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TDA7376B
2 x 35W POWER AMPLIFIER FOR CAR RADIO
TDA7376B2 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 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
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
DESCRIPTIONThe 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.
PIN CONNECTION (Continued)
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
BLOCK DIAGRAM
TDA7376B2/9
Figure 1: Differential Inputs Test and Application Circuit
Figure 2: Single Ended Inputs Test and Application Circuit
TDA7376B3/9
Figure 3: Application Board Reference Circuit
Figure 4: P.C. Board and Components Layout of the Circuit of Fig. 3 (1:1 scale)
TDA7376B4/9
ELECTRICAL CHARACTERISTICS (Refer to the test fig. 1 and 2 circuit, Tamb = 25°C; VS = 14.4V; f = 1KHz; RL = 4Ω; unless otherwise specified.)
(*) Saturated square wave output
(**) 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 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 VCC. The actual voltage can be com-
puted by multiplying the fraction corresponding to
the desired THD threshold by the application’s
supply voltage.
TDA7376B5/9
