Fairchild GreenBridge FDMQ8203, GreenBridge FDMS86200, GreenBridge FDMS8025S, GreenBridge FDMC2523P User Manual
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User Guide for
GreenBridge™ Evaluation Kit
for Power Over Ethernet 90 W Active
Clamp Forward DC-DC Converter
MLP 4.5x5 GreenBridge™
Power 33/56 Shielded Gate PowerTrench® MOSFET
Featured Fairchild Products:
FDMQ8203
FDMS86200
FDMS8025S
FDMC2523P
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com
© 2013 Fairchild Semiconductor Corporation FEBFDMQ8203_90W • Rev. 1.0.1
Table of Contents
1. Introduction ............................................................................................................................... 3
1.1. Description ......................................................................................................................3
2. General Evaluation Board Specifications ................................................................................. 4
3. Photographs............................................................................................................................... 5
4. Setup and Test Procedure .......................................................................................................... 6
4.1. Hardware Connector Description ....................................................................................6
5. Performance of Evaluation Board ............................................................................................. 7
6. Printed Circuit Board .............................................................................................................. 10
7. Schematic ................................................................................................................................ 11
8. Bill of Materials ...................................................................................................................... 13
9. Revision History ..................................................................................................................... 15
© 2013 Fairchild Semiconductor Corporation 2 FEBFDMQ8203_90W • Rev. 1.0.1
This user guide supports the evaluation kit for GreenBridge™ and shielded gate
PowerTrench
(PoE). It should be used in conjunction with their datasheets as well as Fairchild’s
application notes and technical support team. Please visit Fairchild’s website at
www.fairchildsemi.com
1. Introduction
This document describes the proposed solution for PoE++ PD that increases the
delivering power up to 90 W. It is designed to rectify a polarity of DC voltage from
Power Source Equipment (PSE) and then active clamp forward DC-DC converter steps
down a nominal input voltage 48 V
switching frequency. To deliver 90 W power through a network cable, the power system
is composed with four-pair architecture, which PSE uses to deliver data and power to the
PD through both the spare pair and data pair in the network cable at the same time.
1.1. Description
GreenBridge™ FDMQ8203 replaces the conventional diode bridge to reduce the power
dissipation caused by the large voltage drop of a diode bridge, resulting in a lower power
class power device. The small package size of MLP4.5x5 reduces PCB area and increases
power density. FDMC86102 100 V shielded gate PowerTrench® MOSFET for the hot
swap switch has the low conduction loss and the ruggedness due to the low R
wide safe operating area (SOA). The FDMS86200 150 V shielded gate PowerTrench
MOSFET reduces switching loss and conduction loss in the primary switch of the active
clamp forward topology because it has low FOM (R
shielded gate PowerTrench MOSFET is optimized for synchronous rectification because
it has the low R
®
MOSFET applying to a Power Device (PD) of Power over Ethernet
.
to output voltage 3.3 V
IN
and outstanding body diode performance.
DS(on)
x Qg). The FDMS8025S 30 V
DS(on)
in 300 kHz of the
OUT
DS(on)
and
Figure 1. Power diagram
© 2013 Fairchild Semiconductor Corporation 3 FEBFDMQ8203_90W • Rev. 1.0.1
Table 1. MOSFET Parameters
Part Number Package Type BV
DSS
R
(V)
[mΩ]
DS(ON)
at 10 V
GS
Qg [nC]
at 10 VGS
C
[pF]
OSS
Max. Max. Max.
FDMQ8203 MLP 4.5x5
FDMC86102 POWER33 N-Ch 100 24 13 175
FDMS86200 POWER56 N-Ch 150 18 33 203
FDMC2523P POWER33 P-Ch -150 1500 9 80
FDMS8025S POWER56 N-Ch 30 2.8 34 815
N-Ch 100 110 5 55
P-Ch -80 190 19 65
2. General Evaluation Board Specifications
Table 2. Summary of Features and Performance
Description Value Remark
Input Voltage Range 42 ~ 57 VIN IEEE802.3 at Standard
Output Voltage Range 3.3 V
Switching Frequency 300 kHz Adjustable by R29 and R30, R31
Maximum Output Current 27 A Limited by Power Component
PCB Size 100x70 mm FR-4 / 4 Layers
PD Controller IEEE802.3 at PD Controller
PWM Controller Active Clamp Forward Controller
42V
>89%
IN
Efficiency
Temperature
48VIN >90%
57VIN >90%
FDMQ8203 58.4°C
FDMC86102 56.4°C
FDMS86200 74°C
FDMC2523P 65°C
FDMS8025S 88.6°C
Adjustable by R22 and R46
OUT
At Full Load (90 W)
At Full Load (25℃ Room Temperature)
© 2013 Fairchild Semiconductor Corporation 4 FEBFDMQ8203_90W • Rev. 1.0.1
3. Photographs
Figure 2. Top Side View of Evaluation Kit
Figure 3. Bottom Side View of Evaluation Kit
© 2013 Fairchild Semiconductor Corporation 5 FEBFDMQ8203_90W • Rev. 1.0.1
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