SMD-P075 Planar Magnetics

SMD magnetics in our proprietary package P075 (USA PAT. 7,129,809) are designed to be used in high density and high reliability DC-DC converters with up to 30 ADC rated output. Typical applications are telecom, military, and aerospace
systems where high efficiency, low profile and high repeatability are paramount. In addition to the tough electrical specifications these magnetics have small footprints and very low profiles, from 0.300" to 0.500". They can operate without any air flow for cooling and may be attached to a substrate / heatsink with controlled temperature. Because of the unique SMD header/custom core combination, there is a direct thermal contact between bottom of ferrite core and heat dissipating substrate. Header also provides stable and precise co-planarity of terminals on both sides of the package. P075 ransformers can be customized for many power topologies, including soft switching, single or multiple outputs, different switching frequencies, and different input/output voltages. Multi-winding inductors are also available. As an example, a family of transformers for 200W forward converters operating at 250kHz is shown below.
Contact our Application Department for more information and customization.

1. Topology:

Forward with active reset

2. Total Output Power After Rectification:

200W

3. Rated Current from Ns1 output (see Table 1)

7.8A to 30A

4. Rated Current from Ns2 output (see Table 1)

4.5A to 6.8A

5. Switching Frequency:

250 kHz

6. Operating ambient range (full load)

-55°C to + 100°C

7. Minimum Primary Inductance:

100 uH

8. Efficiency at nomical input/200W load

See Table 1

9. Temp. Rise, +85°C heatskin:

See Table 1

10. Duty Cycle at Low Line

See Table 1

11. Maximum Leakage Inductance LI:

200 nH

12. Minimum Isolation Voltage

500VDC

13. Weight, maximum

30 gramm

14. Parasitic Capacitance Np-Ns1, Typical

250 pF