PMP9491

Audio Boom Box/Portable Speaker Reference Design with Efficient Boost Converter.

PMP9491

Design files

Overview

PMP9491 is a 30W highly efficient and compact Portable Speaker/Audio Boom Box reference Design which can be used in 15W +15W Stereo or 30W Woofer Applications. The Power Source for the Design is 1 or 2 Li ion in Series . The design is broadly divided into three main stages:

  1. Highly efficient Single-Phase Non Synchronous Boost Converter using the LM3481 controller IC.  The design accepts an input voltage of 3.3Vin to 9Vin and provides an output of 12 V capable of supplying 2.5A of continuous current to the load.  The peak efficency acheived is 95 percent .
  2. 15W+15W Stereo Audio Amplifier with TPA3118D2 Class D device.
  3. Very Low Cost Stereo Inputs to Woofer Bass Input Conversion.
  4. Battery Charger bq24133 , 2.5A Synchronous Switch-Mode Li-Ion/Li-Polymer Stand-Alone Battery Charger with Integrated MOSFETs and Power Path Selector.

Features
  • Low Cost Non Synchronous Boost for Audio Boom Box application.
  • Ultra Low Footprint Area for LM3481 Actual Power Stage
  • Single Speaker (Woofer), Dual Speaker(Stereo) Support in the design
  • Low Vin Support for Single as well as Dual Li ion Battery support
  • 100-kHz to 1-MHz Adjustable / Synchronizable Clock Frequency and limits the inrush current at start-up.
  • Battery Charger with Dynamic Power Path management


 

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.

TIDU805.PDF (4766 K)

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

TIDRD32.PDF (148 K)

Detailed schematic diagram for design layout and components

TIDRD33.PDF (24 K)

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

TIDC928.ZIP (322 K)

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

Products

Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24133Standalone 1-3 cell 2.5A synchronous Buck battery charger with external Power Path

Data sheet document-pdfAcrobat PDF
Boost controllers (external switch)

LM34812.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD16321Q525-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.6 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD17313Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 32 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML
P-channel MOSFETs

CSD25310Q2-20-V, P channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 23.9 mOhm

Data sheet document-pdfAcrobat PDF open-in-new 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 document-pdfAcrobat PDF open-in-new HTML
Speaker amps

TPA3118D230-W stereo, 60-W mono, 4.5- to 26-V supply, analog input Class-D audio amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Speaker amps

TPA3130D215-W stereo, 30-W mono, 4.5- to 26-V supply, analog input Class-D audio amplifier w/ filter free

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
Technical article Portable speaker power: Making the bass possible May 12, 2015
Test report PMP9491 Test Results Feb. 26, 2015

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