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L6919C

Demo Board Description

The L6919C demo board shows the operation of the device in a dual phase application. This evaluation board

allows output voltage adjustability (0.800V - 1.550V) through the switches S0-S4 and high output current capa-

bility.

The board has been laid out with the possibility to use up to two D

to give maximum flexibility in the mosfet choice.

The four layers demo board's copper thickness is of 70

µm in order to minimize conduction losses considering

the high current that the circuit is able to deliver.

Demo board schematic circuit is reported in Figure 18.

Figure 18. Demo Board Schematic

Several jumpers allow setting different configurations for the device: JP3, JP4 and JP5 allow configuring the

remote buffer as desired. Simply shorting JP4 and JP5 the remote buffer is enabled and it senses the output

voltage on-board; to implement a real remote sense, leave these jumpers open and connect the FBG and FBR

connectors on the demo board to the remote load. To avoid using the remote buffer, simply short all the jumpers

JP3, JP4 and JP5. Local sense through the R7 is used for the regulation.

The input can be configured in different ways using the jumpers JP1, JP2 and JP6; these jumpers control also

(See Figure 19).

Figure 19. Power supply configuration

PGOOD

PGND

PGNDS2

ISEN2

LGATE2

VSEN

FB

PHASE2

UGATE2

BOOT2

VCC

COMP

SGND

OSC / INH

VID0

VID1

VID2

VID3

VID4

PGNDS1

ISEN1

LGATE1

PHASE1

UGATE1

BOOT1

VCCDR

6

24

25

26

27

16

15

2

5

4

3

1

13

14

22

21

20

18

19

7

28

23

10

9

8

11

12

FBR

FBG

17

C1

R7

R8

C2

R4

R3

Q3

Q4

C3

L2

C7

R11

D3

C6

C11..C13

C14,

C23

R1

JP3

R2

S1

S0

S3

S2

S4

R5

R6

Q1

L1

Q2

C4

D4

C5

Vin

GNDin

GNDCORE

VoutCORE

PGOOD

FBG

FBR

U1

L6919C

DZ1

C8

JP2

JP1

R13

R15

R12

R14

C9,C10

R9

R18

D1

R17

R16

Q1a

Q3a

D2

R19

R20

JP5

JP4

Vcc

GNDcc

JP6

To pin

VCC

R21

R10

C24

Vin

GNDin

DZ1

JP2

JP1

Vcc

GNDcc

JP6

To Vcc pin

To HS Drains (Power Input)

To BOOTx (HS Driver Supply)

To VCCDR pin (LS Driver Supply)