Vishay Intertechnology has introduced a new series of 150W low profile, space-grade planar transformers with multiple output secondaries – the first optimised for 28V input forward converters in avionics, military, and space (AMS) applications.
Offering a lower cost, smaller size, and higher density than traditional planar transformers, the Vishay Custom Magnetics SGTPL-28 series components meet the requirements of MIL-PRF-27 level T, INST-EEE-002, and MIL-STD-981.
In addition to 28V forward converters, the devices released today will be used in high-reliability switch-mode power supplies and active clamp or dual switch forward converters. In these applications, multiple secondary windings with a centre tap can power up to two 12V channels or four 5V channels. Designed for the harshest of environments, the transformers combine their MIL-PRF-27 and MIL-STD-981 qualifications with a rugged package featuring over-moulded windings and high temperature operation to +130°C. SGTPL-28 series devices withstand numerous thermal shock cycles and high levels of mechanical shock and vibration.
The transformers provide up to 40% greater winding fill than traditional planar devices, resulting in a smaller package size to save PCB space and improve efficiency and power density. Their winding technology and internal construction enable easy customisation to meet design-specific requirements, while the devices’ materials and production techniques allow for lower costs. In addition, strategic inventory management results in short lead times, typically without non-recurring engineering (NRE) charges for customisation.
SGTPL-28 series transformers are available with six screening options: P level screening for design validation testing; L level screening for low Earth orbit (LEO) applications; INST-EEE-002 level 2 and level 3; MIL-STD-981 Table VI class B; and MIL-STD-981 Table VI and VII class S.
The devices offer an input voltage range from 18V to 36V, a dielectric withstand voltage of 1250VDC, and leakage inductance of 0.5µH.
Samples and production quantities of the SGTPL-28 series are available now, with lead times of eight weeks for P level screening; 12 weeks for L level screening; 16 weeks for B level screening; and 26 weeks for S level screening.
