Monolithic Power Systems Inc. EV3910-K-00A

Overview

EV3910-K-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP3910GK peak current mode PWM controller for flyback power conversion. It supports 36–72 V input, delivers 12 V / 2.5 A output, operates at 250 kHz switching frequency, and integrates a 1 A gate driver for external MOSFETs in telecom and brick-module applications.

For engineers reviewing the EV3910-K-00A datasheet, EV3910-K-00A pinout, EV3910-K-00A application, or EV3910-K-00A equivalent, this board enables rapid validation of MP3910GK-based isolated DC-DC designs with pulse-skipping light-load efficiency, hiccup-mode OVP/OLP/SCP protection, and programmable 30–400 kHz frequency tuning.

Technical Context

The EV3910-K-00A implements a flyback topology using the MP3910GK controller IC, which employs peak current mode control with cycle-by-cycle current limiting and external soft-start. Its design accommodates both isolated and non-isolated boost configurations, though optimized for 36–72 V telecom input rails.

Key functional blocks include a 1 A 12 V gate driver for high-side N-channel MOSFETs (e.g., Si7450), optocoupler-based secondary-side feedback (PC817B), TL431 shunt regulator reference, and transformer-coupled power stage (Wurth 7491194912). Pulse skipping at light load reduces standby power dissipation without compromising regulation stability.

Key Specifications

Availability

EV3910-K-00A is available at Aetrix Electronics and suitable for telecom isolated power supplies, brick module development, and offline flyback controller prototyping requiring stable component supply and pre-validated reference design fidelity.

Supply support for EV3910-K-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 analog and mixed-signal semiconductor company specializing in high-efficiency power management ICs, including DC-DC converters, LED drivers, and motor drivers.

The MP3910 product line targets high-voltage isolated flyback controllers for telecom and industrial power systems, emphasizing wide input range operation, robust protection, and gate drive strength for discrete MOSFETs.

FAQ

What input voltage range does the EV3910-K-00A support?

The board accepts 36–72 V DC input, specifically engineered for telecom applications where -48 V nominal systems require headroom for ripple, transients, and brown-in/out margins. Operation outside this range may disable regulation or trigger protection circuits.

Can the switching frequency be adjusted on this evaluation board?

Yes - the MP3910GK's frequency is set by an external resistor (R4 = 499 kΩ on this board yields 250 kHz), and can be reconfigured between 30 kHz and 400 kHz. Synchronization input allows locking to external clocks from 80–400 kHz.

Does the EV3910-K-00A provide primary-side or secondary-side regulation?

It uses optocoupler-isolated secondary-side regulation via PC817B and TL431, enabling precise 12 V output with ±1% typical accuracy across line and load variations, independent of transformer turns ratio tolerances.

What protection mechanisms are implemented on the board?

The board implements hiccup-mode overvoltage protection (OVP), overload protection (OLP), and short-circuit protection (SCP) through the MP3910GK's internal comparators and latch logic - faults cause shutdown with automatic restart after thermal recovery.

Is external soft-start supported, and how is it configured?

Yes - the MP3910GK supports external soft-start via a capacitor on the SS pin. On EV3910-K-00A, C11 (1 nF) sets the soft-start time to approximately 10 ms, limiting inrush current during startup without requiring additional circuitry.

Can the EN pin be used for remote on/off control?

Yes - the EN pin accepts TTL-compatible logic: >2 V enables operation, <1 V disables output. This allows integration into system-level power sequencing without modifying the core flyback loop.