SMT Power Inductors
Shielded Shaped Core - Spyglass Coupled Inductors
Notes:
5. In high volt*time applications, additional heating in the component can occur due to
1. These high current coupled inductors were designed for (but not limited to) use with the
core losses in the inductor which may necessitate derating the current in order to limit
Pulse planar transformer series for use in high density forward converter applications. The
the temperature rise of the component. In order to determine the approximate total
inductor provides the output filtering on the main winding, and at the same time provides
losses (or temperature rise) for a given application both copper and core losses should
output filtering on the main winding, and at the same time provides an efficient way to
be taken into account.
generate an isolated primary side voltage for powering the converter’s switching regulator
integrated circuit. The above inductors have been tested and approved by Pulse’s IC partners
Total Copper Loss (Pcu_total(W)):
and are cited in the appropriate datasheet or evaluation board documentation at these
Pcu(W)= .001*DCR(mΩ) * (Irms
2
)
companies. To determine which IC and IC partners are matched with the above Pulse part
numbers. please see the IC Cross Reference on the Pulse web page. Other inductance/current where:
Irms = (Idc
2
+ (ΔI/2)
2
)
.5
ratings and turns ratios may be available. Please contact Pulse Power Applications
ΔI
= ripple current through inductor
Engineering for more information.
Core Losses (Pcore(W)):
2. The rated current as listed is either 85% of the saturation current or the heating current
Use the inductor Voltage versus Core Loss table to
depending on which value is lower.
determine the approximate core losses
3. The saturation current is the current which causes the inductance to drop by 15% at the
Total Losses:
stated ambient temperatures (25°C, 100°C).
P total = Pcu total + CoreLoss
4. The heating current is the dc current which causes the temperatre of the part to increase
Temperature Rise:
by approximately 45C. This current is determined by mounting the component on a PCB
The approximate temperature rise can be found by looking up the calculated total
with a .25” wide, 2oz. equivalent copper traces, and applying the current to the device
losses in the Temperature Rise vs. Power Dissipation curve.
for 30 minutes with no force air cooling.
* Contact Pulse for availability
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Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned herein may be
trademarks or registered trademarks of their respective owners. © Copyright, 2015. Pulse Electronics, Inc. All rights reserved.
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