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參數(shù)資料
| 型號(hào)： | LM2706TL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Miniature, Variable, Step-Down DC-DC Converter with Bypass for RF Power Amplifiers |
| 中文描述： | 0.75 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PBGA10 |
| 封裝： | MICRO BUMP, 10 PIN |
| 文件頁(yè)數(shù)： | 14/15頁(yè) |
| 文件大?。?/td> | 451K |
| 代理商： | LM2706TL |
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Application Information
(Continued)
and act as antennas. Following this rule reduces radiated
noise. Place the capacitors and inductor within 0.2 in
(5 mm) of the LM2706.
3.
Arrange the components so that the switching current
loops curl in the same direction.
During the first half of
each cycle, current flows from the input filter capacitor,
through the LM2706 and inductor to the output filter ca-
pacitor and back through ground, forming a current loop.
In the second half of each cycle, current is pulled up from
ground, through the LM2706 by the inductor, to the output
filter capacitor and then back through ground, forming a
second current loop. Routing these loops so the current
curls in the same direction prevents magnetic field rever-
sal between the two half-cycles and reduces radiated
noise.
4.
Connect the ground pins of the LM2706, and filter capaci-
tors together using generous component-side copper fill
as a pseudo-ground plane. Then, connect this to the
ground-plane (if one is used) with several vias.
This
reduces ground-plane noise by preventing the switching
currents from circulating through the ground plane. It also
reduces ground bounce at the LM2706 by giving it a
low-impedance ground connection.
5.
Use wide traces between the power components and for
power connections to the DC-DC converter circuit.
This
reduces voltage errors caused by resistive losses across
the traces. Because the FB trace of the LM2706 carries
current from the bypass switch, this trace must also be
wide.
6.
Route noise sensitive traces, such as the voltage feed-
back path, away from noisy traces between the power
components.
The voltage feedback trace must remain
close to the LM2706 circuit and should be routed directly
from FB to V
at the output capacitor and should be
routed opposite to noisy components. This reduces EMI
radiated onto the DC-DC converter’s own voltage feed-
back trace.
L
www.national.com
14
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