Monolithic Power Systems Inc. EV6903DS-00A

Overview

EV6903DS-00A from Monolithic Power Systems is an evaluation board for the MP6903DS synchronous rectifier controller, designed to replace Schottky diodes in LLC resonant converters. It supports high-side and low-side configurations, operates from 8–24V VDD, delivers <300μA quiescent current in light-load mode, and enables up to 400kHz switching with 20ns total turn-off delay.

For engineers reviewing the EV6903DS-00A datasheet, EV6903DS-00A pinout, EV6903DS-00A application, or EV6903DS-00A equivalent, this board provides validated reference design, BOM documentation, and layout files for rapid integration into industrial power systems, distributed power architectures, and battery-powered DC-DC stages requiring >95% rectification efficiency.

Technical Context

The EV6903DS-00A implements a self-biased gate driver architecture that senses drain-source voltage (VD–VS) to control MOSFET timing without auxiliary windings. It supports continuous conduction mode (CCM), critical conduction mode (CrCM), and discontinuous conduction mode (DCM) operation across wide load ranges.

Its fast 20ns turn-off delay minimizes reverse conduction loss during transition, while the 8–24V VDD range accommodates both standard and logic-level MOSFETs. The board integrates a pre-mounted AP85T10GP 100V/8mΩ TO-220 N-channel MOSFET and includes provisions for external MOSFET substitution via solder pads.

Key Specifications

Availability

EV6903DS-00A is available at Aetrix Electronics and suitable for industrial power systems, distributed power architectures, and battery-powered DC-DC converters requiring stable component supply, repeatable validation, and production-ready reference designs.

Supply support for EV6903DS-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, motor drivers, and power management solutions.

The MP6903DS product line targets high-efficiency secondary-side synchronous rectification in AC-DC and isolated DC-DC converters, specifically engineered to replace Schottky diodes in LLC, flyback, and forward topologies while meeting global energy efficiency standards.

FAQ

What is the primary function of the EV6903DS-00A evaluation board?

The EV6903DS-00A is a fully assembled and tested reference platform for the MP6903DS synchronous rectifier controller. It demonstrates high-efficiency replacement of Schottky diodes using an N-channel MOSFET in LLC resonant converters, with validated layout, BOM, and startup procedure.

Can I substitute the onboard MOSFET with my own device?

Yes. The board includes solder pads and routing for external MOSFET connection. Q1 (AP85T10GP) can be removed, and custom devices-whether standard or logic-level-can be mounted using the same VS, VG, and VD terminals per the schematic and layout documentation.

Does the EV6903DS-00A require external programming or configuration?

No. The MP6903DS is a fully autonomous analog controller with no pins for configuration, trimming, or digital interface. Operation is determined by internal circuitry and external passive components; no firmware, EEPROM, or host communication is involved.

What input voltage range does the board support for VDD biasing?

The board accepts 8–24V DC on the VDD pin, matching the MP6903DS's native supply range. This allows direct connection to auxiliary windings or regulated rails without additional regulation, supporting both universal-input and wide-range industrial supplies.

How is synchronization achieved without a controller-side signal?

Synchronization is achieved through self-timed sensing of the MOSFET's drain-to-source voltage (VD–VS). The MP6903DS detects zero-voltage crossing and body-diode conduction onset to trigger gate drive, eliminating need for timing signals from the primary-side controller.

Is the board compliant with Energy Star 1W standby requirements?

Yes. With <300μA quiescent current in light-load mode and automatic entry into low-power state below threshold load, the EV6903DS-00A-when used with MP6903DS-meets Energy Star Level VI 1W standby power specifications for external power supplies.