Demoboard

L6725 - L6725A

26/32

7.2

5A board description

L6725 demoboard realizes in a two 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

5A. The switching frequency is set at 250kHz (controller free-running FBSWB) but it can be set

to 500kHz acting on the EAREF pin. Compared to the 20A version, the only difference of this

board, compared to the first one, is the presence of a dual mosfet chip, for the High-side and

Low-side MOSFETS; besides R13 has been inserted between High side MOSFET Gate and

Phase pin; R15 has been inserted between Low side mosfet Gate and Pgnd pin.

Table 9.

Demoboard part list

Reference

Value

Manufacturer

Package

Supplier

R1

1k

Ω

Neohm

SMD 0603

IFARCAD

R2

1k

Ω

Neohm

SMD 0603

IFARCAD

R3

4K7

R4

2k7

Neohm

SMD 0603

IFARCAD

R5

0

Ω

Neohm

SMD 0603

IFARCAD

R6

N.C.

Neohm

SMD 0603

IFARCAD

R7

4K99

Neohm

SMD 0603

IFARCAD

R8

10

Ω

Neohm

SMD 0603

IFARCAD

R9

2K49

Neohm

SMD 0603

IFARCAD

R10

2.2

Ω

Neohm

SMD 0603

IFARCAD

R11

2.2

Ω

Neohm

SMD 0603

IFARCAD

R12

N.C.

Neohm

SMD 0603

IFARCAD

R13

N.C.

Neohm

SMD 0603

IFARCAD

R15

N.C.

Neohm

SMD 0603

IFARCAD

C1

4.7nF

Kemet

SMD 0603

IFARCAD

C2

47nF

Kemet

SMD 0603

IFARCAD

C3

1nF

Kemet

SMD 0603

IFARCAD

C4

100nF

Kemet

SMD 0603

IFARCAD

C5

100nF

Kemet

SMD 0603

IFARCAD

C6

N.C.

/

/

/

C7

100nF

Kemet

SMD 0603

IFARCAD

C8

4.7uF 20V

AVX

SMA6032

IFARCAD

C9

1nF

Kemet

SMD 0603

IFARCAD

C10

1uF

Kemet

SMD 0603

IFARCAD

C11

220nF

Kemet

SMD 0603

IFARCAD

C12-13

3X 10uF

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ST (TDK)