[NLRS] The woes of 13.8 vdc

[Chris Cox]

On Sat, 12 Jul 2003 W0ZQ@aol.com wrote:
> 3.   Go with a DC/DC converter of some type.   Some unregulated DC voltage 
> in, a regulated 13.8vdc out.   Sounds kind of expensive and messy to me, 
> especially when running portable.   Anyone have any experience with doing this ?   Is 
> there anything commercial available.   

There is a very nice single, five-legged IC available that may do the job, 
although I think it's rated at up to 5A not 6 or 7.  It is an LM2577T and 
comes in a TO220-5 package.  It needs only a small handful of external 
components to do its job, an inductor, couple of resistors and capacitors.

Perhaps there is a variant of it available that will source more current.

Oh, it will step up or down as necessary to maintain regulation.  It does 
generate a little hash at 52kHz, but it shouldn't be too tough to filter 
out if it is a problem.

 -- 
73  Chris Cox  N0UK, G4JEC, ex-AB0CN, ex-G8PTC  RNARS #1157  EN34jv

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