●The DRV421 is designed for magnetic closed-loop current sensing solutions, enabling isolated, precise dc- and ac-current measurements. This device provides both, a proprietary integrated fluxgate sensor, and the required analog signal conditioning, thus minimizing component count and cost. The low offset and drift of the fluxgate sensor, along with an optimized front-end circuit results in unrivaled measurement precision.
●The DRV421 provides all the necessary circuit blocks to drive the current-sensing feedback loop. The sensor front-end circuit is followed by a filter that can be configured to work with a wide range of magnetic cores. The integrated 250-mA H-Bridge drives the compensation coil, while doubling the current measurement range, compared to conventional single-ended drive methods. The device also provides a precision voltage reference and shunt sense amplifier to generate and drive the analog output signal.
● High-Precision Integrated Fluxgate Sensor
● Offset and Drift: ±8 µT max, ±5 nT/°C typ
● Extended Current Measurement Range
● H-Bridge Output Drive: ±250 mA typ at 5 V
● Precision Shunt Sense Amplifier
● Offset and Drift (max): ±75 µV, ±2 µV/°C
● Gain Error and Drift (max): ±0.3%, ±5 ppm/°C
● Precision Reference
● Accuracy and Drift (max): ±2%, ±50 ppm/°C
● Pin-Selectable Voltage: 2.5 V or 1.65 V
● Selectable Ratiometric Mode: VDD/2
● Magnetic Core Degaussing Feature
● Diagnostic Features: Overrange and Error Flags
● Supply Voltage Range: 3.0 V to 5.5 V
● Fully Specified Over the Extended Industrial Temperature Range of –40°C to +125°C
