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Isolated Current Sampling Amplifier With High Reliability
NSI1400D 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 8.2 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 of 8.2
• Excellent DC Performance:
• Offset Error: ±0.5mV (Max)
• Offset Error Drift: ±4μV/℃ (Max)
• Gain Error: ±0.3% (Max)
• Gain Error Drift: ±30ppm/℃ (Max)
• Nonlinearity: ±0.05% (Max)
• Nonlinearity Drift: ±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), SOP8(150mil)
Safety Certificate
• UL recognition:
• SOW8: 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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