Page 33

EDNE MAY 2014

Power module with ultra-wide voltage input A 50W ultra-wide-input power module in sixteenth-brick footprint simplifies Power-over-Ethernet (PoE) applications; ultra-wide input voltage from 18V to 75V accommodates 24V and 48V systems, reduces inventories and is also suitable for remote power feed applications. The module is the latest evolution of Ericsson’s PKU family and combines the thermal enhancements integrated in the recently announced PKU4116C module together with an optimised fly-forward topology. The PKU5510E delivers an output current of 15A at 3.3V output and has a built-in functional isolation of 2250Vdc that meets the requirements specified by the IEE 802.3 Ethernet networking standard, and also meets Basic Insulation requirements according to IEC/EN /UL60950. The PKU5510E has been designed for applications that have to accommodate both telecom system bus voltages of 24V and 48V, and also able to supply voltages to Power-over-Ethernet Complete article, here based applications. Bluetooth LE protocol gains over-the-air upgrade Ultra low power (ULP) RF specialist Nordic Semiconductor has announced S110 SoftDevice v7.0, a major release of its Bluetooth low energy stack, for the nRF51822 Bluetooth low energy and 2.4GHz proprietary System-on- Chip (SoC) and the nRF51422 AN T and AN T/Bluetooth low energy multiprotocol SoCs. (A SoftDevice is Nordic's self-contained stack for nRF51 Series SoCs that incorporates an RF protocol and its associated management framework.) S110 SoftDevice v7.0 brings a range of features including Over-The-Air Device Firmware Upgrade (OTA-DFU), concurrent Peripheral / Broadcaster roles, support for concurrent multiprotocol Bluetooth low energy/2.4 GHz RF proprietary operation, and compliance with the latest version of Bluetooth wireless technology (Bluetooth v4.1) allowing end products using the S110 SoftDevice to be qualified to the Bluetooth standard. productroundup Current transducers measure to 25A, in PCB-mount format LEM has added to its range a series of open-loop Hall-effect ASIC based devices measuring up to 25A DC, AC or pulsed; with over-current detection and fault reporting functions, they operate over -40 to +105ºC and have a PCB-mount design with aperture for the primary conductor. In the HO series of PCBthrough hole mounting current transducers, these units provide an aperture of 8 x 8 mm to carry the primary conductor under measurement, extending the options for this form-factor. The new models, for 6, 10 or 25 A nominal measurements of DC, AC, and pulsed signals use LEM’s latest Open-loop Hall-effect ASIC introduced with the launch of the HO 8, 15 and 25-NP & –NSM models. A high level of insulation between primary and measurement circuits, due to the high clearance and creepage distances of more than 8mm and a CTI (comparative tracking index) of 600, allows a test isolation voltage of 4.3 kVRMS/50 Hz/1 min. Complete article, here Transformer-less synchronous MOSFET driver LT8311 is a high efficiency secondary-side MOSFET driver that operates without the need for primary control in an isolated synchronous forward converter. The LT8311’s preactive mode eliminates the need for a signal transformer for primary to secondary-side communication by sensing signals on the secondary side to control synchronous rectification. This mode reduces component count and solution size. The device operates over a 3.7V to 30V input voltage range and is used with a primary-side IC, such as the LT3752/-1. The complete forward converter can operate with input voltages ranging from 6.5V up to 400V+ making it ideal for a wide range of applications including hybrid/electric vehicle automotive requirements. It combines a 10 mA opto-driver and a feedback loop error amplifier to enable output voltage feedback from the secondary to the primary side. The entire system provides fixed frequency peak current mode control. Complete article, here Complete article, here www.edn-europe.com EDN Europe | MAY 2014 33


EDNE MAY 2014
To see the actual publication please follow the link above