Digitally Controlled Power Supplies
ColdWatt has expanded its digital power-conversion portfolio to include platforms aimed at blade and high-end server architectures, as well as rack-optimized servers. ColdWatt's 1625-W ac-dc power supply and 750-W ac-dc power subsystem, pack high efficiency and high power density into a compact 1-U form factor, while maximizing efficiency across the load range.
The 1625-W power module delivers 90% efficiency with a power density of less than 18 W/in3. This module's “Black Box” feature enables system designers to deliver increased reliability and traceability for end users. Critical power parameters such as VIN, VOUT and temperature are continuously monitored and stored at the time of a fault for retrieval and post processing.
The 750-W power subsystem is designed with a narrow form factor to deliver high power density and less than 90% efficiency at less than 20% load. This unit, which is now sampling, surpasses the 88% light-load energy-efficiency target set for 2009 by Climate Savers.
Wide-Input DIN-Rail Supplies
TRACOPOWER's TSP-WR series of DIN-rail power supplies features ultrawide inputs of 120 Vac/230 Vac to 500 Vac, enabling use on practically any single- or three-phase network in the world. Three models are available with 24-Vdc output and nominal current ratings ranging from 7.5 A to 25 A. In addition, a high power reserve guarantees reliable startup of loads with high inrush current and the supplies comply with the IEC 61204-3 EMC standard.
Standard features include overtemperature protection, diagnostic output and external shutdown. Other functions like redundancy, output buffer and battery backup are possible through the use of add-on modules. The operating temperature range is -25°C to 70°C. In addition, a rugged metal case and a vibration and shock-proof construction qualifies the TSP-WR series as true industrial power supplies. Unit pricing starts at $138 for 100 pieces of the 180-W models.
Santa Clara, Calif
High-Efficiency Switch-Mode Device
Enpirion's EN5322QI 2-A buck-mode device is a near drop-in replacement for inefficient linear converters. The device integrates all converter functionality, while requiring only a single input and single output ceramic filter capacitor. It has a 2.4-V to 5.5-V input range and a VID programmable output range from 0.6 V to 3.3 V.
With a total solution footprint of less than 60 mm2, the EN5322QI delivers a power density of more than 70 W/sq in. Key to the high power density is Enpirion's high frequency silicon. The device comes in a 6-mm × 4-mm × 1.1-mm QFN package and is priced at $2.23 each in quantities of 1000.
Fuel Gauge IC
The bq27500 system-side fuel gauge IC from Texas Instruments includes the company's Impedance Track technology for smart phones and other handhelds. The gauge predicts battery life with 99% accuracy to extend run time, protect data and provide a better user experience for mobile handheld users.
The bq27500 accurately measures data from a device's single-cell Li-Ion battery to predict remaining battery capacity under all conditions, even as a battery ages. The IC analyzes precise state of charge by correlating between a battery's voltage and cell impedance, or resistance, and its current integration to adjust remaining state of charge up or down the predicted discharge curve. The bq27500 is available in a 12-pin, 2.5-mm × 4-mm SON package and costs $1.35 each in quantities of 1000.
High-Voltage IGBT Module
An addition to Allegro's Inverter Power Module product line, the SCM1100M series of ICs has a 100-Vac to 240-Vac input voltage and a 5-A to 15-A output current. These ICs can withstand voltages of up to 600 V (IGBT breakdown voltage), providing a robust inverter power module for optimally controlling three-phase motor inverters used to drive motors of residential and commercial appliances.
The IC itself consists of six IGBTs, three pre-drive ICs and six flyback diodes needed to configure the main circuit of an inverter, as well as a bootstrap circuit (three bootstrap diodes and three boot resistors) as a high-side-drive power supply. This enables the main circuit of the inverter to be configured with fewer external components. The devices in the series support the three-shunt method, in which a shunt resistor is used in each phase. This enables small currents to be detected and highly accurate inverter control to be achieved, thus contributing to low motor noise.
Devices in the SCM1100M series are housed in a DIP package with exposed thermal pad for enhanced power-dissipation capacity. Pricing starts at $8.80 each in quantities of 1000.
Integrated FET Modules
Fairchild Semiconductor 's FDMS9600S and FDMS9620S are two highly integrated modules that significantly reduce board space while providing the ability to achieve higher conversion efficiency in synchronous buck designs. Each module in the FDMS96xx series combines a high-side and low-side n-channel MOSFET and one monolithically integrated Schottky diode into a single 5-mm × 6-mm MLP package, thereby saving more than 50% board space over conventional discrete solutions.
The FDMS96xx series also offers a thermally efficient solution due to careful selection of the modules' internal MOSFETs to thermally balance both the high- and low-side FETs for optimal temperature distribution within the package. By distributing heat uniformly throughout the device, the overall temperature of the package surface is minimized. This, in turn, reduces heat in the actual system.
The pin-out of the FDMS96xx series has been carefully designed for a direct and easy connection in pc-board layouts to standard pulse-width-modulated controllers. This concept shortens design time and reduces parasitic inductances in board layout traces, improving overall system efficiency. In quantities of 1000, the FDMS9600S costs $0.90 each and the FDMS9620S costs $0.50 each.
San Jose, Calif.
Polypropylene Film Capacitors
Electronic Concepts' UP30 film capacitor series, designed to enhance the existing UL30 product offering, combines the company's UNLYTIC polypropylene film technology with cost-effective packaging for higher storage capacity and greater voltage-creepage protection. Design breakthroughs include a solid plastic top that adds more than a 1-in. gap between the case and terminal connections; compact packaging that measures approximately 3.5-in. in diameter with 4-in., 5-in. and 6-in. heights; isolation of the capacitor from the outer case; simple package and connection mounting; and configuration as a standard UP33 with a bolt-mount case.
Among the key features of the UP30 film-capacitor series are high-capacitance density ranging from 25 mF to 700 mF, low ESL and ESR, bolt mounting, high rms current capability, voltages ranging from 600 Vdc to 3000 Vdc, coplanar terminals, increased creepage and clearance distance.
ON Semiconductor's NCP590 family of very high precision, dual-output CMOS low-dropout regulators (LDOs) is capable of delivering up to 300 mA per output. A special combination of process and architecture is employed to offer fast customer response and outstanding flexibility. Voltages from 0.8 V to 5 V are available.
The NCP590 is stable with any type of capacitor and under no-load conditions. The set-point output voltage of the NCP590 is accurate to within 60.9% with an operating voltage input up to 5.5 V. With its ultralow-dropout characteristics (150 mV at IOUT equals 300 mA) and low ground current consumption, the devices retain regulation longer and extend battery usage. Offered in a single 2-mm × 2-mm × 0.9-mm DFN-8 package, the NCP590 is priced at $0.37 each in 10,000-unit quantities.
An additional set of 20-V NMOS and PMOS devices from austriamicrosystems now use the company's 0.35-µm high-voltage CMOS technology, H35. The extension allows the integration of 3.3-V, 5-V, 20-V, 50-V and 120-V devices on a single chip without any process changes.
The H35 technology from astriamicrosystems is the first purely CMOS-based high-voltage process that matches BCD performance and chip sizes at much lower process complexity. H35 offers fully scalable high-voltage NMOS and PMOS devices, floating logic libraries, as well as a best-in-class power on-resistance.
For its fully automotive- and medical-qualified H35 process, austriamicrosystems delivers its design environment, HIT-Kit, which comes complete with IO libraries, special utilities optimized for high-voltage CMOS product design and circuit-simulation models.
High-Side Current Monitor
The ZXCT1020 from Zetex Semiconductors is a high-side current monitor that produces a current-output signal with accuracy as high as 1%. With a 2.5-V to 20-V common-mode voltage range, the ZXCT1020 converts voltage across a sense resistor into a ground referenced current output.
Simply configured using low-cost external resistors, the device output can be scaled independently of the sense resistor, using one resistor to set the transconductance, and another to set the overall gain and output impedance.
Extremely low on-chip offset trimming brings a significant improvement in performance, particularly for small sense voltages, typically providing 3% accuracy for a 10-mV sense voltage. This is especially useful for low insertion loss sense in high-current-level monitoring applications, where accuracy is further enhanced by the device's low minimum operating current consumption, typically 25 µA.
Housed in the 5-pin SOT23 package, the ZXCT1020 is priced at $0.475 each in quantities of 10,000.
Current-Sense Resistor Kits
Stackpole Electronics' compact current-sense resistor kits aid design engineers. Enclosed in a small handheld business-card-like binder, the CSKA and CSKL kits offer the most widely used current-sensing resistance values. The kits are a resource for engineers during the design phase of many types of power supplies and other current-sensing applications.
The CSKA kits incorporate all three technologies currently available from Stackpole, including the thick-film CSRN series, the foil-on-ceramic CSRF series and the metal-foil CSNL series. The CSKA kit type is available in EIA standard sizes including 0805, 1206, 2010, and 2512. Values included in the kits range from 5 mV to 800 mV in 1% tolerance.
The CSKL kits feature the CSNL and CSRF technologies. These two series provide ohmic values down to 1 mV in 1% tolerance and in EIA standard sizes of 2010 and 2512.
The current-sense kits have 25 pieces of each of the 25 most widely used resistance values for the CSKA kits, and 25 pieces of each of the 20 most popular ultralow values for the CSKL kits.