TDK has released a series of EPCOS transformers designed for an output of up to 60 W, which are therefore suitable for PoE++ according to IEEE 802.3bt.
STMicroelectronics has introduced a matched balun for its S2-LP 868-927 MHz low-power radio transceiver to help engineers save board space and minimise RF-circuit design challenges in size-conscious products like IoT sensors, smart meters, alarms, remotes, building automation and industrial controls.
Researchers have developed a method of looking inside iron core transformers, enabling them to see the tiny magnetic structures inside a transformer at work during the transforming process — a step towards building more efficient transformers in the future.
Vishay Intertechnology has introduced a planar transformer offering power from 1 to 3 kW in a compact 70 x 53 x 22 mm size. Compared to devices built on traditional winding technology, the Vishay Sfernice PLA51 is said to deliver the same power transfer/conversion while offering higher efficiency and a lower weight and profile.
The SN6505 is a low-noise, low-EMI push-pull transformer driver which is specifically designed for small form-factor, isolated power supplies. It drives low-profile, centre-tapped transformers from a 2.25 to 5 VDC power supply.
The Mini-Circuits STYX4-13HP+ surface-mount 4:1 transformer handles 10 W RF input power from 30 to 1000 MHz. It supports high power requirements in a shielded package measuring only 0.43 x 0.69 x 0.42″.
The Mini-Circuits Z7550-NMNF+ connectorised matching transformer is suitable for many applications, from DC to 2300 MHz, where 50 to 75 Ω matching is required.
STMicroelectronics 2.4 GHz balun design for Nordic Semiconductor nRF51 and nRF24 series transceivers and SoCs27 February, 2013
Ultralow power RF specialist Nordic Semiconductor has announced that STMicroelectronics has developed an integrated 2.4 GHz balun design for Nordic’s nRF51 and nRF24 series transceivers and SoCs (systems-on-chip) that eliminates the need for RF antenna matching circuitry comprising up to eight passive components (capacitors and inductors) and the interconnections between them.
A 1100 kV ultra-high-voltage direct current converter transformer, tested by ABB, is claimed to break the record for the highest DC voltage levels ever.
Maxim has introduced the MAX13256, an H-bridge transformer driver with a wide input-voltage range for isolated power supplies.
TDK-EPC, a group company of TDK, has developed a series of EPCOS EP5 SMT pulse transformers, used to couple gate-drive circuits to MOSFETs and IGBTs operating at switching frequencies within a range of 150 kHz to several MHz.
Data Device has introduced the Total-ACE, a complete solution to MIL-STD-1553 applications.
DC/DC converters offer galvanic (input to output) isolation of typically at least 1 kVDC that means the converter will withstand a test voltage of 1000 VDC for one second placed across the input and output pins without the insulation across the transformer breaking down.
RF transformers are widely used in electronic circuits for impedance matching to achieve maximum power transfer and to suppress undesired signal reflection, voltage or current step-up or step-down, DC isolation between circuits while providing efficient AC transmission and interfacing between balanced and unbalanced circuits such as amplifiers.
RF transformers are widely used in electronic circuits for impedance matching to achieve maximum power transfer and to suppress undesired signal reflection. Part 2 of this article continues the story that began in the July issue.