It was absolutely beneficial to be able to simulate the design LTSpice predicted an efficiency of over 90% from 10mA (step 1) to 40mA (step 4)! That one was a bit optimistic as you will see later!Īnother interesting piece of information picked up from the simulation is predicting the voltage spikes at the drain of the transistor.
For instance that’s how I detected that the 22 Ohm snubber can’t be a typical 1/10W 0603 resistor. That being said, it is interesting to use because you can predict the sizing and power dissipation of components pretty accurately. On one end it’s a powerful tool on the other end its user experience from Windows 3.1 era could not be more frustrating to work with. I have a love/hate relationship with LTSpice. So simulation is the next logical step in the design phase:
The good thing about working with Linear products is that they are incredibly easy to simulate since they provide all the models on LTSpice. I just made sure the duty cycle would be OK with this new ratio and changed the feedback resistors but other than that: it is stock “typical application”. I even copied the weird double diode that they used because I wanted first and foremost to have a working prototype before doing further changes. The first revision of the Nixie power supply Why reinvent the wheel when it’s been done before and by people that have a full time job in the field? So I took the 350V example from Linear, and adapted it to output the proper 170V Nixie voltage. When it comes to design I trust the engineers from big semiconductors company.
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