Application Note 1793
ISL8225MEVAL4Z Dual 15A/Optional 30A Cascadable
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
Recommended Equipment
• 0V to 20V power supply with at least 5A source current
capability
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, dual 15A design
ready for use are the ISL8225M, a few passive components,
and VOUT setting resistors.
• Electronic load capable of sinking current up to 30A
• Digital multimeters (DMMs)
• 100MHz quad-trace oscilloscope
The simplicity of the ISL8225M is its off-the-shelf, unassisted
implementation. Patented current sharing in multi-phase
operation greatly reduces ripple currents, BOM costs, and
complexity. The ISL8225M has a thermally enhanced, compact
17mm x17mm x 7.5mm QFN package that operates at full load
and over-temperature without requiring forced-air cooling. Easy
access to all pins, with few external components, reduces PCB
design to a component layer and a simple ground layer.
Quick Start
For dual output operation, the inputs are BA7 (VIN1), BA8
(GND), BA3 (VIN2) and BA4 (GND). The outputs are BA5
(VOUT1), BA6 (GND), BA1 (VOUT2) and BA2 (GND).
For paralleled single output operation, the inputs are BA7
(VIN1) and BA8 (GND). The outputs are BA5 (VOUT1) and BA6
(GND) with BA5 and BA1 shorted.
This ISL8225MEVAL4Z evaluation board is designed for dual
15A output applications. Optionally, this board can easily be
converted for 30A single output use. Multiple
ISL8225MEVAL4Z boards can be cascadable through the
SYNC and CLKOUT pins to operate with phase shifting, for
paralleling or multiple output use. The input voltage of this
board is 4.5V to 20V and the default outputs on this board are
set at 1.2V and 1.5V.
Dual Output Mode
1. Connect a power supply capable of sourcing at least 5A to
the inputs BA7 (VIN1), BA8 (GND), BA3 (VIN2) and BA4
(GND) of the ISL8225MEVAL4Z evaluation board, with a
voltage between 4.5V to 20V. VIN1 and VIN2 can be
different with R18 and R19 open.
2. Connect an electronic load or the device to be powered to
the outputs BA5 (VOUT1) and BA6 (GND), BA1 (VOUT2) and
BA2 (GND) of the board. All connections, especially the low
voltage, high current VOUT lines, should be able to carry the
desired load current and should be made as short as
possible.
Related Resources
See how-to
video at
intersil.com/
evid03
-
LOAD2
(0A~15A)
V
V
OUT2
+
4.5V TO 20V
+
LOAD1
(0A~15A)
V
V
OUT1
-
-
V
IN
V
+
FIGURE 1. ISL8225MEVAL4Z BOARD IMAGE
December 6, 2012
AN1793.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Copyright Intersil Americas Inc. 2012. All Rights Reserved.
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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