Power Integrations

5245 Hellyer Avenue, San Jose, CA 95138 USA.

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

Title

Engineering Prototype Report for EP-86 –

6.6 W Multi-Class Powered Device (PD) for

Power over Ethernet (PoE) Using

DPA-Switch

Specification

Input: 33-57 VDC, Output: 3.3 V / 2.0 A

Application

PoE Class 2 PD – Including IEEE802.3af

Compliant Interface Circuit

Author

Power Integrations Applications Department

Document

Number

EPR-86

Date

April 13, 2006

Revision

1.1

Summary and Features

• Meets IEEE802.3af requirements according to University of New Hampshire

Interoperability Consortium (UNH-IOC) test results, for Class 1–3 PoE PDs

• DPA-Switch PWM controller with integrated 220 V power MOSFET switch

• Under-voltage (UV) and overvoltage (OV) shutdown functions

• Auto-recovering, hysteretic thermal shutdown

• Auto-restart function: protects against short-circuit and open loop faults

• No-load regulation achieved by cycle skipping

• Fully integrated soft-start minimizes start-up stress and overshoot

• Lossless MOSFET current sense eliminates external sensing components

• Small footprint 3.1" × 1", low overall height 0.45" (excluding RJ-45 connector)

The products and applications illustrated herein (including circuits external to the products and transformer

construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign

patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at

www.powerint.com

.