The new current shunt monitors are made to measure tiny sense voltages in electric vehicles (EVs) over a wide common-mode voltage range. Diodes Incorporated recently unveiled the ZXCT21xQ series of current shunt monitors, which are intended to assess tiny sense voltages over a wide common-mode voltage range in electric vehicles (EVs). Automotive applications for these single-stage instrumentation amplifiers include current detection of load/rail currents in brushless DC (BLDC) motor controllers, e-compressors, high-power DC-DC converters, on-board chargers (OBC), battery management systems (BMS), and wireless phone chargers.
These devices provide current sensing across the shunt with maximum voltage dips as low as 10mV (full-scale) thanks to low offset voltage (30V) and gain error (0.5% and 0.8%) of the zero-drift core (typically 100nV/°C). As a result, it is possible to monitor large-magnitude currents with great accuracy and minimal power loss using small-value sensing resistors. Additionally, the 100 A maximum quiescent current consumption contributes to a reduction in power usage.
These current shunt monitors can measure both high-side and low-side precision currents with ease thanks to their 0-26V rail-to-rail common-mode sense voltage range (independent of supply voltage), and they can also measure bidirectional current flow thanks to the REF pin. Six voltage gain variants (50V/V, 75V/V, 100V/V, 200V/V, 500V/V, and 1000V/V), each with a different order number and three accuracy variations, are available in the ZXCT21xQ family.
All ZXCT21xQ series devices support PPAP documentation, are produced in IATF 16949 certified facilities, and are AEC-Q100 Grade 1 certified. Each one is offered in the industry-standard SOT363 packaging and runs between -40°C and +125°C.