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.
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
Referenced Parts
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
| SRN4026-100M | Bourns | SRN4026-150M Bourns SRN4026-100M |
| 2512065007Y6 | Fair-Rite | SMD ferrite bead, Z = 56 Ω |
| 2743019447 | Fair-Rite | SMD ferrite power bead, Z = 47 Ω |
| MC0402X105K100CT | Multicomp | CAP, 1 μF, ± 10 percent, X5R, 10 V, 0402 |
| MC0603B104K500CT | Multicomp | CAP, 0.1 μF, ± 10 percent, X7R, 50 V, 0603 |
| MC0603X105K250CT | Multicomp | CAP, 1 μF, ± 10 percent, X7R, 25 V, 0603 |
| MC0805X105K500CT | Multicomp | CAP, 1 μF, 50 V, ± 10 percent, X5R, 0805 |
| GRM155R71H223KA12D | Murata | CAP, 0.022 μF, ± 10 percent, X7R, 50 V, 0402 |
| GRM21BR61A226ME51L | Murata | CAP 22 μF 50 V ±10 percent 0805 |
| UWT1V101MCL1GS | Nichicon | Electrolytic cap, UWT series, 100 μF, 35 V |
| C1005X7R1H102K050BA | TDK | CAP, 1000 pF, ±10 percent, X7R, 50 V, 0402 |
| TMK212BBJ106MG-T | Taiyo Yuden | CAP, 10 μF, ± 10 percent, X5R, 25 V, 0805 |
| UMK212BB7225KG-T | Taiyo Yuden | CAP 2.2 μF 50 V ±10 percent, 0805 |
| TPS62175DQCT | Texas Instruments | Buck regulator: TPS62175 – for generating 5 V supply |
| RC0201JR-070RL | Yageo | Jumper 0201 (0603 metric) |
| RC0402FR-07100KL | Yageo | 100 K 0.063 W 1 percent 0402 (1005 metric) SMD |
| BLE32PN300SN1L | Murata | EMI filter: Murata ferrite BLE32PN300SN1L + 1 nF capacitor |
| SRN4026-100M | Bourns | LBUCK SRN4026-150M Bourns SRN4026-100M 1 |
| GRM155R71H223KA12D | Murata | V, 0402 Murata GRM155R71H223KA12D 2 |
| GRM21BR61A226ME51L | Murata | COUTBUCK CAP 22 μF 50 V ±10 percent 0805 Murata GRM21BR61A226ME51L 1 |
| UWT1V101MCL1GS | Nichicon | 35 V Nichicon UWT1V101MCL1GS 2 |
| C1005X7R1H102K050BA | TDK | 0402 TDK C1005X7R1H102K050BA 4 |
| 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 |
| RC0402FR-07100KL | Yageo | metric) SMD Yageo RC0402FR-07100KL 1 |
| SRN4026-150M | Bourns | LBUCK SRN4026-150M Bourns SRN4026-100M 1 |
| 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 |