An isolated dc current sensor is required. Isolation in this case, is from the mains, and it transpires that finding something that will do the job safely is tricky. Three isolated Hall-based current sensing modules are easy to obtain, as far as I can tell, based on: Allegro’s ACS712 or clones Allegro’s ACS758 or clones Winson’s WCS1800 All will work ...
STMicroelectronics has created a 100V capable precision current-sense amplifier with 120dB rejection of PWM signals. Called TSC240 and capable of bi-directional sensing, it will also work with its inputs all the way down to -4V, allowing it to work on nominal 12V, 24V and 48V systems – including in automotive environments as it is AEC-Q100 qualified. Differential input limits are ...
Rutronik has announced a 56A rated minimalist PCB-mount socket range that accepts 4.8 x 8mm blade plugs from three different directions. Made by Lumberg and with the base part number ‘4580 01’ it is “a solution for reliable power transmission and is suitable for operating from -40°C to +120°C”, according to Rutronik. “Certified according to LV 215 and VW 80332 ...
Allegro MicroSystems has turned to tunnelling magnetoresistance (TMR) technology to make a 10MHz bandwidth current sensor with 50ns response time. “Our TMR technology is enabling current sensors that are ten times faster and four times lower noise versus typical Hall-based products,” according to the company, which has called it ACS37100. ACS37100 can “unlock the potential of fast-switching GaN and SiC ...
Vishay has created a 5W 1206 current sense resistor range. Called WSLF1206, it is available in values down to 300μΩ. Only the 300μΩ and 500μΩ versions are rated at 5W, and that is only up to 70°C ambient temperature. This drops to 3W up to 100°C, and lower beyond that. 1, 2 and 3mΩ types complete the range, and they ...
Melexis has added a thermistor input to two of its combined current and voltage sensors. MLX91230KDC-BBC-200-RE is a ±512mT Hall-based sensor and comes in an SOIC8 MLX91231KGO-BBC-000-RE is a -100mV to +256mV shunt sensor and comes in a TSSOP16 “The integration of the NTC input into the MLX91230 and MLX91231 sensors improves the detection of variations in system temperatures. For ...
Allegro MicroSystems is exploiting tunnel magnetoresistance to measure current with ~500kHz bandwidth, and less noise that Hall effect isolated current sensors. Implemented in its CT4022 and CT4032 sensors, the company claims 2.8mArms typical noise when the devices are powered with 5V, and 3.6mArms when the supply rail is 3.3V (lowest noise variant, 25°C, 100kHz BW, 0A). “They achieve a 2x ...
Rohm has created a set of six current sense amplifiers with AEC-Q100 qualification for automotive use. They work with external shunt resistors, and there are two basic types: one (BD1423xFVJ-C) that can sense across the common-mode range of -14 to +80V and runs from 2.7 to 18V, and the other (BD1422xG-C) that can sense across -14 to +40V and runs ...
Rhopoint Components is stocking precision current sensing resistors from VPG Foil Resistors. The 1W surface-mount RBF series measures 6.3 x 3.2mm and offers resistances between 0.01Ω and 1Ω. Tolerances down to 0.5% are available between 0.1 and 1Ω, or down to 1% from 10mΩ to 100mΩ. All the series are available with a temperature coefficient of ±25ppm/°C between -25 and ...
LEM had introduced two fast precision high current sensors for ac, dc and pulsed currents: a 2MHz 1,500A type and 1ns 1,000A type. IN 1500-S is for measuring up to 1.5kA across a 2MHz (±3dB) bandwidth and -40 to +50°C temperature – which is less than the -40°C and +85°C that the rest of the IN family is rated across. ...
