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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,

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.

Related Resources

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

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

which should be at 1.2V.

value of 1.2V; if different output voltages are desired, board

refer to Table 1 on page 2 for R2/R64 resistor values, which

can be used to produce different output voltages.

See how-to

video at

intersil.com/

evid02

FIGURE 1. ISL8225MEVAL2Z BOARD IMAGE

LOAD

(0A~90A)

4.5V TO 20V

V

+

-

NOTE 1

+

-

V

+

-

NOTE:

1. Multiple loads can be paralleled to

reach 90A (i.e. Two 45A loads

paralleled together).

December 3, 2012

AN1789.0