Changing SPS output voltage?

[DaveC]

How difficult is it to convert a 12-volt switcher to output a lower voltage
(ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

Thanks,
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DaveC
me@privacy.net
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[Jerry G.]

I would rather add on an external voltage regulator circuit for 5 Volts. If
you modify the supply, there may be other issues with current control, and
protection. The higher voltage differential may also cause some heat
problems under load.


--

Greetings,

Jerry Greenberg GLG Technologies GLG
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"DaveC" <me@privacy.net> wrote in message
news:0001HW.BCA947230019CA8CF058A5B0@news.individual.net...
How difficult is it to convert a 12-volt switcher to output a lower voltage
(ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

 

[CWatters]

"DaveC" <me@privacy.net> wrote in message
news:0001HW.BCA947230019CA8CF058A5B0@news.individual.net...

How difficult is it to convert a 12-volt switcher to output a lower
voltage
(ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

It depends very much on the details of the design. Can't answer it without a
circuit diagram at the very least.

Colin

 

[Ian Stirling]

In sci.electronics.design DaveC <me@privacy.net> wrote:

How difficult is it to convert a 12-volt switcher to output a lower voltage
(ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

If you are very lucky, yes.
Generally at best, you'll get the same ripple, and current capability, and
regulation.
At worst, it may not work effectively at that voltage without extensive
modification.

 

[Mjolinor]

"DaveC" <me@privacy.net> wrote in message
news:0001HW.BCA947230019CA8CF058A5B0@news.individual.net...

How difficult is it to convert a 12-volt switcher to output a lower
voltage
(ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

I have done this succesfully on lots of them. There is quite often a

potential divider on the output with just two resistors and I have changed
the ratios to get the feedback the same from the voltage I wanted.

No guarantees