Monolithic Power Systems Inc. EV6925-S-00A

Overview

EV6925-S-00A from Monolithic Power Systems is an evaluation board for the MP6925GS dual-channel synchronous rectifier controller, configured for LLC resonant converter topologies with center-tapped secondary windings. It replaces Schottky diodes with low-R_DS(on) MOSFETs to achieve high-efficiency rectification, supports CCM/CrCM/DCM operation modes, operates from 4.2–35V V_DD, and delivers fast 35ns total turn-off delay.

For engineers reviewing the EV6925-S-00A datasheet, EV6925-S-00A pinout, EV6925-S-00A application, or EV6925-S-00A equivalent, this board enables rapid validation of MP6925GS-based synchronous rectification in AC-DC adapters, PC power supplies, and isolated DC/DC converters under real-world LLC operating conditions including light-load efficiency and dynamic load transient response.

Technical Context

The EV6925-S-00A implements a dual-gate-drive synchronous rectification solution targeting LLC resonant converters with center-tapped secondaries. It interfaces directly with two N-channel MOSFETs (e.g., Si7478DP), monitors V_D1/V_D2 and V_G1/V_G2 nodes, and uses internal timing logic to drive high-side and low-side rectifiers independently.

Board-level design includes input/output bulk capacitors (2200μF ×2, 10μF), gate-drive RC networks, 1nF snubber, and 470pF timing capacitors. It operates across full-load (7.5A) and light-load (0.75A) conditions at 12V output, with V_DD supplied from 12V auxiliary rail and quiescent current as low as 175μA in light-load mode.

Key Specifications

Availability

EV6925-S-00A is available at Aetrix Electronics and suitable for AC-DC adapter development, PC power supply qualification, and isolated DC/DC converter prototyping requiring stable component supply, validated reference designs, and fast-turnaround evaluation hardware.

Supply support for EV6925-S-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 power management ICs, including DC/DC converters, LED drivers, motor drivers, and synchronous rectifier controllers.

The MP6925GS product line targets high-efficiency secondary-side rectification in resonant topologies, specifically designed to replace Schottky diodes in LLC and SR flyback converters while maintaining robust noise immunity and adaptive timing control.

FAQ

What topology does the EV6925-S-00A support?

The EV6925-S-00A is configured exclusively for LLC resonant converters with center-tapped secondary windings. It drives two N-channel MOSFETs in complementary high-side and low-side synchronous rectification roles, and does not support forward, flyback, or non-center-tapped topologies without hardware modification.

Which IC is mounted on the EV6925-S-00A board?

The board integrates the MP6925GS - a dual-channel synchronous rectifier controller in SOIC-8 package - which provides independent gate drive outputs (VG1/VG2), voltage sensing inputs (VD1/VD2), and ground-referenced control logic (VSS, PGND). No other controller IC is present.

Can the EV6925-S-00A be used with logic-level MOSFETs?

Yes. The MP6925GS on this board supports both standard-threshold (≥4.5V V_GS) and logic-level (≤2.5V V_GS) N-channel MOSFETs via adjustable gate drive strength and adaptive turn-on/turn-off timing, verified with Si7478DP (4.5V threshold) in test reports.

What are the physical dimensions and mounting features?

The board measures 6.3cm × 6.3cm × 3cm and includes four plastic pillars for mechanical standoff, three 2.0mm copper cylinders for current-sense or transformer connection points (CT1, LS1, LS2), and six 1.0mm copper cylinders for signal/power node access (VD1, VD2, VG1, VG2, VS1, VS2).

Does the board support both high-side and low-side rectification simultaneously?

Yes. The MP6925GS on EV6925-S-00A independently controls two gate outputs (VG1/VG2) with dedicated drain sensing (VD1/VD2) and shared ground reference (VSS/PGND), enabling true concurrent high-side and low-side synchronous rectification in center-tapped LLC configurations as confirmed in waveform test data.

Is RoHS compliance documented for this evaluation board?

Yes. All components on EV6925-S-00A - including the MP6925GS IC, Si7478DP MOSFETs, TDK and Murata capacitors, and Yageo resistors - are lead-free, halogen-free, and RoHS-compliant per MPS documentation and bill-of-materials sourcing records.