STEVAL-TSP004V2
PoE 5 V - 4 A PD converter based on the PM8803 IEEE802.3at
compliant synchronous flyback controller
Data brief
Description
The STEVAL-TSP004V2 is a reference design
for a PoE+, high-efficiency, 5 V - 4 A flyback
converter based on the PM8803 PoE controller.
The PM8803 is a highly integrated device
embedding an IEEE802.3at-compliant powered
device (PD) interface together with a PWM
controller and support for auxiliary sources.
The STEVAL-TSP004V2 reference design is
based on an isolated flyback topology CCM
converter featuring synchronous rectification with
gate driver transformer.
Features
IEEE 802.3at compliant PD interface
Works with power supplied from Ethernet
LAN cables or from local auxiliary sources
Line Input voltage range: 40 V
DC
to 60 V
DC
Output voltage: 5 V
DC
± 5%
Output current: 4 A
Peak-to-peak output ripple: < 30 mV
Efficiency DC-DC full-load: > 92%
Overall peak efficiency: > 89%
Transient response ΔV
OUTPK-PK
to 50% load
step: < 170 mV
ΔV in load line case: < 0.5%
RoHs compliant
April 2015
DocID027712 Rev 1
1/7
www.st.com
For further information contact your local STMicroelectronics sales
office
Detailed
description
STEVAL-TSP004V2
2
Detailed description
The PM8803 evaluation board, STEVAL-TSP004V2, has been designed to cover a broad
range of Power over Ethernet (PoE) applications. The PM8803 is a highly integrated device
embedding an IEEE802.3af/at-compliant powered device (PD) interface together with a
PWM controller and support for auxiliary sources. Although the PM8803 can be configured
to work in several isolated topologies (self-driven or transformer gate-driven), the focus
here is on a high-efficiency isolated flyback converter topology with synchronous
rectification, 5 V output voltage with 4 A output current capability.
Auxiliary sources can be connected to the board on 2 different input connectors. One input
(AUX II) allows prevalence of the auxiliary sources with respect to the PoE, while the other
input (AUX I) allows the use of a wall adapter with voltage lower than the internal PoE
UVLO threshold, while still benefitting from the inherent inrush and DC current limit. The
possible configurations supported by the PM8803 evaluation board as options on the same
PCB are:
Input diode bridges; 4 possible options, including active bridges
Optional 4-pair detection circuit, to detect a high power PSE source
Optional booster circuit, to increase the max input current over 800 mA
Diode or synchronous rectification; 4 package options for diode and 3 package options
for MOSFET
Primary side snubber; 3 options including active clamp
Power transformer; 3 size options for transformer gate-driven solutions and 2 size
options for self-driven applications
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DocID027712 Rev 1
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