Monolithic Power Systems Inc. EV6919-S-00A

Overview

EV6919-S-00A from Monolithic Power Systems is a high-efficiency synchronous rectification evaluation board for the MP6919GS intelligent rectifier IC, featuring an integrated 100V/13mΩ MOSFET, 40mV regulated forward voltage drop, and self-powered operation without auxiliary winding-designed for flyback converters in USB PD and QC laptop adapters.

For engineers reviewing the EV6919-S-00A datasheet, EV6919-S-00A pinout, EV6919-S-00A application, or EV6919-S-00A equivalent, this board enables rapid validation of high-side/low-side synchronous rectification in DCM, CCM, and quasi-resonant flyback topologies with no external bias supply required.

Technical Context

The EV6919-S-00A implements the MP6919GS IC in a functional flyback synchronous rectification reference design, supporting input voltage ranges up to 100V drain-source and output voltages down to 0V. Its internal ringing detection circuit prevents false turn-on during discontinuous conduction mode transitions.

This board operates as a plug-in replacement for freewheel diodes in secondary-side rectification, using VD (drain), VS (source), and VDD (supply) terminals to interface directly with transformer secondary windings and ground return paths-enabling self-starting via internal charge pump.

Key Specifications

Availability

EV6919-S-00A is available at Aetrix Electronics and suitable for USB PD charger development, QC adapter qualification, and high-efficiency flyback converter prototyping requiring stable component supply and fast-turnaround evaluation hardware.

Supply support for EV6919-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 analog and power ICs, with expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP6919 product line targets secondary-side synchronous rectification in low-voltage, high-efficiency AC/DC adapters-designed to replace Schottky diodes while maintaining robust noise immunity and zero-auxiliary-winding operation.

FAQ

What is the primary function of the EV6919-S-00A evaluation board?

The EV6919-S-00A is a ready-to-use hardware platform that demonstrates the MP6919GS synchronous rectifier IC in a flyback converter's secondary side. It replaces conventional diodes to achieve higher efficiency by actively controlling the MOSFET's turn-on/turn-off based on real-time V_DS sensing and ringing detection.

How does the board interface with a flyback transformer secondary?

The board connects via three dedicated terminals: VD (drain) to transformer secondary high-side, VS (source) to output ground/common return, and VDD (supply) tied to VS. This allows direct integration into existing flyback layouts without auxiliary winding or external bias circuitry.

Does the EV6919-S-00A require an external power supply?

No. The board derives operating power entirely from the MP6919GS's internal charge pump, which self-starts from the V_DS waveform across the MOSFET. This eliminates the need for auxiliary windings or external bias supplies-critical for compact, low-output-voltage adapters.

Which conduction modes does the MP6919GS on this board support?

The MP6919GS supports discontinuous conduction mode (DCM), continuous conduction mode (CCM), and quasi-resonant (QR) operation. Its adaptive turn-off threshold and built-in ringing detection ensure reliable switching across all three modes without false triggering.

Can the EV6919-S-00A be used for high-side rectification?

Yes. The MP6919GS is explicitly designed for both high-side and low-side synchronous rectification configurations. The board's terminal labeling (VD, VS, VDD) and self-powered architecture make it compatible with either topology without hardware modification.

What safety certifications does this evaluation board target?

The EV6919-S-00A itself is not certified, but the MP6919GS IC is designed to support Energy Star-compliant power supplies. Its 40mV regulated forward voltage and precise turn-off timing help meet stringent efficiency requirements for Level VI and CoC Tier 2 standards.