AMC1400: Quiescent current for IC in loop power application

Rohit6230

Part Number: AMC1400
Other Parts Discussed in Thread: DAC161S997, AMC1300, AMC1200, AMC1100

Hi,

We are designing an isolated loop power 4–20 mA transmitter using the DAC161S997 IC. and I want to Monitor 4–20 mA of current output by adding 10E ohm shunt in between loop outputs to measure whether the given current output is OK or Not. For that, I am planning to use an AMC1400 isolated amplifier. Please let me know the quiescent current for the AMC1400 or other isolated amplified devices available in the TI store for the monitoring loop current.

11 months ago

0 Alexander Smith 11 months ago

TI__Mastermind 48871 points

Hi Rohit,

There is no issue with this configuration.

What is the isolation voltage that your application is considering? The AMC1400 is our highest rated isolated device, reinforced with 14mm creepage/clearance. We have devices with the same signal chain in smaller packages and lower isolation ratings such as AMC1300B.

The power consumption of the device can be found in the power supply section of the electrical characteristics table. These devices do not have quiescent current as normal amplifiers do.

This collateral overview may help: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1164993/faq-isolated-data-converter-collateral-overview

0 Rohit6230 11 months ago in reply to Alexander Smith

Intellectual 725 points

Thanks Alexander for reply.

I want to take feedback of 4-20mA current output from same transmitter design and identify the fault condition if occure. I have current limit in whole designing <3 mA because this is 2 wire loop power transmitter.

0 Rohit6230 11 months ago in reply to Alexander Smith

Intellectual 725 points

Please confirm me IDD1 and IDD2 is continues power consumption of AMC1300 ?

0 Alexander Smith 11 months ago in reply to Rohit6230

TI__Mastermind 48871 points

Hi Rohit,

Yes, IDD1 and IDD2 is the continuous power consumption of the device.

These devices are meant for high voltage applications where isolation to protect humans or other circuitry is necessary. Is there a large difference in voltage potential between the 4-20mA and your controller?

0 Rohit6230 11 months ago in reply to Alexander Smith

Intellectual 725 points

Voltage potential 0.4 Volt to 2.0Volt only but we have isolated 4-20mA current output section from microcontroller so that while taking feedback of same loop we are thinking to used isolator.

+1 Alexander Smith 11 months ago in reply to Rohit6230

TI__Mastermind 48871 points

Hi Rohit,

In this case, a device such as AMC1100 or AMC1200 should be sufficient.

AMC1400 is meant for up to 10kV+ transient voltages!

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AMC1400: Quiescent current for IC in loop power application