Monolithic Power Systems Inc. EV7722DF-02A

Overview

EV7722DF-02A from Monolithic Power Systems is an evaluation board for the MP7722DF stereo Class D audio amplifier IC, delivering 2×20W into 4Ω loads from a single 24V supply. It implements MPS's AAM™ variable-frequency modulation topology with integrated 180mΩ MOSFETs, mute/standby control, and pop-free startup/shutdown-designed for flat-panel TV and multimedia computer audio subsystem validation.

For engineers reviewing the EV7722DF-02A datasheet, EV7722DF-02A pinout, EV7722DF-02A application, or EV7722DF-02A equivalent, this board enables rapid functional verification of MP7722DF-based Class D amplifier designs-including THD+N characterization (0.08% at 1W/8Ω), efficiency validation (>90% at 20W), and single-supply operation across 9.5–24V.

Technical Context

The EV7722DF-02A implements a capacitor-divider-based single-ended output architecture supporting dual-channel stereo amplification. It integrates the MP7722DF TSSOP20F IC with external passive components-including 10µH inductors (L1/L2), 470µF/1000µF bulk capacitors, and 22pF/390pF high-stability C0G timing capacitors-to stabilize the AAM™ modulation loop and suppress EMI.

Board-level features include hardware-enable toggle (SW1), test points (TP1), RCA input jacks (CN1/CN2), banana output terminals (CN3), and optional protection circuitry (D3/D6, R25/R33). The design supports both 24V default and field-modifiable 12V operation via component swaps per the Quick Start Guide.

Key Specifications

Availability

EV7722DF-02A is available at Aetrix Electronics and suitable for flat-panel television audio validation, multimedia computer speaker system prototyping, and DVD/surround sound amplifier reference design requiring stable component supply and documented performance traceability.

Supply support for EV7722DF-02A 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 EV7722DF-02A belongs to MPS's evaluation board product line, developed specifically to accelerate customer adoption of their second-generation integrated Class D audio solutions-emphasizing small footprint, pop-free operation, and single-supply simplicity.

FAQ

What is the primary function of the EV7722DF-02A?

The EV7722DF-02A is a fully assembled evaluation board for the MP7722DF stereo Class D audio amplifier IC. Its purpose is to enable engineers to validate audio performance metrics-including THD+N, efficiency, frequency response, and enable sequencing-without designing a custom PCB. It ships pre-configured for 24V operation with all critical passives and layout-optimized routing.

Can the EV7722DF-02A operate from a 12V supply?

Yes-the board supports 12V operation via documented component modifications: replace C6 with 1.8nF and C15 with 2.2nF, remove R23/R26/R31, and change R10/R16 from 20kΩ to 10kΩ. These changes adjust feedback network gain and bootstrap timing to maintain stable AAM™ modulation under reduced rail voltage.

Does the board include short-circuit or thermal protection?

The EV7722DF-02A inherits the MP7722DF's internal protection features-including short-circuit detection, overtemperature shutdown, and pop-free startup/shutdown-but does not add discrete thermal sensors or external current-limiting FETs. Protection behavior is verified through the IC's built-in fault flag and automatic recovery sequence.

What speaker impedances are supported?

The board is validated for 4Ω and 8Ω speakers, as specified in the Quick Start Guide. Output stage stability and power delivery are characterized up to 20W per channel into 4Ω at 24V; operation into lower impedances (e.g., 2Ω) is not supported and may trigger IC overcurrent protection.

Is there a schematic and layout available for this board?

Yes-the official EV7722DF-02A Rev. 1.1 documentation includes full schematic (page 2), bill of materials (pages 3–4), top/bottom PCB layer diagrams (page 6), and connection diagram (page 6). All files are publicly hosted on Monolithic Power Systems' website under the MP7722 product page.

How is audio input connected?

Audio input is accepted via two female RCA jacks (CN1 and CN2), labeled IN1 and IN2, accepting line-level analog signals from 0VRMS to 1VRMS. Input coupling is AC-coupled through onboard 2.2µF electrolytic capacitors (C4/C9), with no onboard gain adjustment-system gain is set by the MP7722DF's fixed internal architecture.

What is the role of SW1 on the board?

SW1 is a slide switch that controls the EN (enable) signal routed to the MP7722DF's EN1 and EN2 pins. In ENABLE position, it applies VDD to the enable inputs, powering up both channels; in DISABLE position, it grounds EN1/EN2, placing the IC in standby mode with <100µA quiescent current and eliminating turn-on/turn-off pops.