The efficiency of digital amplifiers is much higher than other amplifiers, with a comprehensive utilization efficiency of over 80%. The power amplifier generates less heat, operates at lower temperatures, and has significantly improved lifespan and reliability compared to other power amplifiers. The digital amplifier adopts a high power density design, which has many advantages such as small size, light weight, energy saving, and power saving. At the same time, digital amplifiers are also amplifiers with low distortion, low noise, and stronger anti-interference capabilities, widely used in various fields such as car audio, conference systems, stage audio, home theaters, etc.
The main function of inductance in digital power amplifier circuits is to form a low-pass filter with capacitors, suppress high-frequency ripple, and filter out clutter signals. Therefore, in order to meet the requirements of high efficiency, low temperature rise, high fidelity, high reliability, and small size of class D power amplifiers, the selection of filter inductors has become particularly crucial.
1. Inductor Design for Digital Power Amplifier
Small size: Due to the high power density design of digital amplifiers, their inductors must have a compact design structure to achieve small volume and meet high-density installation requirements.
Low loss: Choose a low loss magnetic core material design that is suitable for high-frequency and wide temperature environments, reducing the heat generation of digital power amplifier equipment, minimizing losses, and improving output efficiency.
High saturation: Excellent DC bias capability can effectively suppress transient current peaks, achieve low distortion, and ensure high-quality audio output.
Anti interference performance: High power density design inevitably leads to high-density placement of components, enhanced PCB wiring, and electromagnetic interference between components. Therefore, digital amplifier inductors also need to have excellent anti electromagnetic interference capabilities.
High reliability: Digital amplifiers are usually used in outdoor or automotive fields, so inductive products must also be able to adapt to high temperature, high mechanical vibration and other application environments, and be able to operate stably and reliably in complex environments.
2. CODACA Digital Amplifier Inductor Solution
As a professional inductance enterprise with 24 years of experience in developing power inductors, CODACA has developed multiple series of digital amplifier specific inductors, such as CSD, CPD, CPE, CSAD, etc. The products have the characteristics of low loss, high efficiency, high current, wide frequency and wide temperature, and have been widely used in the design of various D-class high-power amplifier solutions such as car audio, home theater, and high-end home audio.
Figure.1 Application diagram of digital amplifier inductor
2.1 High current digital power amplifier inductor CSD series
CODACA's high current digital amplifier inductor CSD series uses low loss magnetic core materials and oxygen free copper wire materials to achieve low distortion and high sound quality, low DC resistance, and high current; The product adopts a 2-in-1 structure, saving space; Magnetic shielding structure with strong resistance to electromagnetic interference (EMI).
2.2 High current digital power amplifier inductor CPD series
The CODACA high current digital power amplifier inductor CPD series adopts low loss magnetic core material and high-temperature resistant copper wire, with high inductance value and high current, which can achieve high power output and high sound quality. The product adopts a magnetic shielding structure and has strong anti electromagnetic interference (EMI) performance.
2.3 High current digital power amplifier inductor CPE series
The CODACA high current digital power amplifier inductor CPE series adopts a group vertical 2-in-1 design, effectively saving space. The product uses low loss magnetic core materials and high-temperature resistant copper wire, with small volume, high current, low magnetic loss, and low temperature rise current and saturation current affected by environmental conditions.
2.4 Molded digital amplifier inductor CSAD series
The CSAD series of CODACA integrated digital amplifier inductors adopts a low loss alloy magnetic powder core design, which has excellent soft saturation characteristics and can handle high transient current peaks. The 2-in-1 low coupling structure design saves installation area while significantly improving signal-to-noise ratio and reducing harmonic distortion. Magnetic shielding structure, strong anti-interference ability.
