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This reference design demonstrates a Class-H audio and tracking power supply audio subsystem. The TAS6584-Q1 audio amplifier tracks the envelope of the digital audio input and adjusts the LM5123-Q1 boost output voltage to meet the power efficiency requirements without the need for an external microcontroller. This reference designs leads to improved efficiency, thermal performance, and a smaller total footprint. In addition, this reference design allows for a Class-H implementation to be plug-and-play with minimal software changes to the rest of the automotive audio architecture.
- Self-contained Class-H control allows for simplified implementation in external amplifier applications and minimizes the need for additional digital power controller or software
- Includes an input protection circuit to protect against external transients, reverse battery conditions, and system overcurrent events
- This reference design uses TAS6584-Q1, which is the first 45-V automotive Class-D audio amplifier with integrated current sense and integrated Class-H control in the industry. This design delivers maximum output power and high fidelity audio
- The design also contains LM5123-Q1, which is a 2.2-MHz wide-VIN low-IQ synchronous boost controller with a TRACK pin for simplified tracking power-supply design
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
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LM51231-Q1 — 2.2-MHz wide-VIN, synchronous boost controller with output voltage trackingData sheet: PDF | HTML
TAS6584-Q1 — Automotive 45-V, 10-A digital input, four-channel Class-D audio amplifier with current senseData sheet: PDF | HTML
|Design guide||Automotive Class-H Audio and Tracking Power Supply Reference Design||PDF | HTML||Jan. 10, 2022|
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