This looks like I can use this as the driver section, the clock rate will be coming from another circuit, that will have the Peak On Pulse width and RUN pulse width that we can set. I will be inserting a current monitor for that.
I tried this with 2 MosFets only and I was able to get symmetric current in the supply. Current coming out and equal current going back in however, I had what looked like oscillation at the edges of each cycle.
PMos was inverted from the signal while the NMOS was driven directly. There was no gate ringing, I placed R's all over and could not remove it completely. So I came up with a slightly moded version of it however, I don't see the energy return as symmetric any more but it does look good.
Please take a look please, must be something I am doing to slow down the off cycle or, bad selection of parts ?
Version 4 SHEET 1 880 680 WIRE 0 32 0 16 WIRE 0 32 -128 32 WIRE 272 32 96 32 WIRE 384 32 272 32 WIRE 480 32 448 32 WIRE 480 48 480 32 WIRE 272 80 272 32 WIRE -128 128 -128 112 WIRE 96 192 96 160 WIRE 176 192 96 192 WIRE 192 192 176 192 WIRE 272 192 272 160 WIRE 272 192 256 192 WIRE 176 208 176 192 WIRE 272 224 272 192 WIRE 16 256 16 80 WIRE 16 256 -128 256 WIRE 112 256 96 256 WIRE -128 288 -128 256 WIRE 192 304 176 304 WIRE 224 304 192 304 WIRE 192 320 192 304 WIRE 192 320 160 320 WIRE -128 384 -128 368 WIRE 160 416 160 400 WIRE 272 416 272 320 FLAG -128 384 0 FLAG 0 16 P+ FLAG -128 128 0 FLAG 96 160 P+ FLAG 480 48 0 FLAG 160 416 0 FLAG 272 416 0 FLAG 400 128 Injector SYMBOL ind 256 64 R0 WINDOW 3 36 63 Left 2 SYMATTR InstName L1 SYMATTR Value 10mh SYMATTR SpiceLine Rser=1 SYMBOL Misc\\signal -128 272 R0 WINDOW 3 -100 179 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PULSE(0 12 0 100us 100us 2000us 8000us 1000) SYMBOL voltage -128 16 R0 WINDOW 0 -43 -12 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 24 132 Left 2 SYMATTR InstName V2 SYMATTR Value 12 SYMATTR SpiceLine Rser=.5 SYMBOL diode 256 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 -56 51 VTop 2 SYMATTR InstName D2 SYMATTR Value MUR460 SYMBOL diode 448 16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value MUR460 SYMBOL pmos 96 80 M270 SYMATTR InstName M1 SYMATTR Value FDS4953 SYMBOL pnp 112 304 M180 WINDOW 0 44 30 Left 2 WINDOW 3 41 59 Left 2 SYMATTR InstName Q2 SYMBOL res 112 240 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 47k SYMBOL res 144 304 R0 SYMATTR InstName R1 SYMATTR Value 470 SYMBOL nmos 224 224 R0 SYMATTR InstName M2 SYMATTR Value FDR4420A TEXT -216 -88 Left 0 !.tran 0 0.050 0 startup
Jamie