Monday, 6 April 2015

CircuitLab simulation of 555 timer - OUT HIGH always delivering 5V irrespective of Vcc?


I've scratched together a design for a 555 timer based driver for an IR540 MOSFET. But in CircuitLab the simulator shows the 555's OUT voltage is always 5V when high, for Vcc ranges 3.3V through 24V. That doesn't make much sense to me.


schematic


simulate this circuit – Schematic created using CircuitLab


Does anyone know what the actual part for the 555 modeled by CircuitLab is? I've read that some 555s do have clamped output voltage, but most deliver Vcc - ~ 1.7V.


Is the modelling weird or am I just doing something dumb?


Crosslink: CircuitLab forum post


Related prior question




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