Monolithic Power Systems Inc. EVL8030-QJ-00B

Overview

EVL8030-QJ-00B from Monolithic Power Systems is an evaluation board for the MP8030 IC, a fully integrated IEEE 802.3af/at/bt compliant PoE powered device (PD) with primary-side regulated (PSR) flyback controller, 41–57V PoE input range, 12V/6A output, and dual gate drivers (GATE1/GATE2) supporting hot-swap MOSFET and adapter O-ring replacement.

For engineers reviewing the EVL8030-QJ-00B datasheet, EVL8030-QJ-00B pinout, EVL8030-QJ-00B application, or EVL8030-QJ-00B equivalent, this board enables rapid validation of PoE PD interface behavior, PSR flyback efficiency across 41–57V input, automatic classification/MPS signature compliance, and auxiliary adapter supply integration in security camera and WLAN access point designs.

Technical Context

The board implements the MP8030 IC's full IEEE 802.3af/at/bt detection, classification, and maintain-power-signature (MPS) functions using integrated 100V hot-swap MOSFET (Q1) and GATE1 driver. It supports both PoE-only and dual-input (PoE + 48V adapter) operation via GATE2-driven external N-channel MOSFET (Q2).

Its PSR flyback topology uses the MP8030's internal regulation loop with auxiliary winding feedback (VCC), eliminating optocoupler and secondary-side TL431 circuitry. The design achieves >90% peak efficiency at 6A load and includes frequency dithering (via R19), hiccup-mode OLP/SCP/OVP, and thermal shutdown per MP8030 specifications.

Key Specifications

Availability

EVL8030-QJ-00B is available at Aetrix Electronics and suitable for PoE-powered security cameras, WLAN access points, and IoT edge nodes requiring stable component supply, pre-validated IEEE 802.3at/bt compliance, and dual-input (PoE + adapter) flexibility.

Supply support for EVL8030-QJ-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 semiconductor company specializing in high-performance power management ICs, including DC/DC converters, PoE solutions, motor drivers, and LED drivers, with global manufacturing and quality certifications.

The EVL8030-QJ-00B belongs to MPS's PoE evaluation platform family, designed to accelerate development of IEEE 802.3af/at/bt-compliant powered devices for surveillance, enterprise networking, and smart infrastructure applications.

FAQ

What is the primary function of the EVL8030-QJ-00B evaluation board?

The EVL8030-QJ-00B is a functional demonstration platform for the MP8030 PoE PD controller IC. It validates full IEEE 802.3af/at/bt compliance-including detection, classification, maintain-power-signature (MPS), and hot-swap control-as well as primary-side regulated flyback operation delivering 12V/6A from 41–57V PoE input or 48V adapter supply.

Does the board support both PoE and auxiliary adapter input simultaneously?

No-EVL8030-QJ-00B supports automatic source selection but not concurrent operation. When PoE is present and valid, the board powers from the Ethernet port (J1); if PoE is absent or fails, it automatically switches to the 48V adapter input (ADAPOT/ADAPOT_GND terminals), enabled by the MP8030's GATE2-controlled external N-MOSFET (Q2) replacing the traditional diode OR-ing circuit.

What protection features are implemented and verified on this board?

The board demonstrates all MP8030-integrated protections: over-current protection (SCP) with hiccup recovery, over-voltage protection (OVP), over-load protection (OLP), and thermal shutdown. Test waveforms in the reference document confirm SCP entry/recovery, load transient response (0→6A), and startup/shutdown behavior under both PoE and adapter supply conditions.

Which inductor is recommended and validated for use with this board?

The board uses the MPS AL5050 series inductor MPL-AL5050-100 (10 µH, 4.8A rated, 5.5A saturation, 37 mΩ DCR) on L2A/L2B. This part is optimized for the MP8030's PSR flyback operation and is listed in the official BOM. Substitution requires matching saturation current, DCR, and core material to maintain regulation accuracy and efficiency.

Can the output voltage be adjusted, and if so, how?

The board is factory-configured for fixed 12V output using the MP8030's internal feedback divider. Output voltage adjustment is not supported without hardware modification: changing resistor R27 (4.99 Ω) alters the current-sense threshold, but true VOUT reprogramming requires redesigning the FB network and validating loop stability-neither intended nor documented for this evaluation board.

Is frequency dithering enabled by default, and how is it controlled?

Yes-frequency dithering is enabled by default via R19 (6.8 kΩ), which sets the dither amplitude per MP8030 datasheet. To disable dithering, replace R19 with a resistor <1 kΩ; however, doing so may increase EMI emissions. The board's test reports include conducted/radiated emission data measured with dithering active.