Power Management I Product News Analog Devices unveils data converter with dynamic power control
Advances in factory automation, process controls, and industrial instrumentation are significantly boosting manufacturing productivity and output but those advances are becoming less sustainable due to the density of factory process control systems reaching levels where power consumption and thermal issues are starting to undermine the performance, reliability, and safety of equipment. Analog Devices has responded to this problem with the introduction of a multichannel DAC (digital-to-analogue converter) that provides innovative dynamic power control circuitry which includes ADI’s dc- to-dc switching converters and diagnostic features. This new DAC can enable increased system productivity, while simultaneously lowering power use without affecting either safety or reliability.
The integrated AD5755 data converter is a complete, multichannel control IC (integrated circuit) that incorporates four precision 16-bit DACs with programmable voltage or 4–20-mA
The Sorensen SGI Series from TTi Distribution is now available in the UK and represents the next generation of high-power programmable DC power supplies, designed for exceptional load transient response, low noise and the highest power density in the industry. At the heart of the SG series is a 5 kW power module. Output voltage range can be specified from 0-40 V to 600 V, and one to six modules can be configured in a single chassis to deliver 5 kW to 30 kW of power. Combinations of these chassis can then be easily paralleled to achieve power levels up to 150 kW. Paralleled units operate like one single supply, providing total system current.
The SGI (standing for ‘Sorensen General purpose Intelligent’) features Sorensen’s advanced intelligent control system, which combines onboard intelligent controls with the high-performance power electronics common to all SG family supplies. These controls enable sophisticated sequencing, constant power mode and save/recall of instrument settings.
output drivers, along with dynamic power control. The dynamic power control feature works by continually sensing the load impedance and delivering the required power to the load while minimizing power loss in the rest of the system. This reduces self-heating and temperature elevation. The unparalleled combination of features and performance supports four times more channels than any other integrated converter, enabling up to four times more terminals at twice the performance in a single analogue I/O module. The new converter also lowers power consumption by 80 percent and net thermal rise (silicon temperature minus ambient temperature) by 75 percent compared to other control driver technologies.
“Increased terminal density puts pressure on module size and can result in extra heat generation in industrial systems,” said Mike Britchfield, vice president for the Industrial and Instrumentation Group, Analog Devices. “By reducing power consumption and self-heating,
Programmable precision high-power DC supply from TTi
the dynamic power control function of the AD5755 meets customer requirements for increased channel density. This allows manufacturers to achieve channel-rich designs without having to increase the form factor of their systems or back–off on other performance parameters.”
The 16-bit AD5755 offers a full channel spec with a maximum total unadjusted error of 0.05 %, a relative accuracy of ±0.003% max, and does not require system calibration, which shortens development time and reduces system maintenance costs. In addition, the single chip architecture combines multiple converters, power management, linear and other functions, increasing MTTF (mean time to failure) and improving reliability. Also included are various diagnostics for real-time fault analysis, including communication, connection, and interface alerts, which simplify the design task and boost operational up-time. The device, which supports standard industrial voltage and current output ranges,
can be used with standard HART (Highway Addressable Remote Transducer) protocol modems. Also integrated on-chip is a 5- ppm/°C internal reference, user-accessible offset and gain registers and a 30-MHz SPI (serial peripheral interface) compatible interface. The device is specified over the extended industrial temperature range of –40°C to 105°C and is housed in a 9 mm × 9 mm LFCSP (lead-frame chip scale package)
Analog Devices |
www.analog.com
First 20V synchronous buck controller to integrate key four features
Looping of sequences makes the SGI idea for repetitive testing.
A vacuum-fluorescent graphical display in eight languages, context sensitive ‘soft’ keys and front-panel keyboard simplify programming of the SGI. Remote programming can be specified via GPIB, RS232 or LAN/LXi. Hardware triggers available on the LXi option enable precise timing of events within a test system.
TTi Distribution |
www.tti.com
National Semiconductor has announced a new synchronous voltage-mode buck controller that drives a variety of high-current point-of-load applications in printers, telecom, networking and embedded computing applications. A new addition to National’s PowerWise energy-efficient product family, the LM27402’s advanced features make it one of the industry’s most feature-rich 20V synchronous buck controller. Most point-of-load controllers have incorporated one or two complex features, such as a wide input voltage range, integrated high-current gate drivers with adaptive dead- time, inductor DCR current sensing or on-chip bias supply sub-regulator. The LM27402, however, is the first universal point-of-load controller to integrate all these advanced features into a single chip - key features required for many types of DC-DC applications.
A wide input voltage range of 3V to 20V allows the LM27402 to interface with all intermediate bus voltages, including 3.3V, 5.0V and 12V rails. Integrated inductor DC resistance current sense eliminates the need for resistive power train elements to detect output current. This increases overall power conversion efficiency and allows accurate
New models extend reach of Genesys 3.3kW and 5kW range
Power supply manufacturer TDK-Lambda is extending its Genesys 3.3kW and 5kW compact 2U format programmable power supplies range to increase their application reach. The new models complement existing models in the Genesys 1U, 2U, 3U and Half- Wide portfolio that covers power ratings from 750W to 15kW.
The new 0 - 200Vdc output models, available in both the Genesys 3.3kW and 5kW, are suitable for applications related to the testing of solar cell arrays, and for use in electrolysing sulphuric acid in water purification plants. Extending the Genesys 5kW range, models with 0 - 400Vdc and 0 - 500Vdc outputs offer an option for use with the manufacture and test of flat-panel television displays, where high-power, high-voltage DC supplies are a common requirement. Both can be used for industrial applications that utilise high power halogen heaters which typically require between 200V and 400V to drive them.
As with all of the Genesys 3.3kW and 5kW models, these power supplies have three-phase inputs for operation from 170 to 265Vac or from 342 to 460V, and the 3.3kW models are additionally available in single-phase versions suitable for operation from 170 to 265Vac. The new models feature active power factor
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correction, and extensive safety features, including user-selectable Safe-Start and Auto- Re-Start options. With Safe-Start, the power supply returns to the last used settings after a power interruption, but with the output disabled. With Auto-Re-Start, the supply resumes normal operation without intervention after a power interruption, thereby meeting typical requirements for unattended use. Common to all Genesys models is a built-in RS232/485 interface. Using this, up to 31 power supplies may be controlled in daisy chain over an RS485 line. Analogue remote programming is user selectable 0 - 5V or 0 - 10V via DIP switches on the rear panel. Higher power systems can be realised by connecting up to four units in parallel. In advanced parallel configuration, the master unit reports total system output current, which means that the four units appear as a single power supply, increasing flexibility for system designers.
CE marked in accordance with the Low
Voltage Directive, Genesys conducted and radiated EMI conforms to EN55022-A, FCC-A. Safety approvals include UL60950-1 and EN60950-1. All models carry a five-year warranty.
TDK-Lambda |
www.uk.tdk-lambda.com Components in Electronics
continuous current limit sensing. The current sense threshold level is programmable to accommodate a wide range of load current levels using the smallest inductor possible. Output voltage is adjustable down to 0.6V with a one percent voltage reference providing output voltage set-point accuracy over the full - 40 degrees C to 125 degrees C operating temperature range. An integrated bias supply sub-regulator eliminates the external bias voltage supply to simplify PC board layout. Integrated, high-current MOSFET gate drivers with adaptive dead-time control enable ultra- efficient power conversion with load currents as high as 30A. It also supports programmable soft-start, tracking and pre-biased startup.
National Semiconductor |
www.national.com
Low-profile open-frame DC-DC converter from Murata Power
Murata Power Solutions has introduced the UEI25-120-D48 series of 25W output, 2:1 input range, 12V output, high efficiency, isolated DC- DC converters. Featuring 25W output in one square inch of board area, the UEI25-120-D48 series offers efficient regulated DC power for PCB mounting. The low-profile 24.38 x 27.94 x 8.13mm (0.96" x 1.1" x 0.32") converters accept a 2:1 input voltage range of 36 to 75VDC, ideal for telecom equipment. The series also features a 12V output which can be trimmed up or down by 10% with an external trim resistor, plus high efficiency of up to 87.5%, ensuring minimal heat buildup and allowing 'no-fan' operation.
These DC-DC converters include full magnetic isolation with Basic insulation, up to 2250VDC. For powering digital systems, the outputs offer fast settling to step transients and will accept higher capacitive loads. Excellent ripple and noise specifications assure compatibility to noise-susceptible circuits. For systems requiring controlled startup/shutdown, an external remote on/off control may use a switch, transistor or digital logic. A wealth of self-protection features avoid both converter and external circuit fails. These include input undervoltage lockout and overtemperature shutdown. The outputs
current limit using the 'hiccup' autorestart technique and the outputs are short-circuit protected. Additional features include output overvoltage and reverse conduction elimination.
The UEI25-120-D48 series' industry-standard pinout makes this part a direct replacement for larger 1" x 2" converters. Applications include small instruments, area-limited microcontrollers, data communications equipment, remote sensor systems, telephone equipment, vehicle and portable electronics. It operates in the industrial temperature range of -40 to 85C.
Murata Power Solutions |
www.murate-ps.com
www.cieonline.co.uk
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