I'm trying to simulate high side shunt resistor current measurement using LT6015 op amp, but the simulation doesn't work I'm always having the same output even if I change the current. Can somebody tell me why?
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2\$\begingroup\$ Hi, ZACK. Welcome to EE.SE. You will get more attention and better responses if you write with proper capitalisation and punctuation. See Write to the best of your ability. \$\endgroup\$– TransistorCommented May 15, 2023 at 18:43
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\$\begingroup\$ Yes, you are correct. It looked like the voltage shown on the schematic on the other side of the shunt was 0.00000002 V, but it's actually 8.80000002, which I saw more clearly when I enlarged the image. I'll delete my comment. \$\endgroup\$– PStechPaulCommented May 16, 2023 at 4:28
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2 Answers
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You have two problems. As Spehro notes, the 3.3V power supply is connected backwards. You will also clip the output with a 0.2V input. Either change the gain, the current sense resistor, or the 3.3V power supply to 5V.
If you simulate your circuit with a sine wave input, you can see the part saturating.
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You've reversed the power supply connections on the LT6015. You've burned out the chip. Delete it and download a new one.
answered May 15, 2023 at 19:10
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2\$\begingroup\$ The V+ to V- absolute max rating is 60V, -50V. No virtual smoke. \$\endgroup\$– qrkCommented May 15, 2023 at 20:03
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2\$\begingroup\$ It would be fun to write a script or add-on to LTspice to detect destructive conditions and display a GIF of an actual fire or explosion. :) \$\endgroup\$ Commented May 15, 2023 at 20:12
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\$\begingroup\$ thankss i was doubting about that \$\endgroup\$– ZACKCommented May 16, 2023 at 8:18