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1. DESCRIPTION
The ACS733KLATR-40AB-T are a new generation of high bandwidth current sensor ICs from Allegro™. These devices provide a compact, fast, and accurate solution for measuring high-frequency currents in DC/DC converters and other switching power applications. The ACS733KLATR-40AB-T offer high isolation, high bandwidth Hall-effect-based current sensing with user-configurable overcurrent fault detection. These features make them ideally suited for high-frequency transformer and current transformer replacement in applications running at high voltages. The ACS733KLATR-40AB-T are suitable for all markets, including automotive, industrial, commercial, and communications systems. They may be used in motor control, load detection and management, switch-mode power supplies, and overcurrent fault protection applications.
The wide body SOIC-16 package allows for easy implementation. Applied current flowing through the copper conduction path generates a magnetic field that is sensed by the IC and converted to a proportional voltage. Current is sensed differentially in order to reject external common-mode fields. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducers. A precise, proportional voltage is provided by the Hall IC, which is factory-programmed after packaging for high accuracy. The fully integrated package has an internal copper conductive path with a typical resistance of 1 mΩ, providing low power loss.
The current-carrying pins (pins 1 through 8) are electrically isolated from the sensor leads (pins 9 through 16). This allows the devices to be used in high-side current sensing applications without the use of high-side differential amplifiers or other costly isolation techniques.
2. FEATURES AND BENEFITS
1. AEC-Q100 automotive qualified
2. High bandwidth, 1 MHz analog output
3. Differential Hall sensing rejects common-mode fields
4. High-isolation SOIC16 wide body package provides galvanic isolation for high-voltage applications
5. Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design
6. UL60950-1 (ed. 2) certified
- Dielectric Strength Voltage = 3.6 kVRMS
- Basic Isolation Working Voltage = 616 VRMS
7. Fast and externally configurable overcurrent fault detection
8. 1 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
9. Options for 3.3 V and 5 V single supply operation
10. Output voltage proportional to AC and DC current
11. Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
12. Nearly zero magnetic hysteresis
13. Ratiometric output from supply voltage
3. Typical Application Circuit
4. PACKAGE OUTLINE DRAWING
