Version 4
SHEET 1 880 680
WIRE -288 -48 -512 -48
WIRE -128 -48 -288 -48
WIRE -48 -48 -128 -48
WIRE 224 -48 -48 -48
WIRE 480 -48 224 -48
WIRE 480 -16 480 -48
WIRE -288 0 -288 -48
WIRE -48 16 -48 -48
WIRE 224 48 224 -48
WIRE 336 96 288 96
WIRE 480 96 480 64
WIRE 480 96 416 96
WIRE -48 128 -48 80
WIRE -48 128 -112 128
WIRE -48 192 -48 128
WIRE 480 192 480 96
WIRE 224 208 224 144
WIRE 432 208 224 208
WIRE -288 272 -288 80
WIRE -96 272 -288 272
WIRE -512 304 -512 -48
WIRE -288 320 -288 272
WIRE 480 336 480 288
WIRE 544 336 480 336
WIRE -176 368 -224 368
WIRE -48 368 -48 288
WIRE -48 368 -96 368
WIRE -48 400 -48 368
WIRE 224 400 224 208
WIRE 480 400 480 336
WIRE -512 528 -512 384
WIRE -288 528 -288 416
WIRE -48 528 -48 480
WIRE 224 528 224 480
WIRE 480 528 480 464
FLAG -288 528 0
FLAG -48 528 0
FLAG -512 528 0
FLAG 224 528 0
FLAG 480 528 0
FLAG 544 336 Uc2
FLAG -112 128 Uc1
FLAG -128 -48 Ub
SYMBOL nmos -96 192 R0
SYMATTR InstName M1
SYMATTR Value BSB012N03LX3
SYMBOL res -64 384 R0
SYMATTR InstName R1
SYMATTR Value 1
SYMBOL npn -224 320 M0
SYMATTR InstName Q1
SYMBOL res -304 -16 R0
SYMATTR InstName R2
SYMATTR Value 4k7
SYMBOL cap -64 16 R0
SYMATTR InstName C1
SYMATTR Value 200µ ic=0
SYMBOL voltage -512 288 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 48V
SYMBOL res -80 352 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL pmos 432 288 M180
SYMATTR InstName M2
SYMATTR Value FDC638P
SYMBOL cap 464 400 R0
SYMATTR InstName C2
SYMATTR Value 200µ ic=0
SYMBOL res 464 -32 R0
SYMATTR InstName R4
SYMATTR Value 1
SYMBOL res 208 384 R0
SYMATTR InstName R5
SYMATTR Value 4k7
SYMBOL pnp 288 144 R180
SYMATTR InstName Q2
SYMBOL res 432 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1k
TEXT -546 552 Left 2 !.tran 100m