Open-loop Hall-effect user-programmable current transducers up to 25A DC, AC or pulsed
May 10, 2012 // Julien Happich
LEM announced the HO series of open-loop ASIC based current transducers, set to deliver better performance in areas such as thermal drift, response time, power supply and noise driven by technology advances in power electronics applications.
The HO series measures AC, DC or pulsed currents with a nominal value of 8, 15 or 25 ARMS, with a response time of 2 to 6 μs. Both of these parameters, and several others, are user-programmable by a simple serial digital bit-sequence, generated by the system's host microcontroller. Other parameters that are user-programmable include reference voltage, over-current detection limits, fault reporting and low power mode. The unit delivers its output as a scaled analogue voltage; in most systems this will be converted to a digital value by an analogue/digital converter (ADC) which requires a reference voltage. The designer can program the LEM HO-series transducer to output a reference of 0.5, 1.5, 1.65 or 2.5V on a dedicated pin. Alternatively, the HO-series can be configured to make measurements relative to an external reference. The current transducer achieves a typical accuracy of 1% and 2.8%, at +25°C and +85°, respectively, without offset, and with a high level of insulation between primary and measurement circuits.
An innovative feature of the HO series is programmable over-current detection, separate from the main current measurement. Using a single measurement range (for both detection and measuring functions), if the transducer must detect an over-current condition at (say) five times the nominal full-scale value, the measurement range must extend up to the over-current limit, reducing available accuracy within the nominal range. Separate over-current detection, with programmable threshold, ensures maximum resolution is maintained up to the nominal full-scale value.
The HO-series transducer operates from a single supply voltage at 3.3 or 5V. It comes in a PCB-mountable 12x23x12mm package which incorporates three separate primary conductors to allow for multi-range measurement configurations (enabling nominal measurement as low as 2.67 ARMS when programmed at 8 ARMS for the nominal range). Versions of the HO-series transducers will be available for both through-hole and surface-mount assembly. The operating temperature range is -40 to +115°C.
Visit LEM at www.lem.comAll news
Conspiracy alleged over Rousset wafer fab closure
March 07, 2014
A class action lawsuit has been filed in Federal Court in New York alleging that Atmel Corp. (San Jose, Calif.) conspired ...
Europe loses PV market lead to Asia in 2013
Driverless car sharing concept focuses on digital comfort
Automated SSL test system authenticates LED technology performance
Paper-thin ultracapacitor aims to boost Li-ion battery performance
Apple set to transform sapphire wafer market
March 07, 2014
The sapphire industry ended an 18 month period of depressed pricing and achieved $936 million in revenue for wafer products ...
FTDI reveals streaming instruction behind new 32bit architecture
AMD taps UK tool for video verification
UHF RFID the radio technology of choice for Industry 4.0
- DSM presents: Select the best plastic for DDR4
- Wireless Sensor Network Challenges and Solutions
- Putting FPGAs to Work in Software Radio Systems Handbook
- Real-Time Spectrum Analysis for Troubleshooting 802.11n/ac WLAN Devices
InterviewWi-Fi is open for business, which is good news for mobile subscribers
Following the news that Netgear has built a Facebook-linked amenity Wi-Fi option into its routers, enabling businesses to offer free Wi-Fi in return for liking the company Facebook page, David Nowicki, ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Freescale is giving away ten RIoTboards, worth 74 dollars each, for EETimes Europe's readers to win.
Designed to run Android operating systems efficiently or to run under Linux, the board is based on the Freescale i.MX 6Solo processor; using the ARM Cortex-A9 architecture.
And the winner is...
In our previous reader offer, Crystal Display was giving...Read more
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.