Pulse’s New Power Bead Inductors Meet the Need for Improved Efficiency in Desktop, Notebook and Server Applications
December 19 2008 - 8:00AM
Business Wire
Pulse, a Technitrol (NYSE:TNL) Company, a worldwide leader in
electronic component and subassembly design and manufacturing,
introduces seven new series of power bead inductors, giving
designers the ability to optimize performance across a broad range
of applications, frequencies, and load requirements. Pulse�s highly
efficient, off-the-shelf power beads are the best solution for
multi-phase buck regulator applications. Their low direct current
resistance (DCR) minimizes inductor conduction losses, their
low-loss ferrite cores minimize inductor switching losses, and
their small footprint enables more board layout flexibility. These
new power bead inductors consist of two through-hole (THT) and five
surface-mount (SMT) power bead series. The THT beads are typically
used in power supplies for desktop computing, while SMT versions
are used in notebook computing, servers, graphics cards, and
point-of-load (PoL) applications. The new Pulse power beads have a
tightly controlled DCR for inductor current sense applications.
This is important because in most applications the resistance of
the inductor is used to sense the power supply current. Wide
variations in inductor DCR impair over-current protection schemes
and ultimately lead to a less-efficient design. In the past the
inductor DCR had to be increased due to the inability of the
integrated circuits (ICs) to sense the low voltage drop (I^2*R)
across the inductor. Now that the ICs have improved their off-set
voltage capabilities, these beads can have even lower DCR than
previous versions, further improving efficiency. The new power
beads include the series listed below. Dimensions, given as length
x width x height, are provided as well as links to the data sheet
for each series. PA1682.XXXNL SMT: 7.0 x 8.0 x 4.0mm, 0.5mOhms,
70nH/63Apk to 175nH/26Apk, on data sheet P668
(http://ww2.pulseeng.com/products/datasheets/P668.pdf).
PA2083.XXXNL SMT: 7.6 x 7.4 x 7.0mm, 0.6mOhms, 70nH/90Apk to
205nH/32Apk, on data sheet P659
(http://ww2.pulseeng.com/products/datasheets/P659.pdf).
PA2509.XXXNL SMT: 7.0 x 8.5 x 8.0, 0.35mOhms, 70nH/107Apk to
200nH/36Apk, on data sheet P672
(http://ww2.pulseeng.com/products/datasheets/P672.pdf).
PA2202.XXXNL SMT: 12.1 x 10.0 x 6.0, 0.48mOhms, 120nH/84Apk to
365nH/30Apk, on data sheet P664
(http://ww2.pulseeng.com/products/datasheets/P664.pdf).
PA2607.XXXNL SMT: 10.4 x 7.9 x 7.6, 0.29mOhms, 115nH/94Apk to
300nH/32Apk, on data sheet P673
(http://ww2.pulseeng.com/products/datasheets/P673.pdf).
PA2150.XXXNL Through-hole: 11.8 x 9.0 x 9.2mm, 0.5mOhms,
180nH/74Apk to 470nH/27Apk, on data sheet P656
(http://ww2.pulseeng.com/products/datasheets/P656.pdf).
PA2125.XXXNL Through-hole: 15.9 x 9.0 x 9.2, 0.62mOhms, 250nH/68Apk
to 440nH/42Apk, on data sheet P656
(http://ww2.pulseeng.com/products/datasheets/P656.pdf). �Pulse was
the first company to introduce power bead inductors to the market
around ten years ago, and ever since, we have consistently released
new products to meet market requirements. These latest products are
no exception,� explained John Gallagher, field application engineer
for Pulse. �With the increased focus on energy efficiency, voltage
regulator switching frequencies have been reduced, but this
reduction in frequency means higher peak currents, larger
inductances, or both. These new power beads meet these needs. By
working closely with our customers, Pulse is able to provide power
beads to handle almost any application.� Of special interest are
the two new through-hole parts. These inductors are designed
specifically for VR11 desktop architectures. Testing has shown them
to increase efficiency by up to 9% at light load and over 5% at
full load, helping computer manufacturers meet ENERGY STAR�
requirements. In selecting a power bead, Gallagher recommends
selecting the DCR value first, then matching other electrical
specifications to the requirements of the application. Generally,
the smaller the DCR value the better; however, if the DCR is too
low the voltage will be too low to sense the current. A minimum
voltage drop is needed across the inductor, so there has to be a
minimum DCR. Knowing the DCR, inductance, and peak transient
current, one can use the Pulse overview chart
(http://ww2.pulseeng.com/products/datasheets/P676.pdf) to help
determine the optimal power bead for a particular application. The
application will also determine the size and height constraints and
whether to use SMT or THT parts. All Pulse power beads are RoHS
compliant and can support a peak reflow soldering temperature of
260 degrees Celsius; they meet UL94 V0 standards. SMT inductors
come in tape-and-reel packaging, while the THT inductors are
packaged in trays. Prices start at $0.23 for quantities of 100,000.
Lead-time is four to six weeks. Contact Pulse directly for samples
and volume pricing. Powerbeads_hires.jpg photo available at
http://www.pulseeng.com/index.php?620 About Pulse Pulse, a
Technitrol (NYSE:TNL) Company, is a worldwide leader in electronic
component and subassembly design and manufacturing. Pulse�s wide
array of power and signal products are used in computer networking
as well as in communications, power conversion, defense, aerospace,
automotive, acoustics, medical devices, and consumer electronics.
With state-of-the-art custom designs and catalog products, Pulse is
a complete source for electronic OEMs, contract manufacturers, and
ODMs. Pulse is a participating member of IEEE, ATIS, ETSI, HDMI,
the DSL Forum, CommNexus, and MoCA. Copyright �2008 Pulse
Engineering, Inc. All rights reserved. All brand names and
trademarks are properties of their respective holders. Cautionary
Note: This message contains 'forward looking statements' within the
meaning of the Private Securities Litigation Reform Act of 1995.
Actual results may differ materially. This release should be read
in conjunction with the factors set forth in Technitrol's report on
Form 10-Q for the quarter ended September 26, 2008 in Item 1a under
the caption "Factors that May Affect Our Future Results (Cautionary
Statements for Purposes of the 'Safe Harbor' Provisions of the
Private Securities Litigation Reform Act of 1995)."
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