CS8316 two lithium battery powered mono 25W/single lithium battery 18W constant power output single chip solution

introduction

With the rapid improvement of Bluetooth speaker functions and performance, consumers have higher and higher requirements for thinner products and power. In outdoor application scenarios, single-cell Lithium Battery solutions have become more and more difficult to meet the design needs. For designers, the design of two Lithium Batteries in series is a better choice. Two lithium batteries in series can provide a higher power supply voltage for the speaker system, thereby increasing the output power of the power amplifier. Compared with a single-cell battery boosting to 12V, the requirement for charging current can be reduced, and the battery discharge current is also reduced under the same load, which has a smaller impact on battery life.

In the normal system application of two single-cell batteries, the discharge cut-off voltage is generally not less than 5.6V, and considering the influence of the battery's internal resistance when the current is large, the cut-off voltage is even required to be above 6.4V. For conventional applications with two lithium batteries connected in series, a 4 ohm load can only provide a power output of about 7W (with a distortion of 10%), which is far from meeting the requirements of audio enthusiasts in outdoor applications.

Shenzhen Yongfukang Technology Co., Ltd. is now pushing the audio amplifier-CS8316C, which is specially designed for powering two lithium batteries in series. CS8316C breaks through the limitations of two Lithium battery power supply, and provides terminal products with more extreme power output, making the power output of terminal products comparable to the output power of 12V lead-acid battery-powered audio systems. It comes with class AB/D. Switching perfectly solves FM radio interference.

summary

CS8316C is a fixed 24 times gain, with anti-breaking sound, AB/D switching, power limit, built-in BOOST boost module and boost module with self-adaptive boost function R class mono audio power amplifier. The CS8316C can drive loads as low as 3Ω, and the maximum output is 25W of constant power. The switchable mode design of Class AB and Class D minimizes the interference of the power amplifier in the audio subsystem to FM. The CS8361C is specifically designed for two lithium batteries in series. Case design audio amplifier. CS8316C breaks through the limitations of lithium battery power supply and provides a more extreme power output for terminal products, making the power output of terminal products comparable to the output power of a 12V lead-acid battery-powered audio system. CS8316C's fully differential architecture and extremely high PSRR effectively improve the ability to suppress RF noise. The PWM modulation structure without filter and the built-in BOOST boost module, and the CS8316C adopts the proprietary AERC (Adaptive Edge Rate Control) technology, which greatly reduces the interference of EMI within the full audio bandwidth range, and affects the 60cm audio line It has a margin of more than 20dB under the FCC standard. In addition, the CS8316C has built-in over-current protection, short-circuit protection and over-heat protection, which can effectively protect the chip from damage under abnormal working conditions. CS8316C provides a tiny TSSOP24-PP The package form is for customers to choose, and its rated operating temperature range is -40℃ to 85℃.

description

Built-in BOOST module R type structure, integrated two types of AB and D modes

Output Power

PO at 10% THD+N, VIN = 7.4V

RL = 4 Ω+22uH 21W (D MODE NCN OFF)

PO at 10% THD+N, VIN = 7.4V

RL = 3 Ω+22uH 25W (D MODE NCN OFF)

Excellent "pop-noise" (pop-noise) noise suppression ability

Operating voltage range: 5V to 9V

Adaptive boost function

Built-in 4 anti-breaking sound modes

Built-in POWER-LIMIT (power limit function)

Class-D structure without filtering

Up to 82% efficiency

High power supply rejection ratio (PSRR): 70dB at 217Hz

Start-up time (200ms)

Quiescent current (10mA)

Low shutdown current (50µA)

Overcurrent protection, short circuit protection and overheating protection

Lead-free package that meets Rohs standard

Pin arrangement and definition

CS8316+CS5082 form a complete solution of 5V USB input, dual-cell lithium battery series application, and boost charging to achieve 25W constant power output. The typical schematic diagram is as follows:

Demo board bill of materials

DEMO physical map

In addition, CS8316 also supports 3.7V single-cell lithium battery input, boosted to 12.5V, achieving 18W constant power output. With the CS5256 synchronous DC-DC step-down high-efficiency 2A current charging management complete solution, the typical schematic diagram is as follows: