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)： 15/64頁(yè)
文件大小： 1056K
代理商： 21103
Processor Power Requirement
5
21103G/0—February 1999
AMD-K6
Processor Power Supply Design
Power Supply Specification
For voltage and current specifications for the following
AMD-K6 processors, refer to:
I
Models 6 and 7 —
AMD-K6
Processor Data Sheet
, order#
20695
Model 8 —
AMD-K6
-2
Processor Data Sheet
, order# 21850
Model 9 —
AMD-K6
-III
Processor Data Sheet
, order# 21918
I
I
AMD’s processors have two pins that indicate the voltage
requirements of the device. VCC2DET#, when asserted low,
indicates that the core voltage is different than the I/O voltage.
The VCC2DET# pin is available on 0.35
μ
m processors (Model
6) that operate at 2.9V or 3.2V. Along with VCC2DET#, the
0.25
μ
m devices (Models 7, 8, and 9)
have an additional pin—
VCC2H/L#. When asserted low, VCC2H/L# indicates a
2.2V/2.4V processor core voltage. On 0.35
μ
m devices, this pin is
a No Connect.
Selecting a Power
Supply Design
Most PC platforms today require DC-to-DC voltage conversion
circuits to supply lower voltages to the processor core and I/O.
Two types of regulators are used—linear and switching.
A linear regulator provides excellent dynamic-load response in
the low-voltage, high-current environment. It also contributes
to simplified design and lower cost. However, the efficiency loss
and heat generated by a linear regulator should be addressed
by board designs. Although most desktop system designs can
tolerate the efficiency loss, care should be taken to ensure the
design can handle the heat. In a high-current model, the power
dissipation from the regulator can be as much as that of the
processor itself. In order for the voltage regulator thermal
solution to meet the case temperature requirement, the linear
regulator requires a larger heatsink. As processor voltages drop
and currents increase, it becomes more difficult to implement a
linear solution. Linear regulator solutions are impractical for
currents above 7 A.
A switching regulator meets the efficiency and size limitations
of mobile board designs and is also an excellent choice for
desktop designs. Switching regulators are found in most
notebook computers that require both low-profile design and
power dissipation reduction. Figure 2 shows linear and
switching regulators. The switching regulator uses a series
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