure 10. Distortion vs. frequency
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Figure 11. Supply voltage rejection vs.
frequency by varying C6
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Doc ID 8160 Rev 6
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9/17
Electrical specifications
TDA7385
Figure 12. Output noise vs. source resistance Figure 13. Power dissipation and efficiency
vs. output power
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10/17
Doc ID 8160 Rev 6
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TDA7385
3
Application hints
Application hints
Referred to the circuit of Figure 3.
3.1
Biasing and SVR
As shown by Figure 14, all the TDA7385’s main sections, such as Inputs, Outputs AND ACGND (pin 16) are internally biased at half supply voltage level (Vs/2), which is derived from
the Supply Voltage Rejection (SVR) block. In this way no current flows through the internal
feedback network. The AC-GND is common to all the 4 amplifiers and represents the
connection point of all the inverting inputs.
Both individual inputs and AC-GND are connected to Vs/2 (SVR) by means of 100 k
resistors.
To ensure proper operation and high supply voltage rejection, it is of fundamental
importance to provide a good impedance matching between Inputs and AC-GROUND
terminations. This implies that C1, C2, C3, C4, C5 capacitors have to carry the same
nominal value and their tolerance should never exceed ± 10 %.
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 10µF.
Figure 14. Input/output biasing
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3.2
Input stage
The TDA7385’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.
Doc ID 8160 Rev 6
11/17
Application hints
3.3
TDA7385
Standby and muting
Standby and muting facilities are both 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 22, the maximum allowable
muting-series resistance (R2) is 70 k, which is sufficiently high to permit a muting capacitor
reasonably small (about 1µF).
If R2 is higher than recommended, the involved risk will be that the voltage at pin 22 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 2.5V/ms.
3.4
Diagnostics facility
The TDA7385 is equipped with a diagnostics circuitry able to detect the following events:
●
Clipping in the output stage
●
overheating (thermal shut-down proximity)
●
Output misconnections (OUT-GND and OUT-VS shorts)
Diagnostics information is available across an open collector output located at pin 25
(Figure 15) through a current sinking whenever at least one of the above events is
recognized.
Figure 15. Diagnostics circuit
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Among them, the Clipping Detector acts in a way to output a signal as soon as one or
more power transistors start being saturated.
As a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly
synchronized with each single clipping event in the music program and reflect the same
duration time (Figure 16). Applications making use of this facility usually operate a
filtering/integration of the pulses train through passive R-C networks and realize a volume
(or tone bass) stepping down in association with microprocessor-driven audioprocessors.
The maximum load that pin 25 can sustain is 1 k.
Due to its operating principles, the clipping detector has to be viewed mainly as a powerdependent feature rather than frequency-dependent. This means that clipping state will be
immediately signaled out whenever a fixed power level is reached, regardless of the audio
12/17
Doc ID 8160 Rev 6
TDA7385
Application hints
frequency. In other words, this feature offers the means to counteract the extremely sounddamaging effects of clipping, caused by a sudden increase of odd order harmonics and
appearance of serious inter-modulation phenomena.
Figure 16. Clipping detection waveforms
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Another possible kind of distortion control could be the setting of a maximum allowable THD
limit (e.g. 0.5%) over the entire audio frequency range. Besides offering no practical
advantages, this procedure cannot be much accurate, as the non-clipping distortion is likely
to vary over frequency.
In case of Overheating, pin 25 will signal out the junction temperature proximity to the
thermal shut-down threshold. This will typically start about 2°C before the thermal shutdown threshold is reached.
As various kind of diagnostics information is available at pin 25 (clipping, shorts and
overheating), it may be necessary to operate some distinctions on order to treat each event
separately. This could be achieved by taking into account the intrinsically different timing of
the diagnostics output under each circumstance.
In fact, clipping will produce pulses normally much shorter than those present under faulty
conditions. An example of circuit able to distinguish between the two occurrences is shown
by Figure 18.
3.5
Stability and layout considerations
If properly layouted and hooked to standard car-radio speakers, the TDA7385 will be
intrinsically stable with no need of external compensations such as output R-C cells. Due to
the high number of channels involved, this translates into a very remarkable components
saving if compared to similar devices on the market.
To simplify pc-board layout designs, each amplifier stage has its own power ground
externally accessible (pins 2,8,18,24) and one supply voltage pin for each couple of them.
Even more important, this makes it possible to achieve the highest possible degree of
separation among the channels, with remarkable benefits in terms of cross-talk and
distortion features.
About the layout grounding, it is particularly important to connect the AC-GND capacitor (C5)
to the signal GND, as close as possible to the audio inputs ground: this will guarantee high
rejection of any common mode spurious signals.
The SVR capacitor (C6) has also to be connected to the signal GND.
Supply filtering elements (C7, C8) have naturally to be connected to the power-ground and
located as close as possible to the Vs pins.
Doc ID 8160 Rev 6
13/17
Application hints
TDA7385
Pin 1, which is mechanically attached to the device’s tab, needs to be tied to the cleanest
power ground point in the pc-board, which is generally near the supply filtering capacitors.
Figure 17. Diagnostics waveforms
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Figure 18. Fault detection circuit
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Doc ID 8160 Rev 6
'!0'03
TDA7385
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 19. Flexiwatt25 mechanical data and package dimensions
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Doc ID 8160 Rev 6
15/17
Revision history
5
TDA7385
Revision history
Table 5.
16/17
Document revision history
Date
Revision
Changes
10-Mar-2001
1
Initial release.
13-Nov-2008
2
Document reformatted.
Added Features on page 1.
Updated Table 4: Electrical characteristics on page 6.
Updated Section 4: Package information on page 15.
09-Jan-2012
3
Modified Features on page 1;
Updated Table 4: Electrical characteristics.
14-Jun-2012
4
Updated Features on page 1;
Updated Table 4: Electrical characteristics.
26-Jul-2012
5
Updated Figure 17: Diagnostics waveforms on page 14.
16-Sep-2013
6
Updated Disclaimer.
Doc ID 8160 Rev 6
TDA7385
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Doc ID 8160 Rev 6
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