FAQ
Frequently Asked Questions
How does a planar transformer differ from a conventional wire-wound transformer?
A planar design uses a flat winding arrangement; this family specifically uses multilayer PCB windings. It offers a low-profile construction option, but losses, leakage, parasitic capacitance and cost remain design-specific. Not every planar transformer is inherently more efficient than a conventional design.
How do I choose between 60 W, 71 W, 90 W and 120 W families?
Start with topology: 60/71 W are flyback families, while 90/120 W are active-clamp forward. Then select the specific part for the required output voltage and current. The power label does not replace input-range, frequency, thermal or insulation validation; every voltage/current pair need not multiply to exactly the family label.
Does a 12 V or 24 V output entry mean I can connect DC and use it directly?
No. A transformer is a magnetic component within a converter, not a regulated DC-DC module. The output depends on topology, controller, switching frequency, ratio, rectification and feedback. Provide input range, output requirements and the controller so the complete circuit can be assessed.
How does 0.5 μH leakage differ from 21, 18 or 280 μH inductance?
Leakage and inductance are different parameters with different measurement arrangements. The 60 W table lists 21 μH±10%, the 71 W table lists 18 μH±10%, and 90/120 W list 280 μH minimum. Leakage is 0.5 μH maximum. Do not relabel 280 μH as a universal typical value or treat leakage as the working inductance.
Can all of these planar transformers be used in LLC or PoE supplies?
No blanket compatibility should be assumed. The documents specify flyback or active-clamp forward, not LLC merely because the construction is planar. The 60/71 W documents mention PoE applications, but the overall PoE power budget, PD controller, losses and compliance still need system review. Transformer power alone is insufficient.
If temperature rise is high, should I simply choose a higher-power part?
Not necessarily. Review input voltage, frequency, flux, winding RMS current, copper and core losses, and cooling. A higher-power family may also change topology and inductance, so it is not a direct replacement. Share operating conditions and thermal measurements for FAE assessment.
Are planar transformers with the same dimensions drop-in replacements?
Dimensions alone are insufficient. Compare topology, ratio, primary inductance, leakage, winding resistance, insulation, polarity and pads. FAE can identify candidates and explain differences, followed by electrical and thermal validation.
How do I request planar transformer pricing, samples or customization?
For a known part, request pricing with the quantity and destination. For a new project, start with topology, input range, output voltage/current and height limits; attach the current datasheet for replacement review. Custom electrical design, mechanics, tooling and timing are evaluated per project.
