Automotive Class-H audio and tracking power supply reference design


Design files


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
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Important note

Test data for this reference design is available by request. Request now

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUA71.PDF (867 K)

Reference design overview and verified performance test data


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM5123-Q12.2MHz wide VIN low IQ synchronous boost controller

Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)

LM51231-Q12.2-MHz wide-VIN, synchronous boost controller with output voltage tracking

Data sheet: PDF | HTML
Analog current-sense amplifiers

INA302-Q1AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM7481-Q1Automotive ideal diode controller with active rectification driving B2B NFETs

Data sheet: PDF | HTML
Speaker amps

TAS6584-Q1Automotive 45-V, 10-A digital input, four-channel Class-D audio amplifier with current sense

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Design guide Automotive Class-H Audio and Tracking Power Supply Reference Design PDF | HTML Jan. 10, 2022

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