LTSpice Error Massage: time step too small

Show us your circuit! Post the .asc file, if it's not too big. This kind of error usually indicates there's something dodgy in your circuit; something that's likely not to work in a real circuit either.

Jeroen Belleman

Hello,

here is my *,asc file

Version 4 SHEET 1 2236 680 WIRE 240 -720 64 -720 WIRE 336 -720 240 -720 WIRE 560 -720 336 -720 WIRE 640 -720 560 -720 WIRE 800 -720 640 -720 WIRE 832 -720 800 -720 WIRE 960 -720 928 -720 WIRE 1008 -720 960 -720 WIRE 1056 -720 1008 -720 WIRE 1168 -720 1136 -720 WIRE 1472 -720 1168 -720 WIRE 1584 -720 1472 -720 WIRE 1856 -720 1584 -720 WIRE 1952 -720 1856 -720 WIRE 1472 -704 1472 -720 WIRE 1856 -704 1856 -720 WIRE 640 -688 640 -720 WIRE 800 -688 800 -720 WIRE -288 -656 -288 -672 WIRE -176 -656 -176 -672 WIRE -64 -656 -64 -672 WIRE 64 -656 64 -720 WIRE 1584 -656 1584 -720 WIRE 240 -640 240 -720 WIRE 1952 -640 1952 -720 WIRE 1008 -624 1008 -720 WIRE 1168 -624 1168 -720 WIRE 1520 -608 1472 -608 WIRE 640 -592 640 -608 WIRE 800 -592 800 -624 WIRE 800 -592 640 -592 WIRE 848 -592 848 -672 WIRE 848 -592 800 -592 WIRE 1856 -592 1856 -624 WIRE 1856 -592 1808 -592 WIRE 1856 -560 1856 -592 WIRE -288 -544 -288 -576 WIRE -176 -544 -176 -576 WIRE -64 -544 -64 -576 WIRE 1584 -544 1584 -560 WIRE 560 -528 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SYMATTR Value 8.2n SYMBOL voltage -176 -672 R0 SYMATTR InstName V1 SYMATTR Value -5 SYMBOL voltage -64 -672 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL Opamps\\\\LT074 -368 -80 M180 SYMATTR InstName U1 SYMBOL res -96 -160 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 680 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL cap -96 -112 R0 SYMATTR InstName C2 SYMATTR Value 8.2n SYMBOL voltage -288 -672 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 2.0 SYMBOL Opamps\\\\LM393 112 -192 R0 SYMATTR InstName U2 SYMBOL npn 272 -176 R0 SYMATTR InstName Q1 SYMATTR Value QBC546B SYMBOL res 224 -320 R0 SYMATTR InstName R6 SYMATTR Value 4.7k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 320 -400 R0 SYMATTR InstName R7 SYMATTR Value 10k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL pnp 496 -80 M180 SYMATTR InstName Q2 SYMATTR Value QBCP53-16 SYMBOL npn 496 -528 R0 SYMATTR InstName Q3 SYMATTR Value QBCP56-16 SYMBOL cap 224 -640 R0 SYMATTR InstName 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0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R12 SYMATTR Value 100 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 864 32 M0 SYMATTR InstName R13 SYMATTR Value 1k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL cap 1200 32 M90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C5 SYMATTR Value 100n SYMBOL res 1472 192 M90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R14 SYMATTR Value 47k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1840 -720 R0 SYMATTR InstName R15 SYMATTR Value 8.2k SYMBOL res 1840 -576 R0 SYMATTR InstName R16 SYMATTR Value 1k SYMBOL cap 1152 -624 R0 SYMATTR InstName C7 SYMATTR Value 470µ SYMATTR SpiceLine Rser=0.07 SYMBOL ind 1008 208 R90 WINDOW 0 5 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName L2 SYMATTR Value 10µ SYMBOL res 1568 -560 R0 SYMATTR InstName R17 SYMATTR Value 1.8 SYMATTR SpiceLine tol=10 pwr=2 SYMBOL npn 1520 -656 R0 SYMATTR InstName Q4 SYMATTR Value Qbux85 SYMBOL npn 1408 -704 R0 SYMATTR InstName Q5 SYMATTR Value BC546B SYMBOL res 1776 -480 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R18 SYMATTR Value 0.05 SYMBOL Opamps\\\\LM324 1184 -240 R0 SYMATTR InstName U5 SYMBOL res 1232 -192 M90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R19 SYMATTR Value 1.3k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1328 -368 R0 SYMATTR InstName R20 SYMATTR Value 1.5k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1216 -320 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R21 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1088 -208 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R22 SYMATTR Value 91k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL Opamps\\\\LT074 928 -256 R0 SYMATTR InstName U6 SYMBOL res 960 -336 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R23 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 832 -224 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R24 SYMATTR Value 10k SYMATTR SpiceLine tol=5 pwr=0.25 TEXT -176 -312 Left 0 !.tran 0 100ms 0s 5ms startup

I am using some components which I had to add to the library. I hope that is no problem. Otherwise I have to include the models to the *.asc file.

Best regards Sven

-- Message posted using

Look for a reason why the circuit might want to oscillate at some insanely high frequency. This sort of thing tends to happen when you have inadvertantly created an unstable numerical problem for the solver. It tries its best and repeatedly decreases the time step to try and get an accurate solution until it gives up.

Regards, Martin Brown

Hello,

thank you very much. I will try to change the circuit a little bit.

Sven

-- Message posted using

Oh dear! A switching power supply. Debugging those is *work*, of which I have quite enough, thank you.

I've spent a few minutes trying to simulate the thing, after having whimsically substituted LT1018s for the comparators, NPN, PNP and PMOS generics for the transistors I don't have the models for (i.e., all of them), and fixing the values of some caps and the coils, which seemed garbled.

I don't see what the circuitry involving Q4 and Q5 with the amplifiers driving them is for either.

The simulation runs without the error you described, but the circuit doesn't work. I'd say, try to increase the PMOS gate series resistor to 50 Ohms and/or insert resistors in the collector leads of the driver transistors. A few tens of ohms might do it.

I'm sorry but I can't afford to put in the time required to go any further.

Jeroen Belleman

Start off with working subsections, made up of known-good model parts.

Incrementally introduce the unproven part models. The circuit can function with part models presently in the release, though you should not expect stability, as drawn.

The circuit controlling current in R17 cannot work, as drawn.

The release of LTSpice that I ran your circuit in did not display your cap and inductor 'u' symbols correctly. It also had trouble with some unidentified symbols. retro'd asc file follows.

RL ............................

Version 4 SHEET 1 2236 680 WIRE 240 -720 64 -720 WIRE 336 -720 240 -720 WIRE 560 -720 336 -720 WIRE 640 -720 560 -720 WIRE 800 -720 640 -720 WIRE 832 -720 800 -720 WIRE 960 -720 928 -720 WIRE 1008 -720 960 -720 WIRE 1056 -720 1008 -720 WIRE 1168 -720 1136 -720 WIRE 1472 -720 1168 -720 WIRE 1584 -720 1472 -720 WIRE 1856 -720 1584 -720 WIRE 1952 -720 1856 -720 WIRE 1472 -704 1472 -720 WIRE 1856 -704 1856 -720 WIRE 640 -688 640 -720 WIRE 800 -688 800 -720 WIRE -288 -656 -288 -672 WIRE -176 -656 -176 -672 WIRE -64 -656 -64 -672 WIRE 64 -656 64 -720 WIRE 1584 -656 1584 -720 WIRE 240 -640 240 -720 WIRE 1952 -640 1952 -720 WIRE 1008 -624 1008 -720 WIRE 1168 -624 1168 -720 WIRE 1520 -608 1472 -608 WIRE 640 -592 640 -608 WIRE 800 -592 800 -624 WIRE 800 -592 640 -592 WIRE 848 -592 848 -672 WIRE 848 -592 800 -592 WIRE 1856 -592 1856 -624 WIRE 1856 -592 1808 -592 WIRE 1856 -560 1856 -592 WIRE -288 -544 -288 -576 WIRE -176 -544 -176 -576 WIRE -64 -544 -64 -576 WIRE 1584 -544 1584 -560 WIRE 560 -528 560 -720 WIRE 64 -496 64 -576 WIRE 240 -496 240 -576 WIRE 240 -496 64 -496 WIRE 496 -480 464 -480 WIRE 1008 -464 1008 -560 WIRE 1168 -464 1168 -560 WIRE 1168 -464 1008 -464 WIRE 1504 -464 1168 -464 WIRE 1584 -464 1504 -464 WIRE 1680 -464 1584 -464 WIRE 1856 -464 1856 -480 WIRE 1856 -464 1760 -464 WIRE 1952 -464 1952 -560 WIRE 1952 -464 1856 -464 WIRE 240 -432 240 -496 WIRE 1168 -432 1168 -464 WIRE 336 -384 336 -720 WIRE 560 -384 560 -432 WIRE 656 -384 560 -384 WIRE 848 -384 848 -592 WIRE 848 -384 736 -384 WIRE 1344 -352 1344 -400 WIRE 864 -320 832 -320 WIRE 976 -320 944 -320 WIRE -400 -304 -448 -304 WIRE -272 -304 -320 -304 WIRE 240 -304 240 -352 WIRE 1120 -304 1088 -304 WIRE 1232 -304 1200 -304 WIRE -528 -272 -528 -304 WIRE 336 -256 336 -304 WIRE 400 -256 336 -256 WIRE 464 -256 464 -480 WIRE 464 -256 400 -256 WIRE 736 -208 704 -208 WIRE 832 -208 832 -320 WIRE 832 -208 816 -208 WIRE 896 -208 832 -208 WIRE 976 -192 976 -320 WIRE 976 -192 960 -192 WIRE 992 -192 976 -192 WIRE 1088 -192 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Out FLAG 0 -144 SAWTOOTH FLAG -288 -544 0 FLAG 112 -160 +UB FLAG -288 -672 +US FLAG 1280 240 +US FLAG 336 96 0 FLAG 112 -64 0 FLAG 240 -352 +UB FLAG 560 -48 0 FLAG 240 -432 0 FLAG 560 -384 MOSST FLAG 960 -720 OUT FLAG 1168 -432 0 FLAG 400 -256 Q1C FLAG 848 0 +UB FLAG 1232 144 +UB FLAG 1232 272 -UB FLAG 1024 224 OPVO FLAG 320 224 REG FLAG 1408 208 MESS FLAG 1344 -400 +UB FLAG 1184 -208 +UB FLAG 1184 -144 -UB FLAG 1120 -128 0 FLAG 864 -144 0 FLAG 928 -224 +UB FLAG 928 -160 -UB SYMBOL res -544 -288 R0 SYMATTR InstName R1 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res -544 -80 R0 SYMATTR InstName R2 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res -304 -320 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R3 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res -304 16 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 560 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL cap -464 32 R0 SYMATTR InstName C1 SYMATTR Value 8.2E-9 SYMBOL voltage -176 -672 R0 SYMATTR InstName V1 SYMATTR Value -5 SYMBOL voltage -64 -672 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL res -96 -160 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 680 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL cap -96 -112 R0 SYMATTR InstName C2 SYMATTR Value 8.2E-9 SYMBOL voltage -288 -672 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 2.0 SYMBOL npn 272 -176 R0 SYMATTR InstName Q1 SYMATTR Value 2N4401 SYMBOL res 224 -320 R0 SYMATTR InstName R6 SYMATTR Value 4.7k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 320 -400 R0 SYMATTR InstName R7 SYMATTR Value 10k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL pnp 496 -80 M180 SYMATTR InstName Q2 SYMATTR Value BCP69P SYMBOL npn 496 -528 R0 SYMATTR InstName Q3 SYMATTR Value BCP55P SYMBOL cap 224 -640 R0 SYMATTR InstName C3 SYMATTR Value 1E-2 SYMBOL zener 816 -624 R180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D1 SYMATTR Value BZX84C10L SYMATTR Description Diode SYMATTR Type diode SYMBOL res 624 -704 R0 SYMATTR InstName R10 SYMATTR Value 330 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1936 -656 R0 SYMATTR InstName R11 SYMATTR Value 20 SYMBOL ind 1040 -704 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 200µ SYMBOL voltage 64 -672 R0 SYMATTR InstName V4 SYMATTR Value 50 SYMBOL schottky 1024 -560 R180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D3 SYMATTR Value B560C SYMBOL res 752 -400 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R8 SYMATTR Value 10 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 320 -48 R0 SYMATTR InstName R9 SYMATTR Value 330 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1040 208 M90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R12 SYMATTR Value 100 SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 864 32 M0 SYMATTR InstName R13 SYMATTR Value 1k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL cap 1200 32 M90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C5 SYMATTR Value 1E-7 SYMBOL res 1472 192 M90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R14 SYMATTR Value 47k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1840 -720 R0 SYMATTR InstName R15 SYMATTR Value 8.2k SYMBOL res 1840 -576 R0 SYMATTR InstName R16 SYMATTR Value 1k SYMBOL cap 1152 -624 R0 SYMATTR InstName C7 SYMATTR Value 4.7E-4 SYMATTR SpiceLine Rser=0.07 SYMBOL ind 1008 208 R90 WINDOW 0 5 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName L2 SYMATTR Value 10µ SYMBOL res 1568 -560 R0 SYMATTR InstName R17 SYMATTR Value 1.8 SYMATTR SpiceLine tol=10 pwr=2 SYMBOL res 1776 -480 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R18 SYMATTR Value 0.05 SYMBOL res 1232 -192 M90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R19 SYMATTR Value 1.3k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1328 -368 R0 SYMATTR InstName R20 SYMATTR Value 1.5k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1216 -320 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R21 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 1088 -208 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R22 SYMATTR Value 91k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 960 -336 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R23 SYMATTR Value 100k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL res 832 -224 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R24 SYMATTR Value 10k SYMATTR SpiceLine tol=5 pwr=0.25 SYMBOL pmos 928 -672 M270 SYMATTR InstName M1 SYMATTR Value Si7469DP SYMBOL Comparators\\\\LT1017 112 -128 R0 SYMATTR InstName U8 SYMBOL Opamps\\\\LT1014 928 -256 R0 SYMATTR InstName U9 SYMBOL Opamps\\\\LT1014 1184 -240 R0 SYMATTR InstName U10 SYMBOL Opamps\\\\LT1014 1232 160 M0 SYMATTR InstName U11 SYMBOL npn 1408 -704 R0 SYMATTR InstName Q4 SYMATTR Value 2N4401 SYMBOL npn 1520 -656 R0 SYMATTR InstName Q5 SYMATTR Value 2N3055 SYMBOL Opamps\\\\LT1014 -368 -80 M180 SYMATTR InstName U12 TEXT -176 -312 Left 0 !.tran 0 100ms 1ms 5ms startup