decade power supply...

J

John Larkin

Guest
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
 
On Thursday, October 13, 2022 at 10:31:12 PM UTC-4, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
Click to expand...

Make your switchers handle 12-24 V range. That would not be unheard of.
 
On a sunny day (Thu, 13 Oct 2022 19:31:00 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<qahhkhtfgeaalbpk96c566bmrspbqst68o@4ax.com>:

In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
Click to expand...

Replace the 5 V switcher wih the clean switching LM we discussed,
add a series diode in the input against reverse voltage.
Leave the rest as is?
 
Replace the 5 V switcher wih the clean switching LM we discussed,
add a series diode in the input against reverse voltage.
Leave the rest as is?
Click to expand...

PS
the series diode is really needed, there exist \'universal\' wall-warts,
I have 2:
http://panteltje.com/pub/universal_wart_IXIMG_0879.JPG

Note the 2 pin connector in the middle of the picture
although the + side is marked, you can push the adaptors in both ways!

Bought if from Reichelt.
Always check with voltmeter before use!!!
Nice thing really.
 
fredag den 14. oktober 2022 kl. 06.08.29 UTC+2 skrev Fred Bloggs:
On Thursday, October 13, 2022 at 10:31:12 PM UTC-4, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
Make your switchers handle 12-24 V range. That would not be unheard of.
Click to expand...

or more

https://www.ti.com/tool/TPS54560EVM-515
 
On Friday, October 14, 2022 at 2:31:12 AM UTC, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
Click to expand...

very nice work, thanks John.
I assume your company includes a \"correct\"
AC power adapter with each product.
And you are just being cautious, if say
someone grabs a similar looking adapter in a rush.
You could control the problem by
using special DC connector, but maybe raising the cost?

Of course in consumer space, its the
5 VDC wall warts that are everywhere.
Followed in lesser number by laptop adapters
around 19 - 21VDC

What would happen if a 5-VDC was inputted?
 
fredag den 14. oktober 2022 kl. 15.22.22 UTC+2 skrev Rich S:
On Friday, October 14, 2022 at 2:31:12 AM UTC, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
very nice work, thanks John.
I assume your company includes a \"correct\"
AC power adapter with each product.
And you are just being cautious, if say
someone grabs a similar looking adapter in a rush.
You could control the problem by
using special DC connector, but maybe raising the cost?

Of course in consumer space, its the
5 VDC wall warts that are everywhere.
Followed in lesser number by laptop adapters
around 19 - 21VDC
Click to expand...

soon USB PD switchable between 5-9-12-20V is probably going to the be more common

What would happen if a 5-VDC was inputted?
Click to expand...

nothing, the max809 only enables the switcher above ~8.8V
 
On Thu, 13 Oct 2022 21:08:24 -0700 (PDT), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

On Thursday, October 13, 2022 at 10:31:12 PM UTC-4, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.

Make your switchers handle 12-24 V range. That would not be unheard of.
Click to expand...

24-to-1 in one step is kind of radical. But a dominant factor in this
design is parts availability. We scored a reel of the TPS562208 part
(for 19 cents each!) but they have a max input voltage of 17. A few of
the TPS series can handle 28, but are hard to get and much more
expensive. We have 1100 on order, about a years supply. I sure hope
they can actually ship.

I need a lot of +5 so may as well use that as the intermediate. It
makes reliable sequencing easier too.
 
On Fri, 14 Oct 2022 05:10:38 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Thu, 13 Oct 2022 19:31:00 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
qahhkhtfgeaalbpk96c566bmrspbqst68o@4ax.com>:


In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.

Replace the 5 V switcher wih the clean switching LM we discussed,
add a series diode in the input against reverse voltage.
Leave the rest as is?
Click to expand...

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

This supply forced me to use four new parts, all from TI, which is a
good thing in the long run.

I like TI. They make good stuff and are not exploiting the parts
storage. We can get parts direct from TI at sensible prices, which I
suspect keeps the distributors and brokers in line.
 
On Fri, 14 Oct 2022 06:22:17 -0700 (PDT), Rich S
<richsulinengineer@gmail.com> wrote:

On Friday, October 14, 2022 at 2:31:12 AM UTC, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.

very nice work, thanks John.
I assume your company includes a \"correct\"
AC power adapter with each product.
Click to expand...

We do, but about half of our customers have their own DC power and buy
without the wart.

But on my bench, I sometimes have several warts with their leads
tangled and it\'s easy to grab the wrong one. I paint the connectors to
color code the voltages, but it seems that is not commom practice. We
sell maybe 700 a year of this box and maybe 5 come back with the 12v
transzorb fried.



And you are just being cautious, if say
someone grabs a similar looking adapter in a rush.
You could control the problem by
using special DC connector, but maybe raising the cost?

Of course in consumer space, its the
5 VDC wall warts that are everywhere.
Followed in lesser number by laptop adapters
around 19 - 21VDC

What would happen if a 5-VDC was inputted?
Click to expand...

This design won\'t start up until about 8.8 volts, so 5v wouldn\'t harm
it. I do want a quiet and stable +5 supply, so would prefer to make
that internally. Our biggest user buys it board-only and puts it
inside a camera, and supplies +12.

I guess we could use a buck-boost Sepic to let it run from most
anything. But I\'m too tired of this to start over, and we\'ve bought a
lot of parts because we could.

I might change the inductors, after we do some breadboarding.
 
On Fri, 14 Oct 2022 06:52:54 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

fredag den 14. oktober 2022 kl. 15.22.22 UTC+2 skrev Rich S:
On Friday, October 14, 2022 at 2:31:12 AM UTC, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
very nice work, thanks John.
I assume your company includes a \"correct\"
AC power adapter with each product.
And you are just being cautious, if say
someone grabs a similar looking adapter in a rush.
You could control the problem by
using special DC connector, but maybe raising the cost?

Of course in consumer space, its the
5 VDC wall warts that are everywhere.
Followed in lesser number by laptop adapters
around 19 - 21VDC

soon USB PD switchable between 5-9-12-20V is probably going to the be more common


What would happen if a 5-VDC was inputted?

nothing, the max809 only enables the switcher above ~8.8V
Click to expand...

The left side of sheet 1 is responsible for supplying +5 with
guaranteed brownout behavior to the downstream stuff. Specifically, a
short dip in the +5 is impossible; that lets the critical low voltage
supplies discharge and makes the powerup sequencing reliable.

That MAX809 guarantees a minimum low time of 140 ms. The MAX809 is a
great part, especially if you don\'t buy Maxim.
 
On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<jsuikhl0qs3svdt2lrd1fsm6k4gaq76thp@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.
Click to expand...

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
 
On Fri, 14 Oct 2022 16:16:03 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
jsuikhl0qs3svdt2lrd1fsm6k4gaq76thp@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
Click to expand...

It can be done with a single Pfet.
 
fredag den 14. oktober 2022 kl. 18.46.55 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 16:16:03 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
jsuikhl0qs3svdt2l...@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
It can be done with a single Pfet.
Click to expand...

as long as you don\'t need it to stop back feeding the source
 
On 2022-10-14 15:52, Lasse Langwadt Christensen wrote:
fredag den 14. oktober 2022 kl. 15.22.22 UTC+2 skrev Rich S:
On Friday, October 14, 2022 at 2:31:12 AM UTC, John Larkin wrote:
In this case, \"decade\" means ten outputs.

https://www.dropbox.com/s/3vt6uv92j07t9el/Pwr_Oct13_1.jpg?raw=1

https://www.dropbox.com/s/bhee8qchkegqa60/Pwr_Oct13_2.jpg?raw=1

We have a nice little box that\'s getting old and needs a redesign, and
I\'m doing the power supplies. The present unit uses a 12-volt wart,
but people occasionally plug in 24 and blow it up, so we want the new
one to run from 12 or 24.

What happens is that a 12 volt TVS shorts and sacrifices its life to
protect the downstream stuff. Same idea at 24, but higher voltage
warts are relatively rare.

The entire PCB is 3.5 x 4.7 inches and I\'m supposed to fit 10 power
supplies into about the area of two Ritz crackers.

We\'re breadboarding the switchers to make sure everything is OK.
very nice work, thanks John.
I assume your company includes a \"correct\"
AC power adapter with each product.
And you are just being cautious, if say
someone grabs a similar looking adapter in a rush.
You could control the problem by
using special DC connector, but maybe raising the cost?

Of course in consumer space, its the
5 VDC wall warts that are everywhere.
Followed in lesser number by laptop adapters
around 19 - 21VDC

soon USB PD switchable between 5-9-12-20V is probably going to the be more common
Click to expand...

Just what we need: Still more options and configurations. NOT!

Jeroen Belleman
 
On Friday, October 14, 2022 at 5:56:17 PM UTC, lang...@fonz.dk wrote:
fredag den 14. oktober 2022 kl. 18.46.55 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 16:16:03 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
jsuikhl0qs3svdt2l...@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
It can be done with a single Pfet.
as long as you don\'t need it to stop back feeding the source
Click to expand...

Agreed, Lasse - the topic of \"ideal diode\" is worthy of its own thread.
Many circuits Ive seen failed to meet all the requirements.
 
On Fri, 14 Oct 2022 11:37:00 -0700 (PDT), Rich S
<richsulinengineer@gmail.com> wrote:

On Friday, October 14, 2022 at 5:56:17 PM UTC, lang...@fonz.dk wrote:
fredag den 14. oktober 2022 kl. 18.46.55 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 16:16:03 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
jsuikhl0qs3svdt2l...@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
It can be done with a single Pfet.
as long as you don\'t need it to stop back feeding the source

Agreed, Lasse - the topic of \"ideal diode\" is worthy of its own thread.
Many circuits Ive seen failed to meet all the requirements.
Click to expand...

We used some TI Efuse parts. Mostly blew up.
 
On Fri, 14 Oct 2022 05:58:44 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

Replace the 5 V switcher wih the clean switching LM we discussed,
add a series diode in the input against reverse voltage.
Leave the rest as is?

PS
the series diode is really needed, there exist \'universal\' wall-warts,
I have 2:
http://panteltje.com/pub/universal_wart_IXIMG_0879.JPG

Note the 2 pin connector in the middle of the picture
although the + side is marked, you can push the adaptors in both ways!

Bought if from Reichelt.
Always check with voltmeter before use!!!
Nice thing really.
Click to expand...

The polyfuse and TVS can handle reverse supply voltage. The TVS is
just a big diode in its forward direction.
 
lørdag den 15. oktober 2022 kl. 00.29.32 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 11:37:00 -0700 (PDT), Rich S
richsuli...@gmail.com> wrote:

On Friday, October 14, 2022 at 5:56:17 PM UTC, lang...@fonz.dk wrote:
fredag den 14. oktober 2022 kl. 18.46.55 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 16:16:03 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
jsuikhl0qs3svdt2l...@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
It can be done with a single Pfet.
as long as you don\'t need it to stop back feeding the source

Agreed, Lasse - the topic of \"ideal diode\" is worthy of its own thread.
Many circuits Ive seen failed to meet all the requirements.

We used some TI Efuse parts. Mostly blew up.
Click to expand...

what did you do to them?
 
On Fri, 14 Oct 2022 16:22:09 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

lørdag den 15. oktober 2022 kl. 00.29.32 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 11:37:00 -0700 (PDT), Rich S
richsuli...@gmail.com> wrote:

On Friday, October 14, 2022 at 5:56:17 PM UTC, lang...@fonz.dk wrote:
fredag den 14. oktober 2022 kl. 18.46.55 UTC+2 skrev John Larkin:
On Fri, 14 Oct 2022 16:16:03 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 14 Oct 2022 08:16:38 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
jsuikhl0qs3svdt2l...@4ax.com>:

We\'ve considered a zillion options on this supply. Efficiency (ie box
cooling) and parts size are just a couple of dominant issues. The old
50 KHz Simple Switcher is quiet, but inefficient and uses giant parts.
The series diode and the catch diode would both get hot.

Did not somebody show the \'perfect diode\' with a MOSFET and 2 transistors here recently?
It can be done with a single Pfet.
as long as you don\'t need it to stop back feeding the source

Agreed, Lasse - the topic of \"ideal diode\" is worthy of its own thread.
Many circuits Ive seen failed to meet all the requirements.

We used some TI Efuse parts. Mostly blew up.

what did you do to them?
Click to expand...

Used them at the input of a pockels cell driver that ran from a 48
volt supply. TPS26600, rated for 60 volts.

With a power-pad TSSOP package, it takes about 200x as much time to
replace as a real fuse.
 
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