Reply by Jan Panteltje ●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.
Reply by Jan Panteltje ●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 John Larkin ●February 15, 20232023-02-15
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.
Reply by Klaus Vestergaard Kragelund ●February 15, 20232023-02-15
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 :-)


>>
>> 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.
> 
> 
> 

Yes, a big diode on the PCB, so probably a schotkky
Reply by Klaus Vestergaard Kragelund ●February 15, 20232023-02-15
On 15-02-2023 23:00, Lasse Langwadt Christensen 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?


It's not just that. I was working on a project where we had a 6 million 
quantity, so we had direct and almost open calculations on pricing. We 
managed to quote the same part from Europe and Asia, which provided 
different cost. The answer we got was that the support structure is 
costly in EU/Western countries. In Asia much less cost which moved the 
price down significantly. Also, Asia is a tougher marked, so markup is 
lower there.
Reply by Lasse Langwadt Christensen ●February 15, 20232023-02-15
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?
Reply by John Larkin ●February 15, 20232023-02-15
On Wed, 15 Feb 2023 13:25:20 -0800 (PST), Lasse Langwadt Christensen
<langwadt@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?
Reply by Lasse Langwadt Christensen ●February 15, 20232023-02-15
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
Reply by John Larkin ●February 15, 20232023-02-15
On Wed, 15 Feb 2023 12:26:04 -0800 (PST), Lasse Langwadt Christensen
<langwadt@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.
Reply by Lasse Langwadt Christensen ●February 15, 20232023-02-15
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?