Monolithic Power Systems Inc. EV8007-V-00D

Overview

EV8007-V-00D from Monolithic Power Systems is an IEEE 802.3af-compliant PoE Powered Device (PD) evaluation board built around the MP8007 primary-side regulated flyback controller IC. It delivers isolated 5V/2.5A output (13W), integrates a 180V MOSFET, supports 37–57V PoE input and 24V adapter backup, and implements full PD interface functions including detection, classification, inrush control, and 100V hot-swap protection - targeting security cameras and VoIP phones.

For engineers reviewing the EV8007-V-00D datasheet, EV8007-V-00D pinout, EV8007-V-00D application, or EV8007-V-00D equivalent, this board enables rapid validation of primary-side regulation architecture, PoE PD compliance, isolated flyback efficiency across 37–57V input range, and adapter-fallback power path design without optocoupler feedback.

Technical Context

The EV8007-V-00D implements a discontinuous conduction mode (DCM) flyback converter with fixed peak current and variable frequency control to regulate 5V output without secondary-side feedback. Its PD interface fully complies with IEEE 802.3af Class 3 (12.95W), featuring integrated 100V hot-swap MOSFET, programmable 3A current limit, and internal 80V startup circuit.

Board-level design includes Wurth 749020011A Ethernet transformer, Coilcraft CX9628-AL custom flyback transformer (Np:Ns:Na = 20:4:5, Lp = 43.7µH), and dual-input capability supporting both PoE (J1) and 24V DC adapter (VDD/ADPGND). Efficiency reaches up to 87% at 2.5A/5V with 48V input.

Key Specifications

Availability

EV8007-V-00D is available at Aetrix Electronics and suitable for PoE-powered security camera development, VoIP phone prototyping, and WLAN access point power subsystem validation requiring stable component supply, pre-validated reference layout, and documented thermal performance.

Supply support for EV8007-V-00D 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 over two decades of leadership in DC/DC conversion, PoE interface, and motor driver solutions.

The EV8007-V-00D belongs to MPS's PoE evaluation platform product line, designed specifically to accelerate adoption of their primary-side regulated (PSR) flyback controllers like the MP8007 in cost-sensitive, space-constrained isolated power applications.

FAQ

What is the purpose of the ADPGND terminal on the EV8007-V-00D?

ADPGND is the dedicated ground return for the 24V DC adapter input path. When a 24V adapter is connected to VDD and ADPGND, the board prioritizes adapter power over PoE, enabling seamless dual-input redundancy. This terminal must not be shorted to VOGND or RTN to avoid ground loop and regulation instability.

Can the output voltage be adjusted to 3.3V or 12V?

Yes - the output voltage is set by the FB resistor divider (R4, R5, R6 on schematic page 3). Replacing R4 (10kΩ) and R5 (24.9kΩ) with appropriate values recalculates the feedback ratio per MP8007's 1.215V internal reference. Transformer turns ratio and output capacitor ratings must also be verified for new voltages.

Does the board support IEEE 802.3at (PoE+) or 802.3bt?

No - the EV8007-V-00D implements only IEEE 802.3af (Type 1, up to 15.4W at PSE, 12.95W at PD). It lacks the two-event classification and higher-power hot-swap circuitry required for 802.3at/bt. For PoE+ evaluation, MPS recommends the EV8009-V-00D platform with MP8009.

What is the role of D6 (BAT46W) and R10 (1kΩ) in the startup circuit?

D6 and R10 form a charge pump path that allows the MP8007's internal high-voltage LDO to bootstrap VCC from VDD during initial startup. Removing them reduces BOM cost but lowers efficiency by ~0.2% due to increased gate drive losses under light load, as confirmed in the Quick Start Guide.

Is the Ethernet connector (J1/J2) populated with magnetics integrated?

Yes - J1 and J2 are RJ45 connectors with integrated signal-line EMI/RFI filters and 1:1 center-tapped magnetics (Wurth 749020011A), enabling direct connection to standard 802.3af PSE equipment without external transformers or common-mode chokes.

How is load regulation performance verified on this board?

Load regulation is measured per Figure 5 in the reference document: output voltage deviation remains within ±0.8% across 0–2.5A load at constant 48V input and 25°C ambient. Line regulation is ±1.2% over 37–57V input range at full 2.5A load, confirming robust PSR control loop stability.