CS8685 Dual Channel 2x80W High Power Class D Audio Amplifier IC Solution

introduction

Class D audio power amplifier IC has the advantages of small size, low heat generation, high integration and high-definition sound quality. It can provide higher output power than traditional Class AB audio amplifiers at the same voltage and occupies less board area. It is an ideal choice for audio system consumer electronics products such as home theater systems, soundbars, subwoofers, etc. In recent years, Class D audio power amplifier IC has been increasingly widely used due to its high efficiency and in line with the development trend of modern society.

Recently, Shenzhen Yongfukang Technology Co., Ltd. vigorously promoted a 2x80W dual-channel high-power Class D audio amplifier IC-CS8685H, which uses a unique EQB-32 (top heat dissipation pad external heat sink) package. The strong driving ability can ensure high-power output, drive two 4-ohm speakers at a 26V power supply voltage, without any power or current limitation, and achieve high-power and high-efficiency audio output. It fully meets the needs of sound bars, aftermarket car audio solutions, and high-power Bluetooth speakers.

Key Features and Benefits 

- 5.0V to 35V wide power supply voltage adapts to a variety of power applications: supports 3 or 4 lithium batteries, lead acid, etc. to boost to 26V; 18-30V adapter power supply and other applications;

- Master-slave mode programmable control can achieve unlimited cascade power output to meet 2.1, 4.0, 5.1 and other multi-channel applications;

- Multiple switching frequencies are optional, and AM suppression function can avoid radio interference;

- Low RDS(on), 20% lower than leading competitive products, which can improve low-frequency diving;

Measured output power index

summary 

CS8685H is a 2x80W stereo Class D audio power amplifier. This device has a heat sink designed on the top layer. After the heat sink is connected to the pad, it can output a maximum of 2x75W of continuous power at a power supply voltage of 24V. The master-slave mode setting allows the CS8685H to be infinitely cascaded, thereby achieving multi-channel output of the system. CS8685H has advanced EMI suppression technology. It uses surface mount technology and only requires a small number of peripheral devices to enable the system to have high-quality audio output power. CS8685H has built-in over-current protection, short-circuit protection and over-heat protection, which effectively protects the chip from being damaged under abnormal working conditions. CS8685H can reach an efficiency of more than 93%, and the microchip with a voltage resistance design of more than 40V provides ultra-high reliability, which can reduce the defective ratio in the production process to a limited extent.

CS8685H provides a special EQB32 package for customers to choose. The appropriate package size provides the greatest convenience for customers to install heat dissipation devices. Its rated operating temperature range is -40℃ to 85℃.

describe 

• Output power (THD+N=10%)

  VDD = 24V@RL = 4Ω 2x75W

  VDD = 28V@RL = 4 Ω 2x100W(peak)

  
  

• Output power (THD+N=1%)

        VDD = 22V@RL = 4Ω 2x50W

        VDD = 24V@RL = 4Ω 2x62W

        VDD = 26V@RL = 4Ω 2x70W

        VDD = 28V@RL = 6Ω 2x60W

        VDD = 30V@RL = 6Ω 2x68W

• Single power supply, wide power supply voltage range: 5V-30V

• High reliability design: 40V withstand voltage design
  

• Efficiency up to 93% 

• Three gain levels available

• Mute function control

• Master-slave mode programmable control, can achieve unlimited cascade power output

• Audio system with filter network, quiescent current less than 15mA@24V

• Multiple switching frequencies available, AM suppression function

• Programmable power limit

• Good short circuit protection and temperature protection with automatic recovery function

• Good distortion and anti-pop performance

• Enhanced package design: special design of top heat sink pad

• Differential input

• Meets automotive application requirements

Application Information

1. CS8685H pinout

2. CS8685H pin description

3. CS8685H DEMO board schematic diagram

4. CS8685H DEMO board PCB top design diagram

5. CS8685H DEMO board PCB bottom design diagram

6. CS8685H DEMO board patch diagram

7. CS8685H DEMO board bill of materials

8. CS8685H DEMO board physical picture