STEVAL-ISA024V1
20 A step-down DC-DC converter demonstration board with
3.3 V
and 250 kHz switching frequency, based on the L6725
out
Features
■ Input voltage, V
■ Output voltage: 3.3 V
■ Selectable switching frequency: 250 kHz / 500
kHz
■ Over-voltage protection
■ Thermal shutdown
: from 4.5 V to 14 V
IN
Description
This 4-layer PCB demonstration board is
designed as a step-down DC-DC converter to
demonstrate the operation of the L6725 device in
a general-purpose 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 L6725 device can
manage minimum ON times (T
100 ns. This makes possible conversions with
very low duty cycles and very high switching
frequencies. The switching frequency is initially
set at 250 kHz (controller free-running FSW), but
a switching frequency of 500 kHz can also be
selected.
) shorter than
ON
Data Brief
STEVAL-ISA024V1
September 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Board schematic STEVAL-ISA024V1
J1
J2
1 Board schematic
Figure 1. Schematic
C11
C9
R9
D1
C12-C13
C10
OCH
BOOT
VCCD R
R11
HGATE
5
8
11
7
3
EAREF
L1
Q4-6
PHASE
VOUT
6
C5
GOUT
C16-C19
C15
R12
C1
D3
C4
Q1-3
R10
LGATE
PGND
9
10
SS
2
R3
R1
16
VFB
R4
C2
COMP
1
R2
C3
U1
OCL
4
R7
12
VCC
L6725
15
GND
C7
R8
R5
R6
C8
VIN
2/4
GIN
VCC
EXT REF
STEVAL-ISA024V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
02-Sep-2008 1 Initial release.
3/4
STEVAL-ISA024V1
y
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