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© 2012 Fairchild Semiconductor Corporation FEBFDMQ8203_25 • Rev. 1.0.0

User Guide for

FEBFDMQ8203_25 W GreenBridge™ Evaluation Kit

for Power Over Ethernet 25 W Flyback DC-DC

MLP 4.5x5 GreenBridge™

Featured Fairchild Product: FDMQ8203

Direct questions or comments about this evaluation board to:

“Worldwide Direct Support”

Fairchild Semiconductor.com

http://www.fairchildsemi.com/cf/

© 2012 Fairchild Semiconductor Corporation 2 FEBFDMQ8203_25 • Rev. 1.0.0

Table of Contents

1. Introduction ............................................................................................................................... 3

1.1. Description ..................................................................................................................... 3 1.2. Features .......................................................................................................................... 3

2. Evaluation Board Specifications ............................................................................................... 3

3. Photographs............................................................................................................................... 4

4. Printed Circuit Board ................................................................................................................ 5

5. Schematic .................................................................................................................................. 6

6. Bill of Materials ........................................................................................................................ 8

7. Electrical Characteristics ........................................................................................................ 10

8. Setup and Test Procedure ........................................................................................................ 10

8.1. Hardware Connector Description ................................................................................. 10

9. Performance of Evaluation Board ........................................................................................... 11

10. Revision History ..................................................................................................................... 14


The following user guide supports the evaluation kit for the MLP4.5x5 GreenBridge™. It should be used in conjunction with the FDMQ8203 datasheet as well as Fairchild’s application notes and technical support team. Please visit Fairchild’s website at www.fairchildsemi.com.

1. Introduction This board is designed to rectify the positive and negative power source from Power Source Equipment (PSE) and regulate 48 V (42 V ~ 57 V) to provide 5 VOUT, 0-5 A with 250 kHz switching frequency. The board meets the required specification under IEEE802.3af.

1.1. Description This kit contains the MLP 4.5x5 GreenBridge™ MOSFET evaluation board.

1.2. Features GreenBridge™ FDMQ8203 Quad P&N-Channel MOSFET Flyback Primary Switch FDS86242 Single N-Channel MOSFET Flyback Secondary Switch FDMC7692S Single N-Channel MOSFET Controller IEEE802.3at PD with Flyback Controller Output-Voltage Range 5 V, Adjustable by R11 and R10 Switching Frequency 250 kHz, Adjustable by C50 Maximum Output Current 5 A, Limited by Power Component

2. Evaluation Board Specifications Table 1. GreenBridge™ MOSFET Parameters

Part Number Location BVDSS (V)RDS(ON) [mΩ] Qg [nC] COSS [pF]

Max. Typ. Typ.

FDMQ8203 Q1, Q4 100 175 at 6 VGS 1.8 at 5 VGS 47

Q2, Q3 -80 235 at 4.5 VGS 6.8 at 4.5 VGS 49

http://www.fairchildsemi.com/


3. Photographs

Figure 1. Top Side View of Evaluation Kit

Figure 2. Bottom Side View of Evaluation Kit


4. Printed Circuit Board PCB layout (100 mm x 80 mm, 4 Layer).

Figure 3. SST (Component Side) Layer Figure 4. SMT (Mounting Side) Layer

Figure 5. TOP & SMT Layer Figure 6. BOT & SMB Layer

Figure 7. INNER1 (POWER) Layer Figure 8. INNER2 (GND) Layer


5. Schematic

Figure 9. GreenBridge™ Block Schematic

RX

+

J2

1A

TX1

2V

6P

11

22

33

44

55

66

D6

3S

MA

J5

8A

R6

17

5

C7

30

.08

2uF

/10

0V

C6

80.0

1uF

/10

0V

R6

275C

69

0.01u

F/1

00V

T2

ET

H1-2

30L

D

11

22

33

44

55

66

99

1010

1111

1212

1414

1313

P4

8V

R6

37

5R

6475

C7

00.0

1uF

/10

0VC

710.0

1uF

/10

0V

J1

1M

ID+1

1

N4

8V

N4

8V

J1

2M

ID-1

1

P4

8V

TX

-

MID

-

J17

RJ

45

12345678

C6

21

nF

R5

22

0K

C6

31

nF

R5

32

0K

Q41

MM

BT2

222

A

Q42

MM

BT2

907

A

D5

0M

M5

Z1

0VD

51

1N4

148

WS

D5

21N

41

48W

SD

53

MM

5Z

10V

C64

1nF

R5

420

K

C65

1nF

R5

52

0K

Q43

MM

BT22

22A

Q44

MM

BT29

07A

D5

4M

M5Z

10V

D5

51

N41

48

WS

D5

61

N41

48

WS

D5

7M

M5

Z1

0V

Q45

FD

MQ

820

3

1 2 3 4 5 6789

10

11

12

13141516

C6

61

nFR

56

20K

C67

1nF

R5

72

0K

Q46

MM

BT2

222

A

Q47

MM

BT2

907

A

C7

21

nF

/2K

V(1

80

8)

D58

MM

5Z

10

VD

59

1N

414

8W

S

D6

01

N4

14

8WS

D6

1M

M5

Z1

0V

Q4

8F

DM

Q8

203

1 2 3 4 5 6789

10

11

12

13141516

C6

01n

FR

58

20K

C6

11

nF

R5

920

K

Q4

9M

MB

T2

222

A

Q5

0M

MB

T29

07A

D4

6M

M5Z

10V

D4

71

N4

148

WS

D48

1N4

148

WS

D4

9M

M5

Z1

0V

J7RXC

T11

TX

+

J8TXC

T11

R6

02

0K

RX

-M

ID+

J30

sup

porte

r

11

J2

9s

upp

orte

r

11

J28

sup

po

rter

11

J3

1s

up

porte

r

11


Figure 10. PoE Power Device Controller and Flyback DC-DC Block Schematic

0

J15

GN

D 11

R1

20

D3

BA

S21

R2

20K / 201

2C

3922uf/16V

R7

4.7

0

0

L4PE

-68386NL

+22uF/100V

C22

R18

12K

C23

2.2uF

/100V

N48V

P48V

R8

150 / 2012

C35

2.2nF

R4

47 D4

MB

R0540

C48

1.5nF

R13

5.1

C44

3.3nF

R24

20k

U3

LTC4269

-1

SH

DN

1

T2P2

RC

LAS

S3

NC

4

VP

OR

TN5

VP

OR

TN6

NC

7

NC

8

SG

9

Vcc

10

ton11

EN

DLY

12

SY

NC

13

SF

ST

14

OS

C15

FB

16V

CM

P17

UV

LO

18S

EN

SE

-19

SE

NS

E+

20C

CM

P21

RC

MP

22R

GD

LY

23P

G24

NC

25V

NE

G26

VN

EG

27N

C28

PW

RG

D29

PW

RG

D_B

AR

30N

C31

VP

RO

TP32

GND33

C50

33pF

J16A

UX+ 1

1

R12

10k

T1PA

2369NL

1 23 5

6 7 9 10

R2

550K

1%

J20

PW

RG

D

11

J18

AU

X- 11

D62

PD

Z36B

C51

NC

C45

1nF

Q11

BS

S63LT

R15

14K 1%

R16

39K 1%

R19

100k

R20

10k

C46

22uf/16V

R21

30ohm 1%

0.1uFC

49

R22

10k

R14

100k

C47

10uf/35V

PC

P200

HM

HA

2801

C3

64.7nF

/250V, G

A343D

C40

100pF / 2012

R10

3K 1%

R9

0.03 1/2W

0

L2DR

73 R33uH

Q1

FD

S86242

3

4

67

5

821

9

R11

27K 1%

Q2

FD

MC

7692S

3

4

67

5

821

9

Q10

MM

BT2907A

Q9

MM

BT2222A

D6

S1B

R17

750

C37

1uF

D5

MB

R0540

C41

1uF

R5

15

R23

39K

R6

10K

C38

100uF

/6.3V

C42

22uf/25V

R3

100

J13V

PO

RT_P

11

L3DR

73 6R

8uH

J14V

PO

RT_N 1

1

C34

1uF

0

J10O

UTP

UT_G

ND

11

J9O

UTP

UT

11


6. Bill of Materials Table 2. Bill of Materials

Item Qty. Reference Part Name Vendor Comment

1 1 C22 22 µF / 100 V / Aluminum Samyoung

2 1 C23 GRM32ER72A225KA35 Murata 2.2 µF / 100 V / 1210

3 3 C34, C37, C41 1 µF / 1608 Any

4 1 C35 2.2 nF / 1608 Any

5 1 C36 GA343D Murata 4.7 µf / 250 V / 1812

6 1 C38 F930J107MBA Unitel Electric 100 µF / 6.3 V / 3225

7 2 C39, C46 C3225X7RIC226M TDK 22 µF / 16 V / 3216

8 1 C40 100 pF / 2012 Any

9 1 C42 GRM32ER71E226KE15L Murata 22 µF / 25 V / 3216

10 1 C44 3.3 nF / 1608 Any

11 9 C45, C60, C61, C62,

C63, C64, C65, C66, C67 1 nF / 1608 Any

12 1 C47 10 µF / 35 V Samsung

13 1 C48 1.5 nF / 1608 Any

14 1 C49 0.1 µF / 1608 Any

15 1 C50 33 pF / 1608 Any

16 1 C51 NC

17 4 C68, C69, C70, C71 C2012X7R2A103K TDK 0.01 µF / 100 V / 2012

18 1 C72 C4520X7R3D102K TDK 1 nF / 2 KV(1808)

19 1 C73 C0805C823K1RACTU Kemet 0.082 µF / 100 V /2012

20 1 D3 BAS21 Fairchild Semiconductor

21 2 D4,D5 MBR0540 Fairchild Semiconductor

22 1 D6 S1B Fairchild Semiconductor

23 8 D46, D49, D50, D53, D54, D57, D58, D61

MM5Z10V Fairchild Semiconductor 10 V Zener Diode

24 8 D47, D48, D51, D52, D55, D56, D59, D60

1N4148WS Fairchild Semiconductor

25 1 D62 PDZ36B On Semiconductor 36 V Zener Diode

26 1 D63 SMAJ58A Diodes TVS Diode

27 1 J17 RJ45 Any

28 1 J21 ATX12V 6P Any

29 1 L2 DR73 R33 µH Coiltronics 0.33 µH

30 1 L3 DR73 6R8 µH Coiltronics 6.8 µH

31 1 L4 PE-68386NL Pulse

32 1 PCP200 HMHA2801 Fairchild Semiconductor Opto-coupler

33 1 Q1 FDS86242 Fairchild Semiconductor 150 V 55 mΩ

MOSFET

34 1 Q2 FDMC7692S Fairchild Semiconductor 30 V 9.3 mΩ MOSFET

35 5 Q9, Q41, Q43, Q46, Q49 MMBT2222A Fairchild Semiconductor

36 5 Q10, Q42, Q44, Q47, Q50 MMBT2907A Fairchild Semiconductor

37 1 Q11 BSS63LT On Semiconductor

38 2 Q45, Q48 FDMQ8203 Fairchild Semiconductor GreenBridge™ Quad MOSFET

39 1 R1 20 Ω / 1608 Any


Item Qty. Reference Part Name Vendor Comment

40 1 R2 20 kΩ / 2012 Any

41 1 R3 100 Ω / 1608 Any

42 1 R4 47 Ω / 1608 Any

43 1 R5 15 Ω / 1608 Any

44 4 R6, R12, R20, R22 10 kΩ / 1608 Any

45 1 R7 4.7 Ω / 1608 Any

46 1 R8 150 Ω / 2012 Any

47 1 R9 0.03 Ω / 0.5 W HMR Shunt Resistor

48 1 R10 3 kΩ 1% / 1608 Any

49 1 R11 27 kΩ / 1% / 1608 Any

50 1 R13 5.1 Ω / 1608 Any

51 2 R14, R19 100 kΩ / 1608 Any

52 1 R15 14 kΩ / 1% / 1608 Any

53 1 R16 39 kΩ / 1% / 1608 Any

54 1 R17 750 Ω / 1608 Any

55 1 R18 12 kΩ / 1608 Any

56 1 R21 30 Ω / 1% / 1608 Any

57 1 R23 39 kΩ / 1608 Any

58 10 R24, R52, R53, R54, R55, R56, R57, R58, R59, R60

20 kΩ / 1608 Any

59 1 R25 50 kΩ / 1% / 1608 Any

60 4 R61, R62, R63, R64 75 Ω / 1608 Any

59 1 T1 PA2369NL Pulse Transformer

60 1 T2 ETH1-230LD Coilcraft Ethernet Transformer

61 1 U3 LTC4269-1 LTC PoE Flyback IC


7. Electrical Characteristics Table 3. Electrical Specification

Parameter Value Remark

GreenBridge™ FDMQ8203 Quad P&N-Channel MOSFET, Fairchild Semiconductor

Flyback Primary Switch FDS86242 Single N- Channel MOSFET, Fairchild Semiconductor

Flyback Secondary Switch FDMC7692S Single N- Channel MOSFET, Fairchild Semiconductor

Controller IEEE802.3at PD with Flyback Controller

VOUT Range 5 V Adjustable by R11 and R10

Switching Frequency 250 kHz Adjustable by C50

Maximum IOUT 5 A Limited by Power Component

8. Setup and Test Procedure Table 4. Test Point Descriptions

Test Point Label Descriptions

J13 P48V Measurement test point for rectified positive input voltage

J14 N48V Measurement test point for rectified negative input voltage

J15 GND Measurement test point for input voltage return

J9 +VOUT Measurement test point for output voltage

J10 -VOUT Measurement test point for output voltage return

8.1. Hardware Connector Description The evaluation kit is fully assembled and tested. Follow the steps below to verify board operation.

1. Use one of the following methods to power the evaluation kit:

If network connectivity is required: Connect a CAT5 Ethernet network cable from the evaluation kit input port RJ45 connector to the corresponding PSE Ethernet LAN connection, which provides power to the evaluation kit. J21 connector provides an interface with the Ethernet data signals only.

If network connectivity is not required: Connect a -48 V DC power supply between the TXCT and RXCT. Connect a -48 V DC power supply between the MID+ and MID-.

Caution: Do not turn on the power supply until all connections are completed.

2. Activate the PSE power supply or turn on the external DC power supply.

3. Using a voltmeter, verify that the evaluation kit provides +5 V across the +VOUT and –VOUT pins. –VOUT is isolated from the evaluation kit’s input N48 V and GND pins.


9. Performance of Evaluation Board Figure 11 and Figure 15 are measured data.

Figure 11. Efficiency at VOUT=5 V, fSW=250 kHz, Soaking=5 Minutes, TA=25°C

Figure 12. Power Loss at VOUT=5 V, fSW=250 kHz, Soaking=5 Minutes, TA=25°C

78

80

82

84

86

88

90

1 2 3 4 5

Effic

ienc

y(%

)

Load(A)

FDMQ8203 GreenBridge™ vs. S210 Diode Bridge

GreenBirdge™ 42Vin



Diode bridge 42Vin

Diode bridge 48Vin

Diode bridge 57Vin

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1 2 3 4 5

Pow

er lo

ss(W

)

Load(A)

FDMQ8203 GreenBridge™ vs. S210 Diode Bridge

GreenBirdge™ 42VinGreenBirdge™ 48VinGreenBirdge™ 57VinDiode birdge 42VinDiode birdge 48VinDiode birdge 57Vin


S210 Diode Bridge FDMQ8203 GreenBridgeTM

42 VIN

53.7°C 38.7°C

48 VIN

49.9°C 36.9°C

57 VIN

47.1°C 35.7°C

Figure 13. Thermal Performance Comparison at VOUT=5 V, IOUT=5 A, fSW=250 kHz,

Soaking=5 Minutes, TA=25°C


Figure 14. Thermal Performance at VOUT=5 V IOUT=5 A, fSW=250 kHz, Soaking=5 Minutes, TA=25°C

Figure 15. Thermal Performance at VIN=48 V, VOUT=5 V IOUT=5 A, fSW=250 kHz,

Soaking=10 Minutes, TA=25°C

25

30

35

40

45

50

55

1 2 3 4 5

Tem

pera

ture

())

Load(A)

FDMQ8203 GreenBridge™ vs. S210 Diode BridgeGreenBirdge™ 42VinGreenBirdge™ 48VinGreenBirdge™ 57VinDiode birdge 42VinDiode birdge 48VinDiode birdge 57Vin

GreenBridge™

FDMQ8203: 36.4°C

Flyback PrimaryFDS86242: 51.5°C

Flyback Secondary

FDMC7692S: 61°C


10. Revision History Rev. Date Description

0.1.0 April 23, 2012 Initial Release

1.0.0 November 28, 2012 Reformat to template, Proofread and correct content

WARNING AND DISCLAIMER

Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Users’ Guide. Contact an authorized Fairchild representative with any questions.

This board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk. The Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this User’s Guide constitute a sales contract or create any kind of warranty, whether express or implied, as to the applications or products involved. Fairchild warrantees that its products meet Fairchild’s published specifications, but does not guarantee that its products work in any specific application. Fairchild reserves the right to make changes without notice to any products described herein to improve reliability, function, or design. Either the applicable sales contract signed by Fairchild and Buyer or, if no contract exists, Fairchild’s standard Terms and Conditions on the back of Fairchild invoices, govern the terms of sale of the products described herein.

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION.

As used herein:

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user.

2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

ANTI-COUNTERFEITING POLICY

Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fairchild's Anti-Counterfeiting Policy is also stated on our external website, www.fairchildsemi.com, under Sales Support.

Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing counterfeiting of their parts. Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failed applications, and increased cost of production and manufacturing delays. Fairchild is taking strong measures to protect ourselves and our customers from the proliferation of counterfeit parts. Fairchild strongly encourages customers to purchase Fairchild parts either directly from Fairchild or from Authorized Fairchild Distributors who are listed by country on our web page cited above. Products customers buy either from Fairchild directly or from Authorized Fairchild Distributors are genuine parts, have full traceability, meet Fairchild's quality standards for handling and storage and provide access to Fairchild's full range of up-to-date technical and product information. Fairchild and our Authorized Distributors will stand behind all warranties and will appropriately address any warranty issues that may arise. Fairchild will not provide any warranty coverage or other assistance for parts bought from Unauthorized Sources. Fairchild is committed to combat this global problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors.

EXPORT COMPLIANCE STATEMENT

These commodities, technology, or software were exported from the United States in accordance with the Export Administration Regulations for the ultimate destination listed on the commercial invoice. Diversion contrary to U.S. law is prohibited.

U.S. origin products and products made with U.S. origin technology are subject to U.S Re-export laws. In the event of re-export, the user will be responsible to ensure the appropriate U.S. export regulations are followed.

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ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patentcoverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liabilityarising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/orspecifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customerapplication by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are notdesigned, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classificationin a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorizedapplication, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, andexpenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if suchclaim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. Thisliterature is subject to all applicable copyright laws and is not for resale in any manner.

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