LM339 Hysteresis in LT Spice

bertus

Joined Apr 5, 2008
20,059
Hello,

The problem is that the Vref is a hard reference.
Making the reference with two equal resistors, the reference (like 2 X 10K) will be soft and change with the output voltage.
R3 will be larger as in the given schematic.

Bertus
 

ericgibbs

Joined Jan 29, 2010
8,744
hi rudy,
One problem on your sim is that the Vref and Vsrc have zero resistance, so the hysteresis cannot be applied to the comp.
Post your asc file and I will modify it.
E
 
Top