Dual-cell 3.7v 18650 battery pack supply realizes 2X20W audio boost charging combination solution

　　Portable Bluetooth speakers can be said to be the most widely used and popular audio products at present. Especially with the rise of smartphones and smart homes, their growth is rapid. It is easy to connect and can be seamlessly connected with mobile phones and other music devices; it has a certain degree of portability, some can be carried with you, and some can be placed in the car, bedroom, living room, or even outdoors or in squares, and are widely used.

　　Initially, the common solution for portable Bluetooth speakers was to be driven by only one lithium battery. The cost was not high and the battery lasted for a long time, so it was widely accepted by consumers. The representative audio power amplifier of this solution is the HT6873, which is directly driven by a lithium battery, ensuring the industry's largest power and sufficient sound quality. As a result, portable wireless speakers began to gain popularity among consumers.

　　But over time, people began to be dissatisfied with the limited power. Portable Bluetooth speakers are beginning to work towards greater power, fuller sound quality, and richer bass in pursuit of a broader market. During this period, people had plans to use a lithium battery with an external boost chip to power an audio amplifier, or a lithium battery to power an audio amplifier with a built-in boost. There were also plans to directly use two lithium batteries in series to power the audio amplifier. Audio amplifier solution. These solutions have improved the system power to varying degrees and have better performance in sound quality.

　　However, with the popularity of portable Bluetooth speakers, all parties are flocking to the market. Competition has become increasingly fierce, cost requirements have become higher, performance has become more extreme, and demand for product differentiation has further increased. In addition, in recent years, smart speakers brought by Amazon Echo have The craze has also driven portable Bluetooth speakers, and some portable wireless speakers have begun to develop in the direction of speech recognition, which has further improved low power consumption, vocal performance, and sound quality performance.

　　Therefore, the dual-cell lithium battery audio boost overall solution launched by Shenzhen Yongfukang Technology Co., Ltd. caters to this trend and can be used as a unique portable Bluetooth audio reference design:

　　(1) On the one hand, its solution integrates the HT7178 boost chip. The 7.4V voltage is boosted to 15V (the boost value can be adjusted as needed) and provided to the audio power amplifier chip HT317. The system power is increased to 2×18W@4ohm. , 1%, greatly improving the sound quality, and the rich bass is easier to achieve. It can be said to be the ultimate performance of portable audio, and these chips have good price advantages on the premise of good sound quality and greater power.

　　*HT7178: 20V, 2A fully integrated synchronous boost converter

　　The device has a switching current capability of 12A and can provide an output voltage of up to 20V. It integrates a 11mΩ power switch tube and a 13mΩ synchronous rectifier tube, saving PCB area and peripheral costs, and has the highest cost performance among similar products.

　　*HT317: 75WpBTL, 30WBTL, Class D audio power amplifier

　　The device has simplified peripherals (TSSOp28), can provide 2×30W power under the conditions of 24V, 8ohm, THD+N=1%, and has AGC, over-temperature limiting and various protection functions, because of its obvious cost performance With its advantages and good sound quality performance, it is a powerful successor to the star product TpA3116/8.

　　(2) In addition, the solution integrates charging management.

　　Dual-cell lithium battery series solutions generally require a 9V or 12V adapter and a specialized charging management chip to coordinate dual-cell charging. This solution adds a lot of cost, and it also brings unnecessary inconvenience to end consumers because it requires a special charging cable.

　　The CS5080 charging management IC used in this solution can support 5V USB input to charge two lithium batteries. Its unique boost charging management IC system can use mobile phone chargers to charge dual-cell lithium batteries in series, allowing terminal audio equipment to eliminate the need for special charging adapters, further reducing the overall cost of audio terminal products and shrinking the outer packaging of audio terminal products. size.

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