LT3080 EST micro circuit - diyAudio
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Old 26th April 2015, 07:22 PM   #1
scafas is offline scafas  Italy
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Location: italia
Default LT3080 EST micro circuit

my intention ' to replace the various integrated circuits of the series 78XX , with micro circuits to three feet ( in - gnd -out ) containing l ' lt3080est ( SMD version ) , a trimmer to adjust and two capacitors.
Click the image to open in full size.
this is the micro pcb..
Click the image to open in full size.
what do you think?
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Old 27th April 2015, 05:25 AM   #2
scafas is offline scafas  Italy
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Join Date: Dec 2007
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Quote:
Originally Posted by scafas View Post
my intention ' to replace the various integrated circuits of the series 78XX , with micro circuits to three feet ( in - gnd -out ) containing l ' lt3080est ( SMD version ) , a trimmer to adjust and two capacitors.
Click the image to open in full size.
this is the micro pcb..
Click the image to open in full size.
what do you think?
the price for a full assembled is 6eu.
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Old 27th April 2015, 05:58 AM   #3
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Location: Baulkham Hills
I like the idea. Why don't like the 7805? How real is the 1.1Amps? That's a pretty small package. Surely the thermal coefficient is not very high.

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Old 27th April 2015, 06:15 AM   #4
scafas is offline scafas  Italy
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Quote:
Originally Posted by kool lites View Post
I like the idea. Why don't like the 7805? How real is the 1.1Amps? That's a pretty small package. Surely the thermal coefficient is not very high.

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The LT3080 is a 1.1A low dropout linear regulator that can
be paralleled to increase output current or spread heat in
surface mounted boards. Architected as a precision current
source and voltage follower allows this new regulator
to be used in many applications requiring high current,
adjustability to zero, and no heat sink. Also the device
brings out the collector of the pass transistor to allow low
dropout operation —down to 350 millivolts— when used
with multiple supplies.
A key feature of the LT3080 is the capability to supply a
wide output voltage range. By using a reference current
through a single resistor, the output voltage is programmed
to any level between zero and 36V. The LT3080 is stable
with 2.2µF of capacitance on the output, and the IC uses
small ceramic capacitors that do not require additional
ESR as is common with other regulators.
the circuit measure 1cm x 2cm
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Old 27th April 2015, 10:51 AM   #5
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I can read data sheets too.
36 volts in and output set to say 5 volts and your load is 1/2 amps, your board will disapate 15.5 watts.
What purpose do you have for the little regulator. I see it usefull for dropping 5v down to 3.5v.

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Old 27th April 2015, 11:18 AM   #6
scafas is offline scafas  Italy
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Join Date: Dec 2007
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Quote:
Originally Posted by kool lites View Post
I can read data sheets too.
36 volts in and output set to say 5 volts and your load is 1/2 amps, your board will disapate 15.5 watts.
What purpose do you have for the little regulator. I see it usefull for dropping 5v down to 3.5v.

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this system and ' was designed to obtain the best performance in conditions of low output current otherwise need a heat sink , or another type of stabilization system .

logically if you have to get 5 volts output , 1/2 ampere , you can not put 36 volts input ...... but you have to put 7-9volt
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Old 27th April 2015, 09:30 PM   #7
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You still haven't said what your intention is with these. The are not a universal 78 xx series replacement. The sot-223 case has a high temp coefficient (62 degree C /w) on large pcb (2500mm2). Your little board will have a higher temp coefficient.
You mention being able to parallel outputs but didn't bring the set pin out to bus togeather.
Maybe your use will be ok. I can see a few scenarios where these may be useful, but a universal replacement they are not.

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Old 28th April 2015, 09:31 AM   #8
scafas is offline scafas  Italy
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the upgrade with this micro LT3080 is only necessary in circuits not demanding that draw little current .
a small heatsink can be installed behind the pcb so you can substitute any 78xx ic.
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Old 28th April 2015, 11:33 AM   #9
scafas is offline scafas  Italy
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Join Date: Dec 2007
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Default layout

other productions are similar to this , I have changed the layout of the PCB , and I added a trimmer to adjust the output voltage , so ' can' be used as a regulator in other circuits.
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