tda7376b, Ham- CB Radio, Karty katalogowe
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TDA7376B
2 x 25W POWER AMPLIFIER FOR CAR RADIO
PRELIMINARY DATA
, 1KHz, 10%)
(2 x 20W min. @ 14.4V, 4
W
, 1KHz, 10%)
DIFFERENTIAL INPUTS
MINIMUM EXTERNAL COMPONENT COUNT
INTERNALLY FIXED GAIN (26dB)
MUTE FUNCTION (CMOS COMPATIBLE)
AUTOMUTE AT MINIMUM SUPPLY VOLT-
AGE DETECTION
STAND-BY FUNCTION
NO AUDIBLE POP DURING MUTE AND ST-
BY OPERATIONS
CLIPPING DETECTOR WITH PROGRAMMA-
BLE DISTORTION THRESHOLD
W
MULTIWATT15
ORDERING NUMBER:
TDA7376B
DESCRIPTION
The TDA7376B is a new technology dual bridge
Audio Amplifier in Multiwatt 15 package designed
for car radio applications. Thanks to the fully com-
plementary PNP/NPN output stage configuration
the TDA7376B delivers a rail-to-rail voltage swing
with no need of bootstrap capacitors. Differential
input pairs, that will accept either single ended or
differential input signals, guarantee high noise im-
munity making the device suitable for both car ra-
dio and car boosters applications.
The audio mute control, that attenuates the out-
put signal of the audio amplifiers, suppresses pop
on - off transients and cuts any noises coming
from previous stages. The St-By control, that de-
biases the amplifiers, reduces the cost of the
power switch. The on-board programmable distor-
tion detector allows compression facility when-
ever the ampifier is overdriven, so limiting the dis-
tortion at any levels inside the presettable range.
PROTECTIONS:
SHORT CIRCUIT (OUT TO GROUND, OUT
TO SUPPLY VOLTAGE, ACROSS THE
LOAD)
OVERRATING CHIP TEMPERATURE WITH
SOFT THERMAL LIMITER
LOAD DUMP VOLTAGE
FORTUITOUS OPEN GROUND
LOUDSPEAKER DC CURRENT
ESD
PIN CONNECTION
(Continued)
April 1996
1/9
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
HIGH OUTPUT POWER CAPABILITY
(2 x 25W typ. @ 14.4V, 4
TDA7376B
BLOCK DIAGRAM
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 (t = 50ms)
50
V
I
O
Output Peak Current (non rep. t = 100
m
s)
4.5
3.5
A
A
Output Peak Current (rep. f > 10Hz)
P
tot
Power Dissipation at T
case
=85
°
C
36
W
T
stg,
T
j
Storage and Junction Temperature
–40 to 150
°
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-case
Thermal Resistance Junction-case
max.
1.8
°
C/W
2/9
TDA7376B
Figure 1:
Differential Inputs Test and Application Circuit
1
m
F
Figure 2:
Single Ended Inputs Test and Application Circuit
1
m
F
3/9
TDA7376B
Figure 3:
Application Board Reference Circuit
1
m
F
Figure 4
: P.C. Board and Components Layout of the Circuit of Fig. 3 (1:1 scale)
4/9
TDA7376B
ELECTRICAL CHARACTERISTICS
(Refer to the test fig. 1 and 2 circuit, T
amb
=25
°
C; V
S
= 14.4V;
f = 1KHz; R
L
=4
; unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
8
18
V
I
d
Total Quiescent Drain Current
R
L
=
8
200
mA
V
OS
Output Offset Voltage
120
mV
P
O
Output Power
d = 10%
20
25
W
d
Distortion
P
O
= 0.5 to 10W
0.03
0.3
%
C
T
Cross Talk
f = 1KHz; Rg = 0
f = 10KHz; Rg = 0
80
70
dB
dB
R
IN
Input Resistance
differential input
single ended input
45
40
K
W
K
W
G
V
Voltage Gain
differential input
single ended input
25
25
26
26
27
27
dB
dB
D
G
V
Channel Gain Balance
1
dB
E
N
Input Noise Voltage
Rg = 600
W
; ”A Weighted”
3
4
m
V
Rg = 600
W
; 22Hz to 22KHz
6
m
V
SVR
Supply Voltage Rejection
f = 100Hz; Vr = 1Vrms;
Rg = 0
f = 10KHz; Vr = 1Vrms;
Rg = 0
45
dB
55
dB
BW
Power Bandwidth
(–3dB)
75
KHz
CMRR
Common Mode Rejection Ratio V
CM
= 1Vrms input referred
60
dB
A
SB
Stand-by Attenuation
V
SB
= 1.5V; P
Oref
=1W
90
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
m
A
A
M
Mute Attenuation
V
M
= 1.5V; P
Oref
=1W
85
dB
V
MIN
Mute in Threshold
1.5
V
V
M OUT
Mute out Threshold
3.5
V
I
6
Mute pin Current
V6 = 0 to V
S
,; V
S max.
= 18V
100
m
A
D
DL
Distortion Detection Level (*)
3.5
%
D
DOUT
Distortion Detector Output DC
Current
Output low, sinked current
(V
pin10
= 1.5V)
1
mA
Output high, leakage current
(V
pin10
=V
S
,@V
Smax
= 18V)
10
m
A
(*) see figure 5 for THD setting.
The TDA7376B is equipped with a programmable
clipping distortion detector circuitry that allows to
signal out the output stage saturation by providing
a current sinking into an open collector output
(DDout) when the total harmonic distortion of the
output signal reaches the preset level. The de-
sired threshold is fixed through an external divider
that produces a proper voltage level across the
THD set pin. Fig. 5 shows the THD detection
threshold versus the THD set voltage. Since it is
essential that the THD set voltage be proportional
to the supply voltage, fig. 5 shows its value as a
fraction of V
CC
. The actual voltage can be com-
puted by multiplying the fraction corresponding to
the desired THD threshold by the application’s
supply voltage.
5/9
W
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