Monolithic Power Systems Inc. EV7720DS-00A

Overview

EV7720DS-00A from Monolithic Power Systems is an evaluation board for the MP7720 mono 20W Class D audio amplifier IC, implementing a single-ended capacitor-divider output stage delivering 20W into 4Ω speakers at 24V supply, with THD+N of 0.08% at 1W/8Ω and 90% efficiency at full load. It supports 9.5–24V single-supply operation and integrates startup/shutdown pop elimination, mute/standby control, thermal protection, and short-circuit protection.

For engineers reviewing the EV7720DS-00A datasheet, EV7720DS-00A pinout, EV7720DS-00A application, or EV7720DS-00A equivalent, this board enables rapid validation of MP7720-based stereo audio amplification in consumer display and home entertainment systems requiring low-THD, high-efficiency Class D performance without supply pumping.

Technical Context

The EV7720DS-00A implements two identical MP7720 Class D amplifier channels in stereo configuration, each using MPS's proprietary AAM™ (Analog Adaptive Modulation) variable-frequency topology to achieve >90% efficiency and excellent PSRR. The board operates from a single DC supply (9.5–24V), eliminating need for charge pumps or dual rails.

Each channel features integrated 180mΩ MOSFETs, internal startup/shutdown pop suppression, and configurable enable/mute logic via front-panel switch. Output filtering uses discrete LC networks (L1/L2, C7/C8, C17/C18) and Schottky diodes (D6/D8) for robust single-ended Class D drive into 4Ω or 8Ω loads.

Key Specifications

Availability

EV7720DS-00A is available at Aetrix Electronics and suitable for surround sound DVD systems, flat panel monitors, and home stereo systems requiring stable component supply, reference-grade audio validation, and fast-turn prototyping support.

Supply support for EV7720DS-00A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with core expertise in DC/DC conversion, LED drivers, and Class D audio amplifiers.

The MP7720 and its EV7720DS-00A evaluation platform belong to MPS's second-generation fully integrated Class D audio amplifier product line, designed specifically to replace traditional Class AB solutions in space- and efficiency-sensitive consumer audio applications.

FAQ

What input signal level does EV7720DS-00A accept?

The board accepts 0–1V_RMS audio input signals on RCA jacks CN100 and CN101. This range aligns with standard line-level outputs from DVD players, set-top boxes, and media PCs, ensuring compatibility without external attenuation or gain staging.

Can EV7720DS-00A operate from a 12V supply?

Yes - the board supports 12V operation after hardware modifications: replace C11 with 2.2nF and C12 with 1.8nF, remove R22/R24/R113, and change R1/R2 from 20kΩ to 10kΩ. These changes adjust feedback and bootstrap timing for stable 12V switching behavior.

Does the board include speaker output protection?

Yes - each channel incorporates short-circuit protection and thermal shutdown circuitry inherited from the MP7720 IC. The board also uses Schottky diodes (B130B) and ferrite beads (BS43) to suppress voltage transients and reduce EMI-induced latch-up risk.

What is the role of the AAM™ topology in this evaluation board?

AAM™ (Analog Adaptive Modulation) is MPS's proprietary variable-frequency modulation scheme used in the MP7720. On this board, it delivers fast transient response, high PSRR (>60dB at 100Hz), and consistent THD+N performance across supply and load variations - critical for clean audio in unregulated consumer power environments.

How is pop noise suppressed during power-up and power-down?

Pop suppression is implemented via integrated circuitry inside the MP7720, including controlled ramp-up/ramp-down of bias currents and output stage sequencing. The board's EN switch (SW100) activates this feature - no external components are required for silent turn-on/turn-off behavior.

What speaker impedances are supported?

The board is validated for both 4Ω and 8Ω speakers. At 24V, maximum output is 20W into 4Ω or ~10W into 8Ω. Load impedance selection affects peak current draw and thermal dissipation but requires no board modification - only appropriate speaker wiring.