In demanding power electronics applications such as variable frequency drives, UPS, and renewable energy, accurate current sensing is the cornerstone of system stability and efficiency. The LT505-S/SP32, a high-performance closed-loop Hall-effect current sensor from LEM Group, is specifically designed for demanding industrial applications. With its outstanding performance parameters and exceptional reliability, this model has become the preferred solution in industrial equipment worldwide.
High-speed transient capture with ultra-low distortion – Featuring a fast response time of approximately 1 µs and a wide frequency bandwidth from DC to 150 kHz, the sensor tracks current transients almost instantaneously and reproduces the true waveform with negligible delay, enabling the control system to react in milliseconds.
Superior accuracy and long-term stability beyond traditional open-loop sensors – The closed-loop magnetic compensation structure delivers an ultra-low linearity error of ±0.1% and high accuracy of ±0.6%, effectively eliminating the drift and susceptibility to external electromagnetic interference common in open-loop sensors.
Robust, passive safety isolation – The sensor provides reinforced isolation between the primary (power) and secondary (control) circuits. This high safety level protects sensitive control electronics from high-voltage spikes or surges, while also enhancing system resilience against lightning strikes and other overvoltage events.
Excellent EMI immunity and natural heat dissipation – The LT505-S/SP32 outputs a current signal (±100 mA). Compared to voltage output types, the current loop offers strong immunity to ambient noise over long cable runs. Moreover, the closedloop technology introduces virtually no insertion loss, greatly simplifying thermal design and reducing system power consumption.
|
Parameter |
Value / Description |
|
Brand |
LEM |
|
Rated measuring current (Ipn) |
500 A |
|
Maximum measurable range (Ip) |
±1200 A |
|
Output signal |
±100 mA (current output) |
|
Supply voltage |
±15 V to ±24 V DC, widerange bipolar supply |
|
Accuracy |
±0.6 % (high precision) |
|
Linearity error |
±0.1 % (excellent linearity) |
|
Response time |
< 1 µs (microsecond response) |
|
Bandwidth (-3 dB) |
DC ~ 150 kHz |
|
Operating temperature range |
-10 °C to +85 °C (suitable for harsh environments) |
|
Insulation |
Plastic case meets UL 94-V0 flame retardancy |
|
Mounting |
Panel mount with a large aperture (40.5 x 40.5 mm) for primary conductor |
|
SP32 designation |
Represents a specific internal configuration or factory preset by LEM, ensuring universal compatibility |
The LT505-S/SP32 is not only a reliable choice for design engineers but also a proven solution for solving field application challenges. It is widely used in:
AC and DC variable speed drives and servo motor drives
Uninterruptible power supplies (UPS) and switchedmode power supplies (SMPS) – for active input current sensing and feedback loops
Bidirectional DC-DC converters and photovoltaic inverters in renewable energy systems
Battery-powered equipment, charging stations, and static converters in DC motor drives
High-power industrial welding machine power supplies
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