PRODUCTS POWER ELECTRONICS THICK-FILM ENHANCES RESISTOR USE
capacity also makes this divice range suitable for braking, snubbing and discharge requirements. This series is said to
incorporate an innovative
UK based ARCOL Resistors has developed the TFBR series of high power density, low profile thick- film technology, high power resistors. The company advises these latest devices are designed for easy assembly and are supplied with a variety of terminal styles. The use of this thick-film
technology, low-inductance design is claimed to be well suited to high frequency operation due to its low inductance characteristics. Thehigh instantaneous pulse
packaging design, providing a high power density in a very low- profile package. The substrate thickness is a tiny 1.0 ± 0.2mm and the power dissipation (on a heat sink) is 100W for the TFBR100, 300W for the TFBR300 and 900W for the TFBR900. Ohmic values are available over the range 5R to 680R. The high instantaneous pulse capacity characteristics (Energy = 120J for pulses = 1s and cycle 2s) of the TFBR series makes the resistors suitable for braking,
snubbing and discharge in traction applications. Other main characteristics
include a tolerance of ±10% standard and an operating temperature is -55°C to 200°C. The TFBR series has an
insulation resistance of 1000MO. Maximum operating voltage is <1000V (subject to resulting power). The temperature coefficient is 150ppm and the TFBR high power resistors are RoHS compliant. Typical applications include
traction, snubbers, switched mode power supplies and non- inductive resistors for high frequency and pulse applications. ARCOL Resistors
www.arcolresistors.com Enter 221 MARINE LEAD CRYSTAL BATTERIES
A range of what is claimed to be one of the world’s cleanest, high performance, batteries is being launched into the UK by Power Protection Solutions Specialist Harland Simon UPS. These latest devices enable yacht and boat manufacturers and owners to reduce the environmental, safety and performance impacts of using traditional Lead Acid and Lead Gel Batteries. The launch of the new range of batteries are available in 2 to 12 Volt versions following years of research
and development to produce a cleaner, safer, better performing range of batteries for use across the marine sector where traditional batteries are currently used. Not only better performing across a range of applications, unlike traditional Lead Acid Batteries which are potentially hazardous to handle and transport as a result of the acid contained within them, the new batteries contain no toxic fluids, cadmium or antimony, are up to 99 percent recyclable and are ISO 14001 certified. They are now available in the UK exclusively through Harland Simon and can be used wherever traditional
Lead Acid and Lead Gel batteries are currently used on yachts and boats for back up and operating power systems and within a range of renewable energy applications. “By the nature of their manufacture and what’s contained within them, traditional Lead Acid and Lead Gel
Batteries are extremely harmful for the environment and come with a range of handling, storage, transport and recycling issues. In addition to coming with a three year factory guarantee, the new batteries charge twice as fast as conventional alternatives, can be 100 percent discharged daily and fully recovered, have a service life of 18 years, can provide in excess of 6000 cycles (dependent on DoD) and can be stored for up to two years with no additional charging required. Harland Simon UPS
www.leadcrystalbattery.co.uk
A new series of isolated 6Watt single and dual output DC/DC converters has been developed by Murata Power Solutions. The DC-DC converters can accommodate up to a 4:1 input range and are available in three nominal input voltage ranges of either 5VDC input (4.5 – 9VDC 2:1 range), 12VDC (9 – 36VDC 4:1 range) or 48VDC (18 – 75VDC 4:1 range). Each nominal input voltage variant
offers seven output voltage models. Four of these are single output versions with +3.3, +5, +12 or +15 VDC output. Three dual output models provide +5, +12 or +15 VDC output options. Recognition of certification to international safety standards UL60950 for IT equipment and 3rd edition medical safety standard UL60601 for 2 MOOP is pending. The DC/DC converters are encapsulated
in order to achieve high levels of thermal performance and are housed in an industry standard package measuring 20.0 by 32.0 by 10.75mm. The operating temperature range is from – 40 to 850
C and the device
is protected against damage due to excess operating temperatures. An input undervoltage lockout feature
Enter 222
protects the output should the input voltage fall below specified limits. Murata
www.murata.eu
DC-DC CONVERTER FOR MEDICAL MARKET
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CONVERTER FOR AUTOMOTIVE
A dual DC/DC converter has been developed by Linear Technology Corporation that uses two internal 2A, 50V switches and an additional 500mA switch to facilitate step-down, step-up, and inverting conversions. Each 2A channel can be independently configured as a buck, boost, SEPIC, flyback, ZETA or inverting DC/DC converter. These topologies and output configurations makes it ideal for industrial and automotive applications. The LT8471 operates from an input voltage
range of 2.6V to 50V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive batteries. The device has 50V internal switches that can
18 MAY 2014 | ELECTRONICS
accommodate applications with inputs and outputs as high as 45V. The device is capable of generating both positive and negative outputs from a single converter, making it ideal for a wide array of biasing applications. A small integrated 500mA boost converter
facilitates both buck and single inductor inverting applications at optimal efficiencies. The switching frequency is programmable and synchronisable from 100kHz to 2MHz, which keeps externals very small. The combination of a TSSOP package and tiny externals ensures a very compact footprint while minimising solution cost. Linear Technology Corporation
www.linear.com
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