Current shunt monitors enable high precision voltage sensing in EVs
Current shunt monitors designed to measure small sense voltages across a wide common mode voltage range in electric vehicles (EVs) make up the ZXCT21xQ family. Diodes advised that the single-stage instrumentation amplifiers are suitable current sensing of load / rail currents in brushless DC (BLDC) motor controllers, e-compressors, high power DC/DC converters, on-board chargers (OBCs), battery management systems (BMS), ADAS (advanced driver assistance system) power supplies and wireless phone chargers.
They have a low offset voltage (±30 microV) and gain error (±0.5 and ±0.8 per cent) of the zero drift core (typical ±100nV per degree C) to enable current sensing across the shunt, with maximum voltage drops as low as 10mV (full-scale). According to Diodes, this allows small value sense resistors to be used in high accuracy monitoring of large magnitude currents, while reducing the power lost during measurement. The low quiescent current consumption of 100 microA (maximum) also helps to minimise power consumption, said the company.
The current monitors have a 0 to 26V rail-to-rail common mode sense voltage range (irrespective of supply voltage), enabling both high side and low side precision current measurement. The REF pin enables bi-directional current flow measurement.
There are six voltage gain options in the ZXCT21xQ family, namely 50V/V, 75V/V, 100V/V, 200V/V, 500V/V and 1000V/V). Each has its own order number with three accuracy variants.
All devices in the ZXCT21xQ series are AEC-Q100 Grade 1 qualified, manufactured in IATF 16949 certified facilities, and support PPAP documentation. Each operates over a -40 to +125 degrees C temperature range and are available in industry-standard SOT363 package.
Diodes is a Standard and Poor’s SmallCap 600 and Russell 3000 Index company. It delivers semiconductor products to companies in the automotive, industrial, computing, consumer electronics and communications markets with an expanded product portfolio of discrete, analogue and mixed signal products and packaging technology. Its range of application-specific solutions and solutions-focused sales, coupled with worldwide operations of 32 sites, including engineering, testing, manufacturing, and customer service, address high volume, high growth markets.
