Compact surface mount transformers for DC-DC converters

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By Nick Flaherty

TDK has launched a series of surface mount technology (SMT) transformers with high dielectric for DC-DC converter designs.

The EPCOS E13EMHV series supports a wide range of DC-DC converter topologies with a high dielectric strength between the primary and secondary sides is 3000 V AC (50 Hz, 60 seconds). The isolation distances comply with IEC 60664-1, 61558-2-16 standard, achieving a high working voltage of 1000 V DC. Transient overvoltages of up to 2500 Vpeak are permitted.

Measuring 12.9 x 15.8 x 11.4 mm, the B78308*A003 series transformers save space but still meet the requirements for clearance and creepage distances according to the IEC 60664-1 standard (Np/Ns: min. 8.14 mm clearance, min. 11.2 mm creepage) as a result of the internal construction of the transformers.

Two types are available for DC-DC converters in flyback topology with turns ratios of 1 : 0.22 : 0.78 and 1 : 0.33 : 0.7.

Three types are available for push-pull and half-bridge converters with turns ratios of 1 : 1.07 and 1 : 1 : 0.57 : 2.14.

All the transformers are designed for a frequency range from 100 kHz to 500 kHz and have a very low coupling capacitance of only 2 pF.

The permissible operating temperature range is between -40 °C and +150 °C and the components are qualified to AEC-Q200 Rev. D and are suitable for various DC-DC converter topologies and gate driver circuits in e-mobility and industrial electronics.

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