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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Application Note 1790
ISL8225MEVAL3Z 30A, Single Output Evaluation Board
Setup Procedure
The ISL8225M is a complete, dual step-down switching mode
DC/DC module. The dual outputs can easily be paralleled for
single-output, high-current use. It is easy to apply this
high-power, current-sharing DC/DC power module to
power-hungry datacom, telecom, and FPGA applications. All
that is needed in order to have a complete, 30A design ready
for use are the ISL8225M, a few passive components, and
V
OUT
setting resistors.
The ease of use virtually eliminates design and manufacturing
risks while dramatically improving time to market.
The simplicity of the ISL8225M is its off-the-shelf, unassisted
implementation. Patented module structure allows for higher
power density and better efficiency than competing solutions.
Patented current sharing in multi-phase operation greatly
reduces ripple currents, BOM costs, and complexity.
The ISL8225MEVAL3Z evaluation board enables a single
output by paralleling two phases to deliver 30A continuous
load current. The ISL8225M supports input voltage from 4.5V
to 20V and the output voltage ranges from 0.6V to 6V. With the
single resistor modification, the output voltage can be easily
adjusted to different voltages.
Related Resources
Recommended Equipment
• 0V to 20V power supply with at least 10A source current
capability
• Electronic load capable of sinking current up to 30A
• Digital multimeters (DMMs)
• 100MHz quad-trace oscilloscope
Quick Start
The inputs are J1 (VIN) and J2 (GND). The outputs are J3 (VOUT)
and J4 (GND). Refer to Figure 1 for connections.
1. Connect a power supply capable of sourcing at least 10A to
the input (VIN J1 and GND J2) of the ISL8225MEVAL3Z
evaluation board, with a voltage between 4.5V to 20V.
Connect an electronic load or the device to be powered to
the output (VOUT J3 and GND J4) of the board. All
connections, especially the low voltage, high current V
OUT
lines, should be able to carry the desired load current and
should be made as short as possible.
2. Turn on the power supply. Measure the output voltage, V
OUT
,
which should be at 1.2V if the board is working properly.
3. The ISL8225MEVAL3Z is manufactured with a default V
OUT
value of 1.2V; if different output voltages are desired, board
resistors can be exchanged to provide the desired V
OUT
.
Please refer to the table printed on the backside of the
evaluation board or Table 1 on page 2 for R
VSET
resistor values,
which can be used to produce different output voltages.
See how-to
video at
intersil.com/
evid01
FIGURE 1. ISL8225MEVAL3Z BOARD IMAGE
LOAD
(0A~30A)
V
OUT
4.5V TO 20V
V
+
-
V
IN
+
-
V
+
-
December 3, 2012
AN1790.0
