ACT001 NVE | Alldatasheet
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Technical content
ACT001-10E Isolated Current Sensor NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344 -3617 • (952) 829 -9217 • www.nve.com ACT001-10E Isolated Current Sensor Key Features
- For low-current detection and measurement
- On-chip current strap for precise operation
- Electrically isolated for removing ground loops
- −500 mA to +500 mA linear range
- 0.04 mV/V-mA sensitivity
- Ratiometric output for power measurement
- AC or DC measurement
- Ultraminiature 2.5 mm x 2.5 mm x 0.8 mm DFN6
Applications
- AC and DC motor control
- Power measurement
- Overcurrent protection
- Battery management systems
Description
The ACT001-10E is a high-linearity, extremely low-hysteresis current sensor manufactured with NVE’s state-of-the-art tunneling magnetoresistance (TMR) technology. The sensor has an on-chip current strap close to TMR sensor elements that enable highly sensitive and accurate measurements. The sensor output is a bipolar voltage signal proportional to the current through the strap. ACT001-10E Block Diagram
ACT001-10E Isolated Current Sensor NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344 -3617 • (952) 829 -9217 • www.nve.com Operating Specifications Parameter Test Conditions Min. Typ. Max. Units Nominal Bridge Resistance 25°C 10 20 kΩ Sensitivity Operating; 5 V Supply, 25°C 0.03 0.04 0.05 mV/V-mA Frequency Response 300 kHz Linear Range of Current Measurement Operating; Full Voltage and Temperature Range −500 500 mA Saturation Current ±1000 ±1500 mA Output Linearity Over Linear Current Range; Full Oper. Temperature Range 1 % Hysteresis 1 % Bridge Electrical Offset 25°C −2 +2 mV/V Bridge Supply Voltage 0 14 |Volts| Isolation Voltage See Note 1 240 VRMS On-Chip Current Strap Resistance 25°C 0.4 0.65 Ω On-Chip Current Strap Resistance Temperature Coefficient +0.6 %/C Operating Temperature Range Operating −40 150 C Temperature Coefficient of Sensitivity TCOV −0.2 0.2 %/C Offset Drift over Temperature TCO 25 µV/C External Magnetic Interference Rejection 2 mT Notes: 1. For isolation measurement, the sensor is considered a two terminal device: I+ and I- pins (pins 3 and 4) are shorted, and bridge pins (pins 1, 2, 5, and 6) are shorted. Absolute Maximum Ratings Parameter Min. Typ. Max. Units Absolute Maximum Steady-State Current −500 500 mA Bridge Supply Voltage 0 14 Volts Storage Temperature −40 170 C Ambient Magnetic Field Unlimited Note: Exceeding Absolute Maximum Ratings may cause permanent damage.
Figure 3. Differential amplifier circuit. Figure 4. Single-comparator overcurrent circuit.
5.5 V +-
Figure 5. Overcurrent comparator circuit with hysteresis. Three additional resistors set the hysteresis, which is equal to (R3/2R4) / Sensitivity. Figure 6. Power sensor. proportional to power. Since the sensor has no active elements, it is accurate down to zero supply voltage.
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ACT001-10E Isolated Current Sensor NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344 -3617 • (952) 829 -9217 • www.nve.com Pinout The ACT001-10E pinout is as follows: Pin Terminal Description
1 V+ Supply Voltage
2 Out+ Positive Differential Bridge Output
3 I+ Current Terminal 1
4 I− Current Terminal 2
5 Out− Negative Differential Bridge Output
6 V− Ground
Notes: 1. Pins are numbered counterclockwise around the package. 2. Current entering the chip via terminal I+ and leaving the chip via terminal I− produces a positive bridge output. Available Parts Part Number Marking Description ACT001-10E CTA +/- 500 mA isolated current sensor Package Drawing Notes:
- Dimensions in mm.
- TDFN6 package has thermal power dissipation of 320°C/Watt in free air.
- Attaching the package to a circuit board improves thermal performance, especially if the center pad is also soldered to the board.
- The center pad may be left floating or connected to ground. ©NVE Corporation All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright ow ner.
ACT001-10E Isolated Current Sensor NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344 -3617 • (952) 829 -9217 • www.nve.com Datasheet Limitations The information and data provided in datasheets shall define the specification of the product as agreed between NVE and its customer, unless NVE and customer have explicitly agreed otherwise in writing. All specifications are based on NVE test protocols. In no event however, shall an agreement be valid in which the NVE product is deemed to offer functions and qualities beyond those described in the datasheet. Limited Warranty and Liability Information in this document is believed to be accurate and reliable. However, NVE does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. In no event shall NVE be liable for any indirect, incidental, punitive, special or consequential damages (including, without limitation, lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. Right to Make Changes NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions at any time and without notice. This document supersedes and replaces all information supplied prior to its publication. Use in Life-Critical or Safety-Critical Applications Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the customer shall indemnify and hold NVE harmless against all claims and damages. Applications described in this datasheet are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NVE products, and NVE accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NVE product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customers. Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NVE does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customers. The customer is responsible for all necessary testing for the customer’s applications and products using NVE products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customers. NVE accepts no liability in this respect. Limiting Values Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the recommended operating conditions of the datasheet is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. Terms and Conditions of Sale In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NVE hereby expressly objects to applying the customer’s general terms and conditions with regard to the purchase of NVE products by customer. No Offer to Sell or License Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Export Control This document as well as the items described herein may be subject to export control regulations. Export might require a prior authorization from national authorities. Automotive Qualified Products Unless the datasheet expressly states that a specific NVE product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NVE accepts no liability for inclusion or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without NVE’s warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond NVE’s specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies NVE for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NVE’s standard warranty and NVE’s product specifications.
ACT001-10E Isolated Current Sensor NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344 -3617 • (952) 829 -9217 • www.nve.com