LM5175: Data sheet circuit 4 does not converge

Saved wrong version.  FETs gates are shorted and other issues.  Will repost.

I think the files are correct and the .PNG is wrong.

Hi Pete,

we will look into this and come back till mid of next week.

Best regards,

 Stefan

"C:\cds_spb_home\cdssetup\projects\PETE LM5175 011525\PETE LM5175 011525.opj"

I am trying to design a 24V large capacitance 100ma charger.  I did one and successfully modeled it in Analog Devices Spice.  We want to take advantage of the synchronous regulation to reduce the difference that a diode rectified circuit has.  The low current requirement is why the sense resistor and inductor are so large.  I ran the AD feedback loop not with voltage sense but with average current sensed off the sense resistor.  Is there a more stable actual FET we could use?  The AD sim used a MAX51597 with an IRFZ44N and sims ran quickly.  We are fabricating that in case I cannot demonstrate this using actual FET models and not voltage-controlled switches.  The large capacitance shares with a low current PS and allows very high, infrequent large pulse loads.  It is a retrofit option for the customer's existing system.

My model suffers from convergence problems.

Print 012025.pdf