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EETE JULAUG 2013

Optical jack sockets offer immunity to signal noise Cliff Electronics’ optical jacks are virtually unaffected by electrical noise when transmitting and receiving digital signals. Seven different models are available that conform to the EIAJ/JEITA rectangular standard CP-1210 and also RC-5720 and JIS C5974-1993 F05 standards for digital audio interfaces including fibre-optic interconnections. Matching moulded optical lead assemblies are also available for use with all them. The optical jacks operate with a supply voltage of -0.5 to 7.0V maximum, they take an input voltage of -0.5 to +0.5V maximum and operate in the -20 to +70ºC temperature range. Insertion force is 5.9N minimum to 39.2N maximum, withdrawal force is 5.9N minimum to 39.3N maximum. Body material is PBT +30G, ABS 94-V-O (depending on model) with the shutter made from nylon PA66. The optical jacks are available as single or dual optical transmitter/receiver versions with right-angle PCB mounting and a self-tapping screw hole for panel mounting. Removable and hinged and hinged shutter covers are available depending on individual connector type. Cliff Electronics www.cliffuk.co.uk LED driver features internal PWM generator to offer dimmer benefits The LT3955 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator with an internal 3.5A switch. The device’s internal PWM dimming generator makes it ideal for dri- ving high current LEDs, and it also has features suitable for char- ging batteries and supercapacitors. The LT3955’s 4.5 V to 60 V input voltage range suits a wide variety of applications, including automotive, industrial and architectural lighting. The LT3955 uses an internal 3.5 A, 80 V N-channel MOSFET and can drive up to twelve 300 mA white LEDs from a nominal 12 V input, delivering in excess of 20 watts. The device incorporates a high-side current sense, enabling use in boost mode, buck mode, buck-boost mode or SEPIC topologies. The LT3955 can deliver efficiencies of more than 94% in the boost topology, eliminating the need for external heat sinking. A frequency adjust pin permits the user to program the frequency between 100 kHz and 1 MHz, optimizing efficiency while minimizing external component size and cost. Combined with a 5 mm x 6 mm QFN package, the LT3955 offers a compact high power LED Driver solution. The LT3955 has an internal PWM generator that delivers dimming ratios as high as 25:1 or it can utilize an external PWM signal, delivering dimming ratios of up to 3,000:1. Linear Technology www.linear.com Self-powered DC panel mount voltmeter suits battery monitoring Murata’s DMR20-10-DCM “nanoMeter” is a self-powered autoranging DC voltmeter designed for mounting in an industrystandard “oiltight” 30 and 30.5mm round panel cutout. Occupying minimal space, the round voltmeter has a 7.6mm four- digit LED display and is selfpowered. Connection to the + 6 to + 75 VDC supply to be monitored is all that is required for full operation. No additional components or separate Power Supply is required for the DMR20, making it extremely easy to add into virtually any equipment using a DC supply or batteries. A user configurable jumper provides voltage display to a fixed 0.1 V resolution (input + 6 to + 75 VDC) or to a 0.01 V resolution when the input is below + 51 VDC. With its low power consumption, typically less than 7mA, the DMR20 voltmeter is ideal for use in a broad range of battery-powered applications, battery chargers and renewal energy equipment. The voltmeter is packaged in a rugged plastic housing that has been designed to provide protection to IP67 / NEMA 6 specifications for water ingress. It is supplied with a EPDM rubber gasket and plastic hex nut ready to mount in the industry standard panel cutout. The voltmeter is protected against reverse polarity to a maximum of 100 VDC. A self-resetting internal fuse also provides long-term reliability and protection. The DMR20 can operate from – 25 to + 60ºC. Murata www.murata.eu Transmissive optical sensors target encoder applications Vishay Intertechnology introduced two new AEC-Q101- qualified surface-mount transmissive optical Sensors for automotive and industrial applications. Designed for harsh low- and high-temperature environments, the single-channel TCPT1350X01 and dualchannel TCUT1350X01 feature a wide operating temperature range of -40 °C to +125 °C. The TCPT1350X01 and TCUT1350X01 can be used as position Sensors for encoders in high-temperature environments close to motors, in addition to ignition locks and adaptive headlights. Both sensors can detect motion and speed. With dual channels, the TCUT1350X01 can also be used to detect direction in applications such as electronic power steering (EPS) systems. The single-channel TCPT1350X01 includes an infrared emitter and phototransistor detector located face-toface in a surface-mount package while the dual-channel TCUT1350X01 includes an infrared emitter and two phototransistor detectors. Both sensors have a phototransistor output and an aperture of 0.3 mm, and each operates at a wavelength of 950 nm. The sensors feature compact dimensions of 5.5x4x4mm and offer typical output current of 1.6mA. With a 3.0 mm gap width, the devices can be used with a wide variety of materials and allow for looser mechanical tolerances than sensors with smaller gaps, making them suitable for automotive and industrial applications. Vishay Intertechnology www.vishay.com 42 Electronic Engineering Times Europe July/August 2013 www.electronics-eetimes.com


EETE JULAUG 2013
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