TDA7381
4 x 25W quad bridge car radio amplifier
Features
■
High output power capability:
– 4 x 30 W/4
Ω
max.
– 4 x 25 W/4
Ω
EIAJ
– 4 x 18 W/4
Ω
@ 14.4 V, 1 kHz, 10 %
– 4 x 15 W/4
Ω
@ 13.2 V, 1 kHz, 10 %
Clipping detector
Low distortion
Low output noise
St-by function
Mute function
Automute at min. supply voltage detection
Diagnostics facility for:
– Clipping
– Out to GND short
– Out to V
S
short
– Thermal shutdown
Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
■
■
■
■
Flexiwatt25
■
■
■
■
■
■
■
Load dump voltage
Fortuitous open GND
Reversed battery
ESD protection
Description
The TDA7381 is a class AB audio power amplifier
in Flexiwatt25 package designed for car radio
applications. Thanks to the fully complementary
PNP/NPN output configuration the TDA7381
allows a rail to rail output voltage swing with no
need of bootstrap capacitors..
The extremely reduced 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 Car- Radio assembly and wiring
in the car
■
Protections:
■
■
■
Output short circuit to GND, to V
S
, across the
load
Very inductive loads
Overrating chip temperature with soft thermal
limiter
Device summary
Order code
TDA7381
Table 1.
Package
Flexiwatt25
Packing
Tube
June 2008
Rev 6
1/13
www.st.com
13
Contents
TDA7381
Contents
1
2
Block / application diagram and pins connection diagram . . . . . . . . . . 3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
2.3
2.4
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Printed circuit board and component layout . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1
3.2
3.3
3.4
3.5
Biasing and SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Diagnostics facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Stability and layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
TDA7381
Block / application diagram and pins connection diagram
1
Block / application diagram and pins connection
diagram
Figure 1.
Block and application diagram
Vcc1
Vcc2
2.200μF
100nF
ST-BY
DIAGN. OUT
OUT1+
IN1
0.1μF
OUT1-
PW-GND
OUT2+
IN2
0.1μF
OUT2-
PW-GND
OUT3+
IN3
0.1μF
OUT3-
PW-GND
OUT4+
IN4
0.1μF
AC-GND
0.1μF
SVR
47μF
TAB
S-GND
OUT4-
PW-GND
MUTE
D93AU002C
Figure 2.
Pins connection diagram (top view)
1
25
D94AU117B
DIAGNOSTICS
OUT2-
OUT1-
OUT3-
OUT4-
P-GND1
AC-GND
P-GND3
P-GND4
P-GND
OUT2+
OUT4+
ST-BY
OUT1+
S-GND
OUT3+
MUTE
IN1
IN2
IN4
V
CC
IN3
TAB
SVR
V
CC
3/13
Electrical specifications
TDA7381
2
2.1
Electrical specifications
Absolute maximum ratings
Table 2.
Symbol
V
CC
V
CC (DC
)
V
CC (pk)
I
O
P
tot
T
j
T
stg
Absolute maximum ratings
Parameter
Operating supply voltage
DC supply voltage
Peak supply voltage (t = 50 ms)
Output peak current:
Repetitive (duty cycle 10 % at f = 10 Hz)
Non repetitive (t = 100
μs)
Power dissipation, (T
case
= 70 °C)
Junction temperature
Storage temperature
Value
18
28
50
3
4
80
150
-40 to 150
Unit
V
V
V
A
A
W
°C
°C
2.2
Thermal data
Table 3.
Symbol
R
th j-case
Thermal data
Parameter
Thermal resistance junction to case
max.
Value
1
Unit
°C/W
2.3
Table 4.
Electrical characteristcs
Electrical characteristcs
(V
S
= 14.4 V; f = 1 kHz; R
g
= 600
Ω;
R
L
= 4
Ω;
T
amb
= 25 °C; Refer to the test and application
circuit (Figure
3),
unless otherwise specified).
Parameter
Quiescent current
Output offset voltage
Voltage gain
THD = 10 %
THD = 1 %
P
o
Output power
THD = 10 %; V
S
= 13.2 V
THD = 1 %; V
S
= 13.2 V
EIAJ output power
(1)
Max. output power
(1)
Distortion
13.5
11
23
28
15
12
25
30
0.04
0.3
W
W
W
W
%
25
16.5
13
26
18
14
Test Condition
Min.
Typ.
180
Max.
300
100
27
Unit
mA
mV
dB
W
W
Symbol
I
q1
V
OS
G
v
P
o EIAJ
P
o max
THD
EIAJ (V
S
= 13.7 V)
V
S
= 13.7 V
P
o
= 4 W
4/13
TDA7381
Table 4.
Electrical specifications
Electrical characteristcs (continued)
(V
S
= 14.4 V; f = 1 kHz; R
g
= 600
Ω;
R
L
= 4
Ω;
T
amb
= 25 °C; Refer to the test and application
circuit (Figure
3),
unless otherwise specified).
Parameter
Output noise
Bw = 20 Hz to 20 kHz
Supply voltage rejection
Low cut-off frequency
High cut-off frequency
Input impedance
Cross talk
St-by current consumption
St-by out threshold voltage
St-by in threshold voltage
Mute attenuation
Mute out threshold voltage
Mute in threshold voltage
Muting pin current
Clipping detector "OFF"
output average current
Clipping Detector "ON"
Output Average Current
f = 1KHz
St-by = LOW
(Amp: ON)
(Amp: OFF)
V
O
= 1 Vrms
(Amp: play)
(Amp: mute)
V
MUTE
= 1.5 V; (source current)
THD = 1 %
(2)
THD = 10 %
(2)
100
5
10
100
240
350
80
3.5
1.5
16
90
3.5
1.5
75
70
50
100
70
100
f = 100 Hz
50
65
65
20
150
Test Condition
"A" Weighted
Min.
Typ.
50
Max.
Unit
μV
μV
dB
Hz
KHz
KΩ
dB
μA
V
V
dB
V
V
μA
μA
μA
Symbol
e
No
SVR
f
cl
f
ch
R
i
C
T
I
SB
V
SB out
V
SB IN
A
M
V
M out
V
M in
I
m (L)
I
CDOFF
I
CDON
1. Saturated square wave output.
2. Diagnostics output pulled-up to 5 V with 10 kΩ series resistor.
Figure 3.
Standard test and application circuit
C8
0.1μF
C7
2200μF
Vcc1-2
R1
ST-BY
10K
R2
MUTE
47K
C1
IN1
0.1μF
IN2
C2 0.1μF
IN3
C3 0.1μF
IN4
C4 0.1μF
S-GND
14
13
16
C5
0.1μF
SVR
C6
47μF
DIAGNOSTICS
10
25
1
TAB
D94AU179B
Vcc3-4
6
20
9
8
OUT1
4
C9
1μF
22
C10
1μF
11
7
5
2
3
OUT2
12
17
18
OUT3
15
19
21
24
23
OUT4
5/13
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