Version 4 SHEET 1 2064 1464 WIRE 704 -1024 48 -1024 WIRE 48 -960 48 -1024 WIRE 704 -944 704 -1024 WIRE 704 -832 704 -864 WIRE 880 -832 704 -832 WIRE 192 -752 128 -752 WIRE 288 -752 192 -752 WIRE 496 -752 352 -752 WIRE 800 -752 496 -752 WIRE 128 -720 128 -752 WIRE 496 -624 496 -752 WIRE 800 -624 800 -752 WIRE 448 -608 352 -608 WIRE 704 -592 704 -832 WIRE 48 -576 48 -880 WIRE 128 -576 128 -640 WIRE 128 -576 48 -576 WIRE 48 -560 48 -576 WIRE 448 -528 448 -560 WIRE 496 -512 496 -544 WIRE 656 -512 496 -512 WIRE 496 -480 496 -512 WIRE 352 -464 352 -608 WIRE 352 -464 -896 -464 WIRE 448 -464 352 -464 WIRE 448 -384 448 -416 WIRE 496 -336 496 -400 WIRE 704 -336 704 -496 WIRE 704 -336 496 -336 WIRE 736 -336 704 -336 WIRE 800 -336 800 -560 WIRE 800 -336 736 -336 WIRE 912 -336 800 -336 WIRE 1104 -336 992 -336 WIRE 1392 -336 1104 -336 WIRE 1504 -336 1392 -336 WIRE 1520 -336 1504 -336 WIRE 1104 -224 1104 -336 WIRE 1200 -224 1104 -224 WIRE 704 -192 704 -336 WIRE 1392 -192 1392 -336 WIRE 1520 -192 1520 -336 WIRE 1104 -160 1104 -224 WIRE 1200 -144 1200 -224 WIRE 1104 -16 1104 -80 WIRE 1200 -16 1200 -80 WIRE 1200 -16 1104 -16 WIRE 704 48 704 -128 WIRE 1392 48 1392 -128 WIRE 1392 48 704 48 WIRE 1520 48 1520 -112 WIRE 1520 48 1392 48 WIRE 704 64 704 48 WIRE -896 160 -896 -464 WIRE -368 160 -896 160 WIRE -256 160 -368 160 WIRE 160 160 -160 160 WIRE -32 208 -160 208 WIRE 496 224 416 224 WIRE 416 272 416 224 WIRE 1104 272 1104 -16 WIRE 1104 272 816 272 WIRE 496 288 496 224 WIRE 496 288 464 288 WIRE 512 288 496 288 WIRE -832 320 -864 320 WIRE -736 320 -768 320 WIRE -608 320 -656 320 WIRE 880 320 816 320 WIRE 512 336 464 336 WIRE 160 368 160 160 WIRE 1104 368 1104 272 WIRE 880 384 880 320 WIRE -368 400 -368 160 WIRE -336 400 -368 400 WIRE -208 400 -272 400 WIRE -32 400 -32 208 WIRE -896 416 -896 160 WIRE -864 416 -864 320 WIRE -864 416 -896 416 WIRE -784 416 -864 416 WIRE -608 416 -608 320 WIRE -608 416 -704 416 WIRE -576 416 -608 416 WIRE -464 416 -576 416 WIRE 416 416 416 352 WIRE 416 416 352 416 WIRE 528 416 416 416 WIRE 624 416 528 416 WIRE -336 432 -400 432 WIRE -576 448 -576 416 WIRE 624 448 624 416 WIRE 416 464 416 416 WIRE 528 480 528 416 WIRE 624 496 608 496 WIRE 736 528 672 528 WIRE 608 560 608 496 WIRE 624 560 624 544 WIRE 624 560 608 560 WIRE -576 576 -576 512 WIRE -32 576 -32 480 WIRE -32 576 -576 576 WIRE 160 576 160 448 WIRE 160 576 -32 576 WIRE 416 576 416 544 WIRE 416 576 160 576 WIRE 528 576 528 544 WIRE 528 576 416 576 WIRE 624 576 624 560 WIRE 624 576 528 576 WIRE 880 576 880 464 WIRE 880 576 624 576 WIRE 1104 576 1104 448 WIRE 1104 576 880 576 WIRE 880 592 880 576 WIRE -208 640 -208 400 WIRE 736 640 736 528 WIRE 736 640 -208 640 FLAG 880 592 0 FLAG 704 64 0 FLAG 48 -560 0 FLAG 192 -752 VCC FLAG 736 -336 SW FLAG 48 -1024 VIN FLAG 1504 -336 VOUT FLAG 448 -528 0 FLAG 448 -384 0 FLAG 816 320 IN+ IOPIN 816 320 Out FLAG 816 272 IN- IOPIN 816 272 Out FLAG 512 288 VIN IOPIN 512 288 In FLAG 512 336 VD IOPIN 512 336 In FLAG 352 416 RAMP IOPIN 352 416 Out FLAG 880 -832 VD IOPIN 880 -832 Out SYMBOL voltage 880 368 R0 WINDOW 3 -113 109 Invisible 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value PULSE(0 1 0 300u 1m 1) SYMATTR InstName V1 SYMBOL bv 160 352 R0 WINDOW 3 -133 121 Left 2 SYMATTR Value V=if(V(IN+)>V(IN-),5V,0V) SYMATTR InstName B1 SYMBOL Digital\\srflop -208 112 M0 WINDOW 3 -111 145 Left 2 SYMATTR Value vhigh=5V vlow=0V SYMATTR InstName A1 SYMBOL nmos 656 -592 R0 SYMATTR InstName M1 SYMATTR Value RSR025N05 SYMBOL ind 896 -320 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 4.7µ SYMBOL cap 1376 -192 R0 SYMATTR InstName C2 SYMATTR Value 50µ SYMATTR SpiceLine Rser=2m SYMBOL res 1504 -208 R0 SYMATTR InstName R3 SYMATTR Value 330 SYMBOL cap 784 -624 R0 SYMATTR InstName C3 SYMATTR Value 0.047µ SYMBOL voltage 48 -976 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 12 SYMBOL voltage 128 -736 R0 WINDOW 123 0 0 Left 0 WINDOW 39 20 124 Left 2 SYMATTR SpiceLine Rser=100 SYMATTR InstName V5 SYMATTR Value 5 SYMBOL diode 288 -736 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMBOL res 1120 -64 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R5 SYMATTR Value 23k SYMBOL res 1088 464 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL sw 496 -528 M180 SYMATTR InstName S1 SYMATTR Value SW_DRVH SYMBOL sw 496 -496 R0 SYMATTR InstName S2 SYMATTR Value SW_DRVL SYMBOL g2 416 368 R180 SYMATTR InstName G1 SYMATTR Value 2m SYMATTR SpiceLine Ilimit=30u SYMBOL res 400 448 R0 SYMATTR InstName R2 SYMATTR Value 50k SYMBOL cap 512 480 R0 SYMATTR InstName C4 SYMATTR Value 1p SYMBOL res 688 -960 R0 SYMATTR InstName R4 SYMATTR Value 10m SYMBOL bv -32 384 R0 WINDOW 3 -150 151 Left 2 SYMATTR Value V=if(V(RAMP)>0.5V,5V,0V) SYMATTR InstName B2 SYMBOL schottky 720 -128 R180 WINDOW 0 -41 68 Left 2 WINDOW 3 -150 38 Left 2 SYMATTR InstName D1 SYMATTR Value RB055L-30 SYMATTR Description Diode SYMATTR Type diode SYMBOL Digital\\and -304 352 R0 SYMATTR InstName A3 SYMBOL res -800 400 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 20k SYMBOL cap -560 448 M0 SYMATTR InstName C5 SYMATTR Value 3p SYMBOL Digital\\buf -464 352 R0 WINDOW 3 -1 127 Left 2 SYMATTR Value vhigh=5V vlow=0V SYMATTR InstName A6 SYMBOL nmos4 672 448 M0 WINDOW 0 -9 -18 Left 2 WINDOW 3 -71 31 Left 2 SYMATTR InstName M2 SYMATTR Value2 l=1u w=10u ad=30p as=30p pd=16u ps=16u m=1 SYMBOL diode -768 304 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMBOL res -752 304 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 20 SYMBOL cap 1184 -144 R0 SYMATTR InstName C1 SYMATTR Value 220p TEXT -888 656 Left 2 !.tran 1m TEXT 832 -1040 Left 2 !.Model SW_DRVH SW(Ron=1 Roff=10meg Vt=2.25 vh=0.25) TEXT 832 -1008 Left 2 !.Model SW_DRVL SW(Ron=1 Roff=10meg Vt=-2.25 vh=0.25)