Monolithic Power Systems Inc. EVL8009A-V-00A

Overview

EVL8009A-V-00A from Monolithic Power Systems is an evaluation board for the MP8009A IEEE 802.3af/at-compliant PoE PD interface and high-efficiency PSR flyback/forward controller IC. It delivers 12V/2.1A output from 36–57V PoE input or 48V auxiliary adapter, integrates a 100V hot-swap MOSFET, supports dual classification modes, and features 250kHz fixed-frequency operation with frequency dithering for EMI reduction.

For engineers reviewing the EVL8009A-V-00A datasheet, EVL8009A-V-00A pinout, EVL8009A-V-00A application, or EVL8009A-V-00A equivalent, this board enables rapid validation of PoE-powered device power supply design - including detection, classification, inrush limiting, and isolated PSR/SSR flyback or active-clamp forward topologies - under real-world line/load/EMI conditions.

Technical Context

The EVL8009A-V-00A implements the full IEEE 802.3af/at PD interface stack: 2-event classification, 120mA inrush current limit, 840mA operational current limit, and integrated 100V hot-swap FET. It pairs this with the MP8009A's dual-mode controller capable of primary-side regulation (PSR) for flyback and secondary-side regulation (SSR) for active-clamp forward or SSR flyback configurations.

It operates at a fixed 250kHz switching frequency with 32ms soft-start, incorporates hiccup-mode OLP/SCP/OVP protection, thermal shutdown, and supports both Ethernet PSE startup and external 48V adapter input. The board uses the MPL-AL5050-100 inductor and is optimized for efficiency across 36–57V input range, achieving >85% peak efficiency at 2.1A load.

Key Specifications

Availability

EVL8009A-V-00A is available at Aetrix Electronics and suitable for IEEE 802.3af/at PoE PD development, security camera power supply qualification, and WLAN access point reference design requiring stable component supply and documented performance validation.

Supply support for EVL8009A-V-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 power management ICs, with expertise in DC/DC converters, PoE solutions, motor drivers, and LED drivers.

The EVL8009A-V-00A belongs to MPS's PoE evaluation platform family, designed specifically to accelerate development of IEEE 802.3af/at-compliant powered devices - emphasizing integration, efficiency, and compliance-ready validation out-of-box.

FAQ

What is the purpose of the AUX input on the EVL8009A-V-00A?

The AUX input (ADP/ADPGND terminals) provides a 48V auxiliary DC power path that bypasses the PoE interface entirely. When connected, the board automatically selects the adapter over PoE input - enabling standalone testing without a PSE, useful for pre-compliance validation and bench characterization under controlled voltage conditions.

Does the board support both PSR and SSR flyback topologies?

Yes - the underlying MP8009A controller supports PSR flyback (primary-side sensing), SSR flyback (secondary-side sensing), and active-clamp forward topologies. The EVL8009A-V-00A is configured as a PSR flyback by default, but its schematic and layout accommodate SSR implementation via FB pin reconfiguration and external optocoupler placement.

Why is a minimum 30mA load required on VOUT during testing?

PSR regulation requires a minimum output load to maintain stable feedback loop operation and prevent false OVP triggering. Without ≥30mA load, the circuit may exceed 12.5V due to regulation drift - hence R28/R29 (820Ω each) form a 60mA dummy load when no system load is present, as specified in the quick start guide.

How is EMI performance optimized on this evaluation board?

The board enables frequency dithering by default (via R8 configuration) to spread spectral energy and reduce peak emissions. Radiated and conducted EMI test results confirm CISPR 32 Class B compliance at 2.1A load - verified with standard 3m chamber setup and main terminal voltage measurement per specification.

Can the EVL8009A-V-00A be used to evaluate 802.3bt (PoE++) compatibility?

No - the MP8009A and EVL8009A-V-00A are certified only for IEEE 802.3af (Class 0–3) and 802.3at (Class 4) standards. They lack the four-pair detection, multi-event classification, and higher power-handling capability required for 802.3bt (up to 90W), and do not support the associated signature or power negotiation protocols.

What is the role of the T2 LAN transformer on the board?

T2 (Wurth 749020010A) is a 350µH Ethernet magnetics module that isolates and conditions the 10/100BASE-TX signal path. It provides common-mode choke functionality, impedance matching (100Ω differential), and surge protection - essential for safe PoE handshaking and data integrity during PSE detection/classification sequences.

Is the MP8009A IC on this board the same as the MP8009AGV listed in the BOM?

Yes - U1 is the MP8009AGV, a QFN-28 (4mm × 5mm) packaged variant of the MP8009A. The "GV" suffix denotes the green, RoHS-compliant, halogen-free version qualified for industrial temperature range (–40°C to +125°C), and is the production-grade part used on the evaluation board.