Date: 28/06/2023

Current shunt monitors from Diodes can sense small voltages in EV automotive power sys

The new devices from Diodes for current monitoring in power systems can capture small sense voltages across a wide common-mode voltage range in electric vehicles (Evs). The new ZXCT21xQ family of single-stage instrumentation amplifiers can sense current in load/rail in brushless DC (BLDC) motor controllers, e-compressors, high-power DC-DC converters, on-board chargers (OBC), battery management systems (BMS), ADAS power supplies, and wireless phone chargers.

Here are more details from the Diode's release:
Low offset voltage (±30µV) and gain error (±0.5% and ±0.8%) of the zero-drift core (typical ±100nV/°C) in these devices enable current sensing across the shunt, with maximum voltage drops as low as 10mV (full-scale). This allows small-value sense resistors to be used in high-accuracy monitoring of large-magnitude currents, while reducing the power lost during measurement. Furthermore, the low quiescent current consumption of 100µA (maximum) also helps to minimize power consumption.

These current monitors have a 0-26V rail-to-rail common-mode sense voltage range (irrespective of supply voltage), enabling both high-side and low-side precision current measurement, while its REF pin enables bi-directional current flow measurement. The ZXCT21xQ family has six voltage gain options (50V/V, 75V/V, 100V/V, 200V/V, 500V/V, and 1000V/V), each with its own unique 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°C to +125°C temperature range and are available in industry-standard SOT363 package. The ZXCT21xQ devices are available from $0.321 to $0.451 in 1,000 piece quantities.

News Source: Diodes