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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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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

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 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.

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.

Related Resources

Recommended Equipment

• 0V to 20V power supply with at least 5A source current

capability

• Electronic load capable of sinking current up to 30A

• Digital multimeters (DMMs)

• 100MHz quad-trace oscilloscope

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.

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

desired load current and should be made as short as

possible.

See how-to

video at

intersil.com/

evid03

FIGURE 1. ISL8225MEVAL4Z BOARD IMAGE

LOAD2

(0A~15A)

4.5V TO 20V

+

-

V

+

-

LOAD1

(0A~15A)

V

+

-

December 6, 2012

AN1793.1