30W SMD Planar Transformers P025

SMD transformers in our proprietary package P025 (USA PAT. 7,129,809) are designed to be used in high density and high reliability DC-DC converters with up to 20 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 transformers have small footprints and very low profiles, such as 0.250". They operate without any air flow for cooling and can 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. The header also provides stable and precise co-planarity of terminals on both sides of the package. P025 transformers 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 forward converters operating at 400kHz is shown below.
Contact our Application Department for more information and customization.

1. Topology:

Forward with active reset

2. Total output power after rectification, maximum:

30 W

3. Rated current from Ns1 output

See Table 1

4. Switching frequency, nominal

400 kHz

5. Operating ambient range (full load):

-55°C to + 100°C

6. Minimum inductance:

Lm = (N)x 1.1 uH/Turns

7. Efficiency at nominal input voltage and 30W load:

See Table 1

8. Maximum Temperature Rise, when bonded to +100°C heatsink:

See Table 1

9. Maximum Duty Cycle

See Table 1

10. Maximum Leakage Inductance Ll :

Ll = (Np) x 6 nH/Turns

11. Minimum Isolation Voltage

1800 VDC

1800 VDC

200 VDC

13. Maximum Weight:

7 gramm

14. Capacitance, typical:

30 pF