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Application Note 9908
Modi?cations
Adjusting the Output Voltage
All outputs controlled by the HIP6521 are adjustable by
means of the resistive divider connecting the FB pins to their
respective outputs.
The switching regulator’s output has provisions for droop
implementation, unused in the shipping con?guration. As
R8’s value plays in the feedback compensation, it is
recommended VOUT1 is adjusted by adjusting R13 only.
If adjusting the output voltage of the linear regulators, please
pay attention to the recommended resistor value selection
guidelines described in the datasheet.
Improving Output Voltage Tolerance
The key to improving the output voltage tolerance is
identifying the parameters which affect it, and then taking
steps toward improving them.
High dV/dt spikes present in the output voltage waveform
under highly dynamic load application (high dI/dt) are due to
the ESR and the ESL of the output capacitance. These
spikes coincide with the transient load’s rising and falling
edges, and decreasing their amplitude can be achieved by
using lower ESR/ESL output capacitors (such as surface-
mount tantalum capacitors), and/or the addition of more
ceramic capacitors, which have inherently low ESR/ESL.
The addition of more input-side capacitance and decreasing
the input-side capacitor banks’ ESR can also help in
situations where the input-side ripple is affecting the output
regulation. Such an example is excessive ATX 3.3V ripple
reducing the collector-to-emitter voltage available for Q3
(2.5V output setting), and thus inducing an output droop
component. In such instance, the addition of input-side
capacitance and reduction of the ESR component can
reduce the output excursion.
Conclusion
The HIP6521EVAL1 evaluation board showcases a highly
integrated approach to providing peripheral power control in
Pentium 4 computer systems. Sophisticated internal circuits
facilitate ACPI implementation with minimum effort and a
reduced number of external components.
References
For Intersil documents available on the internet, see web site
www.intersil.com/
[1] HIP6521 Data Sheet, Intersil Corporation, Power
Management Products Division, FN4837, 2000.
(www.intersil.com/).
[2] Advanced Con?guration and Power Interface (ACPI)
Speci?cation, Revision 1.0, December 1996,
Intel/Microsoft/Toshiba.
(http://www.teleport.com/~acpi/).
[3] ATX Speci?cation, Version 2.02, October 1998, Intel
Corporation (http://www.teleport.com/~atx/).
5
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