Demoboard

L6725 - L6725A

22/32

7

Demoboard

7.1

20A board description

L6725 demoboard realizes in a four layer PCB a step-down DC/DC converter and shows the

operation of the device in a general purpose application. The input voltage can range from 4.5V

to 14V and the output voltage is at 3.3V. The module can deliver an output current in excess of

20A. The switching frequency is set at 250kHz (controller free-running FBSWB) but it can be

set to 500kHz acting on the EAREF pin.

Figure 16. Demoboard schematic

GOUT

R2

GIN

L1

Q1-3

Q4-6

D3

5

U1

L6725

VIN

VOUT

8

OCH

C11

R9

C9

9

10

6

7

HGATE

PHASE

LGATE

PGND

3

VCC

12

VCC

2

SS

C4

BOOT

D1

11

VCCDR

C10

1

VFB

COMP

R3

R1

C1

C2

C3

R4

R7

4

EAREF

C7

R8

16

15

GND

OCL

R10

R11

C12-C13

C16-C19

C5

R6

R5

C8

J1

R12

C15

EXT REF

J2