Skip to main content
Reference DesignInfineon

User Manual for MERUS MA120xxx Reference Boards

User manual for Infineon MERUS MA120xxx reference boards featuring MA12040/MA12070 amplifiers, including schematics, BOM, and performance measurement data.

View reference design

Overview

This design document serves as a comprehensive user manual for the reference and demonstration boards for Infineon’s MERUS MA12040, MA12040P, MA12070, and MA12070P multi-level Class D audio amplifiers. It provides technical specifications for both analog and digital input models, covering supply voltage ranges from 5V to 26V and power outputs up to 2 x 80W. The document includes a full schematic, PCB layout, and a detailed bill of materials (BOM) featuring the Texas Instruments TPS62175 buck regulator and various passive components from TDK, Murata, and Bourns. Detailed measurement results are provided for efficiency, thermal characteristics, and EMI performance, alongside sample Arduino code for I2C device configuration.

Use Cases

  • Rapid prototyping of high-efficiency audio systems
  • Evaluating multi-level Class D amplifier technology
  • Design-in reference for filterless audio applications
  • Development of energy-efficient consumer audio products

Topics

Infineon
MERUS
MA12040
MA12040P
MA12070
MA12070P
Class D Amplifier
Multi-level Audio
Reference Design
TPS62175
Audio Performance
BTL

Referenced Parts

2743019447

Fair-Rite

SMD ferrite power bead, Z = 47 Ω

TPS62175DQCT

Texas Instruments

Buck regulator: TPS62175 – for generating 5 V supply

BLE32PN300SN1L

Murata

EMI filter: Murata ferrite BLE32PN300SN1L + 1 nF capacitor

GRM21BR61A226ME51L

Murata

COUTBUCK CAP 22 μF 50 V ±10 percent 0805 Murata GRM21BR61A226ME51L 1

UMK212BB7225KG-T

Taiyo Yuden

CINBUCK CAP 2.2 μF 50 V ±10 percent, 0805 Taiyo Yuden UMK212BB7225KG-T 1

RC0201JR-070RL

Yageo

RPBTL Jumper 0201 (0603 metric) Yageo RC0201JR-070RL 7

MA12040

Infineon

MA12040, MA12040P, MA12070 and MA12070P proprietary multi-level amplifiers

MA12040P

Infineon

MA12040, MA12040P, MA12070 and MA12070P proprietary multi-level amplifiers

MA12070

Infineon

MA12040, MA12040P, MA12070 and MA12070P proprietary multi-level amplifiers

MA12070P

Infineon

MA12040, MA12040P, MA12070 and MA12070P proprietary multi-level amplifiers

74279221100

Wurth Electronics

Pi filter on PVDD – Würth ferrite 74279221100 + 2 x 22 nF capacitor

MA120xx

Infineon

U1 Multi-level Class D amplifier Infineon MA120xx 1

RC0402FR-072ML

Yageo

2 M 0.063 W 1 percent 0402 (1005 metric) SMD

RC0402FR-07383KL

Yageo

383 K 0.063 W 1 percent 0402 (1005 metric) SMD

TMK212BBJ106MG-T

TDK

0805 TDK TMK212BBJ106MG-T 8

RC0402FR-072ML

Yageo

metric) SMD Yageo RC0402FR-072ML 1

RC0402FR-07383KL

Yageo

metric) SMD Yageo RC0402FR-07383KL 1