After starting and stopping on this for awhile (and getting over various learning curves), I think I've adapted a workable LTSpice simulation for an LM2907.
Over a year ago, I stumbled across a model for an LM2907 that Russ Kincaid of Kincaid Engineering had created and posted on a website somewhere, which is now long gone. Mr. Kincaid has apparently retired, and hasn't been heard from in awhile (anywhere that I can find, that is).
I took his .subckt LM2907, renamed it LM2907A, and used a 2N3904 for the NPN and 2N3906 for the PNP transistors he was using.
If the input frequency is higher than the circuit is configured for, you will have strange results. LM2907A test.asc max input frequency is about 900Hz.
The LM2907A.zip file contains:
LM2907A.sub - put in \Program Files\LTC\SwitcherCad\lib\sub
LM2907A.sym - put in \Program Files\LTC\SwitcherCad\lib\sym
LM2907A test.asc - put in \Program Files\LTC\SwitcherCad
The image file is Mr. Kincaids' concept of the "guts" of the LM2907.
Review the notes in LM2907A.sub
I don't have any of the LM2907/LM2917/LM2907-8/LM2917-8 IC's, so have nothing to compare them to except the formulas in the datasheet.
However, if this turns out to be a reasonable simulation, it could be helpful for a number of folks that are trying to use this IC.
Over a year ago, I stumbled across a model for an LM2907 that Russ Kincaid of Kincaid Engineering had created and posted on a website somewhere, which is now long gone. Mr. Kincaid has apparently retired, and hasn't been heard from in awhile (anywhere that I can find, that is).
I took his .subckt LM2907, renamed it LM2907A, and used a 2N3904 for the NPN and 2N3906 for the PNP transistors he was using.
If the input frequency is higher than the circuit is configured for, you will have strange results. LM2907A test.asc max input frequency is about 900Hz.
The LM2907A.zip file contains:
LM2907A.sub - put in \Program Files\LTC\SwitcherCad\lib\sub
LM2907A.sym - put in \Program Files\LTC\SwitcherCad\lib\sym
LM2907A test.asc - put in \Program Files\LTC\SwitcherCad
The image file is Mr. Kincaids' concept of the "guts" of the LM2907.
Review the notes in LM2907A.sub
I don't have any of the LM2907/LM2917/LM2907-8/LM2917-8 IC's, so have nothing to compare them to except the formulas in the datasheet.
However, if this turns out to be a reasonable simulation, it could be helpful for a number of folks that are trying to use this IC.
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