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I have made a simple buck converter in orcad pspice. Its a 12V/1.2V 12A buck
It has been designed with ideal considerations. I want to sense the inductor current, so i have employed the inductor DCR current sensing scheme with a RC network in parallel to the inductor.by matching the time constants L/R and RC the voltage drop across the inductor DCR is same as the capacitor voltage drop.
so to sense this current i connected a current sense amplifier MAX4372F with a 50V gain.
The problems that i face are
1) when i try to tap the voltage across the capacitor it does not maintain the same drop as the DCR
2) Also the MAX4372F does not give a constant output for different values of output resistance, it keeps on changing for different resistors
It has been designed with ideal considerations. I want to sense the inductor current, so i have employed the inductor DCR current sensing scheme with a RC network in parallel to the inductor.by matching the time constants L/R and RC the voltage drop across the inductor DCR is same as the capacitor voltage drop.
so to sense this current i connected a current sense amplifier MAX4372F with a 50V gain.
The problems that i face are
1) when i try to tap the voltage across the capacitor it does not maintain the same drop as the DCR
2) Also the MAX4372F does not give a constant output for different values of output resistance, it keeps on changing for different resistors
