Monolithic Power Systems Inc. EV4056-K-00A

Overview

EV4056-K-00A from Monolithic Power Systems is an evaluation board for the MP4056GK LED controller IC, implementing a non-isolated buck-boost topology with active PFC and TRIAC dimming capability. It delivers 48V/340mA (16.32W) to LED loads from 198–265VAC/50Hz input, achieves >88% efficiency, >0.86 power factor, and <37% THD, and supports both leading- and trailing-edge dimmers across 26 verified models.

For engineers reviewing the EV4056-K-00A datasheet, EV4056-K-00A pinout, EV4056-K-00A application, or EV4056-K-00A equivalent, this board serves as a validated reference design for cost-sensitive, high-line-voltage, dimmable LED driver development - especially where IEC61547 surge immunity, EN55015 conducted EMI compliance, and boundary-conduction-mode operation are required.

Technical Context

The EV4056-K-00A implements a single-stage buck-boost converter using the MP4056GK controller in boundary conduction mode (BCM), enabling low MOSFET/diode switching losses and adaptive phase-cut dimmer detection. Its ZCD-based zero-current sensing (via R11/R13 divider) enables precise magnetizing current tracking for BCM timing and output over-voltage protection.

It integrates active damping (Q1, C6, R5, DAMP pin) to suppress inrush current at leading-edge dimmer turn-on, uses a passive bleeder network (C5/R2/R6) to maintain TRIAC holding current, and derives VCC from D4/C10 with internal charging control that disables once VCCEN threshold is reached.

Key Specifications

Availability

EV4056-K-00A is available at Aetrix Electronics and suitable for residential LED bulb design, commercial downlight prototyping, and industrial retrofit lamp qualification requiring stable component supply and pre-validated safety/EMI performance.

Supply support for EV4056-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 analog and power semiconductor company specializing in high-efficiency DC/DC converters, LED drivers, motor drivers, and power modules for consumer, industrial, and automotive applications.

The EV4056-K-00A belongs to MPS's LED driver evaluation platform family, designed to accelerate time-to-market for cost-optimized, dimmable, high-power-factor AC/DC LED solutions targeting retrofit and integrated luminaires.

FAQ

What is the primary function of the EV4056-K-00A evaluation board?

The EV4056-K-00A is a fully assembled, tested reference design board demonstrating the MP4056GK controller IC in a non-isolated buck-boost topology. It provides a production-ready implementation for 16W TRIAC-dimmable LED drivers operating directly from high-line AC input, including all protection features, EMI filtering, and dimmer interface circuitry.

Does the EV4056-K-00A require external isolation or safety certification before use?

No - the board itself is an engineering prototype not agency-certified. Per MPS documentation, all testing must be performed with an isolation transformer on the AC input. It is intended for lab evaluation and design validation only; end-product safety certification (UL/EN62368-1) requires full system-level review and testing.

Can the EV4056-K-00A drive different LED string voltages or currents?

Yes - output voltage and current are set by external components: R15/R16 define LED current (340mA nominal), while R11/R13 set OVP threshold. Adjusting these resistors allows reconfiguration for other LED loads, though thermal and EMI performance must be re-verified per change.

Which IC is used on the EV4056-K-00A, and what package does it employ?

The board uses the MP4056GK, a TRIAC-dimmable offline LED controller in MSOP-10 package. Pin functions include ZCD (zero-current detection), DAMP (active damping control), DIM (dimming signal input), COMP (error amplifier output), and GND - all documented in the MP4056 datasheet.

What protections are implemented on the EV4056-K-00A board?

The board implements winding short-circuit protection (via ZCD monitoring), output over-voltage protection (R11/R13 divider), output short-circuit protection (cycle-by-cycle current limit), ZCD pin short protection (D5 clamp), over-temperature protection (NTC input), and input surge suppression (RV1 MOV + F1 fuse).

Is the EV4056-K-00A compatible with both leading- and trailing-edge TRIAC dimmers?

Yes - the MP4056GK's adaptive dimmer type detection and phase-cut-based control enable compatibility with 26 verified dimmers, including MIKA, Busch, Berker, JUNG, GIRA, Siemens, and LUMEO models in both leading- and trailing-edge configurations, with deep dimming down to ≤10% output.