ACS710 - 120 kHz Bandwidth, High Voltage Isolation Current Sensor IC
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This device will be Allegro’s highest resolution current sensor IC suitable for industrial, computer, and commercial applications requiring high voltage isolation. The ACS710 can sense currents of 12.5 to 25 A nominal and inrush peak currents three times higher than nominal making it ideal for motor control applications.
Key advantages
- Industry first open loop Hall-effect sensor IC with closed loop performance (in accuracy and bandwidth)
- The Fast fault response pin saves the application the need for a window comparator circuit as the fault response is monitoring both positive and negative fault currents.
- Voltage isolation without the need for external transformers and opto-couplers.
- Low power loss conductor saves power compared to shunt resistor solutions.
- High side current sensing without the need for an expensive high side op-amp
The ACS710 consists of a precision linear Hall sensor integrated circuit with a copper conduction path located near the surface of the silicon die. Applied current flows through the copper conduction path, and the analog output voltage from the Hall sensor linearly tracks the magnetic field generated by the applied current. The accuracy of the ACS710 is maximized with this patented packaging configuration because the Hall element is situated in extremely close proximity to the current to be measured.
High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees low ripple at output and low offset drift in high-side, high voltage applications. The voltage on the Overcurrent Input (VOC pin) allows customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path (between the IP+ and IP– pins) exceeds this threshold, the open drain Overcurrent Fault pin will transition to a logic low state. Factory programming of the linear Hall sensor IC inside of the ACS710 results in exceptional accuracy in both analog and digital output signals.
The internal resistance of the copper path used for current sensing is typically 1 mΩ, for low power loss. Also, the current conduction path is electrically isolated from the low voltage sensor inputs and outputs. This allows the ACS710 family of sensor ICs to be used in applications requiring electrical isolation, without the use of optoisolators or other costly isolation techniques
Features & benefits
This is a revolutionary current sensor IC architecture with several new features including:
- 125 kHz Bandwidth
- Industry leading noise performance provides improved resolution
- User-adjustable over-current fault level output with 2ms response time can be used to protect switching devices from failure during over-current or short circuit conditions.
- Zero current reference: enhanced accuracy & use in differential circuits
- The device can be optimized for compatibility with 3.3 V supplies used in common analog to digital converter and microprocessor devices.
- Ratiometry pin for enhanced accuracy when used with an ADC
- High isolation voltage, suitable for line-powered applications
- Integrated shield protects against high dV/dt voltage transients
- Low resistance conductor results in low power loss