Monolithic Power Systems Inc. EV4068-N-00A

Overview

EV4068-N-00A from Monolithic Power Systems is an evaluation board for the MP4068GN TRIAC-dimmable LED driver IC, configured in a single-stage Buck topology to deliver 50V/160mA (8W) constant current output from 108–132VAC/60Hz input. It integrates a 500V MOSFET, supports surge immunity per IEC61547, meets IEC61000-3-2 Class C harmonics, and fits inside GU10 bulb enclosures.

For engineers reviewing the EV4068-N-00A datasheet, EV4068-N-00A pinout, EV4068-N-00A application, or EV4068-N-00A equivalent, this board enables rapid validation of low-cost, high-PF dimmable LED driver designs targeting residential and commercial retrofit bulbs with TRIAC compatibility across 30+ dimmer models.

Technical Context

The EV4068-N-00A implements a non-isolated Buck converter using the MP4068GN controller, which features proprietary hybrid operation mode to maintain stable LED current across deep dimming ranges. Input rectification uses MB6S bridge; EMI filtering combines C2/C3/L1; and power delivery to the IC leverages both internal HV regulator and auxiliary path via DSF1J diode during low-conduction-angle conditions.

Output regulation relies on R3/R8 current-sense resistors (1.1Ω + 6.8Ω) feeding back to the IC's CS pin; OVP is set by R1/R2 divider (18kΩ/499kΩ); and thermal protection triggers at ~150°C with auto-restart hysteresis. The board passes 3750VAC input-to-output dielectric strength and 500V line-to-line surge per IEC61547.

Key Specifications

Availability

EV4068-N-00A is available at Aetrix Electronics and suitable for residential LED bulb development, commercial downlight prototyping, and industrial retrofit lamp qualification requiring stable component supply and fast-turn evaluation support.

Supply support for EV4068-N-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP4068 product line targets cost-sensitive, TRIAC-dimmable LED lighting applications operating directly from 120VAC mains, emphasizing minimal external components, high power factor, and seamless dimmer interoperability.

FAQ

What is the maximum LED string voltage the EV4068-N-00A can drive?

The board delivers 50V nominal output with ±2V regulation window under full load, supporting up to 16 standard white LEDs (3.125V each) in series. Output voltage drops linearly below 50V when dimmed, but absolute maximum sustained output is 52V as verified in thermal testing at 132VAC input.

Does the EV4068-N-00A require an external MOV for surge protection?

No. The integrated 500V MOSFET in the MP4068GN allows the board to pass 500V line-to-line surge per IEC61547 without external MOV or TVS devices. RV1 (TVR07241) is included as a redundant clamping element but is not required for basic compliance.

Can the EV4068-N-00A operate with 50Hz input?

Yes. While optimized and tested at 60Hz, the MP4068GN's control loop and dimming detection circuitry support 50Hz operation. Efficiency remains above 85%, PF stays >0.86, and dimmer compatibility is preserved across tested Lutron and Leviton units at 230VAC/50Hz in derivative designs.

What is the purpose of R6 (51kΩ) on the board?

R6 serves as a dummy load to dissipate residual output energy during open-circuit or no-load conditions, preventing overvoltage at the LED terminals and ensuring stable operation of the MP4068GN's protection circuits when no LED string is connected.

How is thermal performance validated on this board?

Thermal testing measured chip junction temperature at 66.9°C and bleeder resistor R5 at 59.9°C under 120VAC/60Hz full load, with dimmer at 50% leading-edge phase-cut. No thermal shutdown occurred, confirming safe operation within MP4068GN's 150°C limit and enabling GU10 enclosure integration.

Is isolation provided between AC input and LED output?

No. The EV4068-N-00A implements a non-isolated Buck topology, meaning the LED output shares a common reference with the AC input neutral. Safety compliance relies on reinforced insulation, 3750VAC dielectric strength test, and proper mechanical enclosure - not galvanic isolation.