Power Bead Inductors meet desktop/notebook/server demands.
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Press Release Summary:
Comprised of 2 through-hole (THT) and 5 surface-mount (SMT) series, power bead inductors help optimize performance across various applications, frequencies, and load requirements. DCR values from 0.29-0.5 mOhms (SMT) or 0.5 and 0.62 mOhms (THT) minimize inductor conduction losses, while low-loss ferrite cores minimize inductor switching losses. Peak transient current ranges for SMT series vary from 63-26 A to 94-32 A, while THT series offers 74-27 A and 68-42 A ranges.
Original Press Release:
Pulse's New Power Bead Inductors Meet the Need for Improved Efficiency in Desktop, Notebook and Server Applications
Through-hole and SMT configurations can improve efficiency by more than 5%
SAN DIEGO, Calif. - December 19, 2008 - 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.
o 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)
o 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).
o PA2509.XXXNL SMT: 7.0x 8.5 x 8.0, 0.35mOhms, 70nH/107Apk to 200nH/36Apk, on data sheet P672 (http://ww2.pulseeng.com/products/datasheets/P672.pdf).
o 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).
o 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).
o 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).
o 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.
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.
