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about ina226 and amc1400 in high-pressure system

long zheng
Prodigy 30 points
Other Parts Discussed in Thread: INA226, AMC1400

我需要检测电流，使用了75MV分流器，INA226可以精确的测量，然后通过隔离I2C传输。但是系统上了1500V，我想知道AMC1400是否适用？AMC1400范围250MV，在75MV上，前级输入误差会不会太大。哪种方案更好？是否有75MV的隔离放大器？

  • 0
    Prodigy 30 points

    I need to detect the current, using a 75MV shunt, INA226 can accurately measure it and transmit it through isolation I2C. But the system is running at 1500V, I would like to know if AMC1400 is applicable? Will the input error of the front stage be too large on the AMC1400 range of 250MV and 75MV. Which solution is better? Is there a 75MV isolation amplifier available?

  • 0 in reply to long zheng
    TI__Expert 5275 points

    Hi Long,

    Using 75 mV with the AMC1400 will produce a 0.52% error versus a 0.43% error using the recommended 250 mV. Please see the tables from our current sensing calculator below. Depending on your accuracy goals, a 0.09% increase in error could be usable. 

    Considering solution options, you could use the AMC1400 on its own but not in combination with INA226. The INA226 supplies I2C output while the AMC1400 uses differential input. If you want to use the INA226 for current sensing, you could use a digital isolator with it instead. 

    Best regards,

    Eva