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User Guide for ALLEGRO models including: CT4022 Evaluation Board, CT4022, Evaluation Board, Board
Nov 13, 2024 · DESCRIPTION. The CT4022 is a highly linear, XtremeSense™ TMR-based current sensor. The tunneling-magnetoresistance (TMR).
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DocumentDocumentCTD4022 CT4022 Evaluation Board User Guide DESCRIPTION The CT4022 is a highly linear, XtremeSenseTM 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 m, 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 m primary conductor resistance · Ratiometric output from supply voltage EVALUATION BOARD CONTENTS · CT4022 evaluation board Table 1: CT4022 Evaluation Board Configurations Configuration Name CT4022-20AC Evaluation Board CT4022-50AC Evaluation Board Table 2: General Specifications Specification Supply Voltage Range Supply Current Range Input Operating Temperature CT4022-H20BSN8 Variant Input Operating Current CT4022-H50BSN8 Variant Input Operating Current Figure 1: CT4022 Evaluation Board Table of Contents Description .......................................................................... 1 Features ............................................................................. 1 Evaluation Board Contents.................................................... 1 Using the Evaluation Board ................................................... 2 Introduction ...................................................................... 2 Power Input...................................................................... 2 Board Configuration .......................................................... 2 Schematic ........................................................................... 3 Layout ................................................................................ 4 Bill of Materials .................................................................... 5 Related Links....................................................................... 6 Application Support .............................................................. 6 Revision History................................................................... 7 Part Number CT4022-H20BSN8 CT4022-H50BSN8 Min Typ Max 3 3.3 or 5 5 65 65 40 125 20 20 50 50 Units V A ºC A A CTD4022-UM MCO-0001810 November 13, 2024 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. Figure 2: EVB4022 Evaluation Board 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 becoming 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. 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SCHEMATIC The schematic of the CT4022 evaluation board is shown in Figure 3. Figure 3: CT4022 Evaluation Board Schematic 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com LAYOUT The top and bottom layers of the CT4022 evaluation board are shown in Figure 4 and Figure 5, respectively. Figure 4: Top Layer Figure 5: Bottom Layer 4 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com BILL OF MATERIALS Table 3: Evaluation Board Bill of Materials ELECTRICAL COMPONENTS Designator Quantity Description PCB 1 CTD4022 evaluation board U$2 1 CT4022 sensor JP3 3 Male header connectors C1 1 Capacitor, ceramic, 1 µF, 25 V, 10% X7R 4803 VOUT 1 SMA connector C1 1 Capacitor, ceramic, 1 µF, 25 V, 10% X7R 0603 2 Connector heads 2 M3 × 6 mm metal screws for connector heads Manufacturer Allegro MicroSystems Allegro MicroSystems Wurth Elektronik TDK Samtec TDK TE Connectivity UXCell Manufacturer Part Number 61300111121 MSAST168SB7105KTNA01 SAM8971-ND MSAST168SB7105KTNA01 225693-E225693-E a15120300ux0251 5 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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 applications support contact, visit https://www.allegromicro.com/en/about-allegro/contact-us/technical-assistance and navigate to the appropriate region. 6 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Revision History Number Date November 13, 2024 Initial release Description Copyright 2024, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail 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. 7 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com