參數(shù)資料
型號(hào)： 21103
英文描述： AMD-K6 Processor Family Thermal Solutions Application Note AMD-K6 Processor Power Supply Design Application Note
中文描述： 的AMD - K6處理器系列散熱解決方案應(yīng)用指南的AMD - K6處理器電源設(shè)計(jì)應(yīng)用指南
文件頁(yè)數(shù)： 18/64頁(yè)
文件大?。?/td> 1056K
代理商： 21103
8
Processor Power Requirement
AMD-K6
Processor Power Supply Design
21103G/0—February 1999
making it more difficult to cool the processor. Consider the
example of converting 5V to 2.2V at 10A. In this case, the
power dissipated is (5V – 2.2V)
10A = 28W. This heat makes
using linear regulators impractical in many systems with these
larger currents. To make a design that accommodates a wide
range of processors, a switching design is preferable.
Another consideration for linear supplies involves
high-frequency decoupling on the input to the regulator. Noise
from a 5-V supply can pass through a linear regulator to the
processor. Generally, there is no high-frequency decoupling on
the input of a power supply. A switching design seems to be less
susceptible to this type of noise.
Although linear regulators are good solutions at 2.2V and 7.5A,
AMD does not recommend them as a desktop solution because
of their lack of flexibility. Typically, a desktop motherboard
should work with all available processors. A linear regulator
makes such flexibility difficult to achieve while staying within
heat constraints. However, a switching regulator designed for
3.2V at 14A can also accommodate a 2.2V, 7.5A processor.
Switching Regulator
A switching regulator varies the switch duty cycle (ON/OFF
ratio) according to the output feedback. A large output
capacitor (C
O
) is used in the switching design to achieve a
constant average output. The switching regulator delivers
higher efficiency than a linear regulator, but the tradeoffs are
higher ripple voltages (noise) and slower transient current
response time. A series inductor is used to supply current to the
load during the switch OFF time, adding complexity to the
design. In addition, the inductor and the output capacitor
increase the overall cost of the switching regulator design
relative to a linear regulator design.
The power supply design must account for a low current (I
CC2
and I
CC3
) drain when the processor enters the Stop Grant state.
The power supply must ensure the minimal current drain does
not cause any adverse side effects (drift out of regulation,
over-compensation, or shutdown) that could corrupt or damage
the functionality of the processor.
The processor voltage tolerance requirement on both core and
I/O voltage pins can be handled by commonly available linear
and switching regulators. This application note describes
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