In-depth Analysis of HLSR16-P Current Sensor
1. One-sentence Description
The HLSR16-P is an open-loop current sensor with a wide measurement range (±40A) and high bandwidth (400kHz). It supports dual power supplies of 3.3V/5V and is specifically designed for high-precision current detection in industrial drives and new energy systems.
2. Core Features
- Dual Power Supply Compatibility: It supports the input of reference voltages of 3.3V/5V, making it suitable for low-power MCUs.
- Strong Resistance to Magnetic Field Interference: With a built-in three-layer shielding structure, it can withstand an ESD electrostatic discharge of up to 8kV (HBM model).
- Ultra-low Offset Current: The typical value is ±100mA, reducing the complexity of system calibration.
- Stability across a Wide Temperature Range: The operating temperature ranges from -40°C to 105°C, and the temperature drift coefficient is only ±0.075mV/°C.
- Safety Certification: It has passed the UL508/EN61010 certification, and the creepage distance is > 8mm.
3. Core Technical Indicators
| Parameter | Symbol | Unit | Minimum Value | Typical Value | Maximum Value | Remarks |
|---|---|---|---|---|---|---|
| Bandwidth (-3dB) | BW | kHz | - | 400 | - | Fast transient response |
| Linearity Error | ε_L | % | ±0.5 | - | ±0.5 | Full range from 0 to ±40A |
| Noise Density | u_no | μV/√Hz | - | 11.3 | - | In the frequency band of 100Hz~100kHz |
| Temperature Coefficient (Reference Voltage) | TCU_ref | ppm/℃ | -170 | - | 170 | Ensuring stability across the full temperature range |
| Hysteresis Error | I_OM | A | -0.25 | - | 0.25 | Reliable even under 10 times overload |
4. The Story Behind the Chip
The research and development of the HLSR16-P focuses on the challenges of the complex electromagnetic environment in industrial drives and new energy systems:
- Innovative Shielding Technology: It uses a nanocrystalline alloy magnetic core and a three-layer shielding layer to suppress external magnetic field interference.
- Intelligent Calibration Algorithm: Integrates a temperature compensation model to achieve a linearity of ±0.5% (including temperature drift).
- Green Process: It complies with the RoHS standard, and the VO-grade flame-retardant housing reduces environmental pollution.
5. Design Concept
- Flexibility First: It supports the 3.3V SPI interface version (SP option), which is suitable for low-power embedded systems.
- Thermal Management Optimization: The PCB layout reserves heat dissipation space, and the thermal resistance from the junction to the environment is only 20°C/W.
- Safety Redundancy Design: With a double insulation structure, it supports applications at an altitude of 3000m.
- Improved Usability: It provides an external reference voltage input, simplifying the adaptation to ADC interfaces.
6. Application Scenarios
- Industrial Automation: Phase current sampling of frequency converters, closed-loop control of servo motors.
- New Energy Systems: MPPT tracking of photovoltaic inverters, charge and discharge management of energy storage batteries.
- Power Equipment: Energy metering of electric welders, battery health monitoring of UPS.
- Laboratory Instruments: High-precision electronic loads, battery charge and discharge testing systems.
7. Unique Advantages
- Extreme Anti-interference Ability: 8kV ESD protection + 600Vrms isolation voltage, adapting to harsh electromagnetic environments.
- Wide Measurement Range Coverage: A dynamic range of ±40A, supporting the detection of large current transients.
- Benchmark of Low Power Consumption: 19mA@5V (Similar products usually consume > 30mA).
- Ultra-thin Design: A height of 12mm saves 50% of the PCB space (compared with traditional modules).
8. What Engineers Must Know When Selecting
- Range Matching Principle: Ensure that the measured current does not exceed ±40A (Long-term overload may damage the magnetic core).
- Key Points of PCB Layout:
- Keep the main current path straight and away from the noise sources of the switching power supply.
- Copper cladding and grounding shielding for the sensitive area (pins 1-4).
- Use a through-hole with a diameter of 1.6mm to avoid accuracy drift caused by mechanical stress.
- Temperature Compensation Formula:
(The compensation coefficient needs to be adjusted according to the actual temperature range)
- Certification Compliance: It is necessary to cooperate with a 3000Vrms/min insulation test (UL508 standard).
Summary
The HLSR16-P, with its wide measurement range, high anti-interference ability, and high integration, has become an ideal choice for current detection in industrial drives and new energy systems. Engineers only need to pay attention to the details of the PCB layout and the temperature compensation strategy to quickly implement a highly reliable solution.
