The transformers combine a core and bobbin design that employs a modified EP-core on a raised bobbin. The resulting package can support creepage and clearance requirements up to 14mm primary-to-secondary, and up to 8mm between two secondary outputs. The raised design allows the transformers to operate on a 22.1mm x 15.7mm footprint, which is 30-60% smaller than existing designs using horizontal E-core packages to achieve similar power levels. Further to this, the EP-core design improves noise performance relative to E-core designs. The device series includes universal input offline transformers, with one to three outputs of 3.3V to 24V to demonstrate the capabilities of the package. Custom transformers are also available to customers.
“Many of our metering customers must meet strict safety standards with large creepage distance requirements,” commented Chris Heisel, Product Manager for Metering and Telecom at Wurth Electronics Midcom. “Meanwhile, power requirements for data transmission are increasing, and power supply designers continue to struggle with noise at the transformer. The MID-MHC series employs creative new strategies to meet these challenges.”