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Power Management I Product News

Ericsson introduces digital voltage regulator to minimise space and energy usage

a device footprint of less than 2.5cm2 (0.39in2), making the new device ideal for space-critical applications. The new regulator can also easily be

configured and monitored via the standard PMbus communication protocol and the company’s intuitive graphical user interface, making this the first PMBus-compliant 40A point-of-load SIP device available on the market, and offering designers the ability to fully optimise power management in high board-density applications.

The primary end-use applications are network

Ericsson has introduced an additional member to its Power Modules family of 3E second- generation digital point-of-load (POL) voltage regulators with a new vertical-mount variant of the recently announced 40A-output BMR464 series.

As new boards have to cope with additional

features designers are having to assign board- allocation priorities to ‘core’ components such as microprocessors and limit the space available to ‘peripheral’ devices such as the voltage regulator. The new BMR464-SIP (BMR4642002) looks to

save board space for the core components as it enables vertical mounting – also known as single in-line packaging (SIP), which is often used for devices such as memory chips, voltage regulators and other control boards. This approach delivers

routers, data storage and AdvancedTCA (Advanced Telecommunications Computing Architecture) boards, but the low height of the BMR4642002 also makes it suitable for many other applications when space is at a premium. A synchronisation feature allows several

regulators to be locked to a common switching frequency to eliminate beat frequencies and reduces EMI filtering complexity and the number of external components needed. The BMR464- SIP also features comprehensive circuit protection. Signaling is provided for remote control, power good, current sharing, voltage tracking, voltage margining and remote sense. Voltage setting is done via pin strapping or the PMBus.

Ericsson Power Modules |

New dual channel, current mode step- down switching

regulator from Linear Linear Technology has unveiled the LT3641, a dual channel, current mode step-down switching regulator with a power-on reset and watchdog timer. It has a 4V to 42V input voltage range with 55V transient capability which makes it suitable for load dump and cold crank conditions commonly found in automotive applications which require constant output regulation even with input transients as high as 55V. The LT3641 uses an innovative dual channel design with a high input voltage (4VIN to 42VIN, 55VIN transient capability) nonsynchronous channel, which delivers 1.3A of output current combined with a lower input voltage (2.5VIN to 5.5VIN) synchronous channel, delivering up to 1.1A of continuous output current. Although the part allows separate inputs for each channel, most applications will use the output of the high voltage channel to power the lower voltage channel, offering dual outputs while optimising efficiency and switching frequency. The integrated microprocessor supervisor functions support high reliability applications such as automotive electronic control units. The LT3641 includes one power-on reset timer for each channel and one common watchdog timer. The reset and watchdog timeout periods are

independently adjustable using external capacitors. Tight accuracy specifications and glitch immunity ensure reliable reset operation of a system without false triggering. Its switching frequency is user programmable

from 350kHz to 2.5MHz, enabling the designer to boost efficiency while avoiding critical noise- sensitive frequency bands. Similarly, its low minimum on-time enables it to offer high switching frequencies even with high step-down ratios.

The LT3641 can deliver output voltages as low as 1.26V on its high voltage channel and down to 0.6V on its low voltage channel, enabling it to power the latest generation of microprocessors. Its low ripple Burst Mode operation reduces quiescent current to only 290µA with less than 15mVPK-PK of output ripple, making it well suited for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life.

Linear Technology | TI’s green PWM controllers boost power supply efficiency

density isolated power supplies for telecommunications, server and industrial systems.

Texas Instruments (TI) has introduced two high- efficiency PWM power supply controllers with integrated, programmable-delay synchronous rectifier control outputs and pre-bias start-up circuitry. The UCC28250 and UCC28950 or “green controllers” have been developed to simplify design and boost the efficiency in high-

The devices support multiple high-frequency topologies, such as half-bridge, full-bridge, interleaved forward and push-pull, that may have stringent pre-bias start-up requirements and support multiple high-efficiency topologies. The UCC28250 is the industry’s first half bridge or full bridge PWM controller with the ability to maintain a monotonic output voltage ramp under pre-biased load conditions and has eliminated the need for external circuitry. It can support primary- or secondary-side control and delivers up to 95-percent efficiency and high power density in high-input voltage isolated DC/DC applications, such as power modules used in wireless base stations or industrial power systems.

TI has also introduced the new UCC28950,

which provides two additional PWM outputs for phase-shifted full bridge control up to 600 watts and achieves greater than 90-percent efficiency. The advanced controller integrates synchronous rectifier control and provides adaptive zero

voltage switching over a wide input and output voltage range to reduce switching loss, which increases efficiency by 20 percent compared to competitive devices. The UCC28950 improves power supply performance in high-density power architectures for industrial, telecom and DC motor drives.

Among some of its key features and benefits

are that it allows designers to choose half-bridge with voltage mode or full-bridge with voltage/current mode for faster response; light load management improves efficiency by 70 percent and a 50- to 100-percent lower input and output ripple current allows the use of smaller input and output capacitors. Both controllers are supported by various modeling and component selection tools to help speed power supply design, including PSpice transient models, PSpice average models, MathCAD design tools, applications notes, evaluation modules and power supply reference designs.

Texas Instruments | 200W power supply for outdoor event and broadcast systems

Gresham Power Electronics, the MIL and Commercial power conversion specialist, has introduced the PS200-48-32-GR wide input range AC/DC single output power supply designed for use in outdoor lighting and sound control systems.

The input range of 90–288 VAC is designed to be used from AC power available from stadium and outdoor power sources. The single output is customer selectable between 32V and 48VDC at 200W. According to Jake Moir, Managing Director of

Gresham Power, “With the growth of outside broadcast, music and similar events we have found a growing market for a power supply with a wide input range. In the USA such events frequently take power from street lighting which may be up to 277 volts and which would stress conventional switch mode power supplies

44 September 2011

reducing their reliability or in the worst case causing them to fail immediately. Our new 200 watt power supply is not only designed to accommodate a very wide input range but also allows the user to select their required output voltage, simplifying the end system design process and reducing inventory.” The Gresham Power PS200-48-32-GR has a

typical efficiency of 86% at 230Vac and full load, power factor of 0.90 typical at 230VAC, has a hold-up time of 16ms minimum; is brown out, over voltage, over current and over temperature protected, has an operating temperature range from -5 to +50ºC with optional -40ºC version exterior range available on request. The power supply has dimensions of 27 x 84 x 38mm (3.3” x 5.0” x 1.5”) and weighs 700gm max (26oz). The unit meets FCC CLASS B, CISPR 22 CLASS B, EN55022 CLASS B with external

Components in Electronics

austriamicrosystems unveils high-efficiency 3A step- down converter

austriamicrosystems has launched the AS1328, a high-efficiency 1.5 MHz synchronous DC-DC step-down converter. The AS1328 an deliver up to 3A of output current at output voltages as low as 0.6 V while operating from an input voltage of 2.7 to 5.5 V over a -40°C to 85°C temperature range. Fixed-output voltage versions are available in 50 mV increments or, alternatively, the output voltage can be set from 0.6 V to the input voltage via an external resistor divider. In addition, the AS1328 buck converter incorporates a Softstart feature that minimises the initial inrush current and is available with a “power okay” function or “low battery” detection signal. Board space is conserved by incorporating

line filter, meets all international safety agency approvals, is CE Marked and has an expected MTBF greater than 300,000 hours per BELCOR 332,issue 6 specification @ 30 degrees C.

Gresham Power |

internal compensation components as well as two switches with RDSon of only 35 mOhm. Housed in a tiny 3 x 3 mm TQFN package, the AS1328 buck regulator features a high fixed switching frequency of 1.5 MHz, allowing the use of small surface mount inductors. The input voltage range of the AS1328 DC- DC step-down converter makes it suitable for applications powered by a single Li-Ion battery, while its small footprint enables the AS1328 to be used in portable devices such as medical instruments, mobile internet devices and tablet PCs. Applications requiring high currents are also targets for the AS1328, including solid state drives, set top boxes, base stations, telecom and network equipment and FPGAs.

austriamicrosystems |

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