adj vs fixed regulators

A

Adam. Seychell

Guest
What is it with semiconductor manufactures producing lines of voltage
regulators having different predetermined voltages while also providing
an adjustable version. For the cost of two SMD resistors, how does that
justify the extra logistics and distribution involved supplying several
different versions of essentially the same IC ?

Adam
 
"Adam. Seychell" wrote:

What is it with semiconductor manufactures producing lines of voltage
regulators having different predetermined voltages while also providing
an adjustable version. For the cost of two SMD resistors, how does that
justify the extra logistics and distribution involved supplying several
different versions of essentially the same IC ?
Click to expand...
I guess because....

1. The fixed regs will have better tolerance limits than one could achieve with
standard (1%) resistors.

2.As they are (usually) the same price, 2 extra resistors could mean a circuit
no longer meets cost restrictions. Remember in some mass production units just
0.1 cent can make a difference.

3. The variable ones have many other uses other than just as a voltage reg.

But maybe I'm talking shyte.

Gibbo
 
On Sun, 24 Oct 2004 07:59:45 +1000, Adam. Seychell wrote:

What is it with semiconductor manufactures producing lines of voltage
regulators having different predetermined voltages while also providing
an adjustable version. For the cost of two SMD resistors, how does that
justify the extra logistics and distribution involved supplying several
different versions of essentially the same IC ?

Adam
Click to expand...
I don't mean to be glib, but I think it is just a supply and demand thing.
As long as people keep buying them, the manufacturers will keep making
them. Does something about that not make sense?

--Mac
 
"Mac" <foo@bar.net> wrote in message
news:pan.2004.10.23.22.46.17.190632@bar.net...
On Sun, 24 Oct 2004 07:59:45 +1000, Adam. Seychell wrote:

What is it with semiconductor manufactures producing lines of voltage
regulators having different predetermined voltages while also providing
an adjustable version. For the cost of two SMD resistors, how does that
justify the extra logistics and distribution involved supplying several
different versions of essentially the same IC ?

Adam

I don't mean to be glib, but I think it is just a supply and demand thing.
As long as people keep buying them, the manufacturers will keep making
them. Does something about that not make sense?

--Mac
Click to expand...
I have designed in a variable regulator, to provide 2 isolated and 6 other
voltages with a single part number. There is a very good reason for the parts.
 
Mac foo@bar.net wrote:

On Sat, 23 Oct 2004 23:56:39 +0000, Clarence wrote:


"Mac" <foo@bar.net> wrote in message
news:pan.2004.10.23.22.46.17.190632@bar.net...
On Sun, 24 Oct 2004 07:59:45 +1000, Adam. Seychell wrote:

What is it with semiconductor manufactures producing lines of voltage
regulators having different predetermined voltages while also
providing an adjustable version. For the cost of two SMD resistors,
how does that justify the extra logistics and distribution involved
supplying several different versions of essentially the same IC ?

Adam

I don't mean to be glib, but I think it is just a supply and demand
thing. As long as people keep buying them, the manufacturers will keep
making them. Does something about that not make sense?

--Mac


I have designed in a variable regulator, to provide 2 isolated and 6
other voltages with a single part number. There is a very good reason
for the parts.

Are you trying to support my argument or refute it?

It seems to me that your example, to the extent that one single example is
meaningful, makes a good case for the manufacturers ditching the fixed
voltage parts.

But your last sentence seems to suggest that there is a significant market
for both types of parts, which is what I am arguing.
Click to expand...
But this part from Clarence I really would like to see....

Can we have a schematic please?

I have designed in a variable regulator, to provide 2 isolated and 6
other voltages with a single part number.
Click to expand...
Gibbo
 
"ChrisGibboGibson" <chrisgibbogibson@aol.com> wrote in message
news:20041023235934.22732.00002554@mb-m15.aol.com...
Mac foo@bar.net wrote:

On Sat, 23 Oct 2004 23:56:39 +0000, Clarence wrote:


"Mac" <foo@bar.net> wrote in message
news:pan.2004.10.23.22.46.17.190632@bar.net...
On Sun, 24 Oct 2004 07:59:45 +1000, Adam. Seychell wrote:

What is it with semiconductor manufactures producing lines of voltage
regulators having different predetermined voltages while also
providing an adjustable version. For the cost of two SMD resistors,
how does that justify the extra logistics and distribution involved
supplying several different versions of essentially the same IC ?

Adam

I don't mean to be glib, but I think it is just a supply and demand
thing. As long as people keep buying them, the manufacturers will keep
making them. Does something about that not make sense?

--Mac


I have designed in a variable regulator, to provide 2 isolated and 6
other voltages with a single part number. There is a very good reason
for the parts.

Are you trying to support my argument or refute it?

It seems to me that your example, to the extent that one single example is
meaningful, makes a good case for the manufacturers ditching the fixed
voltage parts.

But your last sentence seems to suggest that there is a significant market
for both types of parts, which is what I am arguing.


But this part from Clarence I really would like to see....

Can we have a schematic please?

I have designed in a variable regulator, to provide 2 isolated and 6
other voltages with a single part number.

Gibbo
Click to expand...
Belongs to the customer, Rockwell International.
 
"Mac" <foo@bar.net> wrote in message
news:pan.2004.10.24.03.48.05.114714@bar.net...
On Sat, 23 Oct 2004 23:56:39 +0000, Clarence wrote:
snip


I have designed in a variable regulator, to provide 2 isolated and 6
other voltages with a single part number. There is a very good reason
for the parts.

Are you trying to support my argument or refute it?

It seems to me that your example, to the extent that one single example is
meaningful, makes a good case for the manufacturers ditching the fixed
voltage parts.

But your last sentence seems to suggest that there is a significant market
for both types of parts, which is what I am arguing.
--Mac
Click to expand...
What argument? If there is a market for both, then there should be production
of both.
My one example, (Out of dozens of possible) was intended to show there is a
useful side to providing a variety.

My view, NOT argument!
 
"Mac" <foo@bar.net> wrote in message
news:pan.2004.10.23.22.46.17.190632@bar.net...
On Sun, 24 Oct 2004 07:59:45 +1000, Adam. Seychell wrote:

What is it with semiconductor manufactures producing lines of
voltage regulators having different predetermined voltages
while also providing an adjustable version. For the cost of two
SMD resistors, how does that justify the extra logistics and
distribution involved supplying several different versions of
essentially the same IC ?
Click to expand...
Fixed regulators don't need any other parts to work, a good thing when you
are making a few million thingamajigs.


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