Monolithic Power Systems Inc. EV4031-S-00A

Overview

EV4031-S-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP4031GS primary-side-controlled offline LED driver IC. It implements a single-stage flyback topology with active power factor correction (PFC), supports both TRIAC and analog dimming, delivers 30V/530mA (16W) output, achieves >82% efficiency and >0.9 power factor across 108–305V_AC, and passes 3kV line-to-line surge testing per IEC61000-4-5.

For engineers reviewing the EV4031-S-00A datasheet, EV4031-S-00A pinout, EV4031-S-00A application, or EV4031-S-00A equivalent, this board provides validated reference design for cost-sensitive, compact 16W TRIAC/analog-dimmable LED bulbs - including full BOM, transformer spec, thermal test data, EMI compliance (EN55015), and dimmer compatibility across 25 commercial leading-edge dimmers.

Technical Context

The EV4031-S-00A implements boundary conduction mode (BCM) control using the MP4031GS SOIC-8 controller, enabling primary-side regulation without optocoupler or secondary feedback. It integrates ZCD sensing via auxiliary winding (R15/R16/C13/D9), cycle-by-cycle current limiting (R18/R20), and multi-level protection including OVP, OCP, OTP, and input UVLO.

Its input stage includes EMI filtering (L1/L2/L3/CX1/CY1/DB1), inrush damping (Q1/Q3/R12), and surge suppression (RV1 + RCD snubber D10/R25/R26/R27/C12). Dimming support is implemented via dedicated circuitry: TRIAC phase detection (R3/R8/R5/R23/C4/D1/D4/Q1/Q3) and analog PWM-to-DC conversion (U2/R36/R37/R38/C17/R30/R19).

Key Specifications

Availability

EV4031-S-00A is available at Aetrix Electronics and suitable for LED lighting development, TRIAC dimmer compatibility validation, and analog-dimmable driver qualification requiring stable component supply, pre-validated safety margins, and production-ready transformer specifications.

Supply support for EV4031-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 focus on energy-efficient power management solutions for computing, automotive, industrial, and lighting applications.

The EV4031-S-00A belongs to MPS's LED driver evaluation board portfolio, designed specifically to accelerate adoption of their primary-side-control (PSR) controllers like MP4031GS in cost-sensitive, compact, and standards-compliant solid-state lighting products.

FAQ

What is the primary function of the EV4031-S-00A evaluation board?

The EV4031-S-00A is a fully assembled, tested reference design board that demonstrates the MP4031GS primary-side-controlled LED driver IC. It validates key performance metrics-including TRIAC/analog dimming, PFC, efficiency, EMI, surge immunity, and thermal behavior-for 16W LED bulb applications. It is not a production-ready module but a design aid for system integration.

Does the EV4031-S-00A include the MP4031GS IC?

Yes. The board integrates the MP4031GS-Z SOIC-8 controller (U1), along with all supporting components: MOSFET Q2 (CEF04N7G), transformer T1 (FX0302), EMI filter, dimming interface circuitry, and protection networks. The BOM lists every component, including manufacturer part numbers and package types.

Can the EV4031-S-00A be used for both TRIAC and analog dimming simultaneously?

No. The board supports either TRIAC dimming (via leading-edge phase-cut AC input) or analog dimming (via 0–10V or PWM signal applied to DIM pin), but not both concurrently. The two modes require different external connections and biasing - detailed in the schematic and quick start guide.

What safety certifications has the EV4031-S-00A passed?

The board itself is not agency-certified, but its design complies with key safety and EMC standards: 3.75kV_AC/1min input-to-output isolation (per IEC61347-1), 3kV line-to-line surge immunity (IEC61000-4-5), EN55015 conducted EMI limits, and IEC61000-3-2 Class C harmonic distortion. Agency approval requires end-product certification.

Is transformer T1 included, and are its specs publicly documented?

Yes. Transformer T1 (FX0302, PQ2020 core) is mounted on the board and fully specified in the documentation: primary inductance 1.74mH ±5%, leakage inductance ≤45μH, turns ratio N_P:N_S:N_AUX = 95:25:20, and triple-insulated secondary winding. Full winding diagram, tape layers, wire gauges, and materials are provided in the datasheet Rev. 1.01.

How does the board handle deep-dimming flicker in TRIAC mode?

The board incorporates MPS's proprietary ripple suppressor circuit (R32/C14/Q5/U3) to reduce LED current ripple during deep dimming. This circuit actively smooths output current by regulating a MOSFET in variable-resistance mode using filtered output voltage - mitigating shimmer caused by inconsistent TRIAC conduction angle per half-cycle.