4-channel linear audio amp slashes power consumption by 90%

December 07, 2017 // By Julien Happich
Offering efficiency comparable to class-D digital amplifiers, Toshiba Electronics' TCB701FNG 4-channel audio amplifier IC uses patented technology to operate at just 10% of the power of conventional class-AB amplifiers (under normal operating conditions: 0.5W to 4W). BoM cost is around half that of more expensive Class-D alternatives as no EMI or low-pass filtering is required.

The TCB701FNG incorporates an extended set of self-diagnosis capabilities that can monitor and report various error states via the I 2C bus. These capabilities include full-time fault detection of output DC offset. This prevents speaker burnout and improves overall reliability. Additional functionality includes anti high-frequency noise, protection against output cross connection and over- and under-voltage, three levels of over-temperature detection, standby/mute control and GSM noise suppression.

The new chip is supplied in a 36-pin HSSOP package and can be used in both power amplifier and line drive mode. The device can operate with a supply voltage of 6V to 18V, supports 49W x4 channels, and is compatible with speakers rated to 2Ω. Output noise voltage is just 60µVrms.

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