ST ISA026V1 User Manual

STEVAL-ISA026V1

Step-down DC-DC converter evaluation board with 3.3 V

and switching frequency of 250 kHz, based on the L6732

Features

■ Input voltage, V

■ Output voltage: 3.3 V

■ Selectable switching frequency: 250 kHz / 500

kHz

■ Overvoltage protection

■ Thermal shut-down

Description

This 4-layer PCB evaluation board implements a
step-down DC-DC converter and demonstrates
the operation of the L6732 device in a general­purpose application. The input voltage can range
from 4.5 V to 14 V with an output voltage of 3.3 V.
The module can deliver an output current in
excess of 20 A. The switching frequency is initially
set at 250 kHz (controller free-running FSW), but
a 500 kHz switching frequency can also be
selected.

: from 4.5 V to 14 V

IN

STEVAL-ISA026V1

/ 20 A

out

Data Brief

December 2007 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

4

Board schematic STEVAL-ISA026V1

3

6

3

9

2

N

T

2

C

R

9

C

913

4

0

E

E

E

D

7

6

C

6

S

4

T

5

R

0

5

B

P

3

2

2

3

4

7

8

F

7

R

8

4

3

D

N

L

0

9

5

6

5

8

2

C15

D

2

H

R

D

R13

1 Board schematic

Figure 1. Schematic

VI

11

C12- C13

R11

HGAT

11

PHAS

1

LGAT

1

PGN

S

VF

R

R

Q4-

R1

D

Q1-

C

R

R1

L1

R1

C16- C1

C1

VOU

GOUT

GI

EXT REF

VC

PGOO

SYNC

VCCD

D1

C1

C

EARE

PGOO

SYNC H

VCCD

1

C

VC C

1

GN

1

BOO

1

U1

L673

OC H

OC

COM

R

C

C

R

R

C

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