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Dear asdf44,
I am controlling the current with an op amp (TLC277) and a current sense resistor. This op amp switches the mosfet which is on low side current path.
How can I analyze/decide whether my loop has marginal stability or not?
The problem is;
If you look at the circuits above, there is no control at the positive channel. It directly supplies the voltage to the body.
And after the negative electrode, there is a current sense resistor, which is 32.4 ohms.
Assume that the user set the current level 10mA from Graphical...
Barry and FvM,
First of all, thanks for your responses.
Ok. I may misundersttod an article. I remember that the article says that the body impedance changes between 100k and 1M ohms.
But I just measured the resistance, its about 13k ohms. I measured this value with a stick electrode. This may...
Hi Barry,
I know math. But this is a different case. I connect this device more than 5 times with current design.
But there is low side control to adjust the current (for the current design, there is an OP-AMP to adjust current. I attached the related schematics).
Low side control causes...
Dear Member,
I am trying to design a current source for a medical device. The load is unknown but in megaohms range (body impedance).
I have 200V voltage source. I generate this 200V with royer topology. The current range is between 0-50mA.
The waveform shape is pulse...
The current can be set...
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