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The circuit achieves stable current above 0.7 V Vbat in a PSpice simulation, also stable transient response (with and without the below shown compensation circuit).
Sajjadkhan, I simply don't understand your comments in post #17 and #19. They sound misterious to me, because you describe the restrictions related to Vth correctly in post #13.
I'll show the intended compensation circuit for completeness, but it's apparently not required with LM324/IRF520.
Sajjadkhan, I simply don't understand your comments in post #17 and #19. They sound misterious to me, because you describe the restrictions related to Vth correctly in post #13.
I'll show the intended compensation circuit for completeness, but it's apparently not required with LM324/IRF520.