Author Archives: steve bush

Buck and boost chip converts 2A up and down for phones

Diodes is aiming at phones, tablets, and other battery-operated consumer devices with a synchronous buck/boost dc-dc converter with integrated high-side and low-side 25mΩ H-bridge mosfets. Called AP72200, it delivers up to 97% efficiency with 1% voltage regulation accuracy, low quiescent current, and very low output ripple. Using proprietary buck/boost current-mode control, it can handle continuous current ...

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85W and 120W desktop PSUs meet VI efficiency

XP Power has launched 85W and 120W desktop power supplies that meet the latest energy-efficiency standards. ALM85 and ALM120 meet international Energy Efficiency Level VI and CoC Tier 2 standards, applicable for the US, UK and Europe, which set requirements for average active mode efficiency, measured at 25, 50, 75 and 100% load; minimum efficiency ...

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Wasp-inspired drone drags 40x its own weight though complex environments

US and Swiss researchers have created a miniature multi-mode drone that can act as a tug, dragging 40 times its own body weight over obstacles – while helicopter-style aerodynamic lifting would only allow ~2x to be moved. Called FlyCroTug, its operation was partially inspired by wasps. “Wasps can fly rapidly to a piece of food, ...

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Current transformers from RS

RS Components has introduced a range of own-brand (RS Pro) current transformers which includes more than 100 devices. “These RS Pro components target applications including process control, motor control, utility power monitoring, control panels, and in switch-gear used in generators and electrical power distribution systems as well as in energy and building-management systems,” said the ...

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8W off-line switcher up-rated for 480V three-phase industrial power

Power Integrations has up-graded its LinkSwitch-XT2 range of off-line ac-dc power supply chips for use on 480Vac three-phase industrial power rails, swapping the original 725V internal mosfet for a 900V version. Intended for use up to 8W in industrial equipment it can be used in both isolated and non-isolated fly-back topologies. It can also be used ...

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Programmable PXI rack resistors for test and measurement

Pickering Interfaces has launched a family of 110 programmable resistor modules with 2.5W, 5W or 10W power handling capability at 100V or as limited by power. Models 40-251 (2.5W), 40-252 (5W) and 40-253 (10W) are aimed at applications that require accurate medium-power programmable resistance such as a programmable load for the testing of electronic control ...

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LDO Iq as low as 250nA

Microchip has announced a low drop-out linear regulator with 250nA quiescent current. Called MCP1811, the firm claims “faster load line and transient response when compared to other ultra-low Iq LDOs”. Looking at the data sheet (fig 2-24), Vout dips 100mV for 20µs with a 100µA to 10mA load transient (1µF X7R output cap, Vin=4.3V Vout=3.3V). Fig ...

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Precision multi-channel±10V and 0-20mA ADC for industry

Analog Devices has introduced two multi-channel ±10V and 0-20mA precision A/D converters for programmable logic controllers (PLCs) and distributed control system (DCS) modules. Matched current sense resistors and resistor dividers are integrated, using the firm’s iPassives technology – see table below for precision summary. “The high degree of channel-to-channel matching simplifies calibration requirements, and with ...

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UK capacitive touch controller works in tough industrial environments

Aiming at industrial and automotive applications, Hampshire-based TouchNetix has introduced a high-immunity capacitive touch screen controller that can work with thick screens, and even variable thickness screens – performance that is impossible for modified consumer-grade touchscreen controllers, according to the firm. Claimed noise immunity is far higher than competing controllers – 80dB against typically 50-55dB, ...

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