Version 4
SHEET 1 1012 680
WIRE -480 -336 -480 -368
WIRE -480 -112 -480 -160
WIRE -480 256 -480 224
WIRE -480 352 -480 336
WIRE -464 -368 -480 -368
WIRE -464 96 -480 96
WIRE -464 160 -480 160
WIRE -400 224 -480 224
WIRE -400 256 -400 224
WIRE -400 336 -400 320
WIRE -384 96 -400 96
WIRE -384 112 -384 96
WIRE -384 160 -400 160
WIRE -384 176 -384 160
WIRE -384 224 -400 224
WIRE -368 -160 -480 -160
WIRE -368 -112 -384 -112
WIRE -368 -64 -368 -80
WIRE -288 -400 -320 -400
WIRE -288 -384 -288 -400
WIRE -272 256 -288 256
WIRE -272 272 -272 256
WIRE -272 352 -272 336
WIRE -256 80 -272 80
WIRE -256 96 -256 80
WIRE -256 192 -272 192
WIRE -256 192 -256 176
WIRE -240 -160 -272 -160
WIRE -208 -400 -288 -400
WIRE -208 -368 -208 -384
WIRE -160 -112 -160 -144
WIRE -144 -144 -160 -144
WIRE -144 80 -160 80
WIRE -144 192 -176 192
WIRE -144 192 -144 160
WIRE -144 208 -144 192
WIRE -144 368 -144 352
WIRE -128 -400 -144 -400
WIRE -64 192 -144 192
WIRE 32 192 0 192
WIRE 32 208 32 192
WIRE 32 288 32 272
WIRE 64 -224 48 -224
WIRE 64 -176 64 -224
WIRE 64 -96 64 -112
WIRE 80 -224 64 -224
WIRE 128 192 32 192
WIRE 128 208 128 192
WIRE 128 304 128 288
WIRE 128 320 128 304
WIRE 128 416 128 400
WIRE 144 -272 144 -288
WIRE 144 -160 144 -176
WIRE 144 -144 144 -160
WIRE 144 -48 144 -64
WIRE 160 -288 144 -288
WIRE 160 304 128 304
WIRE 192 -160 144 -160
WIRE 224 192 128 192
WIRE 240 192 224 192
WIRE 240 208 240 192
WIRE 240 304 240 288
WIRE 256 -208 256 -224
WIRE 256 -48 144 -48
WIRE 256 -48 256 -112
WIRE 272 -224 256 -224
WIRE 272 -48 256 -48
FLAG -480 352 0
FLAG -384 224 Vcc
FLAG -272 352 0
FLAG -128 -400 osc
FLAG -320 -400 ct
FLAG -384 -112 osc
FLAG 48 -224 drv
FLAG -272 80 Vcc
FLAG -160 80 Vcc
FLAG -400 336 0
FLAG 32 288 0
FLAG 240 304 0
FLAG -144 -144 drv
FLAG 128 416 0
FLAG 160 304 fb
FLAG 224 192 o
FLAG -144 368 0
FLAG -176 192 swc
FLAG -240 -160 q
FLAG -480 -256 G
FLAG -464 -368 ref
FLAG 272 -224 swc
FLAG -272 192 drc
FLAG 160 -288 drc
FLAG -288 256 ct
FLAG -288 -304 G
FLAG -480 -32 G
FLAG -160 -32 G
FLAG 64 -96 G
FLAG -208 -368 G
FLAG -368 -64 G
FLAG -384 112 0
FLAG -480 96 G
FLAG 272 -48 swe
FLAG -384 176 0
FLAG -480 160 swe
SYMBOL voltage -480 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 132 Left 0
SYMATTR SpiceLine Rser=30m
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL cap -288 272 R0
SYMATTR InstName C1
SYMATTR Value 470p
SYMBOL Digital\\schmtbuf -208 -464 R0
WINDOW 3 25 101 Left 0
SYMATTR Value Vt=0.5 Vh=0.4 Trise=100n
SYMATTR InstName A1
SYMBOL bi -288 -384 R0
SYMATTR InstName B1
SYMATTR Value I=V(osc) - V(G) > 0.5 ? 100u : -25u
SYMBOL bv -480 -128 R0
WINDOW 0 -41 7 Left 0
WINDOW 3 -45 154 Left 0
SYMATTR InstName B2
SYMATTR Value V=V(Vcc)-V(G) >= 3.5 & V(osc)-V(G) < 0.5 & V(ct)-V(G) < 0.75 & V(ct)-V(G) > 150*(V(fb)-V(G) - (V(ref)-V(G))) ? 1 : 0
SYMBOL Digital\\srflop -320 -208 R0
WINDOW 3 -25 151 Left 0
SYMATTR Value Trise=100n
SYMATTR InstName A2
SYMBOL npn 80 -272 R0
SYMATTR InstName Q1
SYMATTR Value NP
SYMBOL npn 192 -208 R0
SYMATTR InstName Q2
SYMATTR Value NP2
SYMBOL res 128 -160 R0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res -240 192 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 39
SYMBOL ind -160 64 R0
SYMATTR InstName L1
SYMATTR Value 56u
SYMATTR SpiceLine Ipk=2 Rser=0.0778 Rpar=0 Cpar=0
SYMBOL schottky -64 208 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 84 47 VBottom 0
SYMATTR InstName D1
SYMATTR Value MBRS340
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -416 256 R0
SYMATTR InstName C2
SYMATTR Value 47u
SYMBOL cap 16 208 R0
SYMATTR InstName C3
SYMATTR Value 47u
SYMBOL res 112 192 R0
SYMATTR InstName R3
SYMATTR Value 27k
SYMBOL res 112 304 R0
SYMATTR InstName R4
SYMATTR Value 2.45k
SYMBOL res -160 192 R0
SYMATTR InstName R7
SYMATTR Value 300
SYMBOL cap -160 288 R0
SYMATTR InstName C4
SYMATTR Value 680p
SYMBOL load2 240 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 0.15
SYMBOL bi2 -160 -112 R0
SYMATTR InstName B3
SYMATTR Value I=((V(q)-V(G)-0.3)/0.7)*10m
SYMBOL diode 80 -112 R180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D2
SYMBOL bv -480 -352 R0
SYMATTR InstName B4
SYMATTR Value V=V(Vcc) - V(G) >= 2 ? 1.25 : 0
SYMBOL Misc\\jumper -432 32 R0
SYMATTR InstName X1
SYMBOL Misc\\jumper -432 96 R0
SYMATTR InstName X2
TEXT -536 416 Left 0 !.model NP NPN(BF=120 Cje=15p Cjc=5p Rb=10)\n.model NP2 NPN(BF=120 Cje=50p Cjc=16p Rb=2)\n.ic V(ct)=0.05 V(o)=15.1\n.tran 0 500u 0 20n uic startup