tda7385.pdf
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TDA7385
4 x 37 W quad bridge car radio amplifier
Features
High output power capability:
–
■
4 x 37 W / 4
Ω
max.
–
4 x 23 W / 4
Ω
@ 14.4 V, 1 kHz, 10 %
Clipping detector
■
Low distortion
■
Low output noise
■
Standby function
Flexiwatt25
■
Mute function
■
Automute at min. supply voltage detection
■
Diagnostics facility for:
–
■
Clipping
Reversed battery
■
–
Out to GND short
ESD
–
Out to V
S
short
■
–
Thermal shutdown
Description
Low external component count:
–
■
Internally fixed gain (26 dB)
The TDA7385 is an AB class audio power
amplifier, packaged in Flexiwatt 25 and designed
for high end car radio applications.
–
No external compensation
–
No bootstrap capacitors
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.
Protections
Output short circuit to GND, to V
S
, across the
load
■
Very inductive loads
■
The on-board clipping detector simplifies gain
compression operations. The fault diagnostics
makes it possible to detect mistakes during car-
radio assembly and wiring in the car.
Overrating chip temperature with soft thermal
limiter
■
Load dump voltage
■
Fortuitous open GND
■
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
).
November 2008
Rev 2
1/17
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
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
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 (4
Ω
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
TDA7385
Block and pin connection diagrams
1
Block and pin connection diagrams
Figure 1.
Block diagram
Vcc1
Vcc2
2.200
F
100nF
μ
ST-BY
DIAGN. OUT
MUTE
OUT1+
OUT1-
IN1
0.1
μ
F
PW-GND
OUT2+
OUT2-
IN2
0.1
μ
F
PW-GND
OUT3+
OUT3-
IN3
0.1
μ
F
PW-GND
OUT4+
OUT4-
IN4
0.1
μ
F
PW-GND
AC-GND
0.1
SVR
TAB
S-GND
μ
F
47
μ
F
D93AU002C
Figure 2.
Pin connection (top view)
1
25
D94AU117C
5/17
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