In February 2025, Codaca’s CPD2315-100M inductor for digital amplifier was released in Infineon lasted audio amplifier reference design REF_MA5302BTLSPS_400W. This reference design adopts Codaca’s CPD2315-100M for output filtering, delivering high audio quality, low noise, and high efficiency. It is suitable for smart speakers, active loudspeakers, instrument amplifiers, car audio amplifiers, smart speaker designs, and audio system solutions.
1. Solution Overview
REF_MA5302BTLSPS_400W is a single-channel BTL Class-D audio power amplifier that features a minimal component count, single power supply operation, high performance, and robust design, providing up to 400 W (4 Ω, 53 V) per channel for audio systems. This reference design demonstrates how to integrate the MA5302M IC with a single power supply and showcases the optimal PCB layout for Infineon’s Class-D IC. It also provides all the necessary internal power management for ease of use.
Figure 1 shows the Infineon digital amplifier evaluation board REF_MA5302BTLSPS_400W, which incorporates Codaca’s self-developed and manufactured high-current digital audio amplifier inductor CPD2315-100M, known for its high saturation current, low DCR, and low temperature rise.
Figure 1 Infineon Digital Amplifier Evaluation Board REF_MA5302BTLSPS_400W
(Image and information source: Infineon Website)
Figure 2 Single Power Supply BTL Amplifier Circuit Diagram
2. Audio Testing
2.1 Test Conditions:
VBUS: 53 V
Input Signal: 1 kHz
Load Impedance: 4 Ω
FPWM: 400 kHz
(Figure 3 Power vs. THD+N test with 4 Ω load)
(Figure 4 Frequency response test with 4 Ω load)
(Figure 5 REF_MA5302BTLSPS stereo test with 4 Ω load, VBUS = 53 V)
(Figure 6 Partial BOM list of REF_MA5302BTLSPS_400W)
2.2 Test Results:
The audio performance test shows that, with the use of advanced IC chips, power solutions, and the proper selection of inductors, the digital audio amplifier exhibits excellent audio performance: THD+N ≤ 0.05% (100W, 1kHz), Frequency response: 20 Hz – 20 kHz, Efficiency ≥ 90% at 400W output power, delivering high-fidelity audio performance, high efficiency, and high output power.
3. High-Performance Inductors Elevate Digital Amplifier Sound Quality
The digital audio amplifier inductor CPD2315-100M, selected for Infineon’s REF_MA5302BTLSPS_400W, is independently developed by Codaca.
With 24 years of expertise in power inductor development, Codaca is a leading magnetics supplier, providing high-reliability inductor solutions and customization services for global clients across various industries.
To meet the design demands of digital audio amplifiers — compact size, high power, low distortion, and high reliability — Codaca has developed multiple series of digital audio amplifier inductors, including CPD, CSD, CPE, CSAD, VSAD, VSAD-T, and VPD. These series are widely used in automotive audio, professional stage audio systems, and home theater designs. Among them, the CPD series is featured in multiple Infineon digital audio amplifier reference designs.
(Figure 7 Codaca CPD2315-100M Digital Audio Amplifier Inductor)
3.1 Product Features
The CPD2315-100M, selected for this reference design, offers the following technical advantages:
◾ Wide-temperature, high-frequency magnetic core material with minimal impact on electrical performance under varying environmental temperatures, ensuring low loss and high efficiency.
◾ Excellent frequency response and current linearity, effectively reducing or eliminating nonlinear distortion in audio signals.
◾ Ultra-fast signal transmission capability for superior sound quality output.
◾ Outstanding shielding performance with strong electromagnetic interference (EMI) suppression, minimizing external interference with amplifier performance.
◾ Compact package design, ideal for small-size, high-efficiency application solutions.
3.2 Electrical Characteristics
The CPD2315-100M features an inductance value of 10 μH, a saturation current of 39 A, and a temperature rise current of 14 A. With exceptional thermal stability, it operates reliably in environments ranging from -40°C to +125°C.
(CPD2315 Saturation Current Curve)
(CPD2315 Temperature Rise Current Curve)
4. Operating Environment
Temperature Range: -40°C to +125°C (including coil self-heating).
5. Environmental Compliance
Compliant with RoHS, REACH, and halogen-free requirements.
6. Production Status
Mass production available, Lead time: 6–8 weeks.
For more information or to request samples, please visit Codaca's official website or contact our sales team.
Reference Material:
MERUS™ 400W single power supply audio amplifier REF_MA5302BTLSPS_400W