TDA7385
4 x 30W QUAD BRIDGE CAR RADIO AMPLIFIER
HIGH OUTPUT POWER CAPABILITY:
4 x 35W/4
MAX.
4 x 30W/4
EIAJ
4 x 22W/4
@ 14.4V, 1KHz, 10%
4 x 18.5W/4
@ 13.2V, 1KHz, 10%
CLIPPING DETECTOR
LOW DISTORTION
LOW OUTPUT NOISE
ST-BY FUNCTION
MUTE FUNCTION
AUTOMUTE AT MIN. SUPPLY VOLTAGE DE-
TECTION
DIAGNOSTICS FACILITY FOR:
CLIPPING
OUT TO GND SHORT
OUT TO V
S
SHORT
THERMAL SHUTDOWN
LOW EXTERNAL COMPONENT COUNT:
INTERNALLY FIXED GAIN (26dB)
NO EXTERNAL COMPENSATION
NO BOOTSTRAP CAPACITORS
PROTECTIONS:
OUTPUT SHORT CIRCUIT TO GND, TO V
S
,
ACROSS THE LOAD
VERY INDUCTIVE LOADS
OVERRATING CHIP TEMPERATURE WITH
SOFT THERMAL LIMITER
LOAD DUMP VOLTAGE
FORTUITOUS OPEN GND
REVERSED BATTERY
ESD PROTECTION
DESCRIPTION
The TDA7385 is a new technology class AB
Audio Power Amplifier in Flexiwatt 25 package
October 1999
ORDERING NUMBER: TDA7385
IN1
0.1
F
MUTE
ST-BY
IN2
0.1
F
OUT1+
OUT1-
OUT2+
OUT2-
PW-GND
IN3
0.1
F
IN4
0.1
F
OUT3+
OUT3-
OUT4+
OUT4-
PW-GND
PW-GND
PW-GND
D93AU002C
AC-GND
0.1
F
47
F
SVR
TAB
S-GND
Vcc1
Vcc2
100nF
2.200
F
DIAGN. OUT
BLOCK AND APPLICATION DIAGRAM
FLEXIWATT25
1/12
designed for high end car radio applications.
D94AU117B
TAB
P-GND
OUT2-
ST-BY
OUT2+
V
CC
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
V
CC
OUT4+
MUTE
OUT4-
P-GND4
DIAGNOSTICS
1
25
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Operating Supply Voltage
18
V
V
CC (DC)
DC Supply Voltage
28
V
V
CC (pk)
Peak Supply Voltage (t = 50ms)
50
V
I
O
Output Peak Current:
Repetitive (Duty Cycle 10% at f = 10Hz)
Non Repetitive (t = 100
s)
4.5
5.5
A
A
P
tot
Power dissipation, (T
case
= 70
C)
80
W
T
j
Junction Temperature
150
C
T
stg
Storage Temperature
55 to 150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-case
Thermal Resistance Junction to Case
Max.
1
C/W
Thanks to the fully complementary PNP/NPN out-
put configuration the TDA7385 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.
DESCRIPTION (continued)
TDA7385
2/12
ELECTRICAL CHARACTERISTICS (V
S
= 14.4V; f = 1KHz; R
g
= 600
; R
L
= 4
; T
amb
= 25
C;
Refer to the Test and application circuit (fig.1), unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
q1
Quiescent Current
180
300
mA
V
OS
Output Offset Voltage
100
mV
G
v
Voltage Gain
25
26
27
dB
P
o
Output Power
THD = 10%
THD = 1%
THD = 10%; V
S
= 14V
THD = 5%; V
S
= 14V
THD = 1%; V
S
= 14V
THD = 10%; V
S
= 13.2V
THD = 1%; V
S
= 13.2V
20
16.5
19
17
16
17
14
22
18
21
19
17
18.5
15
W
W
W
W
W
W
W
P
o EIAJ
EIAJ Output Power (*)
VS = 13.7V
27.5
30
W
P
o max.
Max. Output Power (*)
V
S
= 14.4V
33
35
W
THD
Distortion
P
o
= 4W
0.04
0.3
%
e
No
Output Noise
"A" Weighted
Bw = 20Hz to 20KHz
50
65
150
V
V
SVR
Supply Voltage Rejection
f = 100Hz
50
65
dB
f
cl
Low Cut-Off Frequency
20
Hz
f
ch
High Cut-Off Frequency
75
KHz
R
i
Input Impedance
70
100
K
C
T
Cross Talk
f = 1KHz
50
70
dB
I
SB
St-By Current Consumption
St-By = LOW
100
A
V
SB out
St-By OUT Threshold Voltage
(Amp: ON)
3.5
V
V
SB IN
St-By IN Threshold Voltage
(Amp: OFF)
1.5
V
A
M
Mute Attenuation
V
O
= 1Vrms
80
90
dB
V
M out
Mute OUT Threshold Voltage
(Amp: Play)
3.5
V
V
M in
Mute IN Threshold Voltage
(Amp: Mute)
1.5
V
I
m (L)
Muting Pin Current
V
MUTE
= 1.5V
(Source Current)
5
10
16
A
I
CDOFF
Clipping Detector "OFF" Output
Average Current
THD = 1% (**)
100
A
I
CDON
Clipping Detector "ON" Output
Average Current
THD = 10% (**)
100
240
350
A
(*) Saturated square wave output.
(**) Diagnostics output pulled-up to 5V with 10K
series resistor.
TDA7385
3/12
IN1
0.1
F
C9
1
F
IN2
C2 0.1
F
OUT1
OUT2
IN3
C3 0.1
F
IN4
C4 0.1
F
OUT3
OUT4
D94AU179B
C5
0.1
F
C6
47
F
SVR
TAB
Vcc1-2
Vcc3-4
C8
0.1
F
C7
2200
F
C10
1
F
ST-BY
R1
10K
R2
47K
MUTE
C1
14
15
12
11
22
4
13
S-GND
16
10
25
1
DIAGNOSTICS
6
20
9
8
7
5
2
3
17
18
19
21
24
23
Figure 1: Standard Test and Application Circuit
TDA7385
4/12
TDA7385
Figure 2: P.C.B. and component layout of the figure 1 (1:1 scale)
COMPONENTS &
TOP COPPER LAYER
BOTTOM COPPER LAYER
TDA7385
5/12
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