As AGa stated, you use Ohm's law.can you explain only formulas, how they are derived?.
Vpwhich value (of V+) to be used in the 2nd equation (which is in 1st post), either the V+ value is Vc or Vp
I think from Rp only.Hi,
If the Rp is omitted for a Open Collector output, where is positive hysteresis feedback current coming from to drive R2.???
E
Thank you for the simulation.Update:
If it helps, post the threshold and hysteresis component values, using your calculated values, and I will run a simulation.
Can you give me the clarity that do I need to use the Rp for the derivation in this context?.As I suggested, calculate and post actual component values for a Comp using the equations you have derived in post #9, and I will use those values and run a LTS simulation.
This will prove/disprove your Equ's.
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You need to consider Rp, since current flows through it to R2 when the output is high, which causes a voltage drop through Rp.Can you give me the clarity that do I need to use the Rp for the derivation in this context?.
Can you verify that, Is the derivation is right?. If not, please let me know where I did the mistake.You need to consider Rp, since current flows through it to R2 when the output is high, which causes a voltage drop through Rp.
Typically Rp is selected to be a much lower value than R2, so the voltage drop is low.
As you requested, I have placed all component values into the equations and the results are as follows:hi pp,
I have changed the Node labels to match your equations.
All you need to do is plug the actual component values into those equations and see if the results match close to the simulation plots.
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View attachment 256404View attachment 256406
by Jake Hertz
by Jake Hertz
by Jeff Child