Compact SMT transformers for gate drivers
TDK has launched two surface mount transformers for gate drivers designs in e-mobility and industrial applications.
The EPCOS B78541A InsuGate SMT transformers have a high working voltage and are suitable for gate driver applications for IGBTs and MOSFETs in e-mobility with qualification according to AEC-Q200 as well as according to AQG vibration profile and in industrial electronics.
The components with a MnZn ferrite core are designed for operating frequencies of 100 kHz to 500 kHz and operating temperatures of -40 °C to +150 °C. Depending on the type, the transformation ratios of the windings are 1:1.08 (B78541A2467A003) or 1:1.07:0.6 (B78541A2492A003). With a low coupling capacitance of only 4 pF, the SMT transformers are also suitable for use with SiC or GaN semiconductors.
- 1200V, compact gate driver with coreless transformer
- High-insulation gate-drive transformer for automotive
Combining the highly resistive plastic material with a CTI ≥ 600 and the special coil design, shorter clearances and creepage distances are possible compared to conventional insulated or potted components, despite the dimensions of 13.85 x 10.5 x 9.2 mm (L x W x H).
The UI7 platform, for example, offers creepage distances between primary and secondary windings of >9.2Â mm. With a partial discharge extinction voltage of at least 840Â V (peak voltage) and AC high voltage testing at 3Â kV (50Â Hz, 1Â s), the 2Â g lightweight components meet IECÂ 61558 for reinforced insulation for working voltages up to 300Â VÂ (AC) or 700Â VÂ (DC) for basic insulation. This is sufficient for many industrial and automotive applications.
The UI7 family includes two reference models to allow possible winding configurations for forward and push-pull topologies with the appropriate number of outputs for switched power supplies (bridge topologies, gate driver circuits, isolated DC-DC converters or galvanically isolated single-channel IGBT driver ICs.
www.tdk-electronics.tdk.com/en/transformers_igbt_fet
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