* G:\SwCADIII\lib\sym\EXTRA\UC\UC384xA\LT3844A.asc .SUBCKT LT3844A1 Err Vfb Ifb Osc COM Out Vcc Ref I1 Vcc COM TBL(0 0 1 .2m) D1 COM Vcc 34V A1 Vcc COM COM COM COM COM N006 COM SCHMITT Vt=13 Vh=3.0 Vhigh=2.5 Rout=1k R1 Vcc N006 8e6 C1 N006 COM 1p S1 N009 Vcc N006 2v5 ref D2 N009 Vcc V65 C2 2v5 COM 1p Rpar=240 R2 2v5 N009 240 R3 Ref N009 280m C3 COM Ref 10p C4 Osc COM 5p A2 Osc COM COM COM COM COM N005 COM ExtOsc Vtcap=1.75 Vhcap=.85 Icharge=1p Idischarge=8.3m duty=.96 tripdt=5n nobreak A3 N005 COM COM COM COM COM N008 COM Counter cycles=2 C5 Vfb COM 1p R4 N004 Vfb 165k C6 Err N004 1p Rpar=10G A4 N004 2v5 COM COM COM COM Err COM OTA Vhigh=6 Vlow=0.7 Isrc=1m Isink=-6m Rclamp=1 g=5 Rout=25k Cout=5p eaclk=A2 powerup=!V(fault,Com) C7 Ifb COM 5p R5 N003 Ifb 75k C8 N003 COM 1p D3 Err N007 2R D4 N007 COM 1R C9 N007 COM 1p Rpar=1e6 A5 N008 COM COM N003 N007 COM N010 COM SERflop Vt=1u nobreak trise=200n tripdt=5n A6 Ref COM COM COM COM fault COM COM SCHMITT Vt=4.8 Vh=.1 trise=200n S2 Out Vcc N010 fault Ho S3 Com Out fault N010 Lo C10 Vcc COM 20p C11 Out Com 20p .model D D *.lib G:\SwCADIII\lib\cmp\standard.dio .model 1R d(Vfwd=1 Ron=1) .model 2R d(Vfwd=1.3 Ron=2e6) .model 34V d(Ron=.5 Vfwd=.5 Vrev=34 Rrev=22) .model ref sw(Vh=-11m Ilimit=100m) .model Ho sw(Vt= .48 Vh=-.25 Ron=2 Roff=100k Vser=1.2) .model Lo sw(Vt=-.52 Vh=-.25 Ron=6 Roff=300k) .model V65 d(Vfwd=0.65) * >> UC3845A <<\nLTspice A-Device Behavioral Model\nCopyright 2004 by analog@ieee.org * NOTES:\nUC3842A: for A1 Vt=13 Vh=3.0 and bypass A3 (delete)\nUC3843A: for A1 Vt=8.2 Vh=0.3 and bypass A3 (delete)\nUC3844A: for A1 Vt=13 Vh=3.0; for A3 cycles=2\nUC3845A: for A1 Vt=8.2 Vh=0.3; for A3 cycles=2 *.backanno .ENDS