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UG004855
MERUS™ 400 W single power supply audio
amplifier
REF_MA5302BTLSPS_400W
About this document
Scope and purpose
The REF_MA5302BTLSPS_400W Reference Board is a single-channel BTL Class D audio power amplifier,
delivering 400 W per channel (4 Ω at 53 V) for audio systems. This reference board showcases how to use the
MERUS™ MA5302M IC with a single power supply and demonstrates the optimal PCB layout for Infineon's
integrated Class D IC.
Intended audience
This document is intended for audio design engineers who are utilizing the REF_MA5302BTLSPS_400W
Reference Board from Infineon for evaluation and design.
Reference Board/Kit
Product(s) embedded on a PCB with a focus on specific applications and defined use cases that may include
software. PCB and auxiliary circuits are optimized for the requirements of the target application.
Note:
Boards do not necessarily meet safety, EMI, quality standards (for example UL, CE) requirements
User guide
Please read the sections "Important notice" and "Warnings" at the end of this document
V 1.0
www.infineon.com
2024-10-23
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Summary of Contents for Infineon MERUS 400 W
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Page 1: About This Document
400 W per channel (4 Ω at 53 V) for audio systems. This reference board showcases how to use the MERUS™ MA5302M IC with a single power supply and demonstrates the optimal PCB layout for Infineon’s integrated Class D IC. -
Page 2: Important Notice
Infineon Technologies. The design of the Evaluation Boards and Reference Boards has been tested by Infineon Technologies only as described in this document. The design is not qualified in terms of safety requirements, manufacturing and operation over the entire operating temperature range or lifetime. -
Page 3: Safety Precautions
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Safety precautions Safety precautions Note: Please note the following warnings regarding the hazards associated with development systems Table 1 Safety precautions Warning: The DC link potential of this board is up to 1000 VDC. When measuring voltage waveforms by oscilloscope, high voltage differential probes must be used. -
Page 4: Table Of Contents
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Table of contents Table of contents About this document ........................1 Important notice ..........................2 Safety precautions .......................... 3 Table of contents ..........................4 Introduction .......................... 5 Applications ............................. 5 Features ..............................5 Specifications ........................ -
Page 5: Introduction
400 W per channel (4 Ω at 53 V) for audio systems. This reference board showcases how to use the MERUS™ MA5302M IC with a single power supply and demonstrates the optimal PCB layout for Infineon’s integrated Class D IC. -
Page 6: Specifications
2 Vrms input yields 400 W Table 3 Electrical data Data Typical Notes/conditions MA5302MS integrated Class D IC Infineon devices Modulator Self-oscillating, second-order sigma-delta modulation, analog input Output power: (1 percent THD+N) 300 W 1 kHz, RL = 4 Ω Output power: (10 percent THD+N) 400 W 1 kHz, RL = 4 Ω... -
Page 7: Overview
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Overview Overview The REF_MA5302BTLSPS_400W features a one BTL channel self-oscillating type PWM modulator for the lowest component count, convenient single power supply and highest performance, and robust design. This topology represents an analog version of a second-order sigma-delta modulation, with the Class D switching stage inside the loop. -
Page 8: Hardware Set Up
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Hardware set up Hardware set up Connector connection Figure 3 Connectors connection User guide V 1.0 2024-10-23... -
Page 9: Audio Analyzer Setup
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Hardware set up Table 4 Connector description Connector Description ANALOG INPUT Analog unbalanced input OUTPUT Analog balanced output POWER Single power supply Audio analyzer setup Figure 4 Audio analyzer connection User guide V 1.0 2024-10-23... -
Page 10: Evaluation Board Operation
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Evaluation board operation Evaluation board operation Test set up 1. Connect 4 Ω, >450 W dummy loads to output connector (J1 as shown in Figure 3) and parallel it with the input of the audio precision (AP) analyzer. -
Page 11: Audio Performance
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Audio performance Audio performance Power vs. THD+N Test conditions: • VBUS = 53 V • Input signal = 1 kHz • Load impedance = 4 Ω • F = 400 kHz Figure 5 Power vs. -
Page 12: Frequency Response
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Audio performance Frequency response Test conditions: • VBUS = 53 V • Output power = 1 W • Load impedance = 4 Ω • F = 400 kHz Figure 6 Frequency response 4 Ω load Noise floor Test conditions: •... -
Page 13: Rms Output
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Audio performance Noise floor with 1 V output Test conditions: • VBUS = 53 V • Output = 1 V at 1 kHz • Load impedance = 4 Ω • F = 400 kHz Figure 8 Noise floor with 1 V... -
Page 14: Efficiency
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Efficiency Efficiency Test conditions: • VBUS = 53 V • Output = 1 kHz • Load impedance = 4 Ω • F = 400 kHz REF_MA5302BTLSPS_400W 100.0% 80.0% 60.0% 40.0% 20.0% 0.0% 100.0 200.0 300.0... -
Page 15: Thermal Information
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Thermal information Thermal information Test conditions: • VBUS = 53 V • Input signal = 1 kHz • Both channels are driven • F = 400 kHz • Load = 4 Ω Thermal performance Table 5 Thermal performance (with heatsink) - Page 16 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Thermal information Figure 11 Peak power P = 400 W with 4 Ω load 53 V with heatsink 1 minute Note: Maximum temperature 144°C at 1 minute. Figure 12 Peak power P = 400 W with 4 Ω...
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Page 17: Heatsink
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Thermal information Heatsink Figure 13 Heatsink User guide V 1.0 2024-10-23... -
Page 18: Gain Setting
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Gain setting Gain setting The REF_MA5302BTLSPS_400W Reference Board has two gain settings for the single power supply application, which is different from the split power supply application. The AC gain setting (red path in Figure 14) is the same as the normal gain setting, the ratio of RFB and Rin is the AC gain. -
Page 19: Vbus Calculation
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Gain setting VBUS calculation VBUS is calculated by the load impedance and 10% clipping power (typically 75% of RMS power). �� �� 2 ∗ ∗ .75 ∗ √ ���������������� �������� �� ������... - Page 20 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Gain setting Target preamp voltage gain: �� ������(����������) ���� (����������) �� ����(����������) 30�� ���� (����������) 4.3 �� ���� Equation 3 Target Class D voltage gain: ���� (����������) ���� ∗ 2 (���������� ��) ����...
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Page 21: Dc Gain Setting
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Gain setting Total system voltage gain Av ���� 20 log ���� (����) (����������) ���� 20 log 24 = 27.6 ���� (����) Equation 9 DC gain setting DC gain sets the speaker output DC bias point to half of the VBUS for maximum output, referring to Figure DC gain (Av ��... -
Page 22: Schematics
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Schematics Schematics Figure 17 Class D output stage User guide V 1.0 2024-10-23... - Page 23 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Schematics Figure 18 Preamplifier Figure 19 VREF User guide V 1.0 2024-10-23...
- Page 24 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Schematics Figure 20 Figure 21 Undervoltage protection User guide V 1.0 2024-10-23...
- Page 25 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Schematics Figure 22 Power supply input User guide V 1.0 2024-10-23...
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Page 26: Pcb Layout
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W PCB layout PCB layout 11.1 PCB fabrication recommendations Figure 23 PCB fabrication notes User guide V 1.0 2024-10-23... -
Page 27: Pcb Layout
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W PCB layout 11.2 PCB layout Figure 24 Board top view User guide V 1.0 2024-10-23... - Page 28 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W PCB layout Figure 25 Board bottom view User guide V 1.0 2024-10-23...
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Page 29: Bill Of Materials (Bom)
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Bill of materials (BOM) Bill of materials (BOM) Table 6 REF_MA5302BTLSPS_400W board BOM Part number Designator Description Qty Vendor PCE3914CT-ND C1, C2, C11 CAP ALUM 10UF 20% 50V SMD DigiKey 490-1459-6-ND C3, C4, C6, CAP CER 2200PF 50V C0G/NP0 0603 DigiKey... - Page 30 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Bill of materials (BOM) Part number Designator Description Qty Vendor ES1DFSTR-ND D10, D11 DIODE GEN PURP 200V 1A DO214AC DigiKey MMSZ4714T1GOSCT-ND DIODE ZENER 33V 500MW SOD123 DigiKey MM3Z24VT1GOSCT-ND DIODE ZENER 24V 300MW SOD323 DigiKey ATS-FPS058037011-32-C1- HEATSINK 57.9X36.83X11.43MM FP...
- Page 31 MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Bill of materials (BOM) Part number Designator Description Qty Vendor 541-5.10KFCT-ND RES SMD 5.1K OHM 1% 1/4W 1206 DigiKey 541-47.5KCCT-ND RES SMD 47.5K OHM 1% 1/8W 0805 DigiKey 311-10.0KCRCT-ND RES 10K OHM 1% 1/8W 0805 DigiKey P41.2KCCT-ND RES SMD 41.2K OHM 1% 1/8W 0805...
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Page 32: Revision History
MERUS™ 400 W single power supply audio amplifier REF_MA5302BTLSPS_400W Revision history Revision history Document Date Description of changes revision 2024-10-23 Initial release User guide V 1.0 2024-10-23... -
Page 33: Disclaimer
For information on the types in question please contact your nearest Published by Infineon Technologies office. Except as otherwise explicitly approved by Infineon Infineon Technologies AG Technologies in a written document signed by 81726 Munich, Germany authorized...
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