Monolithic Power Systems Inc. EV7751-F-00A

Overview

EV7751-F-00A from Monolithic Power Systems is an evaluation board for the MP7751 20W stereo BTL Class D audio amplifier IC, supporting 5–26V single-supply operation and delivering up to 2×20W into 8Ω loads at 18V. It integrates 240mΩ MOSFETs, PLIMIT power control, startup/shutdown pop elimination, and advanced EMI suppression for TV, active speaker, and home theater applications.

For engineers reviewing the EV7751-F-00A datasheet, EV7751-F-00A pinout, EV7751-F-00A application, or EV7751-F-00A equivalent, this board enables rapid validation of MP7751's fixed-frequency Class D performance-including gain configuration (20–36 dB), PLIMIT-adjustable output power (5–20W), and InAbsence signal-detection timing-under real-world 4–8Ω speaker loads and 12V/18V supply conditions.

Technical Context

The EV7751-F-00A implements a complete reference design for the MP7751GF TSSOP-28 IC, featuring dual BTL output stages with integrated high-side/low-side MOSFETs and bootstrap circuitry (BST1A/BST1B/BST2A/BST2B). It supports both single-ended (via JP1/JP2/JP4) and differential input configurations, with configurable gain (GAIN0/GAIN1 jumpers) and programmable power limiting (PLIMIT pin).

Board-level features include EMI filtering (BLM41PG600SN1 ferrite beads), DC-blocking capacitors (1µF/16V C1/C5), output LC filters (22µH inductors L1–L4 + 0.68µF/50V C9/C17), and fault monitoring (FAULT pin tied to test point). The InAbsence function (C34 + JP5) provides ~160ms input-signal-absence delay before shutdown.

Key Specifications

Availability

EV7751-F-00A is available at Aetrix Electronics and suitable for TV audio subsystem validation, active speaker reference design, and home theater amplifier development requiring stable component supply and fast-turnaround evaluation capability.

Supply support for EV7751-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 core expertise in DC/DC conversion, LED drivers, and Class D audio amplifiers.

The MP7751 product line delivers fully integrated stereo Class D amplifiers targeting space-constrained consumer audio systems, emphasizing high efficiency (>90% at 9.5W × 2), low noise (120 µV typical), and robust protection (short-circuit, thermal, pop/click suppression).

FAQ

What input signal types does the EV7751-F-00A support?

The board accepts single-ended RCA inputs by default (JP1/JP2/JP4 installed). To use differential inputs, remove jumpers from JP2 and JP4 and route balanced signals to IN1A/IN1B and IN2A/IN2B pins. Input voltage range is 0–2 V_RMS, compatible with line-level consumer audio sources.

How is output power limited on this evaluation board?

Power limiting is controlled via the PLIMIT pin using a DC reference voltage. Default setting (R8/R9 divider) yields ~2.75 V (½ AVCC), enabling ~10 W × 2 output at 18 V. Adjusting the divider or shorting JP3 disables limiting. Table 1 in the user guide maps PLIMIT voltage to measured output power under defined test conditions.

Can the EV7751-F-00A drive 4 Ω speakers?

Yes - the MP7751 IC and board layout support 4 Ω loads. At 12 V supply, maximum output is ~9.5 W × 2 into 8 Ω; into 4 Ω, peak power increases but must remain within thermal and current limits (4 A max supply current). Ensure adequate heatsinking and verify THD+N remains below 10% at target output levels.

What is the purpose of the InAbsence function and how is it configured?

InAbsence detects loss of input signal and initiates a timed shutdown delay (~160 ms with C34 = 1 nF) before disabling the amplifier. It prevents audible pops during source switching. Disable it by shorting JP5; adjust delay time by changing C34 value per the formula T_delay = 1.6 × 10⁸ × R × C, where R = 10 kΩ (R8/R9).

Does the board include EMI mitigation components?

Yes - it integrates six BLM41PG600SN1 ferrite beads (FB1–FB6): two on each BTL output path (SW1A/SW1B/SW2A/SW2B) and two on PVCC rails. These suppress high-frequency switching noise above 100 MHz, meeting Class B EMI requirements for consumer audio equipment without external shielding.

Is the MP7751GF IC socketed or soldered on the EV7751-F-00A?

The MP7751GF is permanently soldered in TSSOP-28/EP package (U1) - not socketed. This ensures signal integrity for high-speed Class D switching and thermal coupling to the PCB copper pour. Replacement requires rework with appropriate hot-air desoldering tools and ESD precautions.