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E-TDA7385 데이터 시트보기 (PDF) - STMicroelectronics

E-TDA7385 4 x 42 W quad bridge car radio amplifier ST-Microelectronics
STMicroelectronics ST-Microelectronics
E-TDA7385 Datasheet PDF : 17 Pages
First Prev 11 12 13 14 15 16 17
Application hints
Application hints
Referred to the circuit of Figure 3.
Biasing and SVR
As shown by Figure 14, all the TDA7385’s main sections, such as Inputs, Outputs AND AC-
GND (pin 16) are internally biased at half supply voltage level (Vs/2), which is derived from
the Supply Voltage Rejection (SVR) block. In this way no current flows through the internal
feedback network. The AC-GND is common to all the 4 amplifiers and represents the
connection point of all the inverting inputs.
Both individual inputs and AC-GND are connected to Vs/2 (SVR) by means of 100 k
To ensure proper operation and high supply voltage rejection, it is of fundamental
importance to provide a good impedance matching between Inputs and AC-GROUND
terminations. This implies that C1, C2, C3, C4, C5 capacitors have to carry the same
nominal value and their tolerance should never exceed ± 10 %.
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients. To conveniently serve both needs, its minimum recommended value
is 10µF.
Figure 14. Input/output biasing
+7 362
Input stage
The TDA7385’s inputs are ground-compatible and can stand very high input signals
(± 8 Vpk) without any performances degradation.
If the standard value for the input capacitors (0.1 µF) is adopted, the low frequency cut-off
will amount to 16 Hz.
Doc ID 8160 Rev 6
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