Date: 23rd Dec 08
Efficient power-bead
inductors for computer power supplies
Pulse introduced 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 these power beads are suited 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 specifications of each device are listed below:
1. PA1682 SMT: 7.0 x 8.0 x 4.0mm, 0.5mOhms
2. PA2083 SMT: 7.6 x 7.4 x 7.0mm, 0.6mOhms
3. PA2509 SMT: 7.0x 8.5 x 8.0, 0.35mOhms
4. PA2202 SMT: 12.1 x 10.0 x 6.0, 0.48mOhms
5. PA2607 SMT: 10.4 x 7.9 x 7.6, 0.29mOhms
6. PA2150 Through-hole: 11.8 x 9.0 x 9.2mm, 0.5mOhms
7. PA2125 Through-hole: 15.9 x 9.0 x 9.2, 0.62mOhms
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.
The all can support a peak reflow soldering temperature
of 260 degrees Celsius and meet UL94 V0 standards.
Packaging: SMT inductors come in tape-and-reel packaging.
RoHS compliant: Yes
Availability: Lead-time is four to six weeks
Pricing: Contact Pulse directly for samples and volume pricing.
For more details visit: www.pulseeng.com
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