Construction technology
Premo Planar Transformers are manufactured with a combination of state of the art and unique production techniques. Our planar transformers combine just copper forms with double sided 0.4mm copper plated FR4 ultrathin substrates, Kapton pre-cut isolation forms and multilayer PCB’s up to 12 layers.
The AC/DC models need extra clearance and creepage distances that are accomplished by the use of a vacuum air-bubbles-free polyurethane resin potting that assures correct horizontal insulation between windings.
All designs are flame- retardant and selfextinguishable as they are produce with UL94-V0 approved materials.
Thermal class can be modified (increased) on demand, as there are three available insulation systems.
All PREMO Planar Transformers are lead free and RoHS compliant.
Key to this catalogue
The present catalogue is devided into two major applications: DC/DC conversion and AC/DC conversion. The main difference is the construction technology to achieve the necessary insulation.
AC/DC products are potted and encapsulated.
There are common features in the data sheets such as schematics for the proposed topologies that, in order to avoid repetitions are presented here.
The main topologies presented both for DC/DC and AC/DC are Flyback, Dual Forward, Forward, Push-Pull, Full Bridge, Half Bridge and Full-Bridge with Zero Voltage Transition.
According to industry use, Power Supplies over 100W have Power Factor Correction Module therefore Vin at the transformer for sizes smaller that PT32- ACDC is just the rectified line voltage but for larger sizes Vin is 350-400V as the typical Vout at the PFC.
Custom design
Main copper frames, ferrite cores, pins, PCB’s and plastic housings are already available for our customers’ tailor made designs. Should you need a planar transformer, which is not in our standard catalogue, please submit following data to Premo:
- Vin min.
- Vin max.
- Vout & Iout (per secondary).
- Switching Frequency.
- Duty Cycle.
- Topology.
- Isolation voltage.
- Efficiency. (If not specified efficiency is maximized)
- Max available room. (If not specified size is minimized)
- Ambient Temperature.
- Clearance & Creepage.
- Cooling Method.
- Assembly method.
|
|
