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Isolated Current Sampling Amplifier With High Reliability

NSI1200C is a high-performance isolated amplifier with output separated from input based on the NOVOSENSE capacitive isolation technology. The device has a linear differential input signal range of ±250mV (±320mV full-scale). The differential input is ideally suited to shunt resistor-based current sensing in high voltage applications where isolation is required. The device has a fixed gain of 8.0 and provides a differential analog output. The low offset and gain drift ensure the accuracy over the entire temperature range. High common-mode transient immunity ensures that the device is able to provide accurate and reliable measurements even in the presence of high-power switching such as in motor control applications. The fail-safe functions including input common-mode overvoltage detection and missing VDD1 detection simplify system-level design and diagnostics.

Product Features

• Up to 5000Vrms Insulation voltage

• ±250mV linear Input Voltage Range

• Fixed Gain: 8.0

• Low Offset Error and Drift: ±0.5mV (Max), ±5μV/℃ (Max)

• Low Gain Error and Drift: ±0.3% (Max), ±30ppm/℃ (Max)

• Low Nonlinearity and Drift: ±0.05% (Max), ±1ppm/℃ (Typ)

• SNR: 72dB (Typ, BW=100kHz)

• Wide bandwidth: 220kHz (Typ)

• High CMTI: 125kV/μs (Typ)

• System-Level Diagnostic Features:

      • VDD1 monitoring

      • Input common-mode overvoltage detection

• Operation Temperature: -40℃ ~125℃

• RoHS-Compliant Packages: SOP8(300mil), DUB8

Safety Certificate

• UL recognition: 

      • SOW8, DUB8:  5000Vrms for 1 minute per UL1577

      • SOP8: 3000Vrms for 1 minute per UL1577

• CQC certification per GB4943.1

• CSA component notice 5A 

• DIN EN IEC 60747-17 (VDE 0884-17)


Application

• Shunt current monitoring

• Motor Drives

• Uninterruptible Power Suppliers

• Solar Inverters

Functional Block Diagram

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For more product information, please contact us.