350W audio dedicated power circuit

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Photocoupler

The following circuit diagram shows a 350W audio power supply circuit designed using the L6569 chip from STMicroelectronics. This chip is a highly efficient and versatile solution for creating audio power supplies. The L6569 is a self-oscillating driver IC that employs a bipolar CMOS-DMOS (BCD) manufacturing process and includes an internal bootstrap configuration. Unlike older models like the IR2155 or IR2151, this IC eliminates the need for an external fast recovery bootstrap diode, simplifying the design process and reducing component count. Additionally, it features a dead time control circuit in both the high-drive (HO) and low-drive (LO) circuits, ensuring a precise time interval of 1.2 microseconds between the square-wave pulses at pins 7 and 5. This feature prevents the simultaneous conduction of complementary output devices, which could lead to shoot-through current issues.

For example, its 200W electronic transformer circuit is particularly well-suited for use as an audio power supply. Below is a detailed diagram showcasing this setup (Figure 1-1). Furthermore, here is a compilation of some notable foreign audio ICs that might be of interest to engineers working on similar projects:

As technology continues to evolve, these types of power supply designs remain crucial for delivering stable and efficient power to audio equipment. The L6569 offers a modern approach to traditional power supply challenges, making it a popular choice among designers seeking reliability and performance in their audio applications. Whether you're building a home theater system or a professional audio rig, understanding the intricacies of power supply circuits is essential for achieving optimal sound quality.