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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Another design
Date: Fri, 10 May 2024 17:28:48 +0100
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On 10/05/2024 4:11 am, Edward Rawde wrote:
> "Edward Rawde" <invalid@invalid.invalid> wrote in message
> news:v1ho21$4ps$1@nnrp.usenet.blueworldhosting.com...
>> Now with 9V to 15V input range, direct gate drive and 500mA LED current.
>>
>> Startup behaviour is not ideal but maybe that can be fixed if it needs
>> fixing.
>>
>> What's the cheapest op amp I can use for U2 instead of OP07?
>>
>> Is there a cheaper comparator instead of LT1719 which will work?
>> Also the fet is bigger than it needs to ne.
>>
>> Is there a better device for D4? Particularly if R4 can be reduced.
>>
>> Will it work at all? Except in simulation.
>>
> 
> I think I've answered my own question for the current controller but I don't
> think it's feasible to attempt a discrete comparator on cost grounds.
> 
> Version 4
> SHEET 1 3044 680
> WIRE 2032 -272 64 -272
> WIRE 2192 -272 2032 -272
> WIRE 2480 -272 2192 -272
> WIRE 2192 -224 2192 -272
> WIRE 2480 -224 2480 -272
> WIRE 2336 -176 2256 -176
> WIRE 2416 -176 2336 -176
> WIRE 976 -128 160 -128
> WIRE 1072 -128 1040 -128
> WIRE 2032 -128 2032 -272
> WIRE 2192 -80 2192 -128
> WIRE 2336 -80 2336 -176
> WIRE 2336 -80 2192 -80
> WIRE 2480 -64 2480 -128
> WIRE 2688 -64 2480 -64
> WIRE 16 -48 -16 -48
> WIRE 64 -48 64 -272
> WIRE 64 -48 16 -48
> WIRE 96 -48 64 -48
> WIRE 240 -48 96 -48
> WIRE 336 -48 240 -48
> WIRE 448 -48 336 -48
> WIRE 464 -48 448 -48
> WIRE 528 -48 464 -48
> WIRE 608 -48 528 -48
> WIRE 672 -48 608 -48
> WIRE 784 -48 768 -48
> WIRE 816 -48 784 -48
> WIRE 864 -48 816 -48
> WIRE 992 -48 944 -48
> WIRE 1024 -48 992 -48
> WIRE 1072 -48 1072 -128
> WIRE 1072 -48 1024 -48
> WIRE 1264 -48 1072 -48
> WIRE 1360 -48 1264 -48
> WIRE 240 -16 240 -48
> WIRE 336 -16 336 -48
> WIRE 2192 -16 2192 -80
> WIRE 2480 -16 2480 -64
> WIRE 1264 0 1264 -48
> WIRE 1360 0 1360 -48
> WIRE -16 32 -16 -48
> WIRE 2128 32 1872 32
> WIRE 2592 32 2544 32
> WIRE 448 64 448 -48
> WIRE 464 64 464 -48
> WIRE 96 80 96 -48
> WIRE 160 80 160 -128
> WIRE 240 80 240 64
> WIRE 240 80 160 80
> WIRE 336 80 336 64
> WIRE 384 80 336 80
> WIRE 416 80 384 80
> WIRE 816 80 816 -48
> WIRE 992 80 992 -48
> WIRE 336 96 336 80
> WIRE 336 96 288 96
> WIRE 656 96 480 96
> WIRE 688 96 688 0
> WIRE 688 96 656 96
> WIRE 1264 96 1264 64
> WIRE 1312 96 1264 96
> WIRE 1936 96 1312 96
> WIRE 240 112 240 80
> WIRE 384 112 240 112
> WIRE 416 112 384 112
> WIRE 528 112 528 -48
> WIRE 608 112 608 -48
> WIRE 240 128 240 112
> WIRE 336 128 336 96
> WIRE 1360 128 1360 80
> WIRE 1424 128 1360 128
> WIRE 1872 128 1872 32
> WIRE 1872 128 1424 128
> WIRE 2192 128 2192 80
> WIRE 2352 128 2192 128
> WIRE 2480 128 2480 80
> WIRE 2480 128 2352 128
> WIRE 2032 144 2032 -48
> WIRE 2128 144 2032 144
> WIRE 1360 160 1360 128
> WIRE -16 176 -16 112
> WIRE 2032 192 2032 144
> WIRE 2352 192 2352 128
> WIRE 240 240 240 208
> WIRE 336 240 336 208
> WIRE 336 240 240 240
> WIRE 384 240 336 240
> WIRE 432 240 432 128
> WIRE 432 240 384 240
> WIRE 448 240 448 128
> WIRE 448 240 432 240
> WIRE 464 240 464 128
> WIRE 464 240 448 240
> WIRE 528 240 528 176
> WIRE 528 240 464 240
> WIRE 544 240 528 240
> WIRE 608 240 608 176
> WIRE 608 240 544 240
> WIRE 1360 240 1360 224
> WIRE 1424 240 1360 240
> WIRE 1536 240 1424 240
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> WIRE 1872 240 1760 240
> WIRE 2128 240 2128 144
> WIRE 2128 240 2096 240
> WIRE 2288 240 2128 240
> WIRE 544 272 544 240
> WIRE 1264 272 1264 96
> WIRE 1360 272 1360 240
> WIRE -16 368 -16 256
> WIRE 96 368 96 144
> WIRE 96 368 -16 368
> WIRE 544 368 544 352
> WIRE 544 368 96 368
> WIRE 816 368 816 144
> WIRE 816 368 544 368
> WIRE 992 368 992 144
> WIRE 992 368 816 368
> WIRE 1264 368 1264 352
> WIRE 1264 368 992 368
> WIRE 1360 368 1360 336
> WIRE 1360 368 1264 368
> WIRE 1872 368 1872 240
> WIRE 1872 368 1360 368
> WIRE 2032 368 2032 288
> WIRE 2032 368 1872 368
> WIRE 2352 368 2352 288
> WIRE 2352 368 2032 368
> WIRE -16 384 -16 368
> WIRE 1936 400 1936 96
> WIRE 2592 400 2592 32
> WIRE 2592 400 1936 400
> WIRE 288 448 288 96
> WIRE 992 448 288 448
> WIRE 1328 448 1072 448
> WIRE 2688 448 2688 -64
> WIRE 2688 448 1328 448
> FLAG -16 384 0
> FLAG 16 -48 in
> FLAG 784 -48 sw
> FLAG 1024 -48 out
> FLAG 1424 128 isense
> FLAG 1312 96 iref
> FLAG 1328 448 ifb
> FLAG 384 80 cmp-
> FLAG 384 112 cmp+
> FLAG 656 96 gate
> FLAG 384 240 cmpv-
> FLAG 1424 240 led
> SYMBOL Comparators\\LT1719 448 32 R0
> WINDOW 0 27 27 Left 2
> WINDOW 3 -92 6 Left 2
> SYMATTR InstName U1
> SYMBOL res 320 112 R0
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