ALLEGRO MICRO CT430-50AC Evaluation Board
DESCRIPTION
The CT430 is a high bandwidth and ultralow-noise integrated contact current sensor that uses Allegro patented XtremeSense™ tunnel magnetoresistance (TMR) technology to enable high-accuracy current measurements for many industrial, consumer, and automotive applications. The device supports multiple current ranges where the integrated current-carrying conductor (CCC) handles up to 70 A of current and generates a current measurement as a linear analog output voltage. The device achieves a total output error of less than ±1% full-scale (FS) overvoltage and the full temperature range. The device has a ~300 ns output response time while the current consumption is ~6 mA and is immune to common-mode fields. The CT430 is optimized for high dV/dt applications, which minimizes capacitive coupling to VOUT, allowing the CT430 to be used in switching applications. The CT430 is offered in an industry-standard 16-lead small-outline integrated circuit (SOIC) wide package that is green and RoHS-compliant.
FEATURES
- Integrated contact current sensing for ±50 A
- Optimized for high dV/dt applications
- Integrated current-carrying conductor
- Response time: ~300 ns
- Total error output ≤ ±1% FS, –40°C to 125°C
- Immunity to common-mode fields: –54 dB
- Linear analog output voltage
- Supply voltage: 4.75 V to 5.5 V
EVALUATION BOARD CONTENTS
- CT430-50AC evaluation board
Table 1: CT430-50AC Evaluation Board Configurations
| Configuration Name | Part Number | Sensitivity | Bandwidth |
| CT430-50AC Evaluation Board | CTD430-HSWF50MR | 40 mV/V | 1 MHz |
Table 2: General Specifications
| Specification | Min | Nom | Max | Units |
| Input Operating Temperature | –40 | – | 125 | ºC |
| Input Operating Current | –50 | – | 50 | A |
USING THE EVALUATION BOARD
Introduction
This section provides an overview of the connections and configuration options of the CTD430-50AC evaluation board. The proper configuration is shown in Figure 2 and is detailed in the sections that follow. The CT430 datasheet contains detailed information about the use and functionality of each pin and detailed specifications about the sensor, and it should be consulted for more detailed information than is contained in this user guide.
Power Input
The two large connectors (with screws) are used to connect and drive the external current to be measured. Due to the PCB trace thermal limitation of the CT430 evaluation board, do not exceed 50 APK.
Board Configuration
A fully assembled evaluation board is illustrated in Figure 1 and Figure 2. The current to be measured is connected to the screw connectors located on the right side of the PCB. These connectors are galvanically isolated from the rest of the PCB. The CT430 can be biased by applying a 3.3 V bias voltage between the VDD and GND pins on the PCB and its output can be measured either from the VOUT SMA connector or the VOUT header pin on the PCB. In addition, if C2 is populated with a 100 pF capacitor, the FILTER SMA connector provides a filtered output of the CT430 with a 3 dB cutoff frequency of approximately 100 kHz; otherwise, the 3 dB cutoff frequency is 1 MHz. See Figure 3.
SCHEMATIC
The schematic of the CT430-50AC evaluation board is shown in Figure 4.
LAYOUT
The top and bottom layers of the CT430-50AC evaluation board are shown in Figure 5 and Figure 6, respectively.
BILL OF MATERIALS
| Designator | Quantity | Description | Manufacturer | Manufacturer Part Number |
| PCB | 1 | CT430-50AC evaluation board | Allegro MicroSystems | – |
| U1 | 1 | CT430-HSWF50MR sensor | Allegro MicroSystems | – |
| C1 | 1 | 1.0 µF, X5R or better SMD Capacitor 0603 | TDK | CGA3E1X7R1E105K080AC |
| C2 | 1 | 100 pF, X5R or better SMD Capacitor 0603 (optional) | KEMET | C0603C101K4HACAUTO |
| R1, R2, R3 | 3 | 10 kΩ, ±10% or better SMD Resistor 0603 | Panasonic | ERJ-3GEYJ103V |
| R4 | 1 | 100 kΩ, ±10% or better SMD Resistor 0603 | Yageo | RC0603FR-07100KL |
| VOUT, FLT | 2 | SMA Connectors | Clinch Connectivity | 142-0701-201 |
| J1, J2 | 2 | Screw Connectors | Keystone | 534-7701 |
| J2 | 1 | M3 Terminal Screw Red | Keystone | 36-7701-2 |
| J1 | 1 | M3 Terminal Screw Black | Keystone | 36-7701-3 |
| P1–7, GND, VDD | 9 | Male Header Connectors – Single pin | Wurth Elektronik | 732-5334-ND |
RELATED LINKS
CT430 product page:
https://www.allegromicro.com/en/products/sense/current-sensor-ics/zero-to-fifty-amp-integrated-conductor-sensor-ics/CT430
For samples or applications 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 |
| – | August 9, 2024 | Initial release |
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.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Documents / Resources
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ALLEGRO MICRO CT430-50AC Evaluation Board [pdf] User Guide CT430-50AC Evaluation Board, CT430-50AC, Evaluation Board, Board |
