TDA7385

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 23 W / 4 Ω @ 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
– Reversed battery
– Out to GND short
– ESD
– Out to VS short
– Thermal shutdown
■ Low external component count:
Description
– Internally fixed gain (26 dB) The TDA7385 is an AB class audio power
– No external compensation amplifier, packaged in Flexiwatt 25 and designed
– No bootstrap capacitors for high end car radio applications.

■ Protections: Based on a fully complementary PNP/NPN

– Output short circuit to GND, to VS, across configuration, the TDA7385 allows a rail to rail
the load output voltage swing with no need of bootstrap
capacitors. The extremely reduced boundary
– Very inductive loads
components count allows very compact sets.
– Overrating chip temperature with soft
thermal limiter The on-board clipping detector simplifies gain
– Load dump voltage compression operations. The fault diagnostics
makes it possible to detect mistakes during car-
– Fortuitous open GND
radio assembly and wiring in the car.

Table 1. 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).

July 2012 Doc ID 8160 Rev 5 1/17

This is information on a product in full production. www.st.com 1
Contents TDA7385

Contents

1 Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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

3 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 5

TDA7385 List of tables

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Doc ID 8160 Rev 5 3/17

List of figures TDA7385

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. Components and top copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Bottom copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 7. Quiescent output voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 8. Output power vs. supply voltage (4Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. Distortion vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10. Distortion vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 11. Supply voltage rejection vs. frequency by varying C6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 12. Output noise vs. source resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13. Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 14. Input/output biasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 15. Diagnostics circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 16. Clipping detection waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 17. Diagnostics waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 18. Fault detection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 19. Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4/17 Doc ID 8160 Rev 5

TDA7385 Block and pin connection diagrams

1 Block and pin connection diagrams

Figure 1. Block diagram

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Doc ID 8160 Rev 5 5/17

Electrical specifications TDA7385

2 Electrical specifications

2.1 Absolute maximum ratings

Table 2. Absolute maximum ratings
Symbol Parameter Value Unit

VS 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:
IO Repetitive (duty cycle 10 % at f = 10 Hz) 4.5 A
Non repetitive (t = 100 µs) 5.5 A
Ptot Power dissipation, (Tcase = 70 °C) 80 W
Tj Junction temperature 150 °C
Tstg Storage temperature – 55 to 150 °C

2.2 Thermal data

Table 3. Thermal data
Symbol Parameter Value Unit

Rth j-case Thermal resistance junction-to-case max. 1 °C/W

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 3), unless otherwise specified.

Table 4. Electrical characteristics

Symbol Parameter Test condition Min. Typ. Max. Unit

Iq1 Quiescent current - - 180 300 mA

VOS Output offset voltage - - - 100 mV
Gv Voltage gain - 25 26 27 dB
THD = 10% 21 23
THD = 1% 16.5 19
Po Output power - W
THD = 10%; VS = 13.2 V 17 20
THD = 1%; VS = 13.2 V 14 16
VS = 14.4 V 33 35 - W
Po max. Max. output power (1)
VS = 15.2 V - 42 - W
THD Distortion Po = 4 W - 0.04 0.3 %

6/17 Doc ID 8160 Rev 5

TDA7385 Electrical specifications

Table 4. Electrical characteristics (continued)

Symbol Parameter Test condition Min. Typ. Max. Unit

"A" Weighted 50 - μV
eNo Output noise -
Bw = 20 Hz to 20 kHz 65 150 μV
SVR Supply voltage rejection f = 100 Hz 50 65 - dB
fcl Low cut-off frequency - - 20 - Hz
fch High cut-off frequency - 75 - kHz
Ri Input impedance - 70 100 - kΩ
CT Cross talk f = 1 kHz 50 70 - dB
Standby current
ISB Vstandby =0 V - - 15 µA
consumption
Standby out threshold
VSB out (Amp: on) 3.5 - - V
voltage
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 μA
Clipping detector "off" output
ICDOFF THD = 1% (1) - 100 - μA
average current
Clipping detector "on" output
ICDON THD = 10% (1) 100 240 350 μA
average current
1. Diagnostics output pulled-up to 5 V with 10 kΩ series resistor.

Figure 3. Standard test and application circuit

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Doc ID 8160 Rev 5 7/17

Electrical specifications TDA7385

2.4 PCB and component layout

Referred to Figure 3: Standard test and application circuit.

Figure 4. Components and top copper layer

Figure 5. Bottom copper layer

8/17 Doc ID 8160 Rev 5

TDA7385 Electrical specifications

2.5 Electrical characteristic curves

Figure 6. Quiescent current vs. supply Figure 7. Quiescent output voltage vs.
voltage supply voltage
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Figure 8. Output power vs. supply voltage Figure 9. Distortion vs. output power
(4Ω)

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Figure 10. Distortion vs. frequency Figure 11. Supply voltage rejection vs.
frequency by varying C6

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Doc ID 8160 Rev 5 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 5

TDA7385 Application hints

3 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 AC-
GND (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 kΩ
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 5 11/17

Application hints TDA7385

3.3 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 kΩ, 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 kΩ.
Due to its operating principles, the clipping detector has to be viewed mainly as a power-
dependent 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 5

TDA7385 Application hints

frequency. In other words, this feature offers the means to counteract the extremely sound-
damaging 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 shut-
down 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 5 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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14/17 Doc ID 8160 Rev 5

TDA7385 Package information

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 19. Flexiwatt25 mechanical data and package dimensions

MM INCH
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Doc ID 8160 Rev 5 15/17

Revision history TDA7385

5 Revision history

Table 5. Document revision history

Date Revision Changes

10-Mar-2001 1 Initial release.

Document reformatted.
Added Features on page 1.
13-Nov-2008 2
Updated Table 4: Electrical characteristics on page 6.
Updated Section 4: Package information on page 15.
Modified Features on page 1;
09-Jan-2012 3
Updated Table 4: Electrical characteristics.
Updated Features on page 1;
14-Jun-2012 4
Updated Table 4: Electrical characteristics.
26-Jul-2012 5 Updated Figure 17: Diagnostics waveforms on page 14.

16/17 Doc ID 8160 Rev 5

TDA7385

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Doc ID 8160 Rev 5 17/17

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