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.
기술 문서
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | DRV421 Integrated Magnetic Fluxgate Sensor for Closed-Loop Current Sensing datasheet (Rev. B) | PDF | HTML | 2016/03/14 |
| White paper | Achieve greater precision, reliability with magnetic sensing technology | 2017/06/26 | ||
| EVM User's guide | DRV421EVM Users Guide (Rev. A) | 2015/08/24 | ||
| Application note | Designing with the DRV421: System Parameter Calculator | 2015/08/14 | ||
| Application note | Designing with the DRV421: Control Loop Stability | 2015/08/05 | ||
| Application note | Designing with the DRV421: Closed Loop Current Sensor Specifications | 2015/07/22 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
| 패키지 | 핀 | 다운로드 |
|---|---|---|
| WQFN (RTJ) | 20 | 옵션 보기 |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.