dc-dc converter output current limit programming

F

franticET

New Member

• Sep 23, 2014

• #1

Hi,
i'm looking for a buck converter or other kind of regulated dc/dc converter able of mantaining a constant output voltage of 48V, with a 40V to 60V input Vcc, and an output current programming pin able to source up to 1A.

Is there any IC (Linear Tech or Texas) that satisfies these requirements?

Is it possible to realize it?

Any ideas or help will be useful!!!

Thanks a lot

 

ChrisP58

Well-Known Member

Most Helpful Member

• Sep 24, 2014

• #2

Since your input voltage range extends both above and below your output, you need a converter that will both buck and boost.

The Texas instruments LM5118 will do that.

 

throbscottle

Well-Known Member

• Sep 24, 2014

• #3

Look up cuck converters - I think that will do what you want.

 

crutschow

Well-Known Member

Most Helpful Member

• Sep 24, 2014

• #4

Here's a search result for the buck/boost type of converter you need.

 

alec_t

Well-Known Member

Most Helpful Member

• Sep 25, 2014

• #5

an output current programming pin

Click to expand...

If the output voltage is fixed at 48V the output current will be determined by the connected load resistance, not 'programmed'. Do you mean a programmed current limit?

 

F

franticET

New Member

• Sep 25, 2014

• #6

i've thought a converter like lt1510 http://cds.linear.com/docs/en/datasheet/1510fc.pdf with a current output programming pin, but the output is 20V max.
In this kind of converter is the voltage constant by varying the current?

 

alec_t

Well-Known Member

Most Helpful Member

• Sep 25, 2014

• #7

In this kind of converter is the voltage constant by varying the current?

Click to expand...

For a load such as a battery being charged, the current will vary if the voltage is kept constant, or the voltage will vary if the current is kept constant.