Stereo Class D amplifier

11 November 2009 Analogue, Mixed Signal, LSI

STMicroelectronics has developed a new 50 W + 50 W stereo Class D amplifier IC that achieves high efficiency and requires few external components. Joining ST’s family of analog-input Class D ICs, the TDA7492 expands the family at the high end. The family now includes 3 W-, 5 W-, 10 W-, 20 W-, 25 W, and 50 W-per-channel variants in pin-compatible packages that enable convenient scaling of designs to address multiple markets.

The TDA7492 uses ST’s advanced sixth-generation BCD6S (bipolar/CMOS/DMOS) process, which allows analog, logic and high-voltage functions on a single chip. This process achieves high operating efficiency per chip size, while simultaneously reducing crosstalk, leading to improved audio quality. In addition, BCD6S enables complementary NMOS and PMOS transistors in the high-power output circuitry, saving the external bootstrap capacitor and diode normally required by other processes.

The device achieves low distortion (THD+N) of below 0,01% to deliver a high-quality listening experience. Built-in output filtering minimises the external audio-filter requirement, and standby and mute functions are also integrated. The IC is optimised for low EMI emissions, which further simplifies the design of Class D amplifiers delivering smaller size and greater audio power than conventional class-A/B circuits.

Other features include external synchronisation, which allows high-performance, multichannel Class D amplifiers combining several individual ICs. The thermally enhanced Power SSO-36 package has an exposed upper heat slug allowing convenient attachment of a simple heatsink.

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