Overview
The Allegro ACS758LCB-050B-PFF-T is a member of the ACS758 family of current sensor ICs produced by Allegro MicroSystems. This device provides economical and precise solutions for AC or DC current sensing. It features a precision, low-offset linear Hall circuit with a copper conduction path, which generates a magnetic field that the Hall IC converts into a proportional voltage. The device is optimized for accuracy through the close proximity of the magnetic signal to the Hall transducer and is fully calibrated prior to shipment from the factory.
The ACS758LCB-050B-PFF-T is designed for high-side, high-voltage applications and offers high-level immunity to current conductor dV/dt and stray electric fields through Allegro's proprietary integrated shield technology. This ensures low output voltage ripple and low offset drift.
Key Specifications
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Units |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3 | 5.0 | 5.5 | V | |
| Supply Current | ICC | Output open | 10 | 13.5 | mA | |
| Primary Sampled Current, IP | ±50 | A | ||||
| Sensitivity | Sens | 40 | mV/A | |||
| Current Directionality | Bidirectional | |||||
| Operating Temperature Range | TOP | –40 | 150 | °C | ||
| Power-On Delay | tPOD | TA = 25°C | 10 | µs | ||
| Rise Time | tr | IP step = 60% of IP+, 10% to 90% rise time, TA = 25°C, COUT = 0.47 nF | 3 | µs | ||
| Propagation Delay Time | tPROP | TA = 25°C, COUT = 0.47 nF | 1 | µs | ||
| Response Time | tRESPONSE | Measured as sum of tPROP and tr | 4 | µs | ||
| Internal Bandwidth | BWi | –3 dB; TA = 25°C | 1.2 | % |
Key Features
- Precision and Accuracy: The device features a precision, low-offset linear Hall circuit with a copper conduction path, ensuring accurate current sensing.
- High Immunity to Interference: Allegro's proprietary integrated shield technology provides high-level immunity to current conductor dV/dt and stray electric fields.
- Electrical Isolation: The terminals of the conductive path are electrically isolated from the signal leads, allowing for use in applications requiring electrical isolation without opto-isolators.
- Low Power Loss: The internal resistance of the conductive path is 100 µΩ typical, minimizing power loss.
- High Overcurrent Survival: The thickness of the copper conductor enables the device to survive high overcurrent conditions.
- Lead-Free and Environmentally Friendly: The device is lead (Pb) free, with all leads plated with 100% matte tin and no Pb inside the package.
Applications
- Motor Control: Suitable for motor control applications due to its precise current sensing capabilities.
- Load Detection and Management: Used in load detection and management systems to monitor and control current flow.
- Power Supply and DC-to-DC Converter Control: Ideal for power supply and DC-to-DC converter control applications.
- Inverter Control: Applied in inverter control systems for accurate current sensing.
- Overcurrent Fault Detection: Utilized for detecting overcurrent faults in various electrical systems.
Q & A
- What is the primary function of the ACS758LCB-050B-PFF-T?
The primary function is to provide precise AC or DC current sensing solutions.
- What is the typical sensitivity of the ACS758LCB-050B-PFF-T?
The typical sensitivity is 40 mV/A.
- What is the operating temperature range of the ACS758LCB-050B-PFF-T?
The operating temperature range is from –40°C to 150°C.
- Does the ACS758LCB-050B-PFF-T offer electrical isolation?
Yes, the terminals of the conductive path are electrically isolated from the signal leads.
- What is the internal resistance of the conductive path in the ACS758LCB-050B-PFF-T?
The internal resistance is 100 µΩ typical.
- Is the ACS758LCB-050B-PFF-T lead-free?
Yes, the device is lead (Pb) free and environmentally friendly.
- What are some typical applications of the ACS758LCB-050B-PFF-T?
Typical applications include motor control, load detection and management, power supply and DC-to-DC converter control, inverter control, and overcurrent fault detection.
- How does the ACS758LCB-050B-PFF-T handle high overcurrent conditions?
The device can survive high overcurrent conditions due to the thickness of the copper conductor.
- What is the power-on delay of the ACS758LCB-050B-PFF-T?
The power-on delay is typically 10 µs at TA = 25°C.
- What is the response time of the ACS758LCB-050B-PFF-T?
The response time is typically 4 µs, measured as the sum of propagation delay and rise time.
