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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | DRV421 Integrated Magnetic Fluxgate Sensor for Closed-Loop Current Sensing datasheet (Rev. B) | PDF | HTML | 2016年 3月 14日 |
| White paper | Achieve greater precision, reliability with magnetic sensing technology | 2017年 6月 26日 | ||
| Application note | Designing with the DRV421: System Parameter Calculator | 2015年 8月 14日 | ||
| Application note | Designing with the DRV421: Control Loop Stability | 2015年 8月 5日 | ||
| Application note | Designing with the DRV421: Closed Loop Current Sensor Specifications | 2015年 7月 22日 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RTJ) | 20 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。