Highly Efficient and Compact 100-W Automotive Amplifier Reference Design with Boost Converter


Design files


PMP9484 is a 100W highly efficient and compact automotive amplifier reference design which can be used in 50W +50W stereo or 100W woofer applications.  The design is broadly divided into three main stages:
1.) Highly efficient single-phase synchronous boost converter using the LM5122 controller IC.  The design accepts an input voltage of 7.5Vin to 20Vin (12Vin nominal) and provides an output of 24V capable of supplying 5A of continuous current to the load.  The peak efficiency acheived is 98 percent.
2.) 50W+ 50W stereo audio amplifier with TPA3116D2 Class D device
3.) Very low cost stereo input to woofer bass input conversion

  • Synchronous rectification in boost for very high efficiency
  • Ultra-low footprint area for LM5122
  • Actual power stage combo with highly efficient class D amplifier
  • Single speaker (woofer), dual speaker (stereo) support in the design
  • Low Vin support for automotive application
Output voltage options PMP9484.1
Vin (Min) (V) 6.5
Vin (Max) (V) 20
Vout (Nom) (V) 24
Iout (Max) (A) 5
Output Power (W) 120
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

TIDU563.PDF (3864 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC652.ZIP (375 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

LM51223-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

Data sheet: PDF | HTML
General-purpose op amps

LM324AQuad, 30-V, 1.2-MHz, 3-mV offset voltage operational amplifier

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18501Q5A40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 3.2 mOhm

Data sheet: PDF | HTML
Speaker amps

TAS5404-Q1Automotive, 26-W, 4-ch, 6- to 18-V analog SE input Class-D audio amplifier w/ I2C diag & load dump

Data sheet: PDF | HTML
Speaker amps

TPA3116D250-W stereo, 100-W mono, 4.5- to 26-V supply, analog input Class-D audio amplifier w/ SpeakerGuard™

Data sheet: PDF | HTML
Speaker amps

TPA3116D2-Q1Automotive, 50-W, 2-ch, 4.5- to 26-V supply analog input Class-D audio amplifier

Data sheet: PDF | HTML
Speaker amps

TPA3118D2-Q1Automotive, 30-W, 2-ch, 4.5- to 26-V supply analog input Class-D audio amplifier

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP9484 Test Results Sep. 29, 2014

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