Question for Electronic Masters. LT1581

Barbarin · Aug 30, 2004

Just a second before making definetively the production boards,direct drive 3 and 7 LSIII.. What do you think about the mentioned linear regulator. Batt packs are 3,6V NiMH.
At 10 Amp dropout is almost 0,5V, but at 3 Amps is below 0,2V. Quite good and interesting, specially if using J binned Luxeons. Two of them will work nice on the 7x Luxeon board.

http://www.linear.com/pdf/158125fa.pdf

Ideas, suggestion?

Doug S · Aug 30, 2004

[ QUOTE ]
barbarin said:
Ideas, suggestion?

[/ QUOTE ]
Why yes. Read the third sentance of the "Description" section of the datasheet carefully. /ubbthreads/images/graemlins/smile.gif

evan9162 · Aug 30, 2004

Looks like it needs that extra 1V to run the main pass transistor (looking at the block diagram on page 5).

MrAl · Aug 31, 2004

Hello there,

Yes, i have to agree...it wont work connected directly.

To run off of 3.6 volts an idea would be to build up
a simply switched capacitor boost circuit -- an ic
and a few caps -- to supply the extra 1v or so to
the 'Control' input. This supply only has to put out about
10ma or so if you intend to run the main output up to say
1 amp.

Hey if you build this up now you gotta tell us how
well it worked

Take care,
Al

Question for Electronic Masters. LT1581

Barbarin

Flashlight Enthusiast

Doug S

Flashlight Enthusiast

evan9162

Flashlight Enthusiast

MrAl

Flashlight Enthusiast

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