TDA7296S Datasheet, PDF (5/11 Pages) STMicroelectronics – 60V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

TDA7296S
APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1)
The recommended values of the external components are those shown on the application circuit of Fig-
ure 1. Different values can be used; the following table can help the designer.
COMPONENTS
R1 (*)
R2
R3 (*)
R4
R5
C1
C2
C3
C4
C5
C6, C8
C7, C9
SUGGESTED VALUE
PURPOSE
LARGER THAN
SUGGESTED
SMALLER THAN
SUGGESTED
22k
INPUT RESISTANCE INCREASE INPUT DECREASE INPUT
IMPEDANCE
IMPEDANCE
680Ω
22k
CLOSED LOOP GAIN DECREASE OF GAIN INCREASE OF GAIN
SET TO 30dB (**)
INCREASE OF GAIN DECREASE OF GAIN
22k
ST-BY TIME
LARGER ST-BY
SMALLER ST-BY
CONSTANT
ON/OFF TIME
ON/OFF TIME;
POP NOISE
10k
MUTE TIME
LARGER MUTE
SMALLER MUTE
CONSTANT
ON/OFF TIME
ON/OFF TIME
0.47µF
INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
22µF
FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
10µF
MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
10µF
ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
22µFXN (***)
BOOTSTR APPING
SIGNAL
DEGRADATION AT
LOW FREQUENCY
1000µF
SUPPLY VOLTAGE
BYPASS
0.1µF
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 for pop optimization
(**) Closed Loop Gain has to be ≥ 26dB
(***) Multiply this value for the number of modular part connected
Slave function: pin 4 (Ref to pin 8 -VS)
-V_S +3V
-V_S +1V
-V_S
MASTER
UNDEFINED
SLAVE
D98AU821
Note:
If in the application, the speakers are connected
via long wires, it is a good rule to add between
the output and GND, a Boucherot Cell, in order to
avoid dangerous spurious oscillations when the
speakers terminal are shorted.
The suggested Boucherot Resistor is 3.9Ω/2W
and the capacitor is 1µF.
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