Ht81293 built in adaptive dynamic boost 20W mono class D power amplifier IC solution

2017 Since then , Outdoor Bluetooth speaker （ Include 2 " /4 Inch speaker, portable Bluetooth speaker and 6 " /8 Inch outdoor pull rod speaker and other product types ） Become the fastest growing speaker category . This kind of speaker is mainly powered by a single lithium battery , Generally, the built-in boost audio power amplifier chip is selected , Power amplifier chips without inductor boost of charge pump are most commonly boosted to 6.3V Up and down power output 3～5W/4 o , inductance Boost Boost the power amplifier chip to 7V Left and right power output 6～8W/3 o , Its performance basically meets the indoor requirements , Application of outdoor scenes . But higher power and better sound quality have always been the eternal pursuit of the speaker market . Shenzhen yongfukang Technology Co., Ltd. complies with the demand for sound quality and power upgrading in the pull rod speaker and Bluetooth small speaker market , Promote a single and double lithium battery power supply with built-in adaptive dynamic boost 20W Mono D Class amplifier IC-HT81293. Adopt the latest BCD process , Inside Boost The module is boosted to 12V, Already with lead-acid batteries / The voltage of three lithium batteries in series is equal , It realizes the extreme power output of single lithium battery power supply . HT81293 Unique adaptive dynamic boost , The output voltage of the power module can be adjusted according to the required output power of the chip , Greatly improve the battery life of lithium batteries ; The input current limit function can set the maximum input current , In order to avoid the main control restart due to the low instantaneous voltage drop of the lithium battery （ Considering the power requirements , It is generally recommended that the maximum input current be set to 8A about ）; It can be controlled by a master IO The port is turned off 、 Turn on 、 Anti breaking sound on / Switch off and other modes , Save the resources of Bluetooth master ;2 Gear anti breaking mode ,ACF1 Wide dynamic volume shock mode is suitable for outdoor pull rod speakers ,ACF2 High fidelity and low distortion mode is suitable for portable Bluetooth speakers , The two modes only need to change the peripheral resistance , You can present different styles of sound quality . HT81293 summary HT81293 It is a mono with built-in boost D Class a audio power amplifier , When powered by lithium battery , THD+N=10%, Capable of continuous output 18W power （4Ω load ）. HT81293A Built in dynamically adjustable boost , It can provide a voltage suitable for different output power to D Class amplifier , It can greatly improve the system efficiency , Extend battery life .HT81293F Built in fixed boost , Provide a fixed 9V or 12V Boost to D Class amplifier .HT81293 Configurable boost current limit , To prevent excessive current spikes . HT81293 The biggest feature of the is to prevent the distortion of the top cutting （ACF） Output control function , It can detect and suppress the input music 、 Peak clipping distortion of output signal caused by excessive amplitude of speech signal （ alternative pronunciations ）, It can also adaptively prevent BOOST The output is peaked due to the drop of boost voltage , Significantly improve sound quality , Create a very comfortable listening experience , And protect the loudspeaker from overload damage .HT81293 Offering two different musical experiences ACF Pattern , as well as ACF-Off Pattern . HT81293 It has advanced spread spectrum function to suppress EMI. HT81293 The gain is 32dB. Besides ,HT81293 Integrated output overcurrent protection 、 On chip over temperature protection 、 Boost overvoltage protection and other functions . HT81293 characteristic ・ Anti - distortion function ( Anti breaking sound , Anti-Clipping Function, ACF) ・ Spread spectrum technology ・ Output power ： 18W (VBAT=3.7V, RL=4Ω, THD+N=10%, fIN = 1kHz) 16W (VBAT=3.7V, RL=4Ω, THD+N=1%, fIN = 1kHz) ・VBAT Power supply range ：3.0V to 12V, Give consideration to the application of single and double lithium batteries ・ Efficient H Class boost function - Boost rail for adaptive power amplifier , Extend battery playback time (HT81293A) - Adjustable maximum current limit , Effectively prevent the battery from pulling ・ Protection function : Over current / Overheated / Overvoltage protection function ・ Lead free packaging ,ESOP16 HT81293 application ・ bluetooth / Wi-Fi Loudspeaker box   ・ Portable speakers   ・ Intelligent speakers    ・ Smart home HT81293 Dynamic boost waveform ：   HT81293 Application information 1. HT81293 Foot bitmap   2.HT81293 Pin instructions 3.HT81293DEMO Primitively   4.HT81293DEMO plate PCB Top level design drawing 5. HT81293DEMO plate PCB Ground floor design drawing 6.HT81293DEMO Plate patch diagram     7.HT81293DEMO Board bill of materials 8.HT81293DEMO plate 3D Front of layout 9.HT81293DEMO plate 3D On the reverse side of the layout 10.HT81293 DEMO Physical drawing of the board