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
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2
3
4
7
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F
7
R
8
4
3
D
N
L
0
9
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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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STEVAL-ISA026V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
10-Dec-2007 1 Initial release.
3/4
STEVAL-ISA026V1
y
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