Datasheet TDA7294 (STMicroelectronics) - 9

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TDA7294 Application suggestion 7 Application suggestion
The recommended values of the external components are those shown on the application circuit of Figure 1. Different values can be used; the following table can help the designer.
SUGGESTED LARGER THAN SMALLER THAN COMPONENTS PURPOSE VALUE SUGGESTED SUGGESTED
INCREASE INPUT DECREASE INPUT R1 (1) 22 kΩ INPUT RESISTANCE IMPEDANCE IMPEDANCE R2 680 Ω CLOSED LOOP GAIN SET DECREASE OF GAIN INCREASE OF GAIN TO 30 dB (2) R3 (1) 22 kΩ INCREASE OF GAIN DECREASE OF GAIN LARGERST-BY ON/OFF SMALLER ST-BY ON/OFF R4 22 kΩ ST-BYTIME CONSTANT TIME TIME; POP NOISE LARGER MUTE ON/OFF SMALLER MUTE ON/OFF R5 10 kΩ MUTE TIME CONSTANT TIME TIME HIGHER LOW C1 0.47 μF INPUT DC DECOUPLING FREQUENCY CUTOFF FEEDBACK DC HIGHER LOW C2 22 μF DECOUPLING FREQUENCY CUTOFF LARGER MUTE ON/OFF SMALLER MUTE ON/OFF C3 10 μF MUTETIME CONSTANT TIME TIME LARGERST-BY ON/OFF SMALLERST-BY ON/OFF C4 10 μF ST-BYTIME CONSTANT TIME TIME; POP NOISE SIGNAL DEGRADATION AT C5 22 μF BOOT STRAPPING LOW FREQUENCY SUPPLY VOLTAGE DANGER OF C6, C8 1000 μF BYPASS OSCILLATION SUPPLY VOLTAGE DANGER OF C7, C9 0.1 μF BYPASS OSCILLATION 1. R1= R3 for pop optimization. 2. Closed loop gain has to be 24 dB.
DS0013
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Rev 8 page 9/31
Document Outline Features Description 1 Typical application 2 Pin connection 3 Block diagram 4 Maximum ratings 5 Electrical characteristics 6 PCB and components 7 Application suggestion 8 Typical characteristics 9 Introduction 9.1 Output stage 9.2 Protections 9.3 Other features 10 Application information 11 Bridge application 12 Package information 12.1 Multiwatt15 V package information 12.2 Multiwatt15 H package information Revision history