Ta-da!

Demonstrate how.

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

YAY!

Standard education issue. If I simply give you the answer you'll never learn to think things thru yourself ;-)

I told you about "stack ratio" and asked WHERE are the ESD diodes and pointed you at the data sheet. Everything you need to know is there.

You beat the crap out of me when I missed a bit of information from a data sheet. Why doesn't the same treatment apply to you? Hmmmm?

Personally I don't think you'll _ever_ get it >:-) ...Jim Thompson

YAY! Too soon. It didn't take :-( ...Jim Thompson

You said it yourself: I beat the crap out of you. Keep posting stupid nonsense, and keep insulting my wife, and I'll keep doing it.

Quit smirking and demonstrate.

I bet you have a neon sign outside your building, "The great and wonderful John Larkin works here" ;-)

And you'll never "get it"... you lack the true engineering thinking processes to solve it... you're just a Tulane hacker ;-) ...Jim Thompson

On 10/7/2012 3:59 PM, Jim Thompson wrote:

I don't know for sure but guess that circuit is for the initial start up, until the flyback takes over. I have a circuit I made using a depletion mode fet too that works for this and has been built.

cheers, Jamie

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272 WIRE 576 272 576 224 WIRE 576 272 544 272 WIRE -176 288 -176 272 WIRE -96 288 -96 256 WIRE -96 288 -176 288 WIRE 176 304 176 256 WIRE 272 304 176 304 WIRE -160 320 -256 320 WIRE -32 320 -32 208 WIRE -32 320 -160 320 WIRE 80 320 80 192 WIRE 208 320 80 320 WIRE -16 336 -32 336 WIRE 656 352 656 320 WIRE 736 352 736 240 WIRE 736 352 656 352 WIRE 208 368 208 320 WIRE 272 368 208 368 WIRE -32 384 -32 336 WIRE -32 384 -80 384 WIRE -256 400 -256 320 WIRE 320 432 320 240 WIRE 480 432 320 432 WIRE 560 432 480 432 WIRE 736 432 736 352 WIRE 736 432 640 432 WIRE -160 448 -160 400 WIRE -160 448 -192 448 WIRE -80 448 -80 384 WIRE -80 448 -160 448 WIRE -160 464 -160 448 WIRE 736 464 736 432 WIRE 480 480 480 432 WIRE -256 512 -256 496 WIRE 320 592 320 432 WIRE 320 592 -256 592 WIRE -320 624 -320 304 WIRE -160 624 -160 528 WIRE -160 624 -320 624 WIRE 128 624 128 416 WIRE 128 624 -160 624 WIRE 480 624 480 544 WIRE 480 624 128 624 WIRE 736 624 736 544 WIRE 736 624 480 624 WIRE 128 672 128 624 WIRE -1648 1392 -1648 -1104 WIRE 1840 1392 1840 -1104 WIRE 1840 1392 -1648 1392 FLAG -656 -80 0 FLAG 496 80 0 FLAG 960 80 0 FLAG -48 -112 0 FLAG -1088 -96 0 FLAG 480 -32 vref FLAG -240 16 vref FLAG 208 64 0 FLAG 1168 112 0 FLAG 1376 144 0 FLAG 128 672 0 FLAG 352 -496 0 SYMBOL res -176 304 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res -336 48 R0 SYMATTR InstName R2 SYMATTR Value 33k SYMBOL res -336 208 R0 SYMATTR InstName R3 SYMATTR Value 4.7k SYMBOL res 656 416 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL cap -176 464 R0 SYMATTR InstName C1 SYMATTR Value 1.8n SYMBOL cap -112 192 R0 SYMATTR InstName C2 SYMATTR Value 100p SYMBOL res -192 176 R0 SYMATTR InstName R5 SYMATTR Value 150k SYMBOL res 720 448 R0 SYMATTR InstName R6 SYMATTR Value 0.5 SYMBOL cap 464 480 R0 SYMATTR InstName C3 SYMATTR Value 470p SYMBOL res 560 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 22 SYMBOL cap -672 -192 R0 SYMATTR InstName C4 SYMATTR Value 0.01µ SYMBOL ind2 720 -128 R0 SYMATTR InstName L1 SYMATTR Value 1mH SYMATTR Type ind SYMATTR SpiceLine Rser=1.1 Cpar=30p SYMBOL ind2 624 64 M180 WINDOW 0 36 80 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName L2 SYMATTR Value 28µH SYMATTR Type ind SYMATTR SpiceLine Rser=0.4 SYMBOL cap 192 -48 R0 SYMATTR InstName C6 SYMATTR Value 10µ SYMBOL ind2 880 64 R180 WINDOW 0 36 80 Left 0 WINDOW 3 49 40 Left 0 SYMATTR InstName L3 SYMATTR Value 28µH SYMATTR Type ind SYMATTR SpiceLine Rser=0.037 SYMBOL diode 944 -16 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D4 SYMATTR Value GSD2004W-V SYMBOL res -32 -272 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R10 SYMATTR Value 50K SYMBOL Xzener_DiodesInc -64 -176 M180 SYMATTR InstName U3 SYMATTR SpiceModel SMAZ16 SYMBOL schottky 528 176 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D3 SYMATTR Value 1N5819 SYMATTR Description Diode SYMATTR Type diode SYMBOL res -800 -336 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R14 SYMATTR Value 1 SYMBOL diode 608 -48 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D2 SYMATTR Value GSD2004W-V SYMBOL voltage -1088 -256 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 170 SYMBOL diode 400 -48 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D5 SYMATTR Value GSD2004W-V SYMBOL cap 496 -32 R0 SYMATTR InstName C7 SYMATTR Value 0.1µ SYMBOL nmos -96 -688 R0 SYMATTR InstName M1 SYMATTR Value DN2535 SYMBOL res -32 -448 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R8 SYMATTR Value 1K SYMBOL PowerProducts\\LT1246 128 272 R0 SYMATTR InstName U1 SYMBOL polcap 1152 0 R0 SYMATTR InstName C10 SYMATTR Value 100µ SYMBOL res 1360 0 R0 SYMATTR InstName R9 SYMATTR Value 15 SYMBOL nmos 688 144 R0 SYMATTR InstName M2 SYMATTR Value STP8NM60 SYMBOL schottky 672 320 R180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D1 SYMATTR Value 1N5819 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 624 128 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D6 SYMATTR Value 1N5819 SYMATTR Description Diode SYMATTR Type diode SYMBOL npn -192 400 M0 SYMATTR InstName Q1 SYMBOL res -272 496 R0 SYMATTR InstName R11 SYMATTR Value 1meg SYMBOL res 608 -304 R0 SYMATTR InstName R12 SYMATTR Value 100 SYMBOL cap 608 -176 R0 SYMATTR InstName C5 SYMATTR Value 0.047nF SYMBOL diode 144 -688 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D7 SYMATTR Value GSD2004W-V SYMBOL cap 336 -624 R0 SYMATTR InstName C8 SYMATTR Value 44µF TEXT -128 824 Left 0 !.tran 1000m startup TEXT 768 120 Left 0 !K L1 L2 L3 1 TEXT -1080 888 Left 0 !.options reltol=0.01 TEXT -1080 928 Left 0 !.options trtol=7 TEXT -1088 968 Left 0 !.options Gmin=1e-9 method=Gear TEXT -1080 792 Left 0 !.include supertex.lib TEXT -744 -840 Left 0 ;ICE components part#: TX08069 (100kHz flyback transformer 120VDC-170VDC input and 20VDC output@1200mA plus 20Vaux@50mA) TEXT -728 -776 Left 0 ;how can we get full 1200mA regulated output load? (our bias winding is 20V but our output sags at high current draw..)

I tried to upload a working zip file for the ltspice sim but can't with my new server, if anyone wants it I can send it via email.

cheers, Jamie

No wonder! When I looked at your results the first time I completely missed the notes below each graph. Everything is there as you say. Zooming in really helps. Sorry about that.