TDA7296A Datasheet, PDF (5/13 Pages) STMicroelectronics – 70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

TDA7296A
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 SUGGESTED VALUE
PURPOSE
LARGER THAN
SUGGESTED
SMALLER THAN
SUGGESTED
R1 (*)
22k
INPUT RESISTANCE INCREASE INPUT DECREASE INPUT
IMPRDANCE
IMPEDANCE
R2
R3 (*)
680Ω
22k
CLOSED LOOP GAIN DECREASE OF GAIN INCREASE OF GAIN
SET TO 30dB (**)
INCREASE OF GAIN DECREASE OF GAIN
R4
22k
ST-BY TIME
LARGER ST-BY
SMALLER ST-BY
CONSTANT
ON/OFF TIME
ON/OFF TIME;
POP NOISE
R5
10k
MUTE TIME
LARGER MUTE
SMALLER MUTE
CONSTANT
ON/OFF TIME
ON/OFF TIME
C1
0.47µF
INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C2
22µF
FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C3
10µF
MUTE TIME
LARGER MUTE
SMALLER MUTE
CONSTANT
ON/OFF TIME
ON/OFF TIME
C4
10µF
ST-BY TIME
LARGER ST-BY
SMALLER ST-BY
CONSTANT
ON/OFF TIME
ON/OFF TIME;
POP NOISE
C5
22µF
BOOTSTRAPPING
SIGNAL
DEGRADATION AT
LOW FREQUENCY
C6, C8
1000µF
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
C7, C9
0.1µF
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAIN HAS TO BE ≥ 24dB
5/13