NEWS POWER ELECTRONICS MULTIPHASE SYNCHRONOUS BOOST CONTROLLER


single-phase equivalent. Synchronous rectification


increases efficiency, reduces power loss and eases thermal requirements. The input surge stopper, with adjustable clamp voltage, controls the gate of an N-channel MOSFET to protect against high input voltage transients of greater than 100V


A


multiphase synchronous boost DC/DC controller with input


surge stopper and ideal diode controller has been released by Linear Technology Corporation. The boost controller drives two N- channel power MOSFET stages out- of-phase to reduce input and output capacitor requirements, enabling the use of smaller inductors versus the


and provides inrush current control, overcurrent protection and output disconnect. The integrated ideal diode controller drives another N- channel MOSFET for reverse input voltage protection and voltage holdup or peak detection. The LTC3897 is ideal for


automotive, industrial and medical systems where a step-up DC/DC


converter is needed to efficiently deliver high power in a small solution size. For example, this device can be configured to regulate a 24V/10A output from a car battery (12V) at up to 97% efficiency. The low 55µA quiescent current in Burst Mode operation further extends battery operating life and minimises power loss at light loads. The device itself operates from


an input voltage ranging from 4.5V to 65V, with 75V peak. It can regulate an output voltage as high as 60V and the powerful onboard adjustable 5V to 10V gate drivers are capable of slewing large logic- level or standard threshold MOSFET gates quickly. www.linear.com/product/LTC3897


N-CHANNEL MOSFETS FOR LOAD SWITCHING


Toshiba Electronics Europe has introduced two N-channel MOSFETs for load switches in mobile devices, that deliver low on-resistance. The SSM6K513NU and SSM6K514NU help contribute to high system efficiency, low power consumption and are ideally suited for use in the latest battery operated portable applications. Use of the ‘U-MOS IX-H series’ trench


TWO NEW HIGH POWER TVS DEVICE VERSIONS FOR USE IN AIRCRAFT


Two new transient voltage suppressor (TVS) devices have been added by Microsemi Corporation to its plastic large area device (PLAD) package range. The 18-kilowatt (kW) MPLAD18KP and 36-kW MPLAD36KP TVS families are designed for the lightning protection requirements in aircraft, including the multi-strike lightning standard (RTCA DO-160E), which have grown in importance as a result of the introduction and growing use of composite body airframes. These new products are high power TVS devices in low-profile surface-mount packages with design


features to minimise thermal resistance and cumulative heating. These devices use the company’s plastic large area device (PLAD) technology enabling more effective surface-mount TVS packaging as it combines a large die size with an exposed bottom contact for heat sinking. This improves power handling as compared to through-hole devices. In addition, the devices provide the capability of a bond wire-free part in high vibration environments, supporting high reliability in harsh conditions. According to market research firm Markets and Markets, the global power surge protection device market is


expected to grow from an estimated $2 billion in 2014 to $2.7 billion by 2019, at a compound annual growth rate (CAGR) of 5.3 percent from 2014 to 2019. Addressing these growing trends, the new TVS devices offer protection from switching transients and induced radio frequency interference (RFI), with the ability to suppress transients up to 36,000 watts at 10/1,000μs. Offering the high reliability necessary for the demands of this market, all parts are surge tested and available with various screening and conformance inspection options. Both devices are designed for a variety of applications within the aerospace market, including engine control


units, actuator controls, power distribution, power density improvements, environmental controls, communications and instrumental systems. www.microsemi.com


process helps ensure that the MOSFETs achieve low on-resistances. RDS(ON) rating are 6.5mΩ for the 30V SSM6K513NU and 8.9mΩ for the 40V SSM6K514NU. This allows the new products to reduce heat dissipation resulting from turn-on loss by approximately 40% when compared with Toshiba’s existing products, such as the SSM6K504NU. These devices are suitable for use in electric


power switching applications over 10W. www.toshiba.semicon-storage.com


TDK Corporation has released a new series of robust EPCOS MKP X2 capacitors for EMI suppression. These new components offer a higher rated voltage of 350 V AC. This makes them suitable for EMI suppression in input filters – specifically for applications on the North American market – and output filters of photovoltaic inverters, for example. The capacitance range extends from 0.47µF to 10µF in accordance with the E12 series. Even under severe ambient conditions the new capacitors are characterised by a stable capacitance. https://en.tdk.eu/tdk-en/


MEDICAL WALL MOUNT POWER SUPPLIES MEET LEVEL VI AND TIER 2 STANDARDS


XP Power has announced its ACM06 and ACM18 series of medically- approved wall mount and plug top power supplies that meet the latest Department of Energy (DoE) Level VI and Code of Conduct (CoC) Tier 2 standards. With single outputs of 6W and 18W respectively, they are claimed, use less energy while operating at no load to help reduce the impact on the environment and reduce energy costs. The power supplies feature a high


average efficiency of up to 87.5% typically measured at 25%, 50%, 75%


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and 100% load, meeting the new DoE energy efficiency level VI (US) and CoC Tier 2 requirements in the EU. Both series feature a low no load input power, with all ranges consuming less than 0.075W. Exhibiting versatility, the ACM06 series is


available in 5, 9 and 12VDC output models, while the ACM18 comes in 5, 9, 12, 15, 18 and 24VDC single output models, the most common output voltages to suit most applications. Both offer a choice of detachable input plugs for either the US, UK, EU, China or Australian use. This gives the designer the option of sourcing one or multiple plugs for their specific locations. www.xppower.com


ELECTRONICS | FEBRUARY 2017 23


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