Monolithic Power Systems Inc. EV7748S-F-00A

Overview

EV7748S-F-00A from Monolithic Power Systems is a 2.1-channel Class D audio amplifier evaluation board built around the MP7748S IC, supporting both single-ended (30W ×2 into 4Ω) and BTL (60W into 8Ω) output configurations, with THD+N of 0.02% at 1W/1kHz and 93% efficiency at 40W BTL load, used for rapid prototyping of flat-panel TV and home stereo audio stages.

For engineers reviewing the EV7748S-F-00A datasheet, EV7748S-F-00A pinout, EV7748S-F-00A application, or EV7748S-F-00A equivalent, this board enables immediate validation of MP7748S performance in 2.1-channel SE/BTL topologies, supply range testing (9.5–36V), thermal behavior under 40W BTL load, and pop-noise suppression during startup/shutdown.

Technical Context

The EV7748S-F-00A implements a dual-channel + subwoofer (2.1) configuration using two MP7748S ICs-one for left/right SE outputs and one configured in BTL for subwoofer drive-leveraging MPS's proprietary AAM™ variable-frequency modulation topology to achieve fast transient response and low distortion across 20Hz–20kHz.

It supports factory-default 24V BTL operation with configurable VDD shutdown thresholds (via R16), differential input capability (jumper CN2 removal), and integrated protection including short-circuit detection, undervoltage lockout (UVP), and thermal foldback-all accessible via labeled test points and headers (L-IN1, R-IN1, Sub IN+1, Sub IN-1, EN, EXT_EN).

Key Specifications

Availability

EV7748S-F-00A is available at Aetrix Electronics and suitable for flat-panel TV audio subsystem development, portable docking station reference design validation, and home stereo 2.1-channel amplifier qualification requiring stable component supply and documented thermal performance.

Supply support for EV7748S-F-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 over two decades of leadership in DC/DC conversion, LED drivers, and Class D audio solutions.

The EV7748S-F-00A belongs to MPS's audio evaluation board product line, designed specifically to accelerate adoption of their fully integrated Class D amplifiers-including integrated MOSFETs, pop-noise suppression, and single-supply operation-for consumer audio applications demanding small footprint and high efficiency.

FAQ

What power supply voltage range is supported by the EV7748S-F-00A?

The board accepts 9.5 V to 36 V DC input, with factory default set for 24 V BTL operation. Modifications to resistor R16 enable reliable 12 V or 30 V operation while maintaining UVP thresholds per MP7748S datasheet Table 2 frequency optimization guidelines.

How do I configure the board for differential input?

To enable differential input mode, remove jumper CN2 located near the audio input section. This disconnects the internal bias network and allows externally referenced balanced signals to be applied directly to L-IN1/R-IN1 and Sub IN+1/Sub IN-1 terminals as specified in the MP7748S functional block diagram.

Does the board include thermal protection circuitry?

Yes-the underlying MP7748S IC integrates thermal foldback and shutdown, and the EV7748S-F-00A layout provides 2 oz copper pour on both layers with thermal vias under the TSSOP-28 EP pads. Board-level temperature rise remains below 45°C at 40 W BTL continuous output with 200 LFM airflow.

Can I use this board to evaluate both stereo and mono BTL modes simultaneously?

Yes-the board implements true 2.1-channel operation: left/right channels operate in SE mode (30 W each into 4 Ω), while the third channel uses BTL configuration (60 W into 8 Ω) for subwoofer drive. All three outputs are independently controllable via separate EN and input paths.

What speaker impedances are validated for safe operation?

The board is validated for 4 Ω (SE mode) and 8 Ω (BTL mode) loads. Operation into 6 Ω is permissible but requires derating to ≤35 W BTL to maintain junction temperature within MP7748S SOA limits, as confirmed by thermal imaging in the EV7748S-F-00A Rev. 1.0 test report.

Is the MP7748S IC on the board lead-free and RoHS-compliant?

Yes-the MP7748S IC mounted on EV7748S-F-00A is lead-free and fully compliant with the EU RoHS directive. MPS confirms green status for this part on its official Quality Assurance portal, and all board-level passives meet RoHS requirements per manufacturer P/Ns listed in the BOM.