TDA7454
4 x 35W HIGH EFFICIENCY QUAD BRIDGE
CAR RADIO AMPLIFIER
HIGH OUTPUT POWER CAPABILITY:
4 x 40W/4
MAX.
4 x 35W/4
EIAJ.
4 x 25W/4
@14.4V, 1KHz, 10%
4 x 60W/2
MAX.
2
DRIVING CAPABILITY
DUAL MODE OPERATING EXTERNALLY
PRESETTABLE: CONVENTIONAL CLASS A-
B MODE, HIGH EFFICIENCY MODE
LOW EXTERNAL COMPONENTS COUNT:
NO BOOTSTRAP CAPACITORS
NO EXTERNAL COMPENSATION
INTERNALLY FIXED GAIN (26dB)
CLIPPING DETECTOR
ST-BY FUNCTION (CMOS COMPATIBLE)
MUTE FUNCTION (CMOS COMPATIBLE)
AUTOMUTE AT MINIMUM SUPPLY
VOLTAGE DETECTION
LOW RADIATION
Protections:
OUPUT SHORT CIRCUIT
TO GND; TO V
S
; ACROSS THE LOAD
3 STEPS OVERRATING CHIP TEMPERA-
TURE WITH THERMAL WARNING
LOAD DUMP VOLTAGE
FORTUITOUS OPEN GND
LOUDSPEAKER DC CURRENT
ESD
DESCRIPTION
The TDA7454 is a new BCD technology QUAD
BRIDGE type of car radio amplifier in Flexiwatt25
packagespecially intendedfor car radio applications.
Among the features, its superior efficiency per-
formance coming from the internal exclusive
structure, makes it the most suitable device to
simplify the thermal management in high power
sets. The dissipated output power under average
listening condition is in fact reduced up to 50%
when compared to the level provided by conven-
tional class AB solutions.
October 1999
Flexiwatt 25
7
8
9
-
+
5
2
3
+
-
19
18
17
21
24
23
-
+
+
-
RIGHT FRONT
RIGHT REAR
LEFT FRONT
LEFT REAR
SVR
11
12
15
14
MUTE
22
ST-BY
4
IN LEFT
REAR
IN LEFT
FRONT
100
F
IN RIGHT
FRONT
IN RIGHT
REAR
0.22
F
0.22
F
0.22
F
0.22
F
10
CD
25
1
TAB
13
S-GND
STD/HI- EFF
16
VCC2
VCC1
VCC
20
6
D94AU172C
BLOCK & APPLICATION DIAGRAM
MULTIPOWER BCD TECHNOLOGY
1/13
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
op
Operating Supply Voltage
18
V
V
S
DC Supply Voltage
28
V
V
peak
Peak Supply Voltage (for t = 50ms)
40
V
I
O
Output Peak Current (not repetitive t = 100
s)
8
A
I
O
Output Peak Current (repetitive f > 10Hz)
6
A
P
tot
Power Dissipation T
case
= 70
C
86
W
T
stg
, T
j
Storage and Junction Temperature
-55 to 150
C
THERMAL DATA
Symbol
Description
Value
Unit
R
th j-case
Thermal Resistance Junction-case
Max
1
C/W
D94AU173A
TAB
PW GND RR
OUT RR-
ST-BY
OUT RR+
V
CC1
OUT RF-
PW GND RF
OUT RF+
SVR
IN RF
IN RR
S GND
IN LR
IN LF
STD/HEFF
OUT LF+
PW GND LF
OUT LF-
V
CC2
OUT LR+
MUTE
OUT LR-
PW GND LR
CD
1
25
2
3
4
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
23
24
PIN CONNECTION (Top view)
TDA7454
2/13
ELECTRICAL CHARACTERISTICS (Refer to the test circuit V
S
= 14.4V; R
L
= 4
; f = 1KHz;
T
amb
= 25
C, 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
60
140
250
mA
P
o
Output Power
THD = 10%
THD = 1%
THD = 10% RL = 2
;
THD = 1% R
L
= 2
;
23
18
40
28
25
20
42
30
W
W
W
W
P
o EIAJ
EIAJ Output Power (*)
Vs = 13.7V
Vs = 13.7V, RL = 2
32
50
35
52
W
W
P
o max.
Max. Output Power (*)
Vs = 14.4V
Vs = 14.4V, RL = 2
38
55
40
60
W
W
THD
Total harmonic distortion
P
O
= 1W to 10W; STD MODE
P
O
= 1W; HE MODE
P
O
= 10W; HE MODE
0.03
0.04
0.1
0.3
0.3
0.5
%
%
%
R
L
= 2
; HE MODE; P
O
= 3W
R
L
= 2
; HE MODE; P
O
= 15W
0.06
0.15
0.3
0.5
%
%
C
T
Cross Talk
f = 1KHz to 10KHz
45
55
dB
R
IN
Input Impedance
11
15
19
K
G
V
Voltage Gain
25
26
27
dB
G
V
Voltage Gain Match
1
dB
E
IN
Output Noise Voltage
R
g
= 600
100
150
mV
SVR
Supply Voltage Rejection
f = 300Hz; Vr = 1Vrms;
R
g
= 0 to 100
;
45
52
dB
BW
Power Bandwidth
(3dB)
75
KHz
A
SB
Stand-by Attenuation
90
100
dB
V
sb IN
Stand-by in Threshold
1.5
V
V
sb OUT
Stand-by out Threshold
3.5
V
I
sb
Stand-by Current Consumption
100
A
A
M
Mute Attenuation
80
90
dB
V
M IN
Mute in Thereshold
1.5
V
V
M OUT
Mute out Threshold
3.5
V
I
M
Mute pin Current (Sourced)
V = 0 to V
S
V
S max
= 18V
-10
1
10
A
Mode Select Switch
Standard BTL Mode Op. (V
pin 16
)
Open
High Efficiency Mode (V
pin 16
)
0.5
V
CD
Clip Det. out Current
(Pull up to 5V with 10K
)
CD off: P
Omin
= 10W
CD on: THD = 5%
150
5
A
A
(*) Saturated square wave output.
TDA7454
3/13
Figure 2: P.C.B. and components layout of fig. 1 circuit. (1.25 :1 scale)
COMPONENTS &
TOP COPPER LAYER
BOTTOM COPPER LAYER
TDA7454
5/13
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