Power Management I Product News
TI introduces first 100-V synchronous buck regulator with integrated MOSFETs
Texas Instruments (TI) has expanded its high- voltage point-of-load product line with the introduction of the industry’s first 100-V synchronous buck regulator with integrated MOSFETs. The 600-mA LM5017 is the first in a new family of step-down switching regulators that reduce PCB area and system cost while improving high-voltage reliability in telecommunication, industrial, smart grid and automotive systems. Used in conjunction with the WEBENCH online design tool, the device simplifies high-voltage DC/DC conversion and speeds the design process.
The LM5017 together with the 300-mA LM5018 and 100-mA LM5019, which will be available in April, will enable direct point-of-load voltage regulation from input voltages as high as 100-V. This eliminates external transient voltage suppressors or clamps required to achieve reliable operation in high-voltage applications. Integrated MOSFETs eliminate freewheeling Schottky diodes and improve efficiency. Pin-compatible 4-mm by 4-mm LLP packaging offers a scalable solution that covers a wide range of power requirements. Constant on-time (COT) control architecture provides excellent load transient response with no loop compensation required, further reducing the PCB area and simplifying the power supply design process.
The new switching regulators can also be used as isolated bias supplies for systems requiring small, efficient isolated power supplies. Unlike alternative flyback solutions, the LM5017 operates at switching frequencies up to 1-MHz, dramatically reducing the size and cost of the transformer.
For applications that require fixed frequency operation, TI’s 100-V UCC25230 isolated bias supply switching converter supports up to 200- mA output current and uses a voltage mode control topology with input feed forward.
Texas Instruments | www.ti.com
Intersil unveils low voltage, micropower RS-485/RS-422 transceiver family
Intersil Corporation has launched the ISL3261x series of RS-485/RS-422 transmitters and receivers designed to meet the strict power budgets of battery and remote sensing applications. Operating from an industry-low 1.8V supply voltage and consuming less than 150uW, this new family is the optimal solution for designers who need to increase battery life and/or reduce the size of their power supply. The ISL3261x series includes the ISL32613/14 transmitters and the ISL32610/11/12 receivers. They each operate with voltage ranges from 1.8V to 3.6V, and data rates that reach 256kbps. All of the devices in the series provide 16.5kV ESD protection and operate at up to 125 degrees C, making them ideal for harsh environments and battery-powered or solar-powered sensor applications.
The ISL32613E/14E transmitters consume up
to two orders of magnitude less current when operating at 1.8V versus 3.6V. The ISL32610/11/12E receivers feature symmetrical switching points (±200mV) and increased
Murata Power Solutions launches DOSA compliant 1/32 "brick" 30 W DC/DC converter series
Murata Power Solutions has unveiled the ULT series of isolated 30 Watt DC/DC
converters available in a miniature 1/32 brick industry standard
Distributed-power Open Systems Alliance (DOSA) compatible open frame package. Measuring 19.1 x 23.4 x 8.89 mm, the ULT series takes up significantly less board space than other 30W products
on the market and is available with either through-hole or surface mount option. The ULT series has been designed with a wide (2:1) input voltage range of 36 - 75 VDC to meet the requirements of 48V and 60V battery back-up systems. The initial product release includes 12Vout, 5Vout, and 3.3Vout models with lower voltages to come in the near future. The maximum output power of 30 W is available from the 12Vout model, with the 5V and 3.3V models producing 25W. Line regulation is typically within +/- 0.1% of Vout across all Vin conditions at full load. An external trim function allows the output voltage to be trimmed by + 10 % to - 20% to accommodate losses. Input to output isolation is certified to 1,500 V in accordance with the internationally recognised safety standard EN/UL60950. The ULT series offers features that include
remote On/Off control of either negative or positive logic, Vout trim and a remote sense capability. In addition the converter has a number of protection features including output short circuit protection, over temperature shutdown and input under voltage lockout. The ULT series was designed for a wide range of applications including distributed power architectures in Industrial, Telecommunications, Routing, Optical Networking, Wireless equipment and Microwave Radio/point to point communications. The ULT series is designed to operate in the most severe outdoor environments with an operating ambient temperature range from -40 to +85 degrees C.
Murata Power Solutions | www.murata-ps.com
hysteresis. The symmetrical switching points eliminate duty cycle distortion introduced by “full-failsafe” type receivers, while the larger hysteresis increases noise immunity. Ultra-low bus currents of ±40uA allow more than 256 transmitters on a network, with no repeaters, while still meeting the RS-485 specification’s 32-unit load maximum.
Intersil | www.intersil.com
Microchip announces 25% performance increase for dsPIC digital signal controllers
Microchip has been able to announce a 25% performance increase for its dsPIC33F “GS” series of Digital Signal Controllers (DSCs) for Switch Mode Power Supplies (SMPSs). Now featuring 50 MIPS performance, the dsPIC33F “GS” series of DSCs includes on-chip peripherals for digital-power applications, such as an Analogue-to-Digital Converter (ADC), Pulse Width Modulation (PWM) peripheral and analogue comparators. The performance increase will allow designers to achieve higher efficiencies in power-supply applications and to fully control their products using a single dsPIC33F “GS” DSC at a lower system cost and with more features.
The dsPIC33F “GS” family supports applications such as induction cooking, Uninterrupted Power Supplies (UPSs), inverters, intelligent battery chargers, power factor correction, HID lighting, fluorescent lighting, LED lighting, and AC-to-DC, as well as DC-to-DC power-conversion applications.
38 February 2012
The dsPIC33F “GS” DSCs are available in 28- to 100-pin packages, with 16 - 64K of Flash. The on-chip ADC operates at up to 4 Msps, and the PWM peripherals provide up to 1 nanosecond resolution, with modes supporting all power-conversion topologies. In addition, the DSCs feature up to four on-chip analogue comparators with integrated on-chip digital-to- analogue converters, enabling designers to set trip levels dynamically. The analogue comparators can be used to directly control the PWM functions.
As the new dsPIC33F “GS” DSCs are 100% compatible with existing dsPIC33F “GS” devices, all existing tools and reference designs are supported.
The dsPIC33F “GS” DSCs are available for sampling and volume production in 28- to 100- pin QFN, SOIC, SPDIP, TQFP and VTLA packages.
Microchip | www.microchip.com
Components in Electronics
Industry’s first green midspans cut energy dissipation on network cables in half
Microsemi Corporation has unveiled new high- efficiency Power-over-Ethernet (PoE) midspans that are able to reduce energy consumption on network cables by as much as 50 percent compared to alternative midspans and PoE network switches. The PowerDsine PD-5524G EEPoE midspan complies with IEEE802.3at 2009 standards for delivering up to 30 watts (W) of power to network devices including IP cameras, access control systems and thin clients, over the same standard CAT5 cabling as data. The 24-port PD-5524G midspan cuts the
Ethernet cable energy dissipation by 50 percent, which equates to 240 kilowatt hours (KWh) in annual energy savings assuming continuous operation across 12 ports at full power. Additional energy savings are possible using the PD-5524G midspan’s PowerView Pro secure remote power management features, which enable network administrators to monitor and control power devices (PDs) and their power consumption after hours and on holidays and weekends.
The PD-5524G midspan uses technology
pioneered in Microsemi’s PD-9500G family to significantly reduce power dissipation and energy consumption by delivering power over all four pairs of CAT5 cabling. The PD-5524G midspan is also the first to leverage a distributed power architecture, which enables smaller internal power supplies to be used for real-time requirements and then augmented incrementally, as needed, with Microsemi PowerDsine RPS 450 units or other external switching power supplies. The midspan supports 10/100/1000BaseT data rates and complies with IEEE802.3at standards to
more easily support high-power devices such as PTZ cameras, WLAN access points and thin clients.
“Our EEPoE midspans reduce power losses up to 2.25W per link as compared to any alternative PoE solution currently available in the market, including PoE switches and PoE midspans,” said Sani Ronen, director of marketing for PoE systems at Microsemi. “The ability to add external power supplies not only delivers power scalability but also provides the means to back- up priority ports in the event of a primary supply failure. Multiple PD-5524G midspans also may be configured for mutual midspan-to-midspan backup.” Microsemi’s PD-5524G EEPoE midspan
reduces power dissipation for any standards- compliant PD that is attached to the network, including new PDs and any of the more than 100 million that have already been deployed. The company’s patented EEPoE technology is also used in its PD70x0x ICs, which implement four- pair powering and other techniques for minimizing power losses, dissipation and consumption to enable the development of smaller and more energy-efficient PDs. Microsemi’s EEPoE products are part of a broad range of both two- and four-pair, standard- and high-power PoE solutions, including PSE ICs, splitters, and both managed and unmanaged midspan products in single- to 24-port configurations, with secure remote management capabilities and both IPv4 and IPv6 addressing support.
Microsemi | www.microsemi.com www.cieonline.co.uk
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