On Mon, 29 Jun 2015 18:47:14 -0400, DecadentLinuxUserNumeroUno wrote:
Only when you curse and rant. I occasionally engage you on technical issues without personal comment. I do that for anyone who seriously wants to discuss electronics. When people turn a technical discussion personal by starting insults, things tend to run away.
Rickman's default is to add insults. So is yours.
I can't help people changing my circuits. I posted a couple of versions, before and after lunch, and the "after" started up a little nicer. I'm not too concerned about startup beauty. Output ripple doesn't matter much in the application at hand, but it would be easy to add more output capacitance if it did matter. That would need to be a HV cap.
I kinda like this one. It uses a cheap stock Coiltronics dual-winding inductor as an autotransformer. Those dual Ls are probably wound bifalar and have very low leakage inductance. Autotransformer boosts are not common and have some nice properties.
It might need a soft start. It has 3.5 volts p-p ripple on the 1200 volt output at 2 mA load.
Version 4 SHEET 1 2184 704 WIRE 1248 -608 1184 -608 WIRE 1376 -608 1312 -608 WIRE 1440 -608 1376 -608 WIRE 1568 -608 1504 -608 WIRE 1376 -576 1376 -608 WIRE 1024 -432 944 -432 WIRE 1184 -432 1184 -608 WIRE 1184 -432 1088 -432 WIRE 1248 -432 1184 -432 WIRE 1344 -432 1312 -432 WIRE 1376 -432 1376 -512 WIRE 1376 -432 1344 -432 WIRE 1440 -432 1376 -432 WIRE 1568 -432 1568 -608 WIRE 1568 -432 1504 -432 WIRE 1184 -400 1184 -432 WIRE 1376 -400 1376 -432 WIRE 784 -272 720 -272 WIRE 944 -272 944 -432 WIRE 944 -272 848 -272 WIRE 1040 -272 944 -272 WIRE 1184 -272 1184 -336 WIRE 1184 -272 1104 -272 WIRE 1248 -272 1184 -272 WIRE 1376 -272 1376 -336 WIRE 1376 -272 1248 -272 WIRE 1568 -272 1568 -432 WIRE 1568 -272 1520 -272 WIRE 1184 -240 1184 -272 WIRE 1568 -240 1568 -272 WIRE 944 -224 944 -272 WIRE 0 -208 -96 -208 WIRE 144 -208 64 -208 WIRE -96 -112 -96 -208 WIRE -16 -112 -96 -112 WIRE 144 -112 144 -208 WIRE 144 -112 64 -112 WIRE 240 -112 144 -112 WIRE 288 -112 240 -112 WIRE 496 -112 288 -112 WIRE 720 -112 720 -272 WIRE 720 -112 576 -112 WIRE 784 -112 720 -112 WIRE 944 -112 944 -160 WIRE 944 -112 848 -112 WIRE 1088 -112 944 -112 WIRE 1184 -112 1184 -176 WIRE 1184 -112 1088 -112 WIRE 1264 -112 1184 -112 WIRE 1312 -112 1264 -112 WIRE 1568 -112 1568 -160 WIRE 288 -64 288 -112 WIRE 496 -64 496 -112 WIRE 576 -64 576 -112 WIRE -96 -48 -96 -112 WIRE 144 -48 144 -112 WIRE 1088 -32 1088 -112 WIRE 1184 -32 1184 -112 WIRE -96 64 -96 32 WIRE -16 64 -96 64 WIRE 144 64 144 32 WIRE 144 64 48 64 WIRE 288 64 288 0 WIRE 336 64 288 64 WIRE 496 64 496 16 WIRE 496 64 416 64 WIRE 576 64 576 16 WIRE 576 64 496 64 WIRE 624 64 576 64 WIRE 656 64 624 64 WIRE 1088 96 1088 32 WIRE 1184 96 1184 48 WIRE -96 112 -96 64 WIRE 576 112 576 64 WIRE 944 112 944 -112 WIRE 144 144 144 64 WIRE 352 192 272 192 WIRE 480 192 432 192 WIRE 528 192 480 192 WIRE 944 240 944 192 WIRE 944 240 720 240 WIRE -128 256 -176 256 WIRE 16 256 -48 256 WIRE 352 256 272 256 WIRE 480 256 432 256 WIRE 576 256 576 208 WIRE 576 256 480 256 WIRE 576 288 576 256 WIRE 944 304 944 240 WIRE -176 320 -176 256 WIRE 304 320 272 320 WIRE 576 400 576 368 WIRE -176 432 -176 384 WIRE 144 432 144 368 WIRE 944 432 944 384 WIRE 304 448 304 320 WIRE 480 448 304 448 WIRE 720 448 720 240 WIRE 720 448 480 448 FLAG 144 432 0 FLAG 576 400 0 FLAG 1088 96 0 FLAG 1184 96 0 FLAG -176 432 0 FLAG 1264 -112 HV1 FLAG 944 432 0 FLAG 240 -112 IN FLAG -96 112 0 FLAG 1568 -112 0 FLAG 1248 -272 HV2 FLAG 1344 -432 HV3 FLAG 1520 -272 HV4 FLAG 624 64 QD FLAG 480 192 QG FLAG 480 256 QS FLAG 480 448 FB SYMBOL PowerProducts\\LTC3803 144 256 R0 SYMATTR InstName U1 SYMBOL ind2 480 -80 R0 WINDOW 0 -17 36 Right 2 WINDOW 3 -8 71 Right 2 SYMATTR InstName L1
SYMATTR Type ind SYMATTR SpiceLine Ipk=3.0 Rser=0.01 Cpar=1pF SYMBOL ind2 592 32 R180 WINDOW 0 -22 77 Right 2 WINDOW 3 -12 42 Right 2 SYMATTR InstName L2
SYMATTR Type ind SYMATTR SpiceLine Ipk=20 Rser=1m Cpar=2pF SYMBOL nmos 528 112 R0 WINDOW 0 114 48 Left 2 WINDOW 3 75 84 Left 2 SYMATTR InstName Q1 SYMATTR Value Si9420DY SYMBOL res 560 272 R0 WINDOW 0 66 54 Left 2 WINDOW 3 48 88 Left 2 SYMATTR InstName R1 SYMATTR Value 100m SYMBOL res 128 -64 R0 WINDOW 0 -50 33 Left 2 WINDOW 3 -52 64 Left 2 SYMATTR InstName R2 SYMATTR Value 1K SYMBOL res 928 208 M180 WINDOW 0 -97 78 Left 2 WINDOW 3 -126 43 Left 2 SYMATTR InstName R3 SYMATTR Value 7Meg SYMBOL res 928 400 M180 WINDOW 0 -74 64 Left 2 WINDOW 3 -80 31 Left 2 SYMATTR InstName R4 SYMATTR Value 20K SYMBOL cap 1072 -32 R0 WINDOW 0 -61 25 Left 2 WINDOW 3 -64 58 Left 2 SYMATTR InstName C1 SYMATTR Value 66n SYMATTR SpiceLine Rser=10m SYMBOL res -32 240 R90 WINDOW 0 -42 60 VBottom 2 WINDOW 3 -39 58 VTop 2 SYMATTR InstName R5 SYMATTR Value 20K SYMBOL cap -160 384 R180 WINDOW 0 -112 43 Left 2 WINDOW 3 -85 8 Left 2 SYMATTR InstName Ccomp SYMATTR Value 10n SYMBOL voltage -96 -64 R0 WINDOW 123 -220 84 Left 2 WINDOW 0 -83 44 Left 2 WINDOW 3 -79 81 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 24 SYMBOL res 1168 -48 R0 WINDOW 0 63 38 Left 2 WINDOW 3 64 71 Left 2 SYMATTR InstName R250 SYMATTR Value 250K SYMATTR SpiceLine pwr=12 SYMBOL res -32 -96 R270 WINDOW 0 43 61 VTop 2 WINDOW 3 -9 58 VBottom 2 SYMATTR InstName Rmon SYMATTR Value 1m SYMBOL cap 64 -224 R90 WINDOW 0 -47 29 VBottom 2 WINDOW 3 -40 30 VTop 2 SYMATTR InstName C4 SYMATTR Value 20m SYMBOL diode 784 -96 R270 WINDOW 0 -31 30 VTop 2 WINDOW 3 -32 31 VBottom 2 SYMATTR InstName D2 SYMBOL diode 960 -160 R180 WINDOW 0 56 41 Left 2 WINDOW 3 64 9 Left 2 SYMATTR InstName D1 SYMBOL cap 784 -256 R270 WINDOW 0 111 33 VTop 2 WINDOW 3 104 34 VBottom 2 SYMATTR InstName C6 SYMATTR Value 22n SYMBOL cap 1200 -176 R180 WINDOW 0 -59 45 Left 2 WINDOW 3 -65 15 Left 2 SYMATTR InstName C7 SYMATTR Value 22n SYMBOL diode 1040 -256 R270 WINDOW 0 72 33 VTop 2 WINDOW 3 67 33 VBottom 2 SYMATTR InstName D3 SYMBOL res 1552 -256 R0 WINDOW 0 -119 60 Left 2 WINDOW 3 -116 97 Left 2 SYMATTR InstName R1200 SYMATTR Value 600K SYMBOL diode 1200 -336 R180 WINDOW 0 58 38 Left 2 WINDOW 3 63 6 Left 2 SYMATTR InstName D4 SYMBOL cap 1392 -336 R180 WINDOW 0 44 0 Left 2 WINDOW 3 36 -31 Left 2 SYMATTR InstName C5 SYMATTR Value 22n SYMBOL diode 1248 -416 R270 WINDOW 0 -34 31 VTop 2 WINDOW 3 -37 31 VBottom 2 SYMATTR InstName D5 SYMBOL cap 1024 -416 R270 WINDOW 0 77 32 VTop 2 WINDOW 3 71 33 VBottom 2 SYMATTR InstName C8 SYMATTR Value 22n SYMBOL diode 1392 -512 R180 WINDOW 0 -37 -6 Left 2 WINDOW 3 -27 -35 Left 2 SYMATTR InstName D6 SYMBOL cap 1440 -416 R270 WINDOW 0 -39 32 VTop 2 WINDOW 3 -49 30 VBottom 2 SYMATTR InstName C9 SYMATTR Value 22n SYMBOL diode 1440 -592 R270 WINDOW 0 -31 30 VTop 2 WINDOW 3 -32 31 VBottom 2 SYMATTR InstName D7 SYMBOL cap 1248 -592 R270 WINDOW 0 -38 33 VTop 2 WINDOW 3 -43 34 VBottom 2 SYMATTR InstName C10 SYMATTR Value 22n SYMBOL res 448 240 R90 WINDOW 0 68 52 VBottom 2 WINDOW 3 75 53 VTop 2 SYMATTR InstName R7 SYMATTR Value 5K SYMBOL res 448 176 R90 WINDOW 0 -44 52 VBottom 2 WINDOW 3 -37 53 VTop 2 SYMATTR InstName R8 SYMATTR Value 33 SYMBOL res 432 48 R90 WINDOW 0 -40 54 VBottom 2 WINDOW 3 -33 55 VTop 2 SYMATTR InstName R6 SYMATTR Value 1K SYMBOL cap 272 -64 R0 WINDOW 0 -45 20 Left 2 WINDOW 3 -43 48 Left 2 SYMATTR InstName C3 SYMATTR Value 47p SYMBOL cap 48 48 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C11
TEXT 536 -160 Bottom 2 !K1 L1 L2 1 TEXT 216 -408 Left 2 !.tran 12ms startup TEXT 472 -224 Left 2 ;DRQ127 1:1 TEXT 736 272 Left 2 ;0.8V TEXT 992 -224 Left 2 ;MMBD5004 TEXT 112 -472 Left 2 ;HV SUPPLY J LARKIN June 29, 2015 TEXT 792 -312 Left 2 ;500V