1. One-Sentence Description
The LF 505-S is a wide-bandwidth current sensor based on Hall-effect closed-loop compensation technology, designed to provide high-isolation precision measurement solutions for DC-AC-pulse currents in rail transportation, industrial frequency conversion, and new energy applications.
2. Core Features
- Closed-Loop Hall Architecture: Utilizes magnetic field balancing principle to achieve zero hysteresis error, with dynamic response speed reaching 1μs level.
- Extreme Environment Adaptability: Operating temperature range of -40°C to +70°C, storage temperature range of -40°C to +85°C, and resistance to vibration and shock.
- Multiple Safety Protections: UL 94-V0 flame-retardant housing, dual insulation design (basic/reinforced insulation voltages of 1250V/690V respectively).
- Modular Installation: Supports M4 screws/PTKA bolts for fixation, with a 30.2mm main circuit aperture compatible with mainstream busbars.
- Smart Diagnostic Interface: Integrated 100mA standard output, compatible with MOLEX 6410 connector, and supports digital signal conditioning.
3. Core Technical Specifications
| Category | Key Parameter | Typical Value/Range | Unit |
| Electrical Performance | Rated Current (IPN) | 500A | A |
| Peak Measurement Range (IPM) | ±800A | A | |
| Bandwidth (-1dB) | DC~100kHz | kHz | |
| Accuracy Metrics | Linearity Error | <0.1% | %FS |
| Temperature Drift Coefficient | ±0.1mA/°C | mA/°C | |
| Dynamic Characteristics | Overload Capability | 3x rated current for 10s | |
| Magnetic Bias Current (IM) | ±0.2mA | mA | |
| Safety Standards | Impulse Withstand Voltage (Uimp) | 12.5kV/1.2/50μs | kV |
| Creepage Distance | 15.2mm | mm |
4. The Story Behind the Chip
The LF 505-S originates from LEM Group’s nearly 40 years of technological expertise in rail transportation. To meet the stringent current detection requirements of high-speed train traction systems (e.g., ±800A EMU converters), the R&D team innovatively integrated the following breakthroughs:
- Nanoscale Hall Element: Uses GaAs material to enhance magnetic field sensitivity.
- DSP Real-Time Calibration Algorithm: Built-in temperature compensation model to eliminate drift.
- Multilayer Ceramic Substrate: Achieves 3800Vac power-frequency isolation barrier.
The product has been certified under the EN 50155 rail equipment vibration standard and has been installed in over a million units.
5. Design Philosophy
The LF 505-S adheres to three core design principles:
- Ultimate Isolation: Dual insulation system with 14.5mm air gap to withstand harsh electromagnetic environments.
- Full-Condition Optimization: Specifically optimized for fast transients (di/dt=100A/μs) to reduce delay time.
- Ease of Use Priority: Standardized M4 mounting holes and plug-and-play terminal design to minimize system integration complexity.
6. Application Scenarios
- Rail Transportation: EMU traction converters, metro braking energy recovery systems.
- New Energy: PV inverter MPPT monitoring, battery balancing in energy storage systems.
- Industrial Automation: Servo motor drive protection, frequency converter harmonic analysis.
- Special Power Supplies: Thyristor trigger monitoring in HVDC transmission.
7. Unique Advantages
- Zero-Flux Compensation Technology: Eliminates residual magnetism for truly zero-error output.
- Strong Interference Resistance: Differential output mode suppresses common-mode noise up to 80dB.
- Wide Dynamic Range: Supports accurate measurement from 10Hz low frequency to 100kHz high frequency.
- Pre-Calibrated Output: Factory-calibrated with temperature compensation, eliminating on-site recalibration.
8. Must-Know for Engineers
- Key Parameter Matching: Ensure IPN ≥ 1.2x system max current, BW > 5x signal highest frequency.
- Thermal Design Consideration: Secondary side power dissipation P=I²R=(800mA)²x70Ω≈44.8W, requiring forced air cooling.
- Installation Guidelines: Main conductor must pass vertically through the sensor center, with deviation error < ±3mm.
- Certification Compliance: Additional RC absorption circuit required to meet IEC 61000-4-4 electrical fast transient test.
- Lifetime Prediction: Under 8-hour full-load daily operation, typical service life exceeds 15 years.
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Contact:
Sylvia Xu | ECSource Components Co.,Limited
Top 10 Test Laboratory Distributors in Asia.
D-U-N-S Number:655918890 | ISO90001 Certificated Company
Phone/Whatsapp: 0086-19806586673
Email:sylvia@ecsource.net
Line Card : FPGA, RF, MEMORY,CONNECTOR,Power
