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TDA7294S Datasheet, PDF (5/13 Pages) STMicroelectronics – 100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY | |||
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TDA7294S
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
680â¦
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)
-VS +3V
-VS +1V
-VS
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 3.9â¦/2W
and the capacitor is 1µF.
5/13
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