Features• Features for PM8805

– 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) it is connected to and

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

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

– QFN 56 8x8mm package with 43 pins and 6 exposed pads• Features for PM8804

– 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 startup with settable time– Soft turn off (optionally disabled)– Dual 1APK, low side complementary gate drivers– GATE2 can be turned off for reduced consumption– 80% maximum duty cycle with internal slope compensation– QFN 16 3x3mm package with exposed pad

DescriptionThis STEVAL-POE006V1 evaluation board lets you evaluate a PD interfacecompliant with the new IEEE802.3bt standard based on the PM8805 IEEE 802.3btPoE-PD interface and a DC-DC forward active clamp converter based on thePM8804 peak current mode controller.

The PM8805 is a highly integrated device embedding two active bridges and anIEEE802.3bt compliant Powered Device (PD) interface suitable for any medium tohigh power, 2P or 4P, high efficiency PoE or PoE+ application.

The PM8804 PWM controller integrates all the circuitry required to design a smartand efficient 48 V converter.

It features 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. The device is designed for high efficiency conversion across wide load ranges.

Product summary

High power PoE PD, 3 Vup to 20 A active clampforward evaluation board

STEVAL-POE006V1

PWM peak current modecontroller for PoE andtelecom systems

PM8804

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

PM8805

High power PoE PD / 3V3 up to 20 A active clamp forward evaluation board

STEVAL-POE006V1

Data brief

DB3669 - Rev 1 - December 2018For further information contact your local STMicroelectronics sales office.

www.st.com

1 Schematic diagrams

Figure 1. STEVAL-POE006V1 circuit schematic (1 of 3)

STEVAL-POE006V1STEVAL-POE006V1 schematic diagrams

DB3669 - Rev 1 page 2/5

Figure 2. STEVAL-POE006V1 circuit schematic (2 of 3)

SLEEP/WKUP

4

VB

R116

SGND

1nF

2

Q142N7002

R115

R10382K1%

3

BA

S70D51

4

R131

D40

D46

R127470K

PGD

3

R760R

Q132N7002

STBY

100K

0805

4

0R-NM

R770R

NMR105

SOD323

R117

R130

1%

123

D42

3

J10

SOD323

10R126

C84

BAT

46J

0805

D37SOD323 SOD323

R10115K

D39

1kR123

0805

TP-Red

1%6K8-NM

Rau

x +l

ive

PoE

22nF

C82

5

D45

SMC

1

BAT

46J

C81

GND

R132

FAU

X

123

OVP

R751k

R119

VOB

D44

C8520K

SOD323

R12120K

TP4

0

SOT23-5

1nF

STPS4S200S

R129

TS2431-AILT-NM

0805

3

BAT

46J

1% SOT23

CLS1

RAUX_MAN

BAT

46J

SOD323

TP1

4k3

NM

1%

RAUX

R12810K

BAT

46J

STB

Y H

igh

D20

BAT

46J

AUXF

RA

UX

3

TP3

2.2K-NM

TP-Black

R670R-NM

1%

AUX Front

GN

D

J9

0805

FAUX

D43 D47

BAT

46J

P1

U23TS431AILT

R114

TP-Red

R120

1

SMC

U22

C78

U24

R102

OVP

NM

TP-Black

D52BAS70-05

SOT23

R118

SS

AUX Rear

R0805

VDC

100k

SOT-23

STBY

TP2

VOUT

4k7

2P2

R12247K

NM

1%

FAUX_MAN

100

R10427K1%

2

R69100k

SOD323Aut

oCla

ss

2

STPS4S200S

2 41

SOT23

0805 4k7

STB

Y SHDNSOD323

R133

C86NM

100k

D53BAS70-05

1

D41

1nF

SOT-23

VB

AUXR

1

GND

FOD817AS

MODE

D14

C83

0805

Figure 3. STEVAL-POE006V1 circuit schematic (3 of 3)

R611.5k

PGND

10K

D12BAS70

1206

TP-Red

S3

VOU

T Le

d

C440.1uF0603

D7

D8

4

C212200pF1812

C3747uF1210

L9

PBSS5240T-NM

0603

NC

27

Q9

200V

STL110NS3LLH7-NM

R1080R05

D49BAS70

1K-NM

SGND

22R-NM

TP14

D7

8V

IN

C52

Coilcraft XAL5050-562

C542200pF

1812

Q12

TP5

4

BZX84C10-NM

S3

D6

PGND

6P

GD

0805

Auxiliary voltage

Synchronous rectifiers

TP-Black

D1

GSL

100V

Input Filter

0603

1

C391nF

R28150R

U4

S2

TS431AILT

VSNSOD323

SMA

2

2

D5

POE120PL-xxL_-NM

GSH

10

D7

D8

5

C60

50V

0805

4.7K 1%

C4047uF1210

3

S1

FDMC86259P

VSP

LPS4018-105ML

PBSS5240T-NM

PBSS4240T-NM0805 R17

R4691K

S1

S2

2KV

0805

1%

TP-Red

SGND

Ex Pad

NM

CTL

15

TP-Red

BLK

16QFN_3X3X0.75_0.5

7

MMBT3904LT1-NM

SOT23-5

D8

S2

3

C25100nF

4

STL110NS3LLH7

200V

C342200pF1812

D8

D8

NC

GAT211

C472.2uF

25V

1K-NM

G4

0603

100V

820R

BZX84C10-NM

R240R

1VSP

0603

AGND

R2510K

16V8x10.5

R5512k1%

Q2STL110NS3LLH7-NM

0805

T4

R48

SOT23

16V

0603

16V

R15NM

2KV

This circuit goes on the bottom sideunder the equivalent circuit on the top side

C

SOT23

1

TP-Red

10K

Q8

220pF

5N

C1

41

100V

R5415K1%

C30NM

SS

C33

4.7uF1210

SGND

GND

PGND

D5

D2

GAT1

PGND10

R40

100V

Power circuit

G4

TP9

100V

C57

16V

turret

S1

3

SMAJ58A

1206

R273M-NM

3

TP10

2KV

TS2431-AILT-NM

BSC190N15NS3

S1

D6

L2

0R

2

SOD323

R3210R

R53

Q3

0R

NC

2

SGND

SOD323

Fairchild FOD817AS

C2933uF100V

R47

R3610R

100V

powerFLAT 5x6

turret

TP7

R3810R

C35

18122200pF-NM

C261nF0805

R45200K

A

MODE

AGND

EEEFK2A330P

PM8804

U2

VSN

S2

S3

4

5

S3

D6

2KV

2

NM

TP11

PGD

D7

SOD323

SOT23

D7

SS2

C231nF0805

VC

0805

C20NM

1812

C56NM

R165R6

10x10.2

D13BAS16J

10k

SER2011-202L

TP-Black

TP12

0805

Q4

R51

12R

TP-Red

S1

S2

R260R

C962.2uF25V

GSL

D11

C27NM

C75100pF-NM0805

0805

47K

C59

1

Feedback circuitAGND

VSP

2

NC

SOD3231210

C3847uF1210

J4

SOT23

100pF

C55100nF25V

C53 33nF

S1

S2

SGND

D6

D7

A

SOT23BZX84C10-NM

MO

DE

13

MA5509-BL

9

21

S3

STL110NS3LLH7

D5

L4

PBSS4240T-NM

T2

0603

D6

R35

R49

SOT23

0603

6

R43130K

1210

22nF

1

1

D9BAS16J

TP-Red

R440R22

Q7

0603

SGNDD

5

Q10

C28NM R56

C43330uF

TP6

R12410R

D6

G4

0805

25V

0805

Q11

16V

T3

D17

C3647uF1210

R335R6

0805

C511nF0805

C4847nF

1206

1

11

8

U3

16V

D8

100V

12

1

2KV

SOT23

AR34

BAS16J

VDC

Chassis

C31

4.7uF1210

4FSW

12

DT3

C58

PowerFLAT 5x6

PowerFLAT 5x6

SOT23

PowerFLAT 5x6

J6

0805

C32

4.7uF1210

1

2

R31NM

L1

5.6uH

SOT23

D16BAS16J

100nF

22nF

VOUT

2KV

C222200pF-NM1812

D8

R780R

2K

Q5

2010

G4

R50220R1%

8

R41NM

C4247uF1210

R37

50V

U12

R29

1206

C50100nF25V

1mH

6

R125

TP13

3

SGND

G4C24

4.7uF1210

R5220k

21206

GSH

17

0805powerFLAT 5x6

16V

D5

CS

14

PGND

SGND

C

16

5

Q1

D48BAS16J

C49NM1206

SOD323

SOD323

C4147uF1210

D5

D15

S3

C

2

100V

22R-NM

TP8

VSN

G4

2

1

R30NM

L3

0R

R62NM

10

9

SOD323

C76100pF-NM0805

0805C461nF0805

D50BAS70

C951nF

C45100nF25V

STEVAL-POE006V1STEVAL-POE006V1 schematic diagrams

DB3669 - Rev 1 page 3/5

Revision history

Table 1. Document revision history

Date Version Changes

20-Dec-2018 1 Initial release.

STEVAL-POE006V1

DB3669 - Rev 1 page 4/5

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© 2018 STMicroelectronics – All rights reserved

STEVAL-POE006V1

DB3669 - Rev 1 page 5/5