Version 4 SHEET 1 916 680 WIRE 16 144 -96 144 WIRE 48 144 16 144 WIRE 80 144 48 144 WIRE 192 144 160 144 WIRE 240 144 192 144 WIRE 368 144 320 144 WIRE 416 144 368 144 WIRE 464 144 416 144 WIRE 656 144 464 144 WIRE 832 144 736 144 WIRE 368 176 368 144 WIRE 464 192 464 144 WIRE 832 192 832 144 WIRE 48 240 48 144 WIRE 96 240 48 240 WIRE 192 240 192 144 WIRE 192 240 160 240 WIRE 368 304 368 256 WIRE 464 304 464 256 WIRE 464 304 368 304 WIRE 608 304 464 304 WIRE 640 304 608 304 WIRE 832 304 832 272 WIRE 832 304 640 304 WIRE -96 368 -96 144 WIRE 608 368 608 304 WIRE -96 512 -96 448 WIRE 608 512 608 448 WIRE 608 512 -96 512 WIRE -96 544 -96 512 FLAG -96 544 0 FLAG 16 144 Tj FLAG 416 144 Tc FLAG 640 304 Tamb FLAG 832 144 Ths SYMBOL res 224 160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 0.3 SYMBOL res 816 176 R0 SYMATTR InstName R2 SYMATTR Value 1 SYMBOL cap 160 224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 250u SYMBOL res 176 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 0.4 SYMBOL res 352 160 R0 SYMATTR InstName R4 SYMATTR Value 100 SYMBOL cap 448 192 R0 SYMATTR InstName C1 SYMATTR Value 10m SYMBOL current -96 448 M180 WINDOW 0 24 80 Left 2 WINDOW 3 16 -12 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value PULSE(0 50 0 0.1u 0.1u {T/2-0.1u} {T}) SYMBOL voltage 608 352 R0 SYMATTR InstName V1 SYMATTR Value 40 SYMBOL res 752 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 0.3 TEXT -16 424 Left 2 ;0/50W TEXT -72 -88 Left 2 !.tran 0.1 TEXT -72 -56 Left 2 !.step param T list 100u 10m TEXT -40 392 Left 2 ;I = P[W] TEXT 80 304 Left 2 ;tau=100u TEXT 384 328 Left 2 ;tau=1 TEXT 664 424 Left 2 ;Tamb TEXT -72 -160 Left 4 ;Thermal Model TEXT 784 40 Left 2 ;heatsink TEXT 176 24 Left 2 ;transistor TEXT 384 80 Left 2 ;package TEXT 160 80 Left 2 ;chip LINE Normal 144 80 64 80 2 LINE Normal 336 80 224 80 2 RECTANGLE Normal 544 352 -16 48 RECTANGLE Normal 912 352 768 64 2