nice little switcher...

J

John Larkin

Guest
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.
 
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.
Click to expand...

Can you see the part number of the switcher IC? (would be interesting)\'

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
 
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)\'
Click to expand...

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
Click to expand...

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.
 
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.
Click to expand...

https://www.mornsun-power.com/public/uploads/pdf/SCM1301A.pdf maybe?
 
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?
Click to expand...

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.
 
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.
Click to expand...

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
 
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
Click to expand...

How can they sell them for 18 cents, when we are paying 61?
 
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?
Click to expand...

you are buying them the wrong place?
 
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?
Click to expand...

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.
 
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
Click to expand...

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.
Click to expand...
Yes, a big diode on the PCB, so probably a schotkky
 
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?
Click to expand...

Direct from TI.
 
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.
Click to expand...

Yes, ebay stuff from China, I have some of these:
https://www.ebay.com/itm/112855472220
 
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 :)
Click to expand...

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.
 
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