Monolithic Power Systems Inc. EV3910A-S-00A

Overview

EV3910A-S-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP3910A peak current mode PWM controller, which drives external MOSFETs for high-current boost conversion (≥10 A), operates from 9–14 V input, delivers 24 V/2 A output, and features 1 A gate drive, 30–400 kHz programmable switching frequency, and pulse-skipping mode for light-load efficiency-used in telecom isolated power and brick module development.

For engineers reviewing the EV3910A-S-00A datasheet, EV3910A-S-00A pinout, EV3910A-S-00A application, or EV3910A-S-00A equivalent, this board enables rapid validation of MP3910A-based boost topologies with SOIC8 controller integration, external MOSFET gate drive timing, cycle-by-cycle current limiting, overvoltage protection, and soft-start configuration under real load conditions (VIN=12 V, VOUT=24 V, IOUT=2 A).

Technical Context

The EV3910A-S-00A implements a non-isolated boost converter using the MP3910A controller IC, which employs peak current mode control with internal oscillator and external frequency programming via resistor. It supports flyback and boost configurations, includes cycle-by-cycle current limit and overvoltage protection circuitry, and uses a 1 A source/sink gate driver optimized for standard-threshold MOSFETs like the SiR462DP.

Board-level design incorporates a 10 μH main inductor (Wurth 744332100), 0.47 μH auxiliary inductor (Wurth 744373240047), SS5P4 Schottky output diode, and 10 μF/50 V ceramic output capacitors. Input voltage range is strictly 9–14 V; output regulation targets 24 V ±5% at up to 2 A continuous load with thermal management via PCB copper area.

Key Specifications

Availability

EV3910A-S-00A is available at Aetrix Electronics and suitable for telecom isolated power supplies, brick module prototyping, and off-line step-up converter development requiring stable component supply, traceable evaluation hardware, and reference design validation support.

Supply support for EV3910A-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP3910A product line targets high-efficiency, high-current boost and flyback controllers for telecom, industrial, and computing power systems-designed to simplify external MOSFET-based converter implementation with integrated protection and programmable timing.

FAQ

What is the primary function of the EV3910A-S-00A evaluation board?

The EV3910A-S-00A is a fully assembled, tested boost converter evaluation board built around the MP3910A PWM controller. Its purpose is to demonstrate and validate the performance of MP3910A-driven external MOSFET topologies-including startup behavior, load regulation, transient response, and protection features-at 24 V/2 A output under 9–14 V input conditions.

Can the EV3910A-S-00A be used for isolated flyback designs?

Yes-the MP3910A controller on this board supports both non-isolated boost and isolated flyback configurations. The board's schematic and BOM include provisions for transformer-based flyback adaptation, though isolation requires replacing the boost inductor with a flyback transformer and adjusting feedback network components per application requirements.

What are the key external components required to operate the board?

No additional components are required for basic operation: apply 9–14 V DC to VIN/GND, connect load to VOUT/GND, and power on. The board integrates all critical passives-including Wurth inductors, Vishay SiR462DP MOSFET, SS5P4 Schottky diode, Murata ceramic capacitors, and precision resistors for frequency setting and current sensing (R9 = 0.025 Ω).

How is switching frequency configured on this board?

Switching frequency is set by resistor R6 (9.76 kΩ) connected to the RT pin of U1 (MP3910A), establishing a nominal 200 kHz operation per MP3910A's oscillator equation. Frequency can be adjusted from 30 kHz to 400 kHz by changing R6's value-lower resistance increases frequency, higher resistance decreases it.

Does the board implement soft-start, and how is it controlled?

Yes-soft-start is implemented externally via capacitor C4 (1.0 μF) connected to the SS pin of MP3910A. This capacitor controls the ramp rate of the internal reference, preventing inrush current during startup. The time constant is determined by internal current source (typically 5 μA) and C4 value, yielding ~200 ms soft-start duration.

What protection features are active and verified on this board?

The board validates MP3910A's built-in protections: cycle-by-cycle current limiting (via R9 sense resistor and CS pin), overvoltage protection (OVP triggered at ~27 V via resistive divider R4/R5), and thermal shutdown (not board-mounted but inherent to MP3910A). All protections engage without external circuitry beyond the provided BOM.