TDA7387
4 x 41 W quad bridge car radio amplifier
Datasheet - production data
Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
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Flexiwatt25
Flexiwatt25
(Vertical exposed pad)
Features
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
– Reversed battery
– ESD
Description
High output power capability:
– 4 x 41 W / 4 max.
The TDA7387 is an AB class audio power
amplifier, packaged in Flexiwatt 25 and designed
for high end car radio applications.
Low distortion
Low output noise
Standby function
Mute function
Automute at min. supply voltage detection
Based on a fully complementary PNP/NPN
configuration, the TDA7387 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
TDA7387
Flexiwatt25
Tube
TDA7387EP
Flexiwatt25 vertical, exposed pad
Tube
TDA7387EPAG
Flexiwatt25 vertical, exposed pad
Tube
September 2013
This is information on a product in full production.
DocID024094 Rev 2
1/15
www.st.com
1
Contents
TDA7387
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 characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1
Biasing and SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3
Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4
Stability and layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
DocID024094 Rev 2
TDA7387
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DocID024094 Rev 2
3/15
List of figures
TDA7387
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.
4/15
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
Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Input/output biasing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DocID024094 Rev 2
TDA7387
Block and pin connection diagrams
Figure 1. Block diagram
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Figure 2. Pin connection (top view)
DocID024094 Rev 2
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Block and pin connection diagrams
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5/15
Electrical specifications
TDA7387
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
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
Tamb
2.3
Parameter
Value
Unit
Thermal resistance junction-to-case max.
TDA7387
TDA7387EP/EPAG
1
1.3
°C/W
Operative temperature range TDA7387EP
-30 to +85
C
Operative temperature range TDA7387,TDA7387EPAG
-40 to +105
C
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. Electrical characteristics
Symbol
Test condition
Min.
Typ.
Max.
Unit
Quiescent current
-
-
180
300
mA
Output offset voltage
-
-
-
100
mV
Gv
Voltage gain
-
25
26
27
dB
Po
Output power
THD = 10%
THD = 1%
20
-
22
18
-
W
Iq1
VOS
6/15
Parameter
DocID024094 Rev 2
TDA7387
Electrical specifications
Table 4. Electrical characteristics (continued)
Symbol
Po max.
Parameter
Test condition
Max. output power (1)
Min.
Typ.
Max.
VS = 14.4 V
33
37
-
VS = 15.2 V
-
41
-
Unit
W
THD
Distortion
Po = 4 W
-
0.04
0.3
%
eNo
Output noise
"A" Weighted;
Bw = 20 Hz to 20 kHz
-
50
65
150
V
V
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
-
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
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 = 1.5 V (source current)
5
10
16
µA
AM
1. Saturated square wave output.
Figure 3. Standard test and application circuit
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Electrical specifications
2.4
TDA7387
PCB and component layout
Refer to Figure 3: Standard test and application circuit.
Figure 4. Components and top copper layer
Figure 5. Bottom copper layer
8/15
DocID024094 Rev 2
TDA7387
2.5
Electrical specifications
Electrical characteristics curves
Figure 6. Quiescent current vs. supply voltage
Figure 7. Quiescent output voltage vs. supply
voltage
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Figure 8. Output power vs. supply voltage (4)
Figure 9. Distortion vs. output power
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Figure 10. Distortion vs. frequency
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Figure 11. Power dissipation and efficiency vs.
output power
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Application hints
3
TDA7387
Application hints
Refer to Figure 3.
3.1
Biasing and SVR
As shown in Figure 12, all the TDA7387’s main sections, such as Inputs, Outputs AND ACGND (pin 16) are internally biased at half supply voltage level (Vs/2), coming 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 controls 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 12. Input/output biasing.
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3.2
Input stage
The TDA7387’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
turns out to be 16 Hz.
10/15
DocID024094 Rev 2
TDA7387
3.3
Application hints
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
used 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 allow 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 rise to
above the 1.5 V threshold voltage and the device is 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.
3.4
Stability and layout considerations
If properly layouted and hooked to standard car-radio speakers, the TDA7387 is 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 design, 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 guarantees high
rejection of any common mode spurious signal.
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.
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.
The exposed pad package doesn't require any particular care compared to the ST standard
flexiwatt package. For particular PCB configurations, in order to maximize the rejection
against any disturbances coming from the battery line (SVR), it is suggested to use one of
the following IC metal slug (heat-sink) connections:
leave the slug simply electrically isolated from the PCB ground;
in case of 2 layers board, connect the slug to the PCB power ground (P-GND) and not
to the signal ground (S-GND);
in case of a PCB with a layer dedicated to grounding (wide / diffused GND area with no
distinction between P-GND and S-GND) connect the slug to the common board
ground.
DocID024094 Rev 2
11/15
Package information
4
TDA7387
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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12/15
DocID024094 Rev 2
TDA7387
Package information
Figure 14. Flexiwatt25 mechanical data and package dimensions
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