ST TDA7376B User Manual

®
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.
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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
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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)
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TDA7376B
ELECTRICAL CHARACTERISTICS (Refer to the test fig. 1 and 2 circuit, T
f = 1KHz; R
= 4; 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
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
K
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.
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TDA7376B
Figure 5: Clip Detector Threshold vs. THD set.
Voltage.
VS = 14.4V R
= 4
L
f = 1KHz
Figure 7: Ouput Power vs. Supply Voltage
Po (W)
45 40
f= 1 KHz
RL= 2
35
THD= 1 %
30 25 20
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
Figure 8: Ouput Power vs. Supply Voltage
Po (W)
55 50 45 40
f= 1 KH z THD= 10 %
RL= 2
35 30 25 20
RL= 4
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
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RL = 4
Figure 10: THD vs. Frequency
VS = 14.4V R
= 4
L
P
= 12W
O
f (Hz)
TDA7376B
Figure 11: THD vs. Output Power (R
= 4)
L
THD (%)
10
Vs = 14.4 V
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
L
f = 1KHz
Figure 12: THD vs. Output Power (R
THD (%)
10
Vs= 14.4 V
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
= 24)
L
Figure 15: CMRR vs. Frequency
VS = 14.4V R
= 4
L
V
= 1Vrms
i
VS = 14.4V R
= 4
L
V
= 1Vrms
r
Ri = 600
f (Hz)
Figure 16: Crosstalk vs. Frequency
VS = 14.4V R
= 4
L
P
= 1W
O
R
= 0
L
f (Hz)
f (Hz)
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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
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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.
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