I am designing a buck regulator LED power supply in LTspice. I'm trying to add an optocoupler on/off switch to it (which will be an option.) When the opto is ON, the output should be OFF (which is controlled by turning off the standby supply reducing consumption to a few microamps), and vice-versa. However, LTspice is giving me odd errors:
Does anyone know what's wrong?WARNING: Node N012 is floating.
WARNING: Less than two connections to node NC_01. This node is used by S:U4:1.
Singular matrix: Check node q5#collector
Iteration No. 2
Fatal Error: Singular matrix: check node q5#collector
Iteration No. 2
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