Monolithic Power Systems Inc. EV4057A-K-00A

Overview

EV4057A-K-00A from Monolithic Power Systems is an evaluation board for the MP4057A smart LED driver IC, implementing a single-stage flyback topology to deliver 21V/370mA to an LED string while simultaneously supplying 3.3V/50mA to a wireless control module (e.g., Zigbee or Bluetooth). It supports universal AC input (198–265VAC/50Hz), achieves >0.85 power factor, and meets <30mW standby power per default configuration.

For engineers reviewing the EV4057A-K-00A datasheet, EV4057A-K-00A pinout, EV4057A-K-00A application, or EV4057A-K-00A equivalent, this board enables rapid validation of PSR-controlled smart LED drivers with integrated MCU power supply, low-audible-noise valley switching, and deep dimming down to 5%.

Technical Context

The EV4057A-K-00A implements a primary-side regulated (PSR) flyback converter using the MP4057AGS controller in MSOP-10 package. It eliminates optocoupler and secondary-side feedback, relying on ZCD (zero-current detection) pin sensing and valley-switching control for efficiency and stability.

It integrates dual-output regulation: constant-current (CC) mode for 21V/370mA LED load and constant-voltage (CV) mode for 3.3V/50mA auxiliary rail. Standby power is configurable to ≤30mW (default) or ≤15mW via component selection (e.g., M1/R7).

Key Specifications

Availability

EV4057A-K-00A is available at Aetrix Electronics and suitable for smart LED lighting development, Zigbee/Bluetooth-enabled luminaire qualification, and DALI-compatible driver prototyping requiring stable component supply and reference design traceability.

Supply support for EV4057A-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 emphasis on efficiency, integration, and reliability in power management solutions.

The EV4057A-K-00A belongs to MPS's Smart LED Driver Evaluation Platform line, designed to accelerate adoption of single-chip, PSR-based AC/DC drivers for IoT-connected lighting systems with minimal external components.

FAQ

What is the primary function of the EV4057A-K-00A?

The EV4057A-K-00A is an evaluation board-not a standalone IC-that demonstrates the MP4057A smart LED driver IC. It delivers regulated 21V/370mA to an LED string and 3.3V/50mA to a wireless control module using a single-stage flyback topology with primary-side regulation, eliminating optocouplers and secondary feedback components.

Can the EV4057A-K-00A operate with input voltages below 198VAC?

No. The board is validated and specified only for 198–265VAC/50Hz input. Operation outside this range is not guaranteed: under-voltage may prevent startup due to UVLO threshold (~190VAC equivalent), and over-voltage beyond 265VAC risks overstressing input-stage components like BD1, RV1, and CX1.

How is dimming implemented on this board?

Dimming is achieved via PWM signal applied to the DIM pin (U1 Pin 7), supporting 5%–100% LED current control. Test data confirms linear dimming response from 1% to 100% duty cycle at 200Hz, 1kHz, and 5kHz frequencies, with no visible flicker or audible noise.

Does the board include safety certifications?

No. The EV4057A-K-00A is an engineering prototype evaluation board without agency certification (e.g., UL, CE, EN61347). As stated in the documentation, all testing must use an isolation transformer for AC input; it is not intended for end-product deployment without full safety compliance validation.

What transformer is used, and is it included?

The board uses the custom-wound RM6 transformer FX0474 (T1), with primary inductance 2.2mH ±8%, 115:23:18:4 turns ratio, and 3kV isolation between windings and core. This transformer is mounted on the board and included with the EV4057A-K-00A unit.

Is the 3.3V auxiliary output isolated from the LED output?

No. Both outputs share the same flyback transformer secondary winding structure: the 21V LED output is derived from the main secondary (N2), while the 3.3V rail is generated via a forward-winding (N5) and linear regulator stage (U1 internal LDO + external C11). They are galvanically coupled but functionally separated by dedicated regulation paths.