On Wed, 15 Feb 2023 14:00:20 -0800 (PST), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>onsdag den 15. februar 2023 kl. 22.49.51 UTC+1 skrev John Larkin: >> On Wed, 15 Feb 2023 13:25:20 -0800 (PST), Lasse Langwadt Christensen >> <lang...@fonz.dk> wrote: >> >> >onsdag den 15. februar 2023 kl. 21.58.26 UTC+1 skrev John Larkin: >> >> On Wed, 15 Feb 2023 12:26:04 -0800 (PST), Lasse Langwadt Christensen >> >> <lang...@fonz.dk> wrote: >> >> >> >> >onsdag den 15. februar 2023 kl. 21.16.01 UTC+1 skrev John Larkin: >> >> >> On Wed, 15 Feb 2023 18:30:57 +0100, Klaus Vestergaard Kragelund >> >> >> <klau...@hotmail.com> wrote: >> >> >> >> >> >> >On 15-02-2023 17:45, John Larkin wrote: >> >> >> >> https://www.dropbox.com/s/0h88ikjnbxcisl3/CUI_PXO_DC-DC.jpg?raw=1 >> >> >> >> >> >> >> >> https://www.mouser.com/ProductDetail/CUI-Inc/PXO7805-500-S?qs=Y0Uzf4wQF3l34%252B7eogTBxw%3D%3D >> >> >> >> >> >> >> >> This is the 5 volt out version but there are others. It can also >> >> >> >> convert plus to minus. >> >> >> >> >> >> >> >> I can't buy the parts for three times that price. >> >> >> >> >> >> >> >Nice switcher, yes. >> >> >> > >> >> >> >Can you see the part number of the switcher IC? (would be interesting)' >> >> >> It's marked 1301 G7 >> >> >> > >> >> >> >By the way, notice that the output ripple below 20% load is a whopping >> >> >> >300mVpp. Normally one would like to have that well below 100mVpp >> >> >> It needs added external caps, no big deal. >> >> >> >> >> >> I do plan to test them and learn more about actual behavior. It >> >> >> appears to be not a synchronous switcher. >> >> > >> >> >https://www.mornsun-power.com/public/uploads/pdf/SCM1301A.pdf maybe? >> >> That must be it. 700 KHz is right. >> >> >> >> If I do my own regs, I'd use the TI TPS54302 family parts, >> >> spread-spectrum synchronous switchers. >> > >> >nice, JLC has plenty in stock, you could probably have a board for $0.5 >> > >> >https://jlcpcb.com/partdetail/TexasInstruments-TPS54302DDCR/C311983 >> >https://jlcpcb.com/partdetail/Cenker-CKST0603_10uHM/C3002639 >> >https://jlcpcb.com/partdetail/14236-CL31A106KBHNNNE/C13585 >> How can they sell them for 18 cents, when we are paying 61? > >you are buying them the wrong place?Direct from TI.
nice little switcher
Started by ●February 15, 2023
Reply by ●February 15, 20232023-02-15
Reply by ●February 16, 20232023-02-16
On a sunny day (Wed, 15 Feb 2023 08:45:29 -0800) it happened John Larkin <jlarkin@highlandSNIPMEtechnology.com> wrote in <7p2quhtbpt470mo9alapqos7a7dhocq0al@4ax.com>:>https://www.dropbox.com/s/0h88ikjnbxcisl3/CUI_PXO_DC-DC.jpg?raw=1 > >https://www.mouser.com/ProductDetail/CUI-Inc/PXO7805-500-S?qs=Y0Uzf4wQF3l34%252B7eogTBxw%3D%3D > >This is the 5 volt out version but there are others. It can also >convert plus to minus. > >I can't buy the parts for three times that price.Yes, ebay stuff from China, I have some of these: https://www.ebay.com/itm/112855472220
Reply by ●February 16, 20232023-02-16
On a sunny day (Thu, 16 Feb 2023 01:21:10 +0100) it happened Klaus Vestergaard Kragelund <klauskvik@hotmail.com> wrote in <tsjstm$31bkt$2@dont-email.me>:>On 15-02-2023 21:15, John Larkin wrote: >> On Wed, 15 Feb 2023 18:30:57 +0100, Klaus Vestergaard Kragelund >> <klauskvik@hotmail.com> wrote: >> >>> On 15-02-2023 17:45, John Larkin wrote: >>>> https://www.dropbox.com/s/0h88ikjnbxcisl3/CUI_PXO_DC-DC.jpg?raw=1 >>>> >>>> https://www.mouser.com/ProductDetail/CUI-Inc/PXO7805-500-S?qs=Y0Uzf4wQF3l34%252B7eogTBxw%3D%3D >>>> >>>> This is the 5 volt out version but there are others. It can also >>>> convert plus to minus. >>>> >>>> I can't buy the parts for three times that price. >>>> >>> Nice switcher, yes. >>> >>> Can you see the part number of the switcher IC? (would be interesting)' >> >> It's marked 1301 G7 >> > >Nice, thanks :-)The chip on my 10 V upconverter says B6280y that leads to this: http://www.jogjarobotika.com/voltage-regulator/4804-mt3608-3608-b6280-b628-sot23-6-12mhz-2a-step-up-converter.html Must be a similar or the same chip.
