Electronics News
Archive : 15 March 2007 год
Fluke designed as a tool for servicing and commissioning electronic switching loads including variable frequency drives, electronic lighting and uninterruptible power supply (UPS) systems. Combining the functionality of a power quality meter, oscilloscope and data logger, the Fluke 345 features a convenient clamp-on design for measuring the most common power quality parameters. It features a color display for viewing measurements real-time and can log data to memory for analysis with the included Fluke Power Log software.
Product information
The Hall effect measuring clamp of the Fluke 345 enables users to take true-rms ac and dc current measurements up to 2000 A without disconnecting the load. It features a switchable low-pass filter, enabling users to make effective measurements on variable speed drives and other electrically noisy equipment.
The recording function of the Fluke 345 captures minimum, maximum, and average values for a quick view of events as they occur. For intermittent problems or performance testing, the logging mode can be used to capture measured values of voltage, current, and power with average periods from 1 second to 15 minutes. Logged data can be reviewed on the instrument, or downloaded for further analysis and report generation, using the supplied Power Log software.
The Fluke 345 complies with the stringent 600 V CAT IV / 1000 V CAT III safety standard. It measures V, A, Hz, CF, THD, DF, W, VA, VAR, kWh, and Power Factor even on distorted waveforms. Other useful features include a three-phase power mode for making a quick check of current balance, an inrush mode for troubleshooting tripped circuit breakers, and dc ripple measurement capability to assess load effect.
he MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24 communications interface devices feature low power consumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmitter output pins are protected to ±15kV using the Human Body Model.
A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a +3.3V supply. Each device guarantees operation at data rates of 250kbps while maintaining RS-232 output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™: operating mode, while maintaining RS-232-compliant output levels.
The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-powered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively.
The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shutdown mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).
The MAX3222E, MAX3232E, and MAX3241E are available in space-saving SO, SSOP, TQFN and TSSOP packages. The MAX3237E is offered in an SSOP package. The MAX3246E is offered in the ultra-small 6 x 6 UCSP™ package.
“The IR3651, with a pair of IR’s DirectFET® MOSFETs, can achieve greater than 88% system efficiency at 48Vin and 3.3Vout at 6A without a heatsink or airflow,” said Rami Hamze, senior marketing manager for IR’s DC-DC Computing Products. “Another advantage compared to similar devices on the market is IR3651’s higher maximum input voltage rating, enabling a more robust and reliable design,” he added.
The IR3651 is designed to drive a pair of external N-channel MOSFETs up to 25A. Protection features such as programmable soft-start, hiccup current limit and under-voltage lockout are provided for required system-level reliability in the event of a fault condition. The device also offers synchronization which allows simplified system-level EMI filter design.
The new controller includes a 150V half-bridge driver that allows for considerable design flexibility. For instance, the device may be used in low power (less than 60W) non-isolated DC-DC converters for network equipment as well as high power (greater than 200W) pre-regulator stages in regulated isolated converters. As a result, the IR3651 can be applied to designs for 36V inkjet printers, 28V aerospace applications, 24V electric bicycles, 72V battery systems, 18V wall bricks, 12V secondary-side post regulators and general purpose high-voltage, non-isolated DC/DC converters.
Availability and Pricing
The IR3651 is available immediately. Pricing is US $2.00 each in 10,000-unit quantities. Prices are subject to change. The devices are lead-free and are compliant with the Restriction of Hazardous Substances Directive (RoHS).
EL SEGUNDO, Calif. - International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced two new POWIR+™ chipset reference designs, the IRPP3624-05A and IRPP3624-12A. Simplifying and accelerating circuit design, the new reference designs target single-phase synchronous buck converter applications in computing and high-end consumer applications.
The new POWIR+ chipsets, featuring IR’s IR3624MPBF PWM control IC and companion HEXFET® MOSFETs, are supported by these new reference designs and IR’s enhanced design services available at http://powirplus.irf.com/, where the standard designs may be modified to create custom circuits, for faster time-to-market.
“The new reference designs provide an extremely useful and simple way of designing on-board embedded single-phase synchronous buck converters of up to 5A or 12A. The on-line design tool configures the reference designs to meet specific requirements for a variety of input and output voltages, assuring a reliable and dependable reference design,” said Rami Hamze, senior marketing manager for IR’s DC-DC Standard Computing Products.
Technical Highlights
The IRPP3624-05A, optimized for low-current applications up to 5A, achieves 88.5% efficiency with 12V input and 3.3V output. The IRPP3624-12A, targeting medium-current applications up to 12A, achieves 84% efficiency with 12V input and 1.8V output at maximum load. Both reference designs utilize the IR3624MPBF PWM Control IC that includes features such as pre-bias start-up, programmable over-current protection, and 0.6V precision internal reference voltage.
The IRPP3624-05A uses a dual SO-8 MOSFET, the IRF8910PBF, to reduce size and component count. The IRF7823PBF and IRF7832ZPBF SO-8 MOSFETs utilized in the IRPP3624-12A allow higher current due to improved thermal and electrical efficiency.
Each of these fully-tested and characterized POWIR+ reference designs is available with a full suite of online simulation tools. Simulation capabilities include small- and large-signal analysis, switching waveforms, and performance analysis for all components.
Availability and Pricing
The new series of POWIR+ chipset reference designs is available immediately. Customized reference designs are available 1-2 weeks ARO, ordered through the POWIR+ chipset online design tool. Pricing for the standard IRPP3624-05A and IRPP3624-12A is US$150 each per unit. The devices are RoHS compliant and prices are subject to change.
EL SEGUNDO, Calif. - International Rectifier, IR®(NYSE: IRF), a world leader in power management technology, today introduced a new chipset in their XPhase® family of control ICs and phase ICs for scalable multi-phase, interleaved buck DC-DC converters, adding N+1 redundancy, hot-swapping capability and a host of protection features. IR’s new chipset, comprising the IR3510 XPhase Control IC and companion IR3086A and IR3088A Phase ICs, is ideal for powering high-availability CPUs and servers in fault-tolerant applications where live insertion is required.
The IR3510 Control IC implements a simple and efficient synchronous buck topology, combined with input MOSFETs for hot-swapping and output MOSFETs for ORing, to ensure complete system protection against failures such as short circuits. To extend MTBF, average current mode control is used to implement droop sharing between converters without any single point failure modes, thus enabling N+1 redundancy. Additionally, the chipset provides input isolation protection, allowing hot-swapping of power modules without damage, while enabling 100% availability of power to the system.
“International Rectifier’s Hot-Swappable N+1 redundant XPhase voltage regulator chipset is the first to incorporate hot-swapping and active ORing along with a full-featured multi-phase VRM controller,” said Jeff Sherman, senior marketing manager of IR’s DC-DC multi-phase computing products. “We believe it will quickly become a standard in high-availability applications,” he added.
Hot Swappable N+1 redundant AC-DC and DC-DC converters using transformer-based power topologies have been available for many years to provide board-level bulk power in server, telecommunication and netcom systems. Transformer-based topologies, however, are no longer viable solutions for directly powering advanced microprocessors due to decreasing operating voltages, increasing currents, and the proliferation of power rails required. Until now, point-of-load converters have been unable to provide N + 1 redundant power along with the required input to output isolation.
About XPhase
XPhase is IR's distributed multiphase architecture that consists of control ICs and phase ICs that communicate using a simple five-wire bus scheme. Phases can be added or removed without changing the fundamental design. The five-wire analog bus consists of bias voltage, phase timing, average current, error amplifier output and VID voltage. By eliminating point-to-point wiring between the control and the phase ICs, the five-wire bus shortens interconnections, and reduces parasitic inductance and noise. This simplifies PCB layout and gives a more robust design.
Availability and Pricing
The new chipset is available immediately and samples are available to qualified users.
Pricing for the IR3510M is US $7.49 each in 10,000-piece quantities. Pricing for the IR3086A and IR3088A is US $2.20 each in 10,000-piece quantities. Prices are subject to change. The devices are lead-free and are compliant with the Restriction of Hazardous Substances Directive (RoHS).