Version 4 SHEET 1 2688 2480 WIRE 608 -784 576 -784 WIRE 800 -784 688 -784 WIRE 896 -784 800 -784 WIRE 1088 -784 896 -784 WIRE 1536 -784 1088 -784 WIRE 896 -768 896 -784 WIRE 1536 -768 1536 -784 WIRE 800 -752 800 -784 WIRE 1088 -720 1088 -784 WIRE 800 -624 800 -688 WIRE 896 -624 896 -688 WIRE 1088 -592 1088 -640 WIRE 1232 -592 1232 -640 WIRE -336 -528 -432 -528 WIRE -208 -528 -336 -528 WIRE -48 -528 -208 -528 WIRE 320 -528 -48 -528 WIRE -336 -512 -336 -528 WIRE -208 -512 -208 -528 WIRE 1600 -512 1152 -512 WIRE 1696 -512 1600 -512 WIRE 1712 -512 1696 -512 WIRE 512 -480 480 -480 WIRE 768 -480 512 -480 WIRE 960 -480 768 -480 WIRE 1408 -480 960 -480 WIRE -48 -464 -48 -528 WIRE 1056 -448 1008 -448 WIRE 1088 -448 1056 -448 WIRE 1008 -432 1008 -448 WIRE 1088 -432 1088 -448 WIRE -336 -416 -336 -448 WIRE -208 -416 -208 -448 WIRE 480 -400 480 -416 WIRE 1088 -352 1088 -368 WIRE 768 -320 768 -480 WIRE 960 -320 960 -480 WIRE 1056 -320 1056 -448 WIRE 1152 -320 1152 -512 WIRE 512 -272 512 -480 WIRE 1408 -272 1408 -480 WIRE 640 -256 608 -256 WIRE 320 -240 320 -528 WIRE 1600 -240 1600 -512 WIRE -48 -208 -48 -384 WIRE 16 -208 -48 -208 WIRE 192 -208 16 -208 WIRE -48 -176 -48 -208 WIRE 16 -160 16 -208 WIRE 640 -160 368 -160 WIRE 1552 -160 1280 -160 WIRE -48 -80 -48 -96 WIRE 16 -80 16 -96 WIRE 16 -80 -48 -80 WIRE 512 -64 512 -208 WIRE 640 -64 512 -64 WIRE 1408 -64 1408 -208 WIRE 1408 -64 1280 -64 WIRE 512 -48 512 -64 WIRE 1408 -48 1408 -64 WIRE -48 -32 -48 -80 WIRE -208 32 -336 32 WIRE -128 32 -208 32 WIRE -64 32 -128 32 WIRE 96 32 16 32 WIRE 320 32 320 -144 WIRE 320 32 96 32 WIRE 512 32 512 16 WIRE 512 32 320 32 WIRE 640 32 512 32 WIRE 1408 32 1408 16 WIRE 1408 32 1280 32 WIRE 1600 32 1600 -144 WIRE 1600 32 1408 32 WIRE 1792 32 1600 32 WIRE 1856 32 1792 32 WIRE 1984 32 1936 32 WIRE 2064 32 1984 32 WIRE 320 48 320 32 WIRE 1600 48 1600 32 WIRE 1792 80 1792 32 WIRE 96 96 96 32 WIRE 640 128 368 128 WIRE 1552 128 1280 128 WIRE -336 144 -336 32 WIRE -208 144 -208 32 WIRE 320 160 320 144 WIRE 1600 160 1600 144 WIRE -128 224 -128 32 WIRE 336 224 -128 224 WIRE 464 224 336 224 WIRE 640 224 464 224 WIRE 1440 224 1280 224 WIRE 1568 224 1440 224 WIRE 1984 224 1984 32 WIRE 1984 224 1568 224 WIRE -336 240 -336 224 WIRE 336 240 336 224 WIRE 464 240 464 224 WIRE 1440 240 1440 224 WIRE 1568 240 1568 224 WIRE -208 256 -208 208 WIRE 96 320 96 176 WIRE 336 320 96 320 WIRE 464 320 464 304 WIRE 464 320 336 320 WIRE 640 320 464 320 WIRE 1440 320 1440 304 WIRE 1440 320 1280 320 WIRE 1568 320 1440 320 WIRE 1792 320 1792 160 WIRE 1792 320 1568 320 WIRE 192 416 192 -208 WIRE 496 416 192 416 WIRE 640 416 496 416 WIRE 1328 416 1280 416 WIRE 1376 416 1328 416 WIRE 1488 416 1440 416 WIRE 640 512 576 512 WIRE 1312 512 1280 512 WIRE 576 528 576 512 WIRE 784 592 784 576 WIRE 576 608 576 592 WIRE 1024 608 1024 576 WIRE 1312 608 1312 512 WIRE 1312 608 1024 608 WIRE 1024 624 1024 608 WIRE 784 688 784 672 WIRE 1136 736 1136 576 WIRE 1136 736 768 736 WIRE 320 752 -112 752 WIRE 1600 768 1152 768 WIRE 1696 768 1600 768 WIRE 1712 768 1696 768 WIRE 512 800 480 800 WIRE 960 800 512 800 WIRE 1408 800 960 800 WIRE 1088 832 1056 832 WIRE 1088 848 1088 832 WIRE 480 880 480 864 WIRE 1088 928 1088 912 WIRE 768 960 768 736 WIRE 960 960 960 800 WIRE 1056 960 1056 832 WIRE 1152 960 1152 768 WIRE 512 1008 512 800 WIRE 1408 1008 1408 800 WIRE 640 1024 608 1024 WIRE 320 1040 320 752 WIRE 1600 1040 1600 768 WIRE 640 1120 368 1120 WIRE 1552 1120 1280 1120 WIRE 512 1216 512 1072 WIRE 640 1216 512 1216 WIRE 1408 1216 1408 1072 WIRE 1408 1216 1280 1216 WIRE 512 1232 512 1216 WIRE 1408 1232 1408 1216 WIRE -128 1312 -192 1312 WIRE -64 1312 -128 1312 WIRE 96 1312 16 1312 WIRE 320 1312 320 1136 WIRE 320 1312 96 1312 WIRE 512 1312 512 1296 WIRE 512 1312 320 1312 WIRE 640 1312 512 1312 WIRE 1408 1312 1408 1296 WIRE 1408 1312 1280 1312 WIRE 1600 1312 1600 1136 WIRE 1600 1312 1408 1312 WIRE 1792 1312 1600 1312 WIRE 1856 1312 1792 1312 WIRE 1984 1312 1936 1312 WIRE 2064 1312 1984 1312 WIRE 320 1328 320 1312 WIRE 1600 1328 1600 1312 WIRE 1792 1360 1792 1312 WIRE 96 1376 96 1312 WIRE 640 1408 368 1408 WIRE 1552 1408 1280 1408 WIRE 320 1440 320 1424 WIRE 1600 1440 1600 1424 WIRE -128 1504 -128 1312 WIRE 336 1504 -128 1504 WIRE 464 1504 336 1504 WIRE 640 1504 464 1504 WIRE 1440 1504 1280 1504 WIRE 1568 1504 1440 1504 WIRE 1984 1504 1984 1312 WIRE 1984 1504 1568 1504 WIRE 336 1520 336 1504 WIRE 464 1520 464 1504 WIRE 1440 1520 1440 1504 WIRE 1568 1520 1568 1504 WIRE 96 1600 96 1456 WIRE 336 1600 96 1600 WIRE 464 1600 464 1584 WIRE 464 1600 336 1600 WIRE 640 1600 464 1600 WIRE 1440 1600 1440 1584 WIRE 1440 1600 1280 1600 WIRE 1568 1600 1440 1600 WIRE 1792 1600 1792 1440 WIRE 1792 1600 1568 1600 WIRE 640 1696 608 1696 WIRE 1296 1696 1280 1696 WIRE 640 1792 576 1792 WIRE 1312 1792 1280 1792 WIRE 784 1872 784 1856 WIRE 1024 1888 1024 1856 WIRE 1312 1888 1312 1792 WIRE 1312 1888 1024 1888 WIRE 1024 1904 1024 1888 FLAG 1600 160 0 FLAG 2064 32 IN FLAG -432 -528 OUT FLAG 320 160 0 FLAG -208 256 0 FLAG -336 240 0 FLAG -336 32 IN FLAG -48 -32 0 FLAG -336 -416 0 FLAG -208 -416 0 FLAG 480 -400 0 FLAG 1488 416 0 FLAG 576 608 0 FLAG 1024 624 0 FLAG 1696 -512 OUT FLAG 784 688 0 FLAG 1008 -352 0 FLAG 1088 -352 0 FLAG 1600 1440 0 FLAG 2064 1312 IN FLAG -112 752 OUT FLAG 320 1440 0 FLAG -192 1312 IN FLAG 480 880 0 FLAG 1024 1904 0 FLAG 1696 768 OUT FLAG 1088 928 0 FLAG 1056 -448 EXTVCC FLAG 1056 832 EXTVCC FLAG 576 1792 SS FLAG 576 512 SS FLAG 1328 416 ITH FLAG 1296 1696 ITH FLAG 496 416 FB FLAG 608 1696 FB FLAG 608 -256 RUN FLAG 608 1024 RUN FLAG 896 -624 0 FLAG 576 -784 OUT FLAG 800 -624 0 FLAG 1536 -784 OUT_Load FLAG 1232 -592 0 FLAG 1088 -592 0 SYMBOL LTC3787 960 128 R0 SYMATTR InstName U1 SYMBOL cap 496 -416 R180 WINDOW 3 24 8 Left 2 WINDOW 0 24 56 Left 2 SYMATTR Value 4.7µ SYMATTR InstName C1 SYMBOL cap 1392 -48 R0 SYMATTR InstName C5 SYMATTR Value .1µ SYMBOL schottky 1392 -272 R0 WINDOW 3 23 69 Left 2 SYMATTR Value MBR0540 SYMATTR InstName D2 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind 1952 48 M270 WINDOW 0 42 54 VTop 2 WINDOW 3 -2 56 VBottom 2 SYMATTR InstName Lo2 SYMATTR Value {Lo1} SYMATTR SpiceLine Rser={DCR1} SYMBOL cap 528 -48 M0 SYMATTR InstName C2 SYMATTR Value .1µ SYMBOL schottky 528 -272 M0 WINDOW 3 23 69 Left 2 SYMATTR Value MBR0540 SYMATTR InstName D1 SYMATTR Description Diode SYMATTR Type diode SYMBOL voltage -336 128 M0 WINDOW 123 0 0 Left 2 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=28m SYMATTR InstName Vin1 SYMATTR Value {Vin1} SYMBOL cap -192 144 M0 WINDOW 123 25 91 Left 2 SYMATTR Value2 x{nCinb1} SYMATTR InstName Cinb1 SYMATTR Value {Cinb1} SYMBOL ind -80 48 R270 WINDOW 0 39 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName Lo1 SYMATTR Value {Lo1} SYMATTR SpiceLine Rser={DCR1} SYMBOL res -32 -192 M0 SYMATTR InstName RfbBot1 SYMATTR Value {RfbBot1} SYMBOL res -32 -480 M0 SYMATTR InstName RfbTop1 SYMATTR Value {RfbTop1} SYMBOL cap 32 -160 M0 WINDOW 0 -76 5 Left 2 WINDOW 3 -84 44 Left 2 SYMATTR InstName CfbBot1 SYMATTR Value {CfbBot1} SYMBOL cap -192 -512 M0 WINDOW 123 33 91 Left 2 SYMATTR Value2 x{nCob1} SYMATTR InstName Cob1 SYMATTR Value {Cob1} SYMATTR SpiceLine Rser={ESRb1} Lser={ESLb1} SYMBOL cap -320 -512 M0 WINDOW 123 36 88 Left 2 SYMATTR Value2 x{nCoc1} SYMATTR InstName Coc1 SYMATTR Value {Coc1} SYMATTR SpiceLine Rser={ESRc1} Lser={ESLc1} SYMBOL cap 1376 400 M90 WINDOW 0 -35 33 VBottom 2 WINDOW 3 -29 35 VTop 2 WINDOW 39 42 146 VTop 2 SYMATTR InstName C3 SYMATTR Value {Cth1} SYMATTR SpiceLine Rser={Rth1} Cpar={Cthp1} SYMBOL cap 560 528 R0 SYMATTR InstName C4 SYMATTR Value 10n SYMBOL cap 480 240 M0 SYMATTR InstName SenseC1 SYMATTR Value {SenseC1} SYMBOL res 352 224 M0 SYMATTR InstName SenseRp1 SYMATTR Value {SenseRp1} SYMBOL res 112 80 M0 SYMATTR InstName SenseRs1 SYMATTR Value {SenseRs1} SYMBOL cap 1424 240 R0 SYMATTR InstName SenseC2 SYMATTR Value {SenseC1} SYMBOL res 1552 224 R0 SYMATTR InstName SenseRp2 SYMATTR Value {SenseRp1} SYMBOL res 1776 64 R0 SYMATTR InstName SenseRs2 SYMATTR Value {SenseRs1} SYMBOL res 768 576 R0 SYMATTR InstName R1 SYMATTR Value {RFreq_1} SYMBOL cap 1072 -432 R0 SYMATTR InstName C6 SYMATTR Value 1µ SYMATTR SpiceLine Rser=4m SYMBOL voltage 1008 -448 M0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName Vin2 SYMATTR Value 12 SYMBOL nmos 368 -240 M0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q5 SYMATTR Value BSC028N06LS3 SYMBOL nmos 368 48 M0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q1 SYMATTR Value BSC028N06LS3 SYMBOL nmos 1552 -240 R0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q2 SYMATTR Value BSC028N06LS3 SYMBOL nmos 1552 48 R0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q3 SYMATTR Value BSC028N06LS3 SYMBOL LTC3787 960 1408 R0 SYMATTR InstName U2 SYMBOL cap 496 864 R180 WINDOW 3 24 8 Left 2 WINDOW 0 24 56 Left 2 SYMATTR Value 4.7µ SYMATTR InstName C7 SYMBOL cap 1392 1232 R0 SYMATTR InstName C8 SYMATTR Value .47µ SYMBOL schottky 1392 1008 R0 WINDOW 3 23 69 Left 2 SYMATTR Value MBR0540 SYMATTR InstName D3 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind 1952 1328 M270 WINDOW 0 42 54 VTop 2 WINDOW 3 -2 56 VBottom 2 SYMATTR InstName Lo3 SYMATTR Value {Lo1} SYMATTR SpiceLine Rser={DCR1} SYMBOL cap 528 1232 M0 SYMATTR InstName C9 SYMATTR Value .1µ SYMBOL schottky 528 1008 M0 WINDOW 3 23 69 Left 2 SYMATTR Value MBR0540 SYMATTR InstName D4 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind -80 1328 R270 WINDOW 0 39 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName Lo4 SYMATTR Value {Lo1} SYMATTR SpiceLine Rser={DCR1} SYMBOL cap 480 1520 M0 SYMATTR InstName SenseC3 SYMATTR Value {SenseC1} SYMBOL res 352 1504 M0 SYMATTR InstName SenseRp3 SYMATTR Value {SenseRp1} SYMBOL res 112 1360 M0 SYMATTR InstName SenseRs3 SYMATTR Value {SenseRs1} SYMBOL cap 1424 1520 R0 SYMATTR InstName SenseC4 SYMATTR Value {SenseC1} SYMBOL res 1552 1504 R0 SYMATTR InstName SenseRp4 SYMATTR Value {SenseRp1} SYMBOL res 1776 1344 R0 SYMATTR InstName SenseRs4 SYMATTR Value {SenseRs1} SYMBOL cap 1072 848 R0 SYMATTR InstName C12 SYMATTR Value 1µ SYMATTR SpiceLine Rser=4m SYMBOL nmos 368 1040 M0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q4 SYMATTR Value BSC028N06LS3 SYMBOL nmos 368 1328 M0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q6 SYMATTR Value BSC028N06LS3 SYMBOL nmos 1552 1040 R0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q7 SYMATTR Value BSC028N06LS3 SYMBOL nmos 1552 1328 R0 WINDOW 0 57 33 Left 2 WINDOW 3 62 73 Left 2 SYMATTR InstName Q8 SYMATTR Value BSC028N06LS3 SYMBOL res 880 -784 R0 SYMATTR InstName R3 SYMATTR Value 100 SYMBOL ind 592 -768 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 400n SYMATTR SpiceLine Ipk=111 Rser=0.0005 Rpar=37.68 Cpar=0 mfg="Coilcraft" pn="XAL1580-401" SYMBOL polcap 816 -752 M0 WINDOW 123 33 91 Left 2 WINDOW 3 24 56 Left 2 SYMATTR Value 100µ SYMATTR InstName Cob2 SYMATTR SpiceLine V=50 Irms=2.01 Rser=0.043 Lser=0 SYMATTR Description Capacitor SYMATTR Type cap SYMBOL res 1072 -736 R0 SYMATTR InstName R2 SYMATTR Value 17 TEXT -568 1840 Left 2 ;parameter imported from LTPowerCAD Design Tool: TEXT -568 1800 Left 2 !.tran 2m startup TEXT -568 1768 Left 2 ;If simulation model is not found, please "Sync release". TEXT -568 1704 Left 2 ;Note: Simulation is running at the default switching frequency for the part.\nPlease manually adjust for additional switching frequency options. TEXT -568 1888 Left 2 !.params Vin1=12 Cinb1=270u CinbESR1=20m nCinb1=4 Cinc1=9.4u CincESR1=2m nCinc1=4 fsw1=254k \n.params RfbTop1=475k RfbBot1=15.8k CfbTop1=0p CfbBot1=0p \n.params Rth1=5.1k Cth1=33000p Cthp1=680p \n.params SenseRs1=10k SenseC1=0.22u SenseRp1=20k5 \n.params Rsense1=2m RsenseFilterR1=0 RsenseFilterC1=1n \n.params Lo1=4u7 DCR1=3.35m \n.params Cob1=68u ESRb1=20m ESLb1=5n nCob1=4 \n.params Coc1=4.2u ESRc1=1.9m ESLc1=0.3062n nCoc1=4 \n.params Rfreq_1=43.2k Rfreq2_1=0k \n.params RLoad1=1.24266666666667 \n.params nQC1=1 nQS1=1 TEXT -344 -672 Left 2 !;.save V(out_load) V(out) V(in) V(fb) I(Lo1) I(Lo2) I(Lo3) I(Lo4) I(I1) V(fb) I(vin1) TEXT -344 -824 Left 2 !;.ic V(out) = 37\n;.ic V(out_load) = 37\n;.ic V(in) = 12\n;.ic V(fb) = 1