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measuring current using instrumentation amplifier

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gehan_s

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hey all, this is my first post in this forum.

i want to measure load current using a instrumentation amplifier (for a power supply). i was planing to put a 1 ohm resistor in series with the load and measure the voltage difference using the in-amp (AD623) but the voltages at the 2 input pins exceed 20V which i think is not good for it. how can i overcome this and is there a better solution (which should be low cost) ?????

thanks in advance
 

thank you verymuch for the reply

the maximum DIFFERENCE voltage will be 1V (since my maximum load current will be 1A) but the maximum O/P voltage will be about 40V. for an example when the load is drawing 500mA at 35V, the in-amp's + and - pins will be at 35.5V and 35V
 

These are lots of inamps able to handle common-mode voltage much higher than VDD,
for example AD628 can withstand ±120 V at VSupply = ±15 V.
 
There are "tons" of high side current sense amplifiers available from major manufacturers, with voltage ranges up to 100V or so.
 
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