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Re: Initial conditions for inductor current in .TRAN UIC analysis - follow up

 

On Mon, Feb 24, 2025 at 06:30 AM, Andy I wrote:
Specifying initial conditions (either IC= or .IC) works differently depending on whether UIC is also used.? Without UIC, SPICE applies the initial conditions, lets the circuit converge, then it might remove the enforcing conditions and lets it converge again.? Therefore, whether or not it does the second step, it starts with a self-consistent set of voltages and currents.? Whereas, when you add UIC, SPICE omits trying to converge.? It just accepts the initial conditions you specify (including 0 for any not specified), and accepts them as is.? ?No attempt to solve the network equations with those conditions.
Sorry, without UIC LTspice lets the circuit converge (i.e. basically it works out the DC Initial Transient Solution/ITS including the voltages/charges and currents/fluxes for capacitors and inductors respectively to use as their actual initial conditions to start the transient from). What do you mean by
... then it might remove the enforcing conditions and lets it converge again
? Thanks.
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