Designing with ultra-low voltage MOSFET arrays Design How-To 8/31/2005 Post a comment Using a floating gate charge, Advanced Linear Devices has perfected a way of programming the threshold voltages of MOSFET arrays. With something close to a zero-volt threshold, MOSFET switches can be turned one-or-off with a hare's breath of power. But this will force designers of portable circuits to think differently about the design of their amplifiers, voltage references and current mirrors, suggests developer Robert Chao. This article offers some insights and suggestions.
ATX reference design meets "80 PLUS" initiative Product News 8/30/2005 Post a comment ON Semiconductor touts the industry’s first open ATX power supply reference design certified to meet the so-called "80 PLUS" performance requirements for computing applications. The 250-watt reference design addresses all functional blocks of the ATX power supply, including power factor correction, switch-mode power supply control and regulation, post regulation, and output rectification.
AC/DC quietly delivers for light industry Product News 8/29/2005 Post a comment Lambda's SCS120PW series of single-output, convection-cooled AC/DC power supplies, designed for light industrial devices and data communications routers in an environment where forced-air cooling is not available or low system noise is a top design priority, delivers 120 watts.
"Stretched" quarter-brick beats the heat Product News 8/29/2005 Post a comment Bel's GALW9V647 450-watt single-output DC/DC converter, the newest addition to the company's Sirius family of board-mounted CoolConverter modules and touted as a "stretched" quarter-brick for telecom, networking, and wireless, delivers up to 47 amps at 9.6 volts from a nominal 48-volt input.
Enhanced management software also accents the negative Product News 8/26/2005 Post a comment Potentia Semiconductor's enhanced PowerCenter Designer software, Version 4.0, now supports the company’s complete range of second generation devices, including its latest six-rail, secondary-side power system controllers. It also provides full support for negative voltage rails.
Triple-output supplies fill "pizza box" bill Product News 8/25/2005 Post a comment Power-One's BLP55-3000 and BLP55-3300 triple-output, 55 watt AC/DC power supplies, extensions to the company's BLP55 series, are designed for 1U "pizza-box" applications where cost considerations and flexibility of the physical layout (e.g., position with respect to adjacent cooling devices)are prime design parameters.
USB bus-powered devices put an end to Wall Warts Design How-To 8/23/2005 Post a comment “Every system that supplies power must incorporate some kind of power limits. You don’t want your computer to go dark when you plug in a mouse,” writes a Cypress Semiconductor engineer in this month's issue of the Planet Analog magazine folio. On the other hand, plugging USB disk drive could generate some hefty current surges. Let's think about eliminating those Wall Warts, he says.
Buck-boost converters top 90% efficiency Product News 8/23/2005 Post a comment The National Semiconductor LM2716 buck-boost and LM2717 buck-buck converters each reach more than 90 percent efficiency over a wide load range for extended battery life in embedded computer systems.
Compact switchers connect with datacom, wireless Product News 8/23/2005 Post a comment V-Infinity says the compact dimensions of its new 1U-high, midrange switching power supplies, the VF-S150, with a footprint of just 3.2-by-5 inches and a power density of 6.25 W/in3, ideally suits them to datacom, wireless, and industrial applications.
A fast, accurate, LC compliant DC-DC boost regulator…Is it possible? Design How-To 8/23/2005 Post a comment Circuit integration is a major trend in the electronics industry. For power management designs, the frequency compensation circuit is a critical roadblock since it is off-chip. A user-friendly, accurate, fast, highly LC-tolerant supply circuit is therefore in high demand. Here's a proposed bypass scheme that offers just about everything needed.
Three-in-one battery charger IC Product News 8/22/2005 Post a comment A battery charger from AnalogicTech combines a charging device, reverse blocking diode, and current sensing circuit. It supports charging currents up to 1.5A across an input voltage range of 4.0 to 5.5V.
Power Conditioner for Home Solar System Product News 8/22/2005 Post a comment The Mitsubishi power conditioner transforms direct current power to alternation current power reducing electric conversion loss by 18% and achieving the industry's highest power conversion rate of 95.5%.
Better way to store solar Design How-To 8/22/2005 Post a comment Caltech and MIT are pursueing efficient, economical ways to store solar energy in the form of chemical bonds--an advance that is critical for using sunlight as a renewable source of fuel and chemical feedstocks.
Liquid battery power News & Analysis 8/22/2005 Post a comment A research team at Singapore’s Institute of Bioengineering and Nanotechnology have developed a paper battery that is small and that ingeniously uses the fluid being tested (urine) as the power source.
TFT-LCD regulator offers a cool way out Product News 8/22/2005 Post a comment Touting extremely high efficiency and thus cooler system operation, the EL7585A quad-output regulator from Intersil provides a highly integrated power source for large (19 inches and greater) thin-film-transistor liquid-crystal displays (TFT-LCDs) of the kind used in TVs and desktop monitors. Its so-called boost supply boasts the industry’s largest integrated field-effect transistor for this application, providing up to 3.5 amps.
Coast to coast power Power DesignLine Blog 8/22/2005 Post a comment Trade shows are powering up in September and you won't want to miss out on discussions, technical sessions, and how-to seminars presented at two of the important events to kick-off the back to school season.
AC/DCs sign on for tight duty Product News 8/22/2005 Post a comment Lambda's ZP series of small AC/DC power supplies, a wide ranging family in an industry-standard 2-by-4 inch format, are suited to low-power applications including those requiring fairly tight electrical specifications and multiple outputs. These include data communications, LED signage, and point-of-sale applications, as well as test-and-measurement equipment.
AC/DCs induce a 5-second boost Product News 8/19/2005 Post a comment Weidmuller's seven new regulated DC power supplies tout enhanced capabilities beyond the company's traditional families, including an added "power boost" feature that delivers 130 percent of rated current for up to 5 seconds for inductive loads; built-in module for quick paralleling of supplies; and an alarm to provide instant visual feedback when a power supply is shut down.
Lasers offer AC adapter option Product News 8/18/2005 Post a comment BEA Lasers' 150P family of laser modules is now available as a package with the company's new AC power adapter. Alternatively, the AC adapter is available separately. The adapter plugs directly to an AC power source and provides 6 VDC for the lasers, which can deliver 3, 5, or 7 milliwatts at 635 or 650 nm (depending on model) for alignment, event/edge detection, leveling, metrology, position, robotic control, and security applications.
15-W supplies feed low-cost industrial solutions Product News 8/17/2005 Post a comment MicroPower Direct's HF15W-SPL family of 15-watt AC/DC power supplies, for compact and low-cost applications, are suited to industrial/process control equipment, data acquisition equipment, test and measurement instrumentation, and telecommunications systems.
Streamlining power delivery systems for servers Design How-To 8/17/2005 Post a comment With the electronic loads totaling 280 watts typical — not worst case — the fan losses are still among the largest. As part of our "power is where you find it" August issue theme, an International Rectifier engineer catalogs the places were compute server card cages and telecomm switching stations burn serious energy.
Single-port injector for Gigabit PoE touts a better way Product News 8/16/2005 Post a comment Fremont, Calif.—Phihong's PSA20U single port power injector for power-over-Ethernet (PoE) applications is a module suited to Gigabit systems, i.e., 1000 Mbits/s, as well as for traditional 10baseT or 100baseT systems. Competing Gigbit injectors use special PoE transformers and the like that act like repeater amplifiers to resolve attenuation or insertion loss on the data lines, according to the company; Phihong reportedly does away with these techniques without adding significant insertion