5

Bill of material

Table 6 shows the bill of material for the PoE+ section based on the PM8803 configured in flyback topology with synchronous

rectification using a gatedriver transformer.

With minimal BOM changes it is possible to switch from 3.3 V to 5 V output voltage.

Table 6. EVALPM8803-FWD BOM

3.3 V

5 V

Reference

Description

Value

Tol.

Voltage

Body

Vendor

1

1

EVALPM8803 FLY rev1

Board PCB

88

C1,C2,C3,C4,C11C36,

C44,C45

Ceramic capacitor

100 nF

50 V

603

Std

5

5

C5,C6,C7,C8,C30

Ceramic capacitor

10 nF

10%

100 V

603

TDK

NM

NM

C9,C22

Ceramic capacitor

NM

1812

NM

66

C10,C39,C41,C48C53,

C59

Ceramic capacitor

1 µF

20%

16 V

603

Std

1

1

C12

Ceramic capacitor

2.2 nF

2 kV

1812

TDK

NM

NM

C13,C20

Ceramic capacitor

NM

100 V

603

NM

3

3

C14,C16,C21

Ceramic capacitor

1 nF

10%

100 V

603

TDK

NM

NM

C15,C17,C24,C60

Ceramic capacitor

NM

100 V

805

NM

2

2

C18,C32

Ceramic capacitor

0.1 µF

10%

100 V

805

TDK

2

2

C19,C38

Ceramic capacitor

22 nF

50 V

603

Std

NM

NM

C42,C46,C57,C66C69

Ceramic capacitor

NM

603

NM

1

1

C26

Aluminium capacitor

33 µF

20%

100 V

10x10.2

Std

66

C27,C33,C35,C37C67,

C68

Ceramic capacitor

10 µF

20%

6.3 V

805

Std

2

2

C28,C29

Ceramic capacitor

1 µF

20%

100 V

1206

TDK

1

1

C31

Ceramic capacitor

1 nF

10%

100 V

805

Std

1

1

C34

Aluminium capacitor

330 µF

6.3 V

8x10.5

Suncon