Features• Features of the PM8805 PoE-PD interface:

– System in package integrating a double active bridge, a hot-swap MOSFETand a PoE-PD

– Supports legacy high power, 4-pair applications– 100 V N-ch MOSFETs with 0.2 Ω total path resistance for each active

bridge– Identifies which kind of PSE (standard or legacy) is connected to, and

provides successful IEEE802.3 af /at /bt classification indication ascombination of the T0, T1 and T2 signals (open drain)

– Smart operational mode selection through the STBY, FAUX and RAUXcontrol signals

– QFN 56 8x8mm package with 43 pins and 6 exposed pads• Features of the PM8804 PWM controller:

– PWM peak current mode controller– Input operating voltage up to 75 V– Internal high voltage start up regulator with 20 mA capability– Programmable fixed frequency up to 1 Mhz– Soft start up with adjustable time– Soft turn off (optionally disabled)– Dual 1 APK, low side complementary gate drivers– GATE2 optionally turned off for reduced consumption– 80% maximum duty cycle with internal slope compensation– QFN 16 3x3mm package with exposed pad

DescriptionThis reference design represents a 12 V, 8 A converter solution ideal for variousapplications including building safety and security or surveillance, with a PoE-PDinterface and a DC-DC active clamp forward converter.

The PoE-PD interface is based on the PM8805 system in package device with twoactive bridges and an IEEE 802.3bt compliant Powered Device (PD) interface. It canbe used in all medium-to-high power 2P and 4P high efficiency PoE and PoE+applications.

The DC-DC active clamp forward converter is designed around the PM8804 PWMcontroller, which is an integrated solution for smart and efficient 48 V converters,featuring a programmable oscillator for the switching frequency, adjustable slopecompensation, dual complementary low-side drivers with programmable dead time,programmable soft start, soft turn off and a programmable current sense blankingtime.

Product summary

High power PoE PD, 12 Vup to 8 A active clampforward evaluation board

STEVAL-POE005V1

PWM peak current modecontroller for PoE andtelecom systems

PM8804

IEEE802.3bt PoE-PDinterface with integrateddual-active bridge

PM8805

12V/8A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design

STEVAL-POE005V1

Data brief

DB3699 - Rev 3 - June 2019For further information contact your local STMicroelectronics sales office.

www.st.com

1 Efficiency

The STEVAL-POE005V1 reference design consists of a PoE interface compliant with the IEEE 802.3bt standardand a forward active clamp DC-DC converter that receives DC voltage from the PoE interface.The figure below shows the efficiency of a single forward converter and the overall efficiency including the PoEinterface power losses.

Figure 1. STEVAL-POE005V1 overall and DC-DC forward efficiency

The dotted lines indicate the STEVAL-POE005V1 efficiency at different DC input voltages applied to RJ45connector J1. The continuous line indicates the DC-DC forward efficiency, which does not include the followinglosses associated with the PoE interface section:• RJ45 connector J1• PoE data transformer T1• common chokes T7 and T8 placed on the two power supply pairs• PM8805 interface that integrates the dual power MOS bridges and a hot swap MOSFET• Forward converter input filter

This efficiency is measured between output test points TP8/TP9 and input test points TP5/TP6 of the forwardconverter.

STEVAL-POE005V1Efficiency

DB3699 - Rev 3 page 2/7

2 STEVAL-POE005V1 schematic diagrams

Figure 2. STEVAL-POE005V1 circuit schematic (1 of 3)

C2

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STEVAL-POE005V1STEVAL-POE005V1 schematic diagrams

DB3699 - Rev 3 page 3/7

Figure 3. STEVAL-POE005V1 circuit schematic (2 of 3)

2

SMC

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STEVAL-POE005V1STEVAL-POE005V1 schematic diagrams

DB3699 - Rev 3 page 4/7

Figure 4. STEVAL-POE005V1 circuit schematic (3 of 3)

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STEVAL-POE005V1STEVAL-POE005V1 schematic diagrams

DB3699 - Rev 3 page 5/7

Revision history

Table 1. Document revision history

Date Version Changes

05-Oct-2018 1 Initial release.

07-May-2019 2Updated document title.

Minor changes to cover page Features and Description.

14-Jun-2019 3 Updated cover page Features and Description.

STEVAL-POE005V1

DB3699 - Rev 3 page 6/7

IMPORTANT NOTICE – PLEASE READ CAREFULLY

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to STproducts and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. STproducts are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design ofPurchasers’ products.

No license, express or implied, to any intellectual property right is granted by ST herein.

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.

ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks. All other product or servicenames are the property of their respective owners.

Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

© 2019 STMicroelectronics – All rights reserved

STEVAL-POE005V1

DB3699 - Rev 3 page 7/7