Monolithic Power Systems Inc. EV4033-K-00B

Overview

EV4033-K-00B from Monolithic Power Systems is an evaluation board designed to demonstrate the MP4033GK primary-side-controlled, active-PFC, Triac-dimmable LED driver IC in a low-line 108–132VAC/60Hz input configuration. It delivers 24V/350mA (8.4W) to an LED load with >81% efficiency, >0.9 power factor, and <20% THD, featuring adaptive dimmer detection, boundary conduction mode operation, and integrated ripple suppression for flicker-free deep dimming in A19 bulb form factor.

For engineers reviewing the EV4033-K-00B datasheet, EV4033-K-00B pinout, EV4033-K-00B application, or EV4033-K-00B equivalent, this board enables rapid validation of Triac-dimmable, high-PF LED driver designs targeting residential and commercial solid-state lighting with IEC61547 surge immunity and EN55015 conducted EMI compliance.

Technical Context

The EV4033-K-00B implements a single-stage flyback topology with primary-side regulation (PSR), eliminating secondary-side feedback components. It uses the MP4033GK controller IC operating in boundary conduction mode (BCM) to minimize MOSFET and diode switching losses while achieving tight LED current regulation across line and load variations.

Key functional blocks include an adaptive phase-cut dimmer detection circuit, a dedicated ripple suppressor (Q1, R4–R11, C9, D2/D4/D7/D8) reducing output current ripple during deep dimming, and comprehensive protection: cycle-by-cycle current limit, output short-circuit, winding short-circuit, ZCD pin short, over-voltage, and over-temperature.

Key Specifications

Availability

EV4033-K-00B is available at Aetrix Electronics and suitable for residential lighting development, commercial LED retrofit design, and industrial solid-state lighting qualification requiring stable component supply, repeatable test platforms, and pre-validated safety/EMI performance.

Supply support for EV4033-K-00B 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-performance power management ICs, with expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The EV4033-K-00B belongs to MPS's LED Driver Evaluation Board product line, engineered to accelerate time-to-market for Triac-dimmable, high-power-factor LED lighting systems targeting cost-sensitive, space-constrained applications like A19 bulbs and downlights.

FAQ

What input voltage range does the EV4033-K-00B support?

The board is specifically configured for 108–132VAC/60Hz operation, validated per North American low-line utility specifications. It is not rated for universal input (90–265VAC); operation outside this range may compromise regulation, efficiency, or safety compliance.

Does the EV4033-K-00B require external programming or configuration?

No. The board operates out-of-the-box with fixed component values set for 24V/350mA output. Dimmer compatibility, PFC behavior, and protection thresholds are determined by the MP4033GK's internal architecture and the populated passive network-no firmware, jumpers, or trimmers are needed.

Can the EV4033-K-00B drive non-Triac dimmable loads?

Yes-it supports direct PWM dimming via the DIM pin (pin 4 of U1), enabling compatibility with microcontroller-based or 0–10V dimming systems. However, its primary design focus and tested performance are for leading- and trailing-edge Triac dimmers.

What protections are implemented on the EV4033-K-00B?

The board integrates over-voltage protection (OVP) on the auxiliary winding, output short-circuit protection (SCP), winding short-circuit detection, cycle-by-cycle current limiting, ZCD pin short-circuit protection, over-temperature protection (OTP), and input UVLO-verified in test reports with recovery behavior documented.

Is the ripple suppressor circuit mandatory for operation?

No. The ripple suppressor (Q1, R4–R11, C9, D2/D4/D7/D8) is optional and labeled as "blue" in the BOM. It is disabled by default and only required when deep-dimming flicker mitigation is critical; removing it reduces component count but may increase output current ripple below 10% dim level.

What is the physical size and mounting form factor?

The board measures 62mm × 25mm × 23mm (L×W×H) and is designed as a single-sided PCB to fit within standard A19 bulb enclosures. It features through-hole and surface-mount components optimized for mechanical robustness and thermal dissipation in enclosed lighting fixtures.