In-depth Analysis of HLSR10-P Current Sensor
1. One-sentence Description
The HLSR10-P is a 5V-powered, low-power consumption, high-bandwidth (400kHz) open-loop current sensor specifically designed for the industrial and new energy fields. It supports a measurement range of ±10A and features an ultra-thin size and stringent safety certifications.
2. Core Features
- Open-loop Fluxgate Technology: No secondary-side power supply is required, simplifying the system design.
- Ultra-low Power Consumption: The typical power consumption is only 19mA (with a 5V power supply), which is energy-efficient.
- Ultra-thin Package: With a height of only 12mm, it is suitable for high-density PCB layout.
- Stability across a Wide Temperature Range: The operating temperature range is from -40°C to 105°C, and the temperature drift coefficient is as low as ±0.075mV/°C (typical).
- Safety Redundancy: UL508/EN61010 certification, creepage distance > 8mm, and can withstand an 8kV ESD electrostatic shock.
3. Core Technical Indicators
| Parameter | Symbol | Unit | Minimum Value | Typical Value | Maximum Value | Remarks |
|---|---|---|---|---|---|---|
| Bandwidth (-3dB) | BW | kHz | 400 | Fast transient response | ||
| Linearity Error | EL | % | ±0.5 | - | ±0.5 | Full range from 0 to ±10A |
| Noise Density | u_n0 | μV/√Hz | 28 | 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 | LOM | A | -0.25 | 0.25 | Reliable even under 10 times overload |
4. The Story Behind the Chip
The HLSR10-P is based on LEM Group's more than 30 years of technical accumulation in the field of current sensing, and it is specifically developed to meet the miniaturization and high-reliability requirements of industrial automation and new energy equipment. Its core innovations lie in:
- Patented Magnetic Core Design: Using nanocrystalline alloy materials to balance high magnetic permeability and low loss;
- Self-developed ASIC Chip: Integrating a temperature compensation algorithm to achieve a linearity of ±0.5% (including temperature drift);
- Green Process: Complying with the RoHS standard, and the VO-grade flame-retardant housing reduces environmental pollution.
5. Design Concept
- Minimalism: A single chip integrates the signal conditioning circuit, reducing the number of peripheral components;
- Thermal Management First: The PCB layout reserves heat dissipation space, and the thermal resistance from the junction to the environment is only 20°C/W;
- Safety as the Foundation: Double insulation design (creepage distance > 8mm), supporting applications at an altitude of 3000m;
- Flexible Configuration: Supports external reference voltage input (0.5V~2.65V), adapting to different ADC interfaces.
6. Application Scenarios
- Industrial Drive: Current loop control of servo motors, power monitoring of frequency converters;
- New Energy: MPPT tracking of photovoltaic inverters, charge and discharge management of energy storage systems;
- Power Electronics: Current sampling of charging piles, energy metering of welding equipment;
- Laboratory Instruments: High-precision electronic loads, battery testing systems.
7. Unique Advantages
- The Lowest Power Consumption in the Industry: 19mA@5V (similar products usually > 30mA);
- Extreme Anti-interference Ability: 8kV ESD protection + 600Vrms isolation voltage;
- No Calibration Required: Temperature compensation has been completed before leaving the factory, directly replacing traditional shunts;
- 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 ±10A (long-term overload may damage the magnetic core);
- Key Points of PCB Layout:
- Keep the main current path straight and away from the noise source 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.
- Certification Compliance: It is necessary to cooperate with a 3000Vrms/min insulation test (UL508 standard).
Summary
The HLSR10-P redefines the benchmark for industrial current sensors with its "compact size and high performance". Its ultra-low power consumption, high bandwidth, and stringent safety features make it an ideal choice in the fields of new energy and industrial automation. Engineers only need to pay attention to layout details and range matching to quickly implement a high-precision current detection solution.
