Features and Benefits
- High accuracy
- 1% Sensitivity error from 25ºC to 125ºC (K version)
- 1.75% Sensitivity error from –40ºC to 150ºC (L version)
- Low Offset <10 mV over temperature
- Non-ratiometric output with reference output
- Compact SOW-16 package
- Internal conductor resistance as low as 0.27 mΩ
- High Isolation - Up to 5 kVRMS Withstand Voltage
- Wide Operating Bandwidth
- 400 kHz
- 4 Pin-selectable Gain Options
- Bidirectional or Unidirectional
- 33 A to 133 A Ranges
- Fast overcurrent detection
- 1.5 µs max response time
- Resistor adjustable set point
- Differential Hall Sensors for Stray-field Immunity
- 3.3 V or 5 V Operation
- Two per board – in-line and low-side placement, located on the motherboard
- Fast response time, high bandwidth – supports 400kHz bandwidth
- High current sensing – +/- 50A bidirectional sensing
- Isolation built in – a basic isolation rating of 1097 VRMS, reinforced rating of 565 VRMS, withstand voltage 4.8 kV
- No sense resistor required - lowers total path resistance & inductance and helps switch faster without ringing
Allegro Current Sensor Benefits over Shunt-Based Approaches
- 3x to 10x smaller size
- Shunt & external circuitry is much larger
- Low W shunt alone can be much larger than our IC package!
- Built-in reinforced isolation
- Shunt-based solutions require an isolated power supply and signal isolation
- Allegro current sensors don’t have any active circuits on the high voltage side, no additional isolation needed!
- In-line made easy
- Same Allegro solution capable of low-side, high-side, or in-line current sensing
- Excellent PWM rejection / common mode transient immunity (CMTI)
- High bandwidth sensing
- Up to 1 MHz bandwidth current sensors are available today!
- Ease-of-use, all necessary signal conditioning built in
- Significant analog design effort is needed for accurate shunt-based solutions
- Allegro current sensors integrate trimmed compensation, plug-and-play!
- MC Package Reduces Heat-sinking Burden vs. Shunt Significantly Lower Power DissipationMeasuring >50 A with shunts can be challenging
- Trade-off between power dissipation and SNR
- ±200 mV full-scale input range for shunt amplifiers
- To maximize SNR a larger shunt yields more voltage and can burn 10’s W
- Smaller shunt resistance reduces input voltage signal and lower SNR
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