Version 4 SHEET 1 4600 1364 WIRE 672 16 560 16 WIRE 912 16 672 16 WIRE 1056 16 912 16 WIRE 1152 16 1056 16 WIRE 1232 16 1152 16 WIRE 1344 16 1232 16 WIRE 560 32 560 16 WIRE 672 32 672 16 WIRE 1232 32 1232 16 WIRE 1344 32 1344 16 WIRE 912 48 912 16 WIRE 1056 96 1056 16 WIRE 1232 128 1232 96 WIRE 1344 128 1344 112 WIRE 464 144 448 144 WIRE 560 144 560 112 WIRE 560 144 528 144 WIRE 672 144 672 112 WIRE 704 144 672 144 WIRE 816 144 784 144 WIRE 912 176 912 128 WIRE 912 176 784 176 WIRE 1008 176 912 176 WIRE 1056 208 1056 192 WIRE 1056 208 208 208 WIRE 560 224 560 144 WIRE 672 224 672 144 WIRE 784 224 784 176 WIRE 208 288 208 208 WIRE 448 288 208 288 WIRE 928 288 896 288 WIRE 960 288 928 288 WIRE 1056 288 1056 208 WIRE 1056 288 1024 288 WIRE 1152 304 1152 16 WIRE 208 384 208 288 WIRE 448 384 208 384 WIRE 1104 384 896 384 WIRE 928 400 928 288 WIRE 208 480 208 384 WIRE 224 480 208 480 WIRE 336 480 304 480 WIRE 448 480 336 480 WIRE 928 480 928 464 WIRE 928 480 896 480 WIRE 1152 480 1152 400 WIRE 1152 480 928 480 WIRE 1200 480 1152 480 WIRE 1248 480 1200 480 WIRE 1376 480 1328 480 WIRE 1440 480 1376 480 WIRE 1712 480 1440 480 WIRE 1440 496 1440 480 WIRE 112 512 -112 512 WIRE 336 512 336 480 WIRE 1200 512 1200 480 WIRE 448 576 432 576 WIRE 928 576 896 576 WIRE 1056 576 1056 288 WIRE 1056 576 928 576 WIRE 1056 592 1056 576 WIRE 1200 592 1200 576 WIRE 1440 592 1440 560 WIRE 1712 592 1712 560 WIRE 336 608 336 592 WIRE 112 640 112 592 WIRE 208 672 208 480 WIRE 448 672 208 672 WIRE 928 672 928 576 WIRE 928 672 896 672 WIRE 1056 672 1056 656 WIRE 320 768 256 768 WIRE 448 768 384 768 WIRE 928 768 896 768 WIRE -112 800 -112 512 WIRE 928 800 928 768 WIRE 928 800 -112 800 WIRE 1376 816 1376 480 WIRE 272 864 256 864 WIRE 368 864 352 864 WIRE 448 864 432 864 WIRE 1152 864 1152 480 WIRE 1152 864 896 864 WIRE 1152 880 1152 864 WIRE 1376 928 1376 896 WIRE 1376 928 1312 928 WIRE 1376 944 1376 928 WIRE 368 960 256 960 WIRE 448 960 368 960 WIRE 1104 960 896 960 WIRE 256 976 256 960 WIRE 368 976 368 960 WIRE 1376 1040 1376 1024 WIRE 368 1056 368 1040 WIRE 448 1056 368 1056 WIRE 1152 1056 1152 976 WIRE 1152 1056 896 1056 WIRE 256 1072 256 1040 WIRE 1152 1072 1152 1056 WIRE 560 1136 560 1120 WIRE 784 1136 784 1120 WIRE 256 1168 256 1152 WIRE 368 1168 368 1056 WIRE 368 1168 256 1168 WIRE 1312 1168 1312 928 WIRE 1312 1168 368 1168 FLAG 1152 1072 0 FLAG 1056 672 0 FLAG 1200 592 0 FLAG 784 1136 0 FLAG 560 1136 0 FLAG 1376 1040 0 FLAG 1440 592 0 FLAG 256 768 0 FLAG 1344 128 0 FLAG 1344 16 IN FLAG 432 576 0 FLAG 256 864 0 FLAG 1232 128 0 FLAG 448 144 0 FLAG 336 608 0 FLAG 816 144 0 FLAG 1712 592 0 FLAG 960 800 0 FLAG 112 640 0 SYMBOL res 544 16 R0 SYMATTR InstName R1 SYMATTR Value 261K SYMBOL nmos 1008 96 R0 SYMATTR InstName Q1 SYMATTR Value BSH114 SYMBOL res 896 32 R0 SYMATTR InstName R2 SYMATTR Value 80.6K SYMBOL schottky 1024 272 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 912 400 R0 SYMATTR InstName C1 SYMATTR Value .1µ SYMBOL nmos 1104 304 R0 SYMATTR InstName Q2 SYMATTR Value BSC100N10NSF SYMBOL nmos 1104 880 R0 SYMATTR InstName Q3 SYMATTR Value BSC100N10NSF SYMBOL cap 1040 592 R0 SYMATTR InstName C2 SYMATTR Value 1µ SYMBOL ind 1232 496 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 10µ SYMATTR SpiceLine Ipk=21.5 Rser=0.0069 Rpar=1459 Cpar=9.41p mfg="Wurth Elektronik" pn="74435561100 WE-HCB 1890" SYMBOL schottky 1184 576 M180 WINDOW 0 24 72 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D2 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 1360 800 R0 SYMATTR InstName R3 SYMATTR Value 11.55K SYMBOL res 1360 928 R0 SYMATTR InstName R4 SYMATTR Value 1K SYMBOL cap 1424 496 R0 WINDOW 39 29 72 Left 2 WINDOW 3 45 38 Left 2 SYMATTR SpiceLine Rser=10m SYMATTR Value 270µ SYMATTR InstName C3 SYMBOL cap 352 976 R0 WINDOW 39 24 92 Left 2 WINDOW 40 23 114 Left 2 SYMATTR InstName C4 SYMATTR Value 5p SYMBOL cap 384 752 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 1000p SYMBOL cap 432 848 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 WINDOW 39 58 32 VTop 2 SYMATTR InstName C6 SYMATTR Value .01µ SYMBOL PowerProducts\\LTC3810 672 672 R0 SYMATTR InstName U1 SYMBOL res 240 1056 R0 SYMATTR InstName R5 SYMATTR Value 200K SYMBOL cap 240 976 R0 SYMATTR InstName C7 SYMATTR Value 47p SYMBOL res 368 848 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10K SYMBOL voltage 1344 16 R0 WINDOW 40 24 132 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 24 139 Left 2 SYMATTR InstName V1 SYMATTR Value 62 SYMBOL cap 1216 32 R0 SYMATTR InstName C8 SYMATTR Value 68µ SYMBOL cap 528 128 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C9 SYMATTR Value 100p SYMBOL res 208 496 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R7 SYMATTR Value 91K SYMBOL res 320 496 R0 SYMATTR InstName R8 SYMATTR Value 6K SYMBOL res 656 16 R0 SYMATTR InstName R9 SYMATTR Value 470K SYMBOL res 688 160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R10 SYMATTR Value 12K SYMBOL res 1696 464 R0 SYMATTR InstName R11 SYMATTR Value 300m SYMBOL voltage 112 496 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 12V TEXT 1368 1152 Left 2 !.tran 10s startup TEXT 208 1208 Left 2 ;Note:\n If the simulation model is not found please update with the "Sync Release" command from the "Tools" menu.\n It remains the customer's responsibility to verify proper and reliable operation in the actual application.\n Component substitution and printed circuit board layout may significantly affect circuit performance or reliability\n Contact your local sales representative for assistance. This circuit is distributed to customers only for use with LTC parts\n Copyright © 2011 Linear Technology Inc. All rights reserved. TEXT 832 8 Bottom 2 ;LTC3810 - 100V Current Mode Synchronous Switching Regulator Controller\n36V to 72V Input Voltage to 12V @ 10A Buck Regulator\nInput: 36V-72V Output: 12V @ 10A