On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" <harryd@tdsystems.org> wrote:> >"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in message >> >> I like these schmitt-trigger switchers. You get to turn all the knobs >> yourself. >> >Here is Jl's PSU suitable for production. Note the rise and fall times have >been soften. > >Where's the sport in using some expensive fancy-pants switcher controller chip? It just needs a little tweaking. https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
New Improved +/-45V PSU
Started by ●July 18, 2013
Reply by ●July 22, 20132013-07-22
Reply by ●July 22, 20132013-07-22
"John Larkin" <jlarkin@highlandtechnology.com> wrote in message news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com...> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" > <harryd@tdsystems.org> wrote: > >> >>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>message >>> >>> I like these schmitt-trigger switchers. You get to turn all the knobs >>> yourself. >>> >>Here is Jl's PSU suitable for production. Note the rise and fall times >>have >>been soften. >> >> > > Where's the sport in using some expensive fancy-pants switcher > controller chip? > > It just needs a little tweaking. > > https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc > > > > > -- > > John Larkin Highland Technology, Inc >That is Ok for a bench top tweak but will not make it in the production world. Your efficiency is poor due to 750KHz operation. C4 can be replaced with a short and D4 removed. C1,6 need be <1.0uF M1 can be your pilot light! Cheers, Harry
Reply by ●July 22, 20132013-07-22
On Mon, 22 Jul 2013 16:10:18 -0700, "Harry Dellamano" <harryd@tdsystems.org> wrote:> >"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com... >> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" >> <harryd@tdsystems.org> wrote: >> >>> >>>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>>message >>>> >>>> I like these schmitt-trigger switchers. You get to turn all the knobs >>>> yourself. >>>> >>>Here is Jl's PSU suitable for production. Note the rise and fall times >>>have >>>been soften. >>> >>> >> >> Where's the sport in using some expensive fancy-pants switcher >> controller chip? >> >> It just needs a little tweaking. >> >> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc >> >> >> >> >> -- >> >> John Larkin Highland Technology, Inc >> > That is Ok for a bench top tweak but will not make it in the production >world. > Your efficiency is poor due to 750KHz operation. > C4 can be replaced with a short and D4 removed. C1,6 need be <1.0uF > M1 can be your pilot light! > > Cheers, Harry >Pilot light power provided by the dumping current of C4 ;-) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●July 22, 20132013-07-22
On Mon, 22 Jul 2013 16:10:18 -0700, "Harry Dellamano" <harryd@tdsystems.org> wrote:> >"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com... >> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" >> <harryd@tdsystems.org> wrote: >> >>> >>>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>>message >>>> >>>> I like these schmitt-trigger switchers. You get to turn all the knobs >>>> yourself. >>>> >>>Here is Jl's PSU suitable for production. Note the rise and fall times >>>have >>>been soften. >>> >>> >> >> Where's the sport in using some expensive fancy-pants switcher >> controller chip? >> >> It just needs a little tweaking. >> >> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc >> >> >> >> >> -- >> >> John Larkin Highland Technology, Inc >> > That is Ok for a bench top tweak but will not make it in the production >world.Why not? I've done schmitt switchers several times, and have a new one in the oven; should be running next week. The breadboard works fine. Breadboard: https://dl.dropboxusercontent.com/u/53724080/Protos/BB_Boost1.JPG PCB: https://dl.dropboxusercontent.com/u/53724080/PCBs/D14.jpg The schmitt boost converter occupies about half of this board. I've had enough weird behavior with complicated LTC switchers that I'd rather roll my own.> Your efficiency is poor due to 750KHz operation.It's easily changed. All you need to do is apply money and buy a bigger inductor.> C4 can be replaced with a short and D4 removed.Yes, if you don't mind the inrush current. C1,6 need be <1.0uF> M1 can be your pilot light!M1 is only dissipating about 140 mw, and it's still not optimized. LT Spice has only a limited selection of mosfets, most too big. -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Reply by ●July 22, 20132013-07-22
"John Larkin" <jlarkin@highlandtechnology.com> wrote in message news:1mfru850k5agg0ee9ivl3e42m1io48qvdo@4ax.com...> On Mon, 22 Jul 2013 16:10:18 -0700, "Harry Dellamano" > <harryd@tdsystems.org> wrote: > >> >>"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >>news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com... >>> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" >>> <harryd@tdsystems.org> wrote: >>> >>>> >>>>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>>>message >>>>> >>>>> I like these schmitt-trigger switchers. You get to turn all the knobs >>>>> yourself. >>>>> >>>>Here is Jl's PSU suitable for production. Note the rise and fall times >>>>have >>>>been soften. >>>> >>>> >>> >>> Where's the sport in using some expensive fancy-pants switcher >>> controller chip? >>> >>> It just needs a little tweaking. >>> >>> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc >>> >>> >>> >>> >>> -- >>> >>> John Larkin Highland Technology, Inc >>> >> That is Ok for a bench top tweak but will not make it in the production >>world. > > > Why not? I've done schmitt switchers several times, and have a new one > in the oven; should be running next week. The breadboard works fine. > > Breadboard: > > https://dl.dropboxusercontent.com/u/53724080/Protos/BB_Boost1.JPG > > PCB: > > https://dl.dropboxusercontent.com/u/53724080/PCBs/D14.jpg > > The schmitt boost converter occupies about half of this board. > > I've had enough weird behavior with complicated LTC switchers that I'd > rather roll my own. > >> Your efficiency is poor due to 750KHz operation. > > It's easily changed. All you need to do is apply money and buy a > bigger inductor. > >> C4 can be replaced with a short and D4 removed. > > Yes, if you don't mind the inrush current. > > C1,6 need be <1.0uF >> M1 can be your pilot light! > > M1 is only dissipating about 140 mw, and it's still not optimized. LT > Spice has only a limited selection of mosfets, most too big. > > > -- > > John Larkin Highland Technology, Inc >So what magic Smitt-Trigger IC do you use that operates in this unit over temp and lot to lot? I admit that I use lots of ST but not in apps. like this. Looks like something JF would use with his 555s. Harry
Reply by ●July 22, 20132013-07-22
On Mon, 22 Jul 2013 17:08:48 -0700, "Harry Dellamano" <harryd@tdsystems.org> wrote:> >"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >news:1mfru850k5agg0ee9ivl3e42m1io48qvdo@4ax.com... >> On Mon, 22 Jul 2013 16:10:18 -0700, "Harry Dellamano" >> <harryd@tdsystems.org> wrote: >> >>> >>>"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >>>news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com... >>>> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" >>>> <harryd@tdsystems.org> wrote: >>>> >>>>> >>>>>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>>>>message >>>>>> >>>>>> I like these schmitt-trigger switchers. You get to turn all the knobs >>>>>> yourself. >>>>>> >>>>>Here is Jl's PSU suitable for production. Note the rise and fall times >>>>>have >>>>>been soften. >>>>> >>>>> >>>> >>>> Where's the sport in using some expensive fancy-pants switcher >>>> controller chip? >>>> >>>> It just needs a little tweaking. >>>> >>>> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> John Larkin Highland Technology, Inc >>>> >>> That is Ok for a bench top tweak but will not make it in the production >>>world. >> >> >> Why not? I've done schmitt switchers several times, and have a new one >> in the oven; should be running next week. The breadboard works fine. >> >> Breadboard: >> >> https://dl.dropboxusercontent.com/u/53724080/Protos/BB_Boost1.JPG >> >> PCB: >> >> https://dl.dropboxusercontent.com/u/53724080/PCBs/D14.jpg >> >> The schmitt boost converter occupies about half of this board. >> >> I've had enough weird behavior with complicated LTC switchers that I'd >> rather roll my own. >> >>> Your efficiency is poor due to 750KHz operation. >> >> It's easily changed. All you need to do is apply money and buy a >> bigger inductor. >> >>> C4 can be replaced with a short and D4 removed. >> >> Yes, if you don't mind the inrush current. >> >> C1,6 need be <1.0uF >>> M1 can be your pilot light! >> >> M1 is only dissipating about 140 mw, and it's still not optimized. LT >> Spice has only a limited selection of mosfets, most too big. >> >> >> -- >> >> John Larkin Highland Technology, Inc >> > So what magic Smitt-Trigger IC do you use that operates in this unit over >temp and lot to lot? > I admit that I use lots of ST but not in apps. like this. Looks like >something JF would use with his 555s. > > Harry > > >I thought of posting a 555 version just to annoy Slowman ;-) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●July 22, 20132013-07-22
"John Larkin" <jlarkin@highlandtechnology.com> wrote in message news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com...> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" > <harryd@tdsystems.org> wrote: > >> >>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>message >>> >>> I like these schmitt-trigger switchers. You get to turn all the knobs >>> yourself. >>> >>Here is Jl's PSU suitable for production. Note the rise and fall times >>have >>been soften. >> >> > > Where's the sport in using some expensive fancy-pants switcher > controller chip? > > It just needs a little tweaking. > > https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc > > > > > -- > > John Larkin Highland Technology, Inc >Expensive fancy pants switcher, 0.24 USD/1K http://www.digikey.com/product-detail/en/UC3842BD1G/UC3842BD1GOS-ND/921708 Harry
Reply by ●July 22, 20132013-07-22
On Mon, 22 Jul 2013 17:08:48 -0700, "Harry Dellamano" <harryd@tdsystems.org> wrote:> >"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >news:1mfru850k5agg0ee9ivl3e42m1io48qvdo@4ax.com... >> On Mon, 22 Jul 2013 16:10:18 -0700, "Harry Dellamano" >> <harryd@tdsystems.org> wrote: >> >>> >>>"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >>>news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com... >>>> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" >>>> <harryd@tdsystems.org> wrote: >>>> >>>>> >>>>>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>>>>message >>>>>> >>>>>> I like these schmitt-trigger switchers. You get to turn all the knobs >>>>>> yourself. >>>>>> >>>>>Here is Jl's PSU suitable for production. Note the rise and fall times >>>>>have >>>>>been soften. >>>>> >>>>> >>>> >>>> Where's the sport in using some expensive fancy-pants switcher >>>> controller chip? >>>> >>>> It just needs a little tweaking. >>>> >>>> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> John Larkin Highland Technology, Inc >>>> >>> That is Ok for a bench top tweak but will not make it in the production >>>world. >> >> >> Why not? I've done schmitt switchers several times, and have a new one >> in the oven; should be running next week. The breadboard works fine. >> >> Breadboard: >> >> https://dl.dropboxusercontent.com/u/53724080/Protos/BB_Boost1.JPG >> >> PCB: >> >> https://dl.dropboxusercontent.com/u/53724080/PCBs/D14.jpg >> >> The schmitt boost converter occupies about half of this board. >> >> I've had enough weird behavior with complicated LTC switchers that I'd >> rather roll my own. >> >>> Your efficiency is poor due to 750KHz operation. >> >> It's easily changed. All you need to do is apply money and buy a >> bigger inductor. >> >>> C4 can be replaced with a short and D4 removed. >> >> Yes, if you don't mind the inrush current. >> >> C1,6 need be <1.0uF >>> M1 can be your pilot light! >> >> M1 is only dissipating about 140 mw, and it's still not optimized. LT >> Spice has only a limited selection of mosfets, most too big. >> >> >> -- >> >> John Larkin Highland Technology, Inc >> > So what magic Smitt-Trigger IC do you use that operates in this unit over >temp and lot to lot?NC7WZ17 dual, 5 cents, and I'm only using half here. I've done it with schmitt gate drivers too, like LM5112. The schmitt thresholds are plenty stable for a switcher like this. The operating range is from the upper switch threshold down to close to ground, so the specified hysteresis doesn't itself matter.> I admit that I use lots of ST but not in apps. like this. Looks like >something JF would use with his 555s.I've sold zillions of things like this. No problems. I *have* had a nunber of problems with a couple of the LTC parts; weird startups, subcycle oscillation, failures, latchups, model inaccuracies. Not to mention cost. You hacked around an LTC part pretty seriously so have created even more complexity hence potential hazards. The schmitt thing is elegantly simple. John -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Reply by ●July 22, 20132013-07-22
On Mon, 22 Jul 2013 17:53:19 -0700, "Harry Dellamano" <harryd@tdsystems.org> wrote:> >"John Larkin" <jlarkin@highlandtechnology.com> wrote in message >news:ldcru85rit76em33h6tavqhnii3khefh0c@4ax.com... >> On Mon, 22 Jul 2013 12:29:04 -0700, "Harry Dellamano" >> <harryd@tdsystems.org> wrote: >> >>> >>>"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in >>>message >>>> >>>> I like these schmitt-trigger switchers. You get to turn all the knobs >>>> yourself. >>>> >>>Here is Jl's PSU suitable for production. Note the rise and fall times >>>have >>>been soften. >>> >>> >> >> Where's the sport in using some expensive fancy-pants switcher >> controller chip? >> >> It just needs a little tweaking. >> >> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/JL_PS2.asc >> >> >> >> >> -- >> >> John Larkin Highland Technology, Inc >> > > Expensive fancy pants switcher, 0.24 USD/1K > >http://www.digikey.com/product-detail/en/UC3842BD1G/UC3842BD1GOS-ND/921708 > > Harry > > > >Your suitable-for-production circuit used LT1242, $1.95 at 1K. Plus a bunch of other parts. The UC3842 still needs a bunch of added parts... as many as 12 in some of the datasheet examples, not even including the inductor/diodes/filter caps. -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Reply by ●July 23, 20132013-07-23
On 23/07/13 02.53, Harry Dellamano wrote: ...> Expensive fancy pants switcher, 0.24 USD/1K > > http://www.digikey.com/product-detail/en/UC3842BD1G/UC3842BD1GOS-ND/921708 > > HarryThis series replaced UC384x "long" ago: ucc3802 til 100% 0,5mA http://focus.ti.com/docs/prod/folders/print/ucc3802.html 2,1 eu http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-11464-5-ND ->ucc3803 til 100% 0,5mA 2,1 eu http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-11466-5-ND ->ucc3800 til 100% 0,5mA 2,1 eu http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-11457-5-ND Also these - but they are also outdated: ( UCC38C43 MIC38HC43 MIC38HC43-1 MIC38C44 SG3843 KA3843 ISL8843 TL3843 ISL8843 ) /Glenn
