New-Tech Europe Magazine | October 2018

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protection is provided including short-circuit, overload, over-temperature, output over-voltage, and input under- voltage. Start-up into pre-biased loads is guaranteed, and the isolation rating is 2250VDC from primary to secondary. A remote on/off control is provided with optional positive or negative logic. The part is available with a baseplate option for conduction cooling inside sealed enclosures with no airflow, typical of RFPA applications. This allows full-power operation at up to 85°C baseplate temperature, and up to 4A / 200W output at 100°C baseplate temperature. The full operating temperature range for the device is -40°C to +125°C, with excellent derating characteristics. The half-bridge design of the PKB4216HDPI features the latest PWM controller technology with a high level of integration for low component count and high reliability. Synchronous rectification contributes to cutting-edge efficiency performance leading to high power density and extremely high reliability figures of up to 10.68 Mhrs “The PKB4216HDPI is an exciting addition to our range of RFPA power converters,” explained Olle Hellgren, Head of Business and Product Management at Flex Power Modules. “With OEM’s involved in 5G seeing global design wins and imminent roll out, together with the use of GaN and new-generation LDMOS transistors, the PKB4216HDPI is an ideal fit as a power source. The part will also find applications in the Internet of Things, mobile back- and front-haul, and in-building wireless communication infrastructure, as well as Power over Ethernet (PoE) applications. The new PKB4216HDPI module has been designed and manufactured by Flex Power Modules to deliver the levels of quality and performance that power system designers have come to expect for their system designs. The PKB4216HDPI series is available in production now in OEM quantities.

Murata develops world’s smallest 32.768 kHz MEMS resonator Murata has developed the world’s smallest 32.768 kHz MEMS resonator (the WMRAG series), which is expected to make a significant contribution to reducing the size and power consumption of IoT devices and wearable devices. Demand is growing for compact electronic components that consume less electrical power for use in digital devices for IoT and wearable applications where small size and long operating times are essential to market success. As many modern devices rely on accurate timing, there is an increasing need for low power consumption resonators, which are required to operate continuously to provide timing signals. Based on miniature MEMS technology, the new resonators exhibit stable frequency characteristics with a temperature drift of <160 ppm across their operating range of -30 to 85 °C. Initial frequency accuracy is ±20 ppm which is at the level expected of a more sophisticated (and expensive) crystal resonator. An in-built 6.9pf capacitor reduces the components necessary for the circuit that generates the reference clock signal, thereby reducing the space required as well as giving designers more flexibility in designing their solution. Measuring just 0.9 x 0.6 x 0.3 mm (W x L x H), the new MEMS resonator is over 50 % smaller than a conventional 32.768 kHz crystal resonator that measures 1.2 x 1.0 x 0.3 mm. Available in silicon- based wafer-level chip scale packaging (WL-CSP), the resonator can be fully integrated into an IC made of a homogeneous semiconductor material. The new resonator generates stable reference clock signals by reducing the IC gain based on a low ESR value of 75 kΩ. Internal tests at Murata indicate that the device cuts power consumption by 13% when compared to conventional 32,768 kHz resonators. Mass production of the new resonator is scheduled to begin in December 2018 and devices will be showcased on the Murata booth at CEATEC JAPAN 2018, which will be held at Makuhari Messe from October 16 to 19, 2018. The product will also be on display in Hall C4 Stand 141 at electronica at Messe München from November 13 to 16, 2018.

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