Profile：TDA7293 in parallel power audio amplifier modular application
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TDA7293 in parallel power audio amplifier
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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