Monolithic Power Systems Inc. EVL8009-V-00H

Overview

EVL8009-V-00H from Monolithic Power Systems is an evaluation board demonstrating the MP8009 IC - a fully integrated IEEE 802.3af/at-compliant PoE powered device (PD) interface with primary-side regulation (PSR) flyback/forward controller. It delivers 12V/2.1A output from 36–57V PoE input or 48V auxiliary adapter, featuring detection, classification, hot-swap MOSFET, and comprehensive protection (OLP/SCP/OVP/hiccup mode).

For engineers reviewing the EVL8009-V-00H datasheet, EVL8009-V-00H pinout, EVL8009-V-00H application, or EVL8009-V-00H equivalent, this board enables rapid validation of PoE-PD front-end designs with PSR flyback topology, EMI-optimized frequency dithering, and dual-input (PoE + adapter) operation in security cameras, WLAN access points, and IoT endpoints.

Technical Context

The EVL8009-V-00H implements a complete PoE PD reference design centered on the MP8009GV QFN-28 IC, integrating IEEE 802.3af/at detection (1-event/2-event), classification, 100V hot-swap FET, and inrush/operational current limiting (120mA/840mA). Its power stage uses PSR for flyback and SSR for active-clamp forward topologies.

It supports dual-input sourcing: Ethernet jack (J1) for PoE power delivery and dedicated ADP/ADPGND terminals for 48V auxiliary supply, with automatic source selection. The board includes MPL-AL5050-100 inductor, optimized transformer (T1, EP13), and layout-verified EMI filtering per CISPR 32 Class B radiated/conducted emissions test results.

Key Specifications

Availability

EVL8009-V-00H is available at Aetrix Electronics and suitable for IEEE 802.3af/at-compliant security cameras, wireless LAN access points, and IoT edge devices requiring stable component supply, fast PoE prototyping, and production-ready reference design validation.

Supply support for EVL8009-V-00H 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, with expertise in DC/DC converters, PoE solutions, motor drivers, and LED drivers.

The EVL8009-V-00H belongs to MPS's PoE evaluation platform product line, designed to accelerate development of IEEE 802.3af/at-compliant powered devices by providing a fully tested, EMI-compliant, dual-input reference design with minimal external components.

FAQ

What input sources does the EVL8009-V-00H support?

The board accepts power from two independent sources: an IEEE 802.3af/at-compliant PSE via the Ethernet jack (J1), or a 48V DC auxiliary adapter connected to ADP/ADPGND terminals. It automatically selects the active source, enabling seamless failover during PSE interruption without manual reconfiguration.

How is output regulation achieved without secondary-side feedback?

Regulation uses primary-side sensing (PSR) implemented by the MP8009GV controller. It samples reflected flyback voltage across an auxiliary winding to derive output voltage information, eliminating the need for optocouplers, TL431, or secondary-side shunt regulators - reducing BOM cost and board area.

Does the board support both flyback and forward topologies?

Yes - the MP8009GV IC supports PSR for flyback and secondary-side regulation (SSR) for active-clamp forward topologies. The EVL8009-V-00H is configured as a PSR flyback, but its schematic and component selection (e.g., transformer T1, MOSFET Q1) allow straightforward adaptation to SSR forward by modifying feedback routing and gate drive timing.

What is the minimum load requirement to prevent OVP triggering?

A minimum load of >30mA is required on VOUT to maintain stable regulation in PSR mode. If the target system draws no load, a dummy load (R28 and R29, each 820Ω, 1206 package) must be installed to sink ≥30mA - otherwise, the controller may trigger over-voltage protection due to insufficient energy transfer detection.

Can the board be used for compliance testing?

Yes - the board passed CISPR 32 Class B radiated and conducted emissions tests at full load (48V input, 12V/2.1A output) with measured margins exceeding regulatory limits. Its layout, filtering (C9A–C9E, C16/C17), and frequency-dithering configuration are production-intent, making it suitable for pre-compliance verification.

Is the MP8009GV IC included on the board?

Yes - the EVL8009-V-00H integrates the MP8009GV IC in QFN-28 (4mm × 5mm) package (U1), along with all necessary support components including the MPL-AL5050-100 inductor (L2), EP13 transformer (T1), and Si4848 MOSFET (Q1), forming a complete, functional PoE PD reference design.