Hall effect current sensor Allegro ACS772ECB-250B-PFF-T for power management and motor control
Product Overview
The Allegro ACS772 family of current sensor ICs offers economical and precise solutions for AC or DC current sensing. Ideal for motor control, load detection and management, power supply and DC-to-DC converter control, and inverter control, these sensors feature a 2.5 s response time for overcurrent fault detection in safety-critical applications. They utilize a precision, low-offset linear Hall circuit with an integrated copper conduction path. The device generates a magnetic field proportional to the primary current, which the Hall IC converts into a proportional voltage. Proprietary digital temperature compensation and integrated shield technology enhance accuracy, temperature stability, and immunity to dV/dt and stray electric fields. The ACS772 provides reinforced galvanic isolation, eliminating the need for external opto-isolators or other isolation techniques.
Product Attributes
- Brand: Allegro
- Technology: Hall-Effect Based
- Certifications: AEC-Q100 Grade 1 qualified, UL60950-1 certified
- Material: Lead (Pb) free, 100% matte tin plating, oxygen-free copper leadframe
- Package: 5-pin package (suffix CB)
Technical Specifications
| Feature | Specification | Details |
|---|---|---|
| Product Type | Current Sensor IC | Hall-Effect Based |
| Bandwidth | 200 kHz | |
| Galvanic Isolation | Yes | Reinforced, 4800 Vrms dielectric strength |
| Current Conductor Resistance | 100 (typical) | |
| Output Signal | Analog Voltage (VOUT) | Proportional to primary current (IP) |
| Response Time | 2.5 s (typical) | |
| Supply Voltage | 5 V | |
| Power Loss | Ultra-low | due to 100 internal conductor resistance |
| Overcurrent Capability | Up to 1200 A (1-second pulse) | Dependent on temperature |
| Operating Temperature Range | -40C to 150C | (Device specific, see Selection Guide) |
| Dielectric Surge Strength | 8000 V | (IEC 61000-4-5) |
| Working Voltage (Reinforced Isolation) | 475 VRMS / 672 VPK or VDC | |
| Clearance | 6.8 mm | (IP leads to signal leads) |
| Creepage | 6.8 mm | (along package body) |
| Distance Through Insulation | 0.47 mm | |
| Comparative Tracking Index (CTI) | 400-599 | (Material Group II) |
| Package Thermal Resistance (RJA) | 7 C/W | (On Allegro evaluation board) |
| Supply Current (ICC) | 10-15 mA (typical) | (VCC = 5 V, no load) |
| Power-On Delay (tPOD) | 64 s (typical) | |
| Output Slew Rate (SR) | 0.67 V/s (typical) | |
| Internal Bandwidth (BWi) | 200 kHz (typical) | |
| Model: ACS772LCB-050U-PFF-T | Primary Sampled Current: 50 A | Sensitivity: 80 mV/A |
| Model: ACS772LCB-050B-PFF-T | Primary Sampled Current: 50 A | Sensitivity: 40 mV/A |
| Model: ACS772LCB-100U-PFF-T | Primary Sampled Current: 100 A | Sensitivity: 40 mV/A |
| Model: ACS772LCB-100B-PFF-T | Primary Sampled Current: 100 A | Sensitivity: 20 mV/A |
| Model: ACS772KCB-150U-PFF-T | Primary Sampled Current: 150 A | Sensitivity: 26.66 mV/A |
| Model: ACS772KCB-150B-PFF-T | Primary Sampled Current: 150 A | Sensitivity: 13.33 mV/A |
| Model: ACS772ECB-200U-PFF-T | Primary Sampled Current: 200 A | Sensitivity: 20 mV/A |
| Model: ACS772ECB-200B-PFF-T | Primary Sampled Current: 200 A | Sensitivity: 10 mV/A |
| Model: ACS772ECB-250U-PFF-T | Primary Sampled Current: 250 A | Sensitivity: 16 mV/A |
| Model: ACS772ECB-250B-PFF-T | Primary Sampled Current: 250 A | Sensitivity: 8 mV/A |
| Model: ACS772ECB-300B-PFF-T | Primary Sampled Current: 300 A | Sensitivity: 6.66 mV/A |
| Model: ACS772ECB-400U-PSF-T | Primary Sampled Current: 400 A | Sensitivity: 10 mV/A |
| Model: ACS772ECB-400B-PFF-T | Primary Sampled Current: 400 A | Sensitivity: 5 mV/A |
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