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Planar Transformers combine high efficiency, excellent DCR, very low leakage inductance, and low Z axis height For PoE -48-V power applications.

Power Over Ethernet magnetic design engineers are increasingly faced with higher power needs in power supplies with -48V network power. These needs include higher power PSE requirements, migration from merchant power supplies to on board power supplies, and limited Z axis height for rack mounted systems. Coilcraft’s planar magnetics can help meet those needs.


Coilcraft Planars-300x239

Coilcraft has released two series of surface mount planar transformers for power over Ethernet (PoE) and -48V network power. PL160 is rated for 160Watt 200-700kHz with a nominal 48 V input. The PL300 is rated for 300W with DC resistance as low as 7.2mOhms and leakage inductance can be down to 0.20µH. Each provide 1.5kV primary-to-secondary isolation and 0.229mm clearance above the seating plane. Both are RoHS compliant and feature matte tin over nickel over brass terminations. Both series can also be special ordered with an optional auxiliary winding.

Coilcraft’s Planar Transformer Prototyping Kit

Coilcraft Planar Designers Kit

This is the kit used by Coilcraft designers to provide fast turnaround of planar transformer samples. You can experiment with the number of turns, DCR, and the location of the windings within the assembly (interleaving). The pre-designed windings allow quick evaluations and designs that are ready-to-go for production.

You can design planar transformers for the following topologies and power levels, based on 100 kHz switching frequency.

  • Full bridge and half bridge – 140 Watt
  • Push pull converter – 100 Watt
  • Forward converter – 50 Watt
  • Flyback – 25 Watt

The prototype transformers can have up to 12 primary turns and four secondary turns. Effective core cross-sectional area is 0.473 cm2 (0.410 cm2 min). Primary to secondary isolation of the production parts is 1500 Vdc. All specifications can be found in the kit manual.

The prototype can be assembled, placed in the circuit and tested with no tooling expense and no waiting. After your prototype proves successful, your design can be submitted to Coilcraft for a production run.

Contact LTM Sales  to receive your free planar samples and designers kits today!