®
2 x 35W POWER AMPLIFIER FOR CAR RADIO
HIGH OUTPUT POWER CAPABILITY:
2 x 40W max./4Ω
2 x 35W/4Ω EIAJ
2 x 25W4Ω @ 14.4V, 1KHz, 10%
2 x 37W2Ω @ 14.4V, 1KHz, 10%
2Ω DRIVING
DIFFERENTIAL INPUTS
MINIMUM EXTERNAL COMPONEN T COUNT
INTERNALLY FIXED GAIN (26dB)
MUTE FUNCTION (CMOS COMPAT IBLE)
AUTOMUTE AT MINIMUM SUPPLY VOLT-
AGE DETECTION
STAND-BY FUNCTION
NO AUDIBLE POP DURING MUTE AND ST-
BY OPERATIONS
CLIPPING DETE CTOR WITH PROGRAMMA-
BLE DISTORTION THR ESHOLD
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 CURRE NT
ESD
TDA7376B
MULTIWATT15
ORDERING NUMBER:
DESCRIPTION
The TDA7376B is a new technology dual bridge
Audio Amplifier in Multiwatt 15 package designed
for car radio applications. Thanks to the fully complementary PNP/NPN output stage configuration
the TDA7376B delivers a rail-to-rail voltage swing
with no need of boo tstrap capacitors. Differential
input pairs, that will accept either singl e ended or
differential input signals, guarantee high noise immunity making the device suitable for both car radio and car boosters applications.
The audio mute control, t hat attenuates the output signal of the audio amplifiers, suppresses pop
on - off transients and cuts any noises coming
from previous stages. The St-By control, that debiases the amplifiers, reduces the cost of the
power switch. The on-board programmable distortion detector allows compression facility whenever the ampifier is overdriven, so limiting the distortion at any levels inside the presettable range.
TDA7376B
PIN CONNECTION (Continued)
May 2000
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/9
TDA7376B
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
OP
V
S
V
peak
I
O
P
tot
T
stg, Tj
Operating Supply Voltage 18 V
DC Supply Voltage 28 V
Peak Supply Voltage (t = 50ms) 50 V
Output Peak Current (non rep. t = 100µs)
Output Peak Current (rep. f > 10Hz)
Power Dissipation at T
= 85°C36W
case
8
6
Storage and Junction Temperature –40 to 150
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction-case max. 1.8
2/9
R
th j-case
°
C/W
°
A
A
C
Figure 1: Differential Inputs Test and Application Circuit
1µF
TDA7376B
Figure 2: Single Ended Inputs Test and Application Circuit
1µF
3/9
TDA7376B
Figure 3: Application Board Reference Circuit
1µF
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
f = 1KHz; R
= 4Ω; unless otherwise specified.)
L
= 25°C; VS = 14.4V;
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
d
V
OS
P
O
P
O max
P
O EIAJ
THD Distortion P
C
T
R
IN
G
V
G
∆
E
N
SVR Supply Voltage Rejection f = 100Hz; Vr = 1Vrms;
Supply Voltage 8 18 V
Total Quiescent Drain Current RL =
∞
Output Offset Voltage 120 mV
Output Power THD = 10%
THD = 10%, R
23
2
Ω
L
33
25
37
Max. Output Power (*) VS = 14.4V 36 40 W
EIAJ Output Power (*) VS = 13.7V 32 35 W
= 0.5 to 10W
O
P
= 0.5 to 15W
O
Cross Talk f = 1KHz; Rg = 0
f = 10KHz; Rg = 0
Input Resistance differential input
single ended input
Voltage Gain differential input
single ended input
Channel Gain Balance 1 dB
V
45
40
25
25
Input Noise Voltage Rg = 600Ω; "A Weighted"
Rg = 600Ω; 22Hz to 22KHz
0.03
0.08
80
70
26
26
3
46
45
200 mA
0.3
0.5
27
27
Rg = 0
f = 10KHz; Vr = 1Vrms;
55
Rg = 0
BW Power Bandwidth (–3dB) 75 KHz
CMRR Common Mode Rejection Ratio VCM = 1Vrms input referred 60 dB
A
SB
V
sb IN
V
sb OUT
I
sb
A
M
V
M IN
V
M OUT
I
6
D
DL
D
DOUT
(*) Saturated square wave output
(**) see figure 5 for THD setting.
Stand-by Attenuation VSB = 1.5V; P
= 1W 80 90 dB
Oref
Stand-by in Threshold 1.5 V
Stand-by out Threshold 3.5 V
Stand-by Current Consumption 100
Mute Attenuation VM = 1.5V; P
= 1W 85 dB
Oref
Mute in Threshold 1.5 V
Mute out Threshold 3.5 V
Mute pin Current V6 = 0 to VS, ; V
= 18V 100
S max.
Distortion Detection Level (**) 3.5 %
Distortion Detector Output DC
Current
Output low, sinked current
(V
= 1.5V)
pin10
Output high, leakage current
(V
= VS, @ V
pin10
Smax
= 18V)
1mA
10
W
W
%
%
dB
dB
K
Ω
K
Ω
dB
dB
V
µ
V
µ
dB
dB
A
µ
A
µ
A
µ
The TDA7376B is equipped with a programmable
clipping distortion detector circuitry t hat 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 desired 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
. The actual voltage can be com-
CC
puted by multiplying the fraction corresponding to
the desired THD threshold by the application’s
supply voltage.
5/9
TDA7376B
Figure 5: Clip Detector Threshold vs. THD set.
Voltage.
VS = 14.4V
R
= 4
Ω
L
f = 1KHz
Figure 7: Ouput Power vs. Supply Voltage
Po (W)
45
40
f= 1 KHz
RL= 2
Ω
35
THD= 1 %
30
25
20
Ω
RL= 4
15
10
5
8 9 10 11 12 13 14 15 16 17 18
Vs (V)
Figure 6: Quiescent Current vs. Supply Voltage
RL = 4
Ω
Figure 8: Ouput Power vs. Supply Voltage
Po (W)
55
50
45
40
f= 1 KH z
THD= 10 %
RL= 2
Ω
35
30
25
20
RL= 4
Ω
15
10
5
8 9 10 11 12 13 14 15 16 17 18
Vs (V)
Figure 9: EIAJ Power vs. Supply Voltage
f = 1KHz
V
= 2.5Vrms
i
RL = 3.2
6/9
Ω
RL = 4
Figure 10: THD vs. Frequency
VS = 14.4V
R
= 4
Ω
L
P
= 12W
O
Ω
f (Hz)
TDA7376B
Figure 11: THD vs. Output Power (R
= 4Ω)
L
THD (%)
10
Vs = 14.4 V
Ω
R L = 4
1
f= 1 0 K Hz
0.1
f = 1 KHz
0.01
0.1 1 10
Po (W)
Figure 13: Dissipated Power & Efficiency vs. Out-
put Power
VS = 14.4V
R
= 4
Ω
L
f = 1KHz
Figure 12: THD vs. Output Power (R
THD (%)
10
Vs= 14.4 V
Ω
R L = 2
1
f = 10 K Hz
0.1
f= 1 KHz
0.01
0.1 1 10
Po (W)
Figure 14: SVR vs. Frequency
Ri = 0
= 24Ω)
L
Figure 15: CMRR vs. Frequency
VS = 14.4V
R
= 4
Ω
L
V
= 1Vrms
i
VS = 14.4V
R
= 4
Ω
L
V
= 1Vrms
r
Ri = 600
f (Hz)
Ω
Figure 16: Crosstalk vs. Frequency
VS = 14.4V
R
= 4
Ω
L
P
= 1W
O
R
= 0
L
f (Hz)
f (Hz)
7/9
TDA7376B
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060
G1 17.53 17.78 18.03 0.690 0.700 0.710
H1 19.6 0.772
H2 20.2 0.795
L 21.9 22.2 22.5 0.862 0.874 0.886
L1 21.7 22.1 22.5 0.854 0.870 0.886
L2 17.65 18.1 0.695 0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.63 5.08 5.53 0.182 0.200 0.218
S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102
Dia1 3.65 3.85 0.144 0.152
mm inch
OUTLINE AND
MECHANICAL DATA
Multiwatt15 V
8/9
TDA7376B
Information furnishe d is beli eved to be accu rate and reliable. However, STMicroelec tronics assumes no res ponsibility for the consequences
of use of such i nformation nor for any i nfringement of patents or ot her rights of third par ties which may result from its use. No license i s
granted by impli cation or otherwis e under any patent or patent righ ts of STMicroelect ronics. Specifica tion mentioned in this publication are
subject to change without notic e. This public ation supers edes and replaces all information prev iously supplied. STMic roelec tronic s products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelect roni cs
© 2001 STMicroelectronics – Printed in Italy – All Rights Reserved
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