27/32

L6919C

Part List

R1

10k

SMD 0805

R2, R20,R21

Not Mounted

SMD 0805

R3, R4, R5, R6

2.7k

1%

SMD 0805

R7

1k

1%

SMD 0805

R8

1.8k

SMD 0805

R9

47k

1%

SMD 0805

R10

510

SMD 0805

R11

82

SMD 0805

R12 to R19

0

SMD 0805

C1

Not Mounted

SMD 0805

C2

22n

SMD 0805

C3, C4

100n

SMD 0805

C5, C6, C7, C8

1

µ

Ceramic

SMD 1206

C9, C10

10

µ or 22µ / 16V

TDK Multilayer Ceramic SMD 1206

C11 to C13

1800

µ / 16V

Rubycon MBZ

Radial 10x23

C14 to C18

2200

µ / 6.3V

Rubycon MBZ

Radial 10x20

C24

100n

SMD 0805

L1, L2

0.8

µ

77121 - 4Turns

U1

L6919C

STMicroelectronics

SO28

Q1, Q3

SUB85N03-04P

Vishay

D

Q2, Q4

SUB70N03-09BP

Vishay

D

D1, D2

STPS340U

STMicroelectronics

SMB

D3, D4

1N4148

STMicroelectronics

SOT23

S0,S4

Short

S1,S2,S3

Open

STATIC PERFORMANCES

Figure 23 shows the demo board measured efficiency versus load current in steady state conditions without air-

flow at ambient temperature.

Figure 23. System Efficiency

50

55

60

65

70

75

80

85

90

0

5

10

15

20

25

30

35

40

45

Output Current [A]

c