Application Note 1789
ISL8225MEVAL2Z 6-Phase, 90A 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, dual 15A 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. Need more
output current? Simply parallel up to six ISL8225M modules to
scale up to an 180A solution.
The ISL8225M has a thermally enhanced, compact 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.
The ISL8225MEVAL2Z evaluation board allows for a single
6-phase paralleled output, which delivers high current up to
90A. The input voltage is 4.5V to 20V and the default output
voltage on this board is set at 1.2V. The current level for this
board is 90A with no extra cooling required.
Recommended Equipment
• 0V to 20V power supply with at least 10A source current
capability
• Electronic load capable of sinking current up to 90A
(multiple electronic current loads can be used in parallel to
sink more current)
• Digital multimeters (DMMs)
• 100MHz quad-trace oscilloscope
Quick Start
The inputs are J3 (VIN) and J4 (GND). The outputs are J1 and
J5 (VOUT), J2 and J6 (GND) and J6 (VOUT2). Please refer to
Figure 1. This 90A evaluation board can be easily modified to
30A (one module) or 60A (two modules) operation.
1. Connect a power supply capable of sourcing at least 10A to
the input (VIN J3 & GND J4) of the ISL8225MEVAL2Z
evaluation board, with a voltage between 4.5V to 20V.
Connect an electronic load or the device to be powered to
the output (VOUT (J1, J5) & GND (J2, J6)) 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. Duplicated tab
connections on VOUT (J1, J5) and GND (J2, J6) to carry large
current.
2. Ensure the jumpers for EN2 and EN3 are in the “ON”
position and EN is open. Turn on the power supply. If the
board is working properly, the green LED will illuminate; if
not, the red LED will illuminate (recheck the wire/jumper
connections in this case). Measure the output voltage, V
OUT
,
which should be at 1.2V.
3. The ISL8225MEVAL2Z is manufactured with a V
OUT
default
value of 1.2V; if different output voltages are desired, board
resistors can be exchanged to provide the desired V
OUT
. Please
refer to Table 1 on page 2 for R2/R64 resistor values, which
can be used to produce different output voltages.
Related Resources
See how-to
video at
+
V
IN
-
V
4.5V TO 20V
+
-
LOAD
(0A~90A)
NOTE 1
+
V
-
V
OUT
NOTE:
1. Multiple loads can be paralleled to
reach 90A (i.e. Two 45A loads
paralleled together).
FIGURE 1. ISL8225MEVAL2Z BOARD IMAGE
December 3, 2012
AN1789.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Copyright Intersil Americas Inc. 2012. All Rights Reserved.
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