Audio Boom Box/Portable Speaker Reference Design with Efficient Boost Converter.
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: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 .15W+15W Stereo Audio Amplifier with TPA3118D2 Class D device. Very Low Cost Stereo Inputs to Woofer Bass Input Conversion.Battery Charger bq24133 : 2.5A Synchronous Switch-Mode Li-Ion/Li-Polymer Stand-Alone Battery Charger with Integrated MOSFETs and Power Path Selector.
Low Cost Non Synchronous Boost for Audio Boom Box application.Ultra Low Footprint Area for LM3481 Actual Power StageSingle Speaker (Woofer): Dual Speaker(Stereo) Support in the design Low Vin Support for Single as well as Dual Li ion Battery support100-kHz to 1-MHz Adjustable / Synchronizable Clock Frequency and limits the inrush current at start-up. Battery Charger with Dynamic Power Path management