ALLEGRO CT4022 Evaluation Board
Product Usage Instructions
- This section provides an overview of the connections and configuration options of the CTD4022 evaluation board.
- The proper configuration is shown in Figure 2 and is detailed in the sections that follow.
- Detailed information about the use and functionality of each pin and detailed specifications about the sensor are provided in the CT4022 datasheet.
- For more detailed information than is contained in this user guide, refer to the CT4022 datasheet.
DESCRIPTION
- The CT4022 is a highly linear, XtremeSense™ TMR-based current sensor.
- The tunneling-magnetoresistance (TMR) sensor is differential, which enables common-mode field rejection to cancel out stray magnetic fields.
- The primary conductor is only 0.5 mΩ, which enables the sensor to withstand high inrush current and to minimize power loss.
- The current applied to the pin of the primary conductor generates an internal differential magnetic field.
- The TMR sensor provides a proportional voltage to the differential magnetic field and simultaneously rejects common-mode stray magnetic fields.
- The pins of the primary conductive path and the sensor leads are galvanically isolated.
- This enables high-side current sensing without the need for additional isolation techniques.
FEATURES
- Optimized for high dV/dt applications
- 500 kHz bandwidth
- Common-mode field rejection
- 0.5 mΩ primary conductor resistance
- Ratiometric output from supply voltage
EVALUATION BOARD CONTENTS
- CT4022 evaluation board
Table 1: CT4022 Evaluation Board Configurations
| Configuration Name | Part Number |
| CT4022-20AC Evaluation Board | CT4022-H20BSN8 |
| CT4022-50AC Evaluation Board | CT4022-H50BSN8 |
General Specifications
Table 2: General Specifications
| Specification | Min | Typ | Max | Units |
| Supply Voltage Range | 3 | 3.3 or 5 | 5 | V |
| Supply Current Range | –65 | – | 65 | A |
| Input Operating Temperature | –40 | – | 125 | ºC |
| CT4022-H20BSN8 Variant | ||||
| Input Operating Current | –20 | – | 20 | A |
| CT4022-H50BSN8 Variant | ||||
| Input Operating Current | –50 | – | 50 | A |
USING THE EVALUATION BOARD
Introduction
- This section provides an overview of the connections and configuration options of the CTD4022 evaluation board.
- The proper configuration is shown in Figure 2 and is detailed in the sections that follow.
- Detailed information about the use and functionality of each pin and detailed specifications about the sensor are provided in the CT4022 datasheet.
- For more detailed information than is contained in this user guide, refer to the CT4022 datasheet.
Power Input and Board Configuration
- Connect a current supply to the two terminal screws and ensure that the current does not exceed 65 A or reduce to less than –65 A.
- Attach a voltage source to VDD and GND that does not exceed 6 V (typically 3.3 V or 5 V). Attach an SMA connector to VOUT to read the output voltage based on the input current.
- The sensor provides a continuous linear analog output voltage that represents the current measurement.
- The output voltage range of OUT is from 10% VCC to 90% VCC with a VOQ of 10% of VCC and 50% of VCC for unidirectional and bidirectional currents, respectively.
Power-On Time
- Power-on time of 200 μs is the amount of time required by CT4022 to start up, fully power the chip, and become fully operational from the moment the supply voltage is applied.
- This time includes the ramp-up time and the settling time (within 10% of steady-state voltage under an applied magnetic field) after the power supply has reached the minimum VCC.
SCHEMATIC
- The schematic of the CT4022 evaluation board is shown in Figure 3.
LAYOUT
- The top and bottom layers of the CT4022 evaluation board are shown in Figure 4 and Figure 5, respectively.
BILL OF MATERIALS
Table 3: Evaluation Board Bill of Materials
| ELECTRICAL COMPONENTS | ||||
| Designator | Quantity | Description | Manufacturer | Manufacturer Part Number |
| PCB | 1 | CTD4022 evaluation board | Allegro MicroSystems | – |
| U$2 | 1 | CT4022 sensor | Allegro MicroSystems | – |
| JP3 | 3 | Male header connectors | Wurth Elektronik | 61300111121 |
| C1 | 1 | Capacitor, ceramic, 1 µF, 25 V, 10% X7R 4803 | TDK | MSAST168SB7105KTNA01 |
| VOUT | 1 | SMA connector | Samtec | SAM8971-ND |
| C1 | 1 | Capacitor, ceramic, 1 µF, 25 V, 10% X7R 0603 | TDK | MSAST168SB7105KTNA01 |
| – | 2 | Connector heads | TE Connectivity | 225693-E225693-E |
| – | 2 | M3 × 6 mm metal screws for connector heads | UXCell | a15120300ux0251 |
RELATED LINKS
- CT4022 product page: https://www.allegromicro.com/en/products/sense/current-sensor-ics/sip-package-zero-to-thousand-amp-sensor-ics/ct4022
APPLICATION SUPPORT
- For samples or application support contact, visit https://www.allegromicro.com/en/about-allegro/contact-us/technical-assistance and navigate to the appropriate region.
Revision History
| Number | Date | Description |
| – | November 13, 2024 | Initial release |
Copyright 2024, Allegro MicroSystems
- Allegro MicroSystems reserves the right to make, from time to time, such departures from the detailed specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products.
- Before placing an order, the user is cautioned to verify that the information being relied upon is current.
- Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.
- The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use nor for any infringement of patents or other rights of third parties which may result from its use.
- Copies of this document are considered uncontrolled documents.
CONTACT
- Allegro MicroSystems
- 955 Perimeter Road
- Manchester, NH 03103-3353 U.S.A.
- www.allegromicro.com
FAQ
- Where can I find more information about the CT4022 product?
- You can find more information about the CT4022 product.
- How can I get samples or application support?
- For samples or application support, visit Allegro and navigate to the appropriate region.
Documents / Resources
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ALLEGRO CT4022 Evaluation Board [pdf] User Guide CT4022 Evaluation Board, CT4022, Evaluation Board, Board |