SMT transformers boost power, shrink footprint
The gain in power is achieved by increasing the effective cross-sectional area of the core by 40%. This results in lower core losses for a given number of winding turns. In addition, copper losses can be reduced by removing some winding turns. The flat coil windings have 50% lower direct current resistance compared to multilayer PCB technology, and the core design allows for a compact inter-connection and termination of the winding elements.
Transformer specifications include a frequency range of 200 kHz to 700 kHz, primary inductance of 37.8 µH minimum, and isolation of 1500 VDC. The devices operate over a temperature range of –40°C to +125°C.
PH9278NL planar transformers are RoHS-compliant and meet EIA481 requirements for tape-and-reel packaging. Prices range from $3.75 to $4.95 for lots of up to 50,000 units. Lead time is eight weeks.
PH9278NL transformer datasheet
Pulse Electronics, www.pulseelectronics.com
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