ISL8225MEVAL4Z Intersil, ISL8225MEVAL4Z Datasheet - Page 2

• Manufacturer Part Number: ISL8225MEVAL4Z
• Description: Power Management IC Development Tools Dual 15A Output Eval Board
• Manufacturer: Intersil
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of ISL8225MEVAL4Z

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: ISL8225M
• Input Voltage: 4.5 V to 20 V
• Output Voltage: 1.2 V, 1.5 V
• Output Current: 30 A
• For Use With: ISL8225M

For 12V V
will need to be adjusted, as shown in Table 1. The resistor R
can be adjusted for the desired frequency. No frequency
adjustments are necessary for V
frequency does not need to be adjusted and the module default
frequency can be used at any allowed V
is set to more than 1.8V, the output current will need to be
derated to allow for safe operation. Please refer to the derating
curves in the
Optional Paralleled Single Output Mode
3. Make sure that the setup is connected correctly. Turn on the
4. If different output voltages are desired, board resistors can be
1. To set up the parallel mode, short JP1 (ENC), JP2 (VMON) and
2. Remove R9 and R13. Change R14 to 0Ω. Change R18 and
3. Connect a power supply capable of sourcing at least 5A to the
4. Connect an electronic load or the device to be powered to the
5. Make sure the setup is connected correctly prior to applying any
TABLE 1. VALUE OF BOTTOM RESISTOR (TOP RESISTOR R1,
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
voltages, V
should be at 1.5V
exchanged to provide the desired V
for R2/R4 resistor values, which can be used to produce
different output voltages.
JP3 (COMP) with a jumper. To set up 180° interleaving phase
between 2 channels, short the MODE pin and GND pin of JP6
with a jumper.
R19 to 0Ω. Short VOUT1 to VOUT2 using short wires or copper
straps. Add C2 for a 470pF capacitor.
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 need to be shorted
together.
outputs BA5 (VOUT1) and BA6 (GND) of the board. All
connections, especially the low voltage, high current V
lines, should be able to carry the desired load current and
should be made as short as possible.
power to the board. Adjust the power supply to 12V and turn on
the input power supply. If the board is working properly, the green
LED will illuminate; if not, the red LED will illuminate (recheck the
V
1.0
1.2
1.5
2.5
3.3
5.0
5.5
(V)
OUT
IN
and V
R3 = 1kΩ) AND FREQUENCY SELECTION FOR DIFFERENT
OUTPUT VOLTAGES
ISL8225M
OUT1
OUT
, which should be at 1.2V and V
more than 1.5V, the switching frequency
R2 /R4
1500
1000
665
316
221
137
121
datasheet.
(Ω)
2
OUT
FREQUENCY
below 1.5V. For 5V V
DEFAULT
DEFAULT
DEFAULT
OUT
(kHz)
OUT
650
800
950
950
. Please refer to Table 1
. If the output voltage
Application Note 1793
OUT2
(V
R
IN
FSET
OPEN
OPEN
OPEN
82.5k
82.5k
249k
124k
, which
= 12V)
IN
OUT
, the
(Ω)
FSET
Optional Cascadable Mode
Cascadable mode is needed when multiple evaluation boards
are used for paralleling or multiple output use. To demo the
parallel features, it is recommended to use ISL8225MEVAL2Z
6-phase evaluation board for an easy and efficient setup (see
AN1789). Otherwise, follow the steps shown below:
Evaluation Board Information
The evaluation board size is 114.3mm x 76.2mm. It is a 4-layer
board, containing 2-ounce copper on the top and bottom layers
and 1-ounce copper on all internal layers. The board can be used
as a dual 15A reference design. Refer to “Layout” on page 6. The
board is made of FR4 material and all components, including the
solder attachment, are lead-free.
Thermal Considerations and Current Derating
For high current applications, board layout is very critical in order
to make the module operate safely and deliver maximum
allowable power. To carry large currents, the board layout needs
to be designed carefully to maximize thermal performance. To
achieve this, select enough trace width, copper weight and the
proper connectors.
This evaluation board is designed for running dual 15A at room
temperature without additional cooling systems needed.
6. Apply any load that is less than 30A for normal steady state
1. In order to generate CLKOUT at a shifted phase clock signal,
2. Program MODE and VSEN2+ pin voltages to set the CLKOUT
3. Use a coaxial cable to connect CLKOUT (J5) to SYNC (J2) of the
4. If the second board is programed for parallel use, the ISHARE
5. If the third board is used in cascadable mode, the second
6. Follow the instructions from Steps 1 through 5 for more
Single
Dual
TABLE 2. BOARD CONFIGURATION FOR SINGLE OUTPUT 30A
wire/jumper connections in this case). Measure the output
voltages, V
operation. Refer to Table 1 to change the output voltage by
changing resistor R2.
the control loop of VOUT2 needs to be disabled by connecting
VSEN2- to VCC.
signal and the shifted degrees between two phases on the
board (refer to Table 3).
next evaluation board, which can be programed for parallel or
dual output use.
pins of the first and second boards need to be tied together.
Using two twisted wires, short two different jumpers of JP7
(ISHARE/SGND) on two evaluation boards. Add 1nF
capacitors of C14 for different boards to decouple the noise.
board can only be used in the parallel mode to generate the
CLKOUT signal for the SYNC pin on the third board.
cascadable boards.
OPEN
ENC
ON
APPLICATION
OUT1
VMON
OPEN
, which should be at 1.2V.
ON
MODE
OPEN
ON
COMP
OPEN
ON
OPEN
R9
0
December 6, 2012
OPEN
R13
0
AN1793.1
OPEN
R14
0