Ideal Boost Converter Simulation Fail in LTSpice

Thread Starter

CineDroid

Joined Jan 25, 2020
20
Hi all,

on my journey to try and create my 12 to 24V boost converter from scratch I've followed these equations (http://www.ti.com/lit/an/slva372c/slva372c.pdf) to come up with the circuit attached and as you can see it doesn't really boost anything (+11.16V relative to ground)

In Falstad I seem to get an oscillating voltage between +20V and +11V.

I feel like there's something basic I'm not getting and any help would be helpful to get a better start at this.
 

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ericgibbs

Joined Jan 29, 2010
10,516
hi CD,
Use a MOSFET capable of switching ON 'hard' with a 5V Gate voltage.
This circuit works, but it is not optimised for best performance, but it should help in your design.
E
 

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Thread Starter

CineDroid

Joined Jan 25, 2020
20
V1 Von=5V which is a little small for most MOSFETs. Change to Von=10V
I changed to a real MOSFET. (pick anyone from the list, 50V)
Thanks, I read in another thread that LTSpice can have unexpected behavior on default components. And Thanks @ericgibbs, makes sense. Also thanks @Bordodynov, still learning the commands with LTspice but your curves make much more sense.

@ronsimpson, your note about ground connection pushed me to experiment in Falstad and I have a question I'll be posting in a new thread.
 
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