Deal All,
I've a problem with LT Spice simulation of AD8210 (model downloaded from Analog website).
I need to measure load current from 0 to 20A. For this purpose, I've designed a circuit with a 4mohm Rsense and REF1, REF2 pins connected to GND for unidirectional operation with groun referenced output.
From simulation rresults that when the output current is 0A, the output monitor is 50mV (according to offset reported in datasheet), but when the output current is 1A, the output monitor is still 50mV.
The output monitor starts to move (from 50mV to 54mV) whit 1.1A output current.
With 20A the monitor is 1.57V.
My questions are:
- why the output monitor voltage remains at 50mV with 1A of output current?
- why with 20A the output monitor voltage is not: 20A x 4mohm x 20V/V = 1.6V?
This can be due to low value of Rsense (4mohm)?
Attached the circuit simulated and plot results
Thanks in advance for your reply and support.
Kind Regards
Stefano
