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LTspice simulation of Two transistor forward wont run..."singular matrix" error

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treez

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Hi,

Do you know why this LTspice sim of a two transistor forward wont run? The error message says “singular matrix node N029”.
 

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  • two tran forward LTC3705 LTC3706.txt
    13.5 KB · Views: 9

wwfeldman

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i'm not used to reviewing spice through the netlist
after searching your schematic symbols, i found no symbol for ground
spice requires a reference - there must be a ground symbol somewhere.

can you post the schematic?
 
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treez

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Thanks yes, please find the schem...also, the .txt in the top post, if converted to .asc , will give the schem if opened in LTspice
 

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  • two tran forward LTC3705 LTC370.pdf
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dick_freebird

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Signal "SG" seems to go nowhere and the way Linear
Tech makes macromodels, this might be a node with
nothing but code attached?
 
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wwfeldman

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resistor R22 is 100r
i'm surprised spice didn't flag a syntax error
suggest you remove the r
 
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treez

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Thanks, ive got a little farther now, but not much further...still no 24v, 100w
The R22 is 100R and i feel will it be ok like that since its only a snubber resistor
 

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  • two tran forward LTC3705 LTC3706_2.TXT
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Akanimo

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Hi,
Maybe you should look at the command "K L1 L2 1". Maybe you'd need to change the K to K2.
 

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treez

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Thanks, as long as the K's all have different numbers than its OK.
 

Akanimo

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Check your connection of D6 and C10 to Boost and Ts pins of 3705. You've made a mistake there. The diode should be connected to the boost pin while the cap should be across the two pins mentioned.
 
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treez

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Thanks yes, that was picked up and the re-hash is in #6 above...though it still doesnt work
 

Akanimo

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Please post your updated schematic.
 

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