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Std edition tda7293-parallel-modular

Profile:TDA7293 in parallel power audio amplifier modular application

License: CC-BY-NC-SA 3.0

Published Time: 2022-01-10 09:01:15
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Description

TDA7293 in parallel power audio amplifier

 

  • The modular application is where several devices operate in parallel.
  • The modular application allows very high power to be delivered to very low-impedance loads.
  • In this type of application, one device acts as a master and the others as slaves.
  • The slave power stages are driven by the master device and work in parallel together while

class AB amplifier in Hi-Fi field applications, such as home stereo, self powered loudspeakers and Topclass TV. Thanks to the wide voltage range and to the high output current capability it is able to supply the highest power into both 4-Ω and 8-Ωloads.The built-in muting function with turn-on delay simplifies the remote operation avoiding on-off switching noises.Parallel mode is possible by connecting several devices and using pin11. High output power can be delivered to very low impedance loads, so optimizing the thermal dissipation of the system.

 

The modular application is where several devices operate in parallel.

The modular application allows very high power be delivered to very low-impedance loads. In this type of application one device acts as a master and the others as slaves.

The slave power stages are driven by the master device and work in parallel together while the input and the gain stages of the slave devices are disabled. The figure below shows the connections required to configure two devices to work together.

The master chip connections are the same as the normal single ones.

The outputs can be connected together without the need of any ballast resistor.

The slave SGND pin must be tied to the negative supply. The slave STANDBY and MUTE pins must be connected to the master STANDBY and MUTE pins.

The bootstrap lines must be connected together and the bootstrap capacitor must be increased: for N devices the bootstrap capacitor must be 22 μF times N.

The slave IN pin must be connected to the negative supply.

 

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design drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 TDA7293 IC1,IC2 MULTIWATT15V 2
2 20K R2 0207/10 1
3 680 R3 0207/10 1
4 22K R4,R5 0207/10 2
5 8.2 R6 0309/10 1
6 30K R7 0207/10 1
7 10K R8 0207/10 1
8 100n C1,C2,C12,C13 C050-024X044 4
9 100µF C3,C4 E3,5-8 2
10 47µF C5,C11 E2,5-7 2
11 220pF C6 C050-024X044 1
12 100n C7 C050-025X075 1
13 1µF C8 C5B5.5 1
14 1N4148 D1 DO35-10 1
15 10µF C9,C10 E2-5 2
16 IN CN3 JST-XH-02-PACKAGE-LONG-PAD 1
17 POWER CN1 TERMINAL-BLOCK-3-PIN-3.5MM-LONG-PAD 1
18 OUT CN2 TERMINAL-BLOCK-2-PIN-3.5MM-LONG-PAD 1

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