Version 4 SHEET 1 5952 680 WIRE 2016 -496 1760 -496 WIRE 2304 -496 2016 -496 WIRE 2512 -496 2304 -496 WIRE 2656 -496 2512 -496 WIRE 2864 -496 2768 -496 WIRE 2976 -496 2864 -496 WIRE 3072 -496 2976 -496 WIRE 3136 -496 3072 -496 WIRE 1760 -480 1760 -496 WIRE 2016 -480 2016 -496 WIRE 2512 -480 2512 -496 WIRE 2864 -480 2864 -496 WIRE 2976 -480 2976 -496 WIRE 3136 -480 3136 -496 WIRE 2656 -464 2656 -496 WIRE 2688 -464 2656 -464 WIRE 2768 -464 2768 -496 WIRE 2768 -464 2736 -464 WIRE 2304 -416 2304 -496 WIRE 1760 -384 1760 -400 WIRE 2016 -384 2016 -400 WIRE 2016 -384 1888 -384 WIRE 2144 -384 2016 -384 WIRE 2512 -384 2512 -416 WIRE 2688 -384 2656 -384 WIRE 2768 -384 2736 -384 WIRE 2864 -384 2864 -416 WIRE 2976 -384 2976 -416 WIRE 3136 -384 3136 -400 WIRE 1888 -368 1888 -384 WIRE 2016 -352 2016 -384 WIRE 2656 -336 2656 -384 WIRE 2672 -336 2656 -336 WIRE 2768 -336 2768 -384 WIRE 2768 -336 2736 -336 WIRE 2768 -320 2768 -336 WIRE 2208 -304 2192 -304 WIRE 2304 -304 2304 -336 WIRE 2304 -304 2272 -304 WIRE 2512 -304 2304 -304 WIRE 1840 -288 1760 -288 WIRE 2656 -288 2656 -336 WIRE 1760 -256 1760 -288 WIRE 1888 -256 1888 -272 WIRE 2016 -256 2016 -272 WIRE 2304 -256 2304 -304 WIRE 2768 -240 2768 -256 WIRE 2144 -208 2144 -384 WIRE 2160 -208 2144 -208 WIRE 2608 -208 2448 -208 WIRE 2560 -160 2528 -160 WIRE 2656 -160 2656 -192 WIRE 2656 -160 2640 -160 WIRE 1760 -144 1760 -176 WIRE 2656 -144 2656 -160 WIRE 2080 -128 2064 -128 WIRE 2160 -128 2144 -128 WIRE 2464 -128 2448 -128 WIRE 2848 -112 2832 -112 WIRE 2944 -112 2928 -112 WIRE 2960 -112 2944 -112 WIRE 3072 -112 3072 -496 WIRE 3072 -112 3040 -112 WIRE 2000 -48 1968 -48 WIRE 2160 -48 2080 -48 WIRE 2528 -48 2528 -160 WIRE 2528 -48 2448 -48 WIRE 2656 -48 2656 -64 WIRE 2512 -16 2512 -304 WIRE 2896 -16 2512 -16 WIRE 2896 0 2896 -16 WIRE 2944 16 2944 -112 WIRE 2944 16 2928 16 WIRE 2048 32 2016 32 WIRE 2160 32 2128 32 WIRE 2832 32 2832 -112 WIRE 2832 32 2448 32 WIRE 2864 32 2832 32 WIRE 2960 48 2928 48 WIRE 3072 48 3040 48 WIRE 2304 80 2304 64 WIRE 2896 80 2896 64 FLAG 3072 48 0 FLAG 2896 80 0 FLAG 2304 80 0 FLAG 1760 -144 0 FLAG 2464 -128 0 FLAG 2656 -48 0 FLAG 1760 -384 0 FLAG 2864 -384 0 FLAG 2768 -240 0 FLAG 3136 -384 0 FLAG 1760 -496 IN FLAG 3136 -496 OUT FLAG 2976 -384 0 FLAG 2192 -304 0 FLAG 1888 -256 0 FLAG 1952 32 0 FLAG 1968 -48 0 FLAG 2064 -128 0 FLAG 2016 -256 0 FLAG 2512 -384 0 SYMBOL Opamps\\LT1797 2896 -32 M0 SYMATTR InstName U1 SYMBOL res 2944 -128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 5.1K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 3056 -128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 76.8K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res 3056 32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 4.75K SYMBOL PowerProducts\\LTC3805-5 2304 -96 R0 SYMATTR InstName U2 SYMBOL res 2000 -384 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R4 SYMATTR Value 100K SYMBOL res 2096 -64 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 75K SYMBOL cap 2144 -144 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 0.01n SYMBOL res 2144 16 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 20K SYMBOL cap 2016 16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL nmos 2608 -288 R0 WINDOW 3 68 88 Left 2 SYMATTR Value BSC059N04LS SYMATTR InstName Q1 SYMBOL res 2640 -160 R0 SYMATTR InstName R7 SYMATTR Value 0.005 SYMBOL ind2 2672 -368 M180 WINDOW 0 -3 70 Right 2 WINDOW 3 -2 41 Right 2 SYMATTR InstName L1 SYMATTR Value 4.7µ SYMATTR SpiceLine Rser=0.005 SYMBOL ind2 2752 -368 R180 WINDOW 0 -2 72 Right 2 WINDOW 3 1 43 Right 2 SYMATTR InstName L2 SYMATTR Value 4.7µ SYMATTR SpiceLine Rser=0.005 SYMBOL voltage 1760 -496 R0 WINDOW 123 24 138 Left 2 WINDOW 39 24 117 Left 2 SYMATTR Value 12 SYMATTR InstName V1 SYMBOL cap 2848 -480 R0 SYMATTR InstName C3 SYMATTR Value 20µ SYMATTR SpiceLine Rser=0.05 SYMBOL schottky 2752 -320 R0 SYMATTR Value PDS5100 SYMATTR InstName D1 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 2736 -352 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 100µ SYMATTR SpiceLine Rser=0.005 SYMBOL res 2288 -432 R0 SYMATTR InstName R8 SYMATTR Value 200 SYMBOL polcap 2960 -416 M180 WINDOW 0 24 57 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C5 SYMATTR Value 220µ SYMATTR SpiceLine Rser=0.02 SYMBOL res 2656 -176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 3.1K SYMBOL res 2000 -368 R0 SYMATTR InstName R10 SYMATTR Value 20.5K SYMBOL cap 2272 -320 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 4.7µ SYMBOL nmos 1840 -368 R0 WINDOW 3 60 72 Left 2 WINDOW 0 60 9 Left 2 SYMATTR Value 2N7002 SYMATTR InstName Q2 SYMBOL voltage 1760 -272 R0 WINDOW 123 24 138 Left 2 WINDOW 39 24 117 Left 2 SYMATTR Value PWL(0 0 2.0m 0 2.01m 5) SYMATTR InstName V2 SYMBOL res 3120 -496 R0 SYMATTR InstName Rload SYMATTR Value 4 SYMBOL cap 2496 -480 R0 SYMATTR InstName C7 SYMATTR Value 20µ SYMATTR SpiceLine Rser=0.05 TEXT 3160 80 Left 2 !.tran 3m TEXT 2704 -504 Bottom 2 !K L1 L2 1 TEXT 2496 -544 Bottom 2 ;LTC3805-5 - Adjustable Frequency Current Mode Flyback/ Boost/SEPIC DC/DC Controller\nLT1797 - 10MHz, Rail-to-Rail Input and Output Op Amp\nPositive-to-Negative Cuk Converter\nInput: 8V to 16V Output: -12V @ 3A TEXT 1792 112 Left 2 ;Notes: \n V2 is being used to enables converter for 2ms and then shuts it down.\n LT1797 is being used as a differential amplifier for sensing negative voltage; allowing reference control signals to use ground.\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 © 2013 Linear Technology Inc. All rights reserved.