ISL6548A-6506EVAL1Z Intersil, ISL6548A-6506EVAL1Z Datasheet - Page 9

• Manufacturer Part Number: ISL6548A-6506EVAL1Z
• Description: EVALUATION BOARD ISL6548A-6506
• Manufacturer: Intersil

Specifications of ISL6548A-6506EVAL1Z

• Main Purpose: Special Purpose DC/DC, DDR Memory Supply
• Outputs And Type: 7, Non-Isolated
• Power - Output: 178W
• Voltage - Output: 1.8V, 3.3V, 5V, 1.5V, 1.2V, 2.5V, 0.9V
• Current - Output: 15A, 14A, 14A, 10A, 5A, 5A, 2A
• Voltage - Input: 3.3V, 5V, 12V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: ISL6506, ISL6548A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -

Efficiency
Figure 21 shows the efficiencies of the V
V
Measurements were taken at room temperature under
thermal equilibrium with no air flow. As the other regulated
outputs are all derived through linear regulation, their
efficiencies are not shown.
ISL6548A_6506EVAL1Z Customization
There are numerous ways in which a designer might modify
the ISL6548A_6506EVAL1Z evaluation board for differing
requirements. Some of the changes which are possible
include:
• The input and output inductors, L200 and L201, for the
• The input and output capacitance for any of the regulators.
• The overcurrent trip point of the V
• Changing the value of C104 to alter the soft-start profile of
• All MOSFET footprints on the evaluation board allow for
• ISL6506 control can be bypassed by placing zero ohm
• The output voltage of any regulator, except for V
GMCH
V
for the V
programmed through the OCSET resistor, R200. Refer to
the ISL6548A datasheet for details on this.
the V
State.
either SO8 or PowerPak packaged MOSFETs to be
utilized.
jumpers at locations R15 and R18. Doing this will short out
the NFETs that control the 3VDUAL and 5VDUAL rails.
may be modified by changing the voltage programming
NOTE: ALL SIGNALS AT 500mV/DIV UNLESS OTHERWISE STATED
DDQ_DDR
V
V
V
GMCH
TT
DAC
TT_DDR
switching regulators while in the S0 State.
100Ω LOAD ON ALL RAILS
V
5V/DIV
VIDPG
FIGURE 20. FAULT RESPONSE ON VDAC
GMCH
regulator as well as the output inductor, L302,
rail when transitioning from Sleep to Active
regulator.
TIMEBASE: 50ms/DIV
V
DDQ_DDR
9
DDQ_DDR
DDQ_DDR
V
TT_GMCH/CPU
regulator,
Application Note 1285
TT_DDR
and the
• The effect of the S3# and S5# signals on the ATX power
Conclusion
The ISL6548A_6506EVAL1Z is a versatile platform that
allows designers to gain a full understanding of the
functionality of the ISL6506 and ISL6548A chipset in an
ACPI compliant system. The board is also flexible enough to
allow the designer to modify the board for differing
requirements. The following pages provide a schematic, bill
of materials, and layout drawings to support implementation
of this solution.
resistor for the respective regulator. For V
change R204; for V
change R302; V
voltage level is to be modified, always change the resistor
that is tied between the feedback point of the error
amplifier and ground. Modifying the value of the resistor
that is located between the output and the feedback point
on the error amplifier will alter the system response
characteristics. Refer to the ISL6548A datasheet section
titled “References” on page 10 for the equations used to
select the resistor values discussed above.
supply can be negated by populating resistor Rx11 with a
0Ω jumper. Doing this will cause the PSON# signal to the
ATX supply to be hard tied to ground. This will force the
ATX supply on even in sleep states.
75
95
90
85
80
FIGURE 21. SWITCHING REGULATOR EFFICIENCIES
0
3
TT_GMCH/CPU
GMCH
6
LOAD CURRENT (A)
, change R303; for V
9
, change R401. If the
V
GMCH EFFICIENCY
V
DDQ_DDR EFFICIENCY
12
DDQ_DDR
15
January 15, 2007
DAC
,
AN1285.0
,
18