ISL6558EVAL1 Intersil, ISL6558EVAL1 Datasheet - Page 10

• Manufacturer Part Number: ISL6558EVAL1
• Description: EVAL BOARD W/LOAD TESTER ISL6
• Manufacturer: Intersil
• Series: Endura™r

Specifications of ISL6558EVAL1

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Power - Output: 150W
• Voltage - Output: 1.5V
• Current - Output: 100A
• Voltage - Input: 5V, 12V
• Regulator Topology: Buck
• Frequency - Switching: 500kHz
• Board Type: Fully Populated
• Utilized Ic / Part: HIP6601, ISL6558
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

current distribution among capacitors at both the input
and output. Refer to [5] for other layout rules.
Experimental Results
The ISL6558EVAL1Z evaluation board is capable of 100A
continuous load current and handling 100A/µs or higher
speed load transients. The evaluation board meets the
design specifications indicated in Table 3.
FIGURE 10. OUPTUT FILTER LAYOUT CONFIGURATION
Transient Regulation
Undervoltage Falling
FIGURE 11. INPUT FILTER LAYOUT CONFIGURATION
Switching Frequency
Undervoltage Rising
1. Tie each-channel inductor as close as practical
2. Tie all upper FETs as close as practical before they
Transient Slew Rate
TABLE 3. ISL6558EVAL1Z PRELIMINARY
Continuous Load
Minimum Airflow
Control Voltage
PARAMETER
before they are connected to the output capacitors.
are connected to the input capacitors.
Input Voltage
Overcurrent
Overvoltage
Threshold
Threshold
Threshold
Efficiency
SPECIFICATIONS
Cin
CONDITION
+25°C with
+25°C with
100A Step
100A/µs
200LFM
200LFM
VCC12
VCC5
10
Co
1.485V
MIN
4.5V
Q1
11V
100A/µs
200 LFM
125kHz
0.92Vo
1.15Vo
Application Note 1029
82.8%
0.9Vo
100A
150A
TYP
12V
5V
1.585V
12.6V
MAX
5.5V
EVALUATION BOARD OPERATION
• Table 4 summarizes the equipment used for the
• Apply the input voltage VCC12 (12V) prior to the
EVALUATION BOARD MODIFICATION TIPS
• For 3-phase operation, remove R1 and place JP3 to
• For 2-phase operation, remove R1 and R13 and place
• SW1 is used to engage or remove the load transient
• Use R15, R16, R17, and R18 to program the load
• Reduce the winding of Toroidal Cores (L2-L5) by one
EFFICIENCY
The efficiency data, as plotted in Figure 12, are taken
with a PAPST-MOTOREN TYP 4600X fan turned on 8”
away from the input end of the evaluation board at room
temperature. The figure shows that the converter with
higher output inductance (650nH) operates at a higher
efficiency than that with 400nH output inductance, by
1.5% at full load. The efficiency improvement is at the
expense of the transient performance, as illustrated later.
BOARDS USED
OSCILLOSCOPE LeCroy LT364L S/N: 01106
MULTIMETERS Fluke 8050A S/N: 2466115 and 3200834
EQUIPMENT
performance evaluation.
control voltage VCC5 (5V). This sequencing results in
initializing the HIP6001B driver before the ISL6558
starts, and retains the soft-start interval. Vice versa,
the ISL6558 could produce maximum duty cycle
PWM drive signal, which results in an output
overvoltage trip due to lack of soft-start.
OFF position.
JP3 and JP2 to OFF position.
generator.
transient speed. The higher values these resistors,
the slower the transient.
turn to obtain 400nH output inductance.
AMPLIFIER
SUPPLIES
CURRENT
POWER
PROBE
LOAD
FAN
TABLE 4. EQUIPMENT LIST
1. Hewlett Packard 6653A S/N: 3621A-03425
2. Agilent 20V/100A S/N: US30390609
1. Chroma 63103 S/N: 631030002967
2. Chroma 63103 S/N: 631030003051
LeCroy AP150 SN: 0242
POPST-MOOREN TYP 4600X (4098547)
ISL6558EVAL1Z Rev. B, #1 and #2
EQUIPMENT DESCRIPTIONS
July 31, 2009
AN1029.3