DRV421
- 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
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.
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | DRV421 Integrated Magnetic Fluxgate Sensor for Closed-Loop Current Sensing datasheet (Rev. B) | PDF | HTML | 14 Mar 2016 |
| White paper | Achieve greater precision, reliability with magnetic sensing technology | 26 Jun 2017 | ||
| EVM User's guide | DRV421EVM Users Guide (Rev. A) | 24 Aug 2015 | ||
| Application note | Designing with the DRV421: System Parameter Calculator | 14 Aug 2015 | ||
| Application note | Designing with the DRV421: Control Loop Stability | 05 Aug 2015 | ||
| Application note | Designing with the DRV421: Closed Loop Current Sensor Specifications | 22 Jul 2015 |
Design & development
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RTJ) | 20 | Ultra Librarian |
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