LT8312 LTspice sim giving "singular matrix error"

F

Flyback

Well-Known Member

• Jun 18, 2020

• #1

Hi,
The attached sim is giving "singular matrix" error at certain node numbers.
Do you know how one can find out which node is which?

 

Attachments

• BCM Boost PFC _LT8312 _simple.asc

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alec_t

Well-Known Member

Most Helpful Member

• Jun 18, 2020

• #2

I got the dreaded "time step" error, not the "singular matrix" one. I added a few pF of parallel capacitance to L1 and L2 and the sim ran ok. Loks like you've got about 100V ripple at 100Hz on the output.

 

S

simonbramble

Active Member

• Jun 28, 2020

• #3

From Simulate -> Edit Simulation Command... if you remove Time to Start Saving Data (just delete the 0) and untick Skip Initial Operating Point... it works perfectly

 

F

Flyback

Well-Known Member

• Jun 28, 2020

• #4

Thanks very much SimonBramble, Brilliant! got it going...just needed to change low feedback div res too...woops