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Hello,
I want to implement a current limiter with a shunt and lm393 comparator, so i draw a simple circuit , but it seems that proteus wont do any switching, is treating the lm393 as a liniar output, and makeing the FET act as an resistor instead of a switch. As lm393 only do two states, 0V and +Vcc and have a response time of ~1.3us, proteus should see a switching voltage in the range of a few Mhz. So i see on proteus oscilloscope a steady voltage on gate. Tried also the logic analyzer, and a dc sweep, all see a steady voltage instead of pulsing witch should it be.. or Not ??? why this behaviour?
I want to implement a current limiter with a shunt and lm393 comparator, so i draw a simple circuit , but it seems that proteus wont do any switching, is treating the lm393 as a liniar output, and makeing the FET act as an resistor instead of a switch. As lm393 only do two states, 0V and +Vcc and have a response time of ~1.3us, proteus should see a switching voltage in the range of a few Mhz. So i see on proteus oscilloscope a steady voltage on gate. Tried also the logic analyzer, and a dc sweep, all see a steady voltage instead of pulsing witch should it be.. or Not ??? why this behaviour?
