TDA7350A
22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO
VERY FEW EXTERNAL COMPONENTS
NO BOUCHEROT CELLS
NO BOOSTRAP CAPACITORS
HIGH OUTPUT POWER
NO SWITCH ON/OFF NOISE
VERY LOW STAND-BY CURRENT
FIXED GAIN (30dB STEREO)
PROGRAMMABLE TURN-ON DELAY
Protections:
OUTPUT
AC-DC
SHORT
CIRCUIT
TO
GROUND AND TO SUPPLY VOLTAGE
VERY INDUCTIVE LOADS
LOUDSPEAKER PROTECTION
OVERRATING CHIP TEMPERATURE
LOAD DUMP VOLTAGE
FORTUITOUS OPEN GROUND
ESD
DESCRIPTION
The TDA7350A is a new technology class AB
Audio Power Amplifier in the Multiwatt
package
designed for car radio applications.
Thanks to the fully complementary PNP/NPN out-
put configuration the high power performance of
the TDA7350A is obtained without bootstrap ca-
pacitors.
A delayed turn-on mute circuit eliminates audible
on/off noise, and a novel short circuit protection
system prevents spurious intervention with highly
inductive loads.
April 1995
APPLICATION CIRCUIT BRIDGE
MULTIWATT 11
ORDERING NUMBER: TDA7350A
1/22
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Test Conditions
Unit
V
S
Operating Supply Voltage
18
V
V
S
DC Supply Voltage
28
V
V
S
Peak Supply Voltage (for t = 50ms)
40
V
I
o
Output Peak Current (non rep. for t = 100
s)
5
A
I
o
Output Peak Current (rep. freq. > 10Hz)
4
A
P
tot
Power Dissipation at T
case
= 85
C
36
W
T
stg,TJ
Storage and Junction Temperature
-40 to 150
C
THERMAL DATA
Symbol
Description
Value
Unit
R
thj-case
Thermal Resistance Junction-case
Max
1.8
C/W
TDA7350A
2/22
ELECTRICAL CHARACTERISTICS (Refer to the test circuits, T
amb
= 25
C, V
S
= 14.4V, f = 1KHz unless
otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage Range
8
18
V
I
d
Total Quiescent Drain Current
stereo configuration
120
mA
A
SB
Stand-by attenuation
60
80
dB
I
SB
Stand-by Current
100
A
T
sd
Thermal Shut-down Junction
Temperature
150
C
STEREO
P
o
Output Power (each channel)
d = 10%
R
L
= 2
R
L
= 3.2
R
L
= 4
d = 10%; V
S
= 13.2V
R
L
= 2
R
L
= 3.2
R
L
= 4
7
11
8
6.5
9
6.5
5.5
W
W
W
W
W
W
d
Distortion
P
o
= 0.1 to 4W; R
L
= 3.2
0.5
%
SVR
Supply Voltage Rejection
R
g
= 10k
C3 = 22
F
f = 100Hz
C3 = 100
F
45
50
57
dB
CT
Crosstalk
f = 1KHz
f = 10KHz
45
55
50
dB
dB
R
I
Input Resistance
30
50
K
G
V
Voltage Gain
27
29
31
dB
G
V
Voltage Gain Match
1
dB
E
IN
Input Noise Voltage
R
g
= 50
(*)
R
g
= 10K
(*)
R
g = 50
(**)
R
g
= 10K
(**)
1.5
2
2
2.7
7
V
V
V
V
BRIDGE
P
o
Output Power
d = 10%; R
L
= 4
d = 10%; R
L
= 3.2
d = 10%; V
S
= 13.2V
R
L
= 4
R
L
= 3.2
16
20
22
17.5
19
W
W
W
W
d
Distortion
P
o
= 0.1 to 10W; R
L
= 4
1
%
V
OS
Output Offset Voltage
250
mV
SVR
Supply Voltage Rejection
R
g
= 10K
C3 = 22
F
f = 100Hz
C3 = 100
F
45
50
57
dB
R
I
Input Resistance
50
K
G
V
Voltage Gain
33
35
37
dB
E
IN
Input Noise Voltage
R
g
= 50
(*)
R
g = 10K
(*)
R
g
= 50
(**)
R
g
= 10K
(**)
2
2.5
2.7
3.2
V
V
V
V
(*) Curve A
(**) 22Hz to 22KHz
TDA7350A
3/22
Figure 1: STEREO Test and Appication Circuit
Figure 2: P.C. Board and Layout (STEREO) of the circuit of fig. 1 (1:1 scale)
1000
F
220
F
1000
F
220
F
TDA7350A
4/22
Figure 3: BRIDGE Test and Appication Circuit
Figure 4: P.C. Board and Layout (BRIDGE) of the circuit of fig. 3 (1:1 scale)
TDA7350A
5/22
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