Monolithic Power Systems Inc. EV4033-K-00A

Overview

EV4033-K-00A from Monolithic Power Systems is a high-line-voltage, 10W primary-side regulated (PSR) evaluation board for Triac-dimmable LED drivers featuring active power factor correction (PFC), boundary conduction mode (BCM) operation, and integrated ripple suppression. It implements the MP4033GK controller to deliver 24V/420mA output across 198–265VAC/50Hz input, achieving >83% efficiency, PF >0.8, and THD <28%. Designed for A19 bulb form factor, it supports deep dimming with 19 tested commercial dimmers and meets IEC61000-3-2 Class C, EN55015, and IEC61547 surge immunity.

For engineers reviewing the EV4033-K-00A datasheet, EV4033-K-00A pinout, EV4033-K-00A application, or EV4033-K-00A equivalent, this board enables rapid validation of PSR-based dimmable LED driver designs with adaptive phase-cut detection, real current control without secondary feedback, programmable NTC-based current fold-back, and multi-protection architecture including OVP, SCP, OTP, and winding short-circuit protection.

Technical Context

The EV4033-K-00A implements a single-stage flyback topology with primary-side regulation using the MP4033GK IC in boundary conduction mode (BCM), eliminating optocoupler and secondary-side sensing while maintaining ±3% LED current accuracy across line and load variations. Its adaptive dimmer type detection distinguishes leading- and trailing-edge dimmers automatically, enabling compatibility with 19 distinct commercial dimmers and dimming ratios as low as 0.22%.

The board integrates a discrete ripple suppressor circuit (Q3, R16–R21, D8–D12, C12–C13) that reduces output current ripple during deep dimming to eliminate flicker and shimmer, with minimal impact on system efficiency. Input stage includes EMI filtering (L1/L2/L3/L4, CX1/CY1), MOV (RV1), fuse (F1), and active PFC network (R7/R8/C5) referenced to the MULT pin, ensuring compliance with EN55015 conducted emissions and IEC61000-3-2 harmonic limits.

Key Specifications

Availability

EV4033-K-00A is available at Aetrix Electronics and suitable for residential lighting retrofit, industrial LED lamp design, and commercial solid-state lighting development requiring stable component supply, fast prototyping cycles, and regulatory-compliant reference implementations.

Supply support for EV4033-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 semiconductor company specializing in high-performance analog and power ICs, with expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The EV4033-K-00A belongs to MPS's LED Driver Evaluation Board product line, designed to accelerate adoption of their PSR controllers-specifically targeting cost-sensitive, space-constrained, and dimmer-compatible AC/DC LED lighting applications.

FAQ

What is the primary function of the EV4033-K-00A evaluation board?

The EV4033-K-00A is a fully assembled, tested reference design that demonstrates the MP4033GK primary-side regulated LED driver IC in a Triac-dimmable, high-power-factor flyback configuration. It delivers 24V/420mA from 198–265VAC input and incorporates ripple suppression, adaptive dimmer detection, and comprehensive protection features-including OVP, SCP, OTP, and winding short-circuit detection-to validate real-world lighting system performance.

Does the board require secondary-side feedback components?

No. The EV4033-K-00A uses true primary-side regulation (PSR) enabled by the MP4033GK IC, eliminating optocouplers, TL431 references, and secondary-side current-sense resistors. Output current accuracy is maintained via transformer auxiliary winding sampling and ZCD pin zero-crossing detection, achieving ±3% regulation across line and load without secondary feedback circuitry.

How does the ripple suppressor circuit improve dimming performance?

The discrete ripple suppressor (Q3 AM2340NE, R16–R21, D8–D12, C12–C13) actively filters output current ripple during deep phase-cut dimming, preventing visible flicker and shimmer. Test data confirms flicker-free operation down to 0.22% dim level (MIKA EIM-585) while maintaining >83% efficiency-achieving this with minimal added component count and no compromise to thermal or EMI performance.

Which safety and EMC standards has the board been validated against?

The EV4033-K-00A has passed IEC61547 surge immunity (1kV L–PE, 500V L–N), EN55015 conducted EMI (Class B), IEC61000-3-2 Class C harmonic limits, and IEC61347-1/-2-13 dielectric strength testing (3750VAC isolation between primary and secondary). All tests were performed at 230VAC/50Hz with full-load LED string and verified post-stress functionality.

Can this board be used directly in production LED lamps?

No-the EV4033-K-00A is an engineering evaluation board intended for design verification and prototyping only. It lacks agency safety certifications (UL, CE, etc.) and is not qualified for end-product use. However, its schematics, BOM, layout, and test reports serve as a production-ready foundation: MPS provides full design files and application notes to support derivative designs meeting UL 1310, IEC 62384, and other lighting safety standards.

What is the role of the MP4033GK IC on this board?

The MP4033GK is a dedicated primary-side controlled LED driver IC housed in MSOP-10 package. On the EV4033-K-00A, it executes adaptive phase-cut dimmer detection, BCM switching control, real-time LED current regulation via primary sensing, active PFC, and all protection functions-including cycle-by-cycle current limit, over-temperature shutdown, and auxiliary-winding-based OVP-without requiring external microcontrollers or digital interfaces.