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Isolated Voltage Sampling Amplifier With High Reliability
NSi1311 is a high-performance isolation amplifier. It is developed based on NOVOSENSE capacitance isolation technology, in which the output is separated from the input. The component is designed with a single-ended input signal range of 0.02V to 2V. The high input impedance of the NSi1311 makes it ideal for connection to high voltage resistive dividers or other voltage signal sources with high output impedance. The fixed gain of the component is 1, and differential analog input is made available as well. Low misalignment and gain drift ensure accuracy over the entire temperature range. High common mode transient immunity (CMTI) ensures that the component can provide accurate and reliable measurement results even when working with high power switches, such as in motor control applications. The fail-safe function (high-side supply voltage loss detection) simplifies the design and diagnostics of the system.
Product Features
• Up to 5000Vrms insulation voltage
• Linear supply voltage range of 0.02 to 2V
• Fixed gain: 1
• Low offset error and temperature drift：±1.5mV(Max), -5 to 30μV/ °C(Max)
• Low gain error and temperature drift：±0.3%(Max), ±45ppm/ °C(Max)
Low non-linearity and temperature drift：±0.04%(Max), ±1ppm/℃(Typ)
SNR: 82dB(Typ, BW=10kHz), 70dB(Typ, BW=100kHz)
• Bandwidth: 400kHz(Typ)
• High CMTI: 150kV/us(Typ)
• System-level diagnostic functions:
• VDD1 monitoring
• Operation temperature: -40°C to 125°C
• RoHS compliant package:
• SOP8(300mil)
Safety Certificate
• UL1577 qualified: 5kVrms for 1 min.
• CQC qualified: Conform to GB4943.1 -2011
• CSA qualified: Components conform to 5A
• VDE qualified: DIN V VDE V 0884-11:2017-1
Application
• Bus voltage monitoring
• AC motor control
• Power and PV inverters
• UPS
• Onboard charger
Functional Block Diagram
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