Hi, welcome to another video tutorial from Robojax. in this video we are
going to do the test review of this 3 ampere step-down voltage converter based
on LM 25 96 chip by Texas Instruments. so this is a device. the length of the
module is 40 3.2 millimeter
width of it is 21 point two millimeter depth is thirteen point two millimeter
the module weighs 12 grams which is very good it can use it in drones and other
equipment that weight matters. this is the module as you can see we can read
the name here LM2596 that is the chip. we have input here
this is a positive input and this is the ground or negative I've just connected
it to a these clips to make it easy for this video. This runs with a
very minimum components we have a potentiometer that we can change the output voltage we
have a diode here and then we have an inductor two capacitor at the end some
supplementary components here and this is the output voltage can be adjustable
from 1.2 to 37 volts the input is to this device if 30 volts and then the
output is 5 volts so let me adjust this and see how it responds by the way this
is multi-turn potentiometers when you receive this you have to turn it maybe
10 15 turns before you can see the effect because it's multi turn so don't
give up and don't think it's damaged so I'm going down
I wanna see what is the minimum
so the minimum is 1.56V and as you can see the LED the output LED is also
totally off because that needs 2.2V and higher plus some resistor
that they put so let's see with the 30 volts what (max) we can get as you can see the
LED turned on so that is a very bad design this should have been connected
to the input five
by the way this is very accurate so you can have up to second digits correctly
let me see if I can do 9 volts
I set it at nine-volt. so that is possible so I'm turning it right
clockwise will increase the voltage so 10, 12 let me go faster what is the
maximum voltage that we can get 29 point 5 so so let's see let's go for 20 volts
and 24 volts let's go industrial voltage
24 we got twenty three point three zero point seven volt
difference maybe I have to turn this again now that's
you see I'm turning it so many laps before I see the effect now it's so at
this point yeah so let me go for 12 volts (input)
and then (lets check) what we can get
so now I have to do with multiple turns before I see that difference
this voltmeter needs some voltage so 2.7volts but I
don't have forty volts to test it but up to thirty that was fine
so this is a datasheet as you can see this is a switching power supply step
down to the ampere that's the rated value and the voltage can go up to forty
volts input voltage with the output can get thirty seven volts those are the
150kHz frequency that's internal oscillators which we are
not concerned oh this chap is offered it a two pin
configuration this is one type of configuration to-20 220 which has a 7
pin in both cases but this has a little longer heatsink here as you can see but
the one that is used here is TO-263 which are shorter which means this area
that can dissipate heat is eliminated so when this is small there is more risk
but you'll see that so another important characteristic of this one is under
standby current is 80 micro ampere which is very nice when you don't draw a
current it will drop very little a 2 micro ampere is very low considering
with a current rating of volts so this is a typical configuration there are
some maximum supply voltage 45 volts so it can handle up to 45 volts at the
input and the lead temperature the maximum Junction temperature 150 milli
amp degree Celsius and then the vapor phase for 60 second it can handle up to
215 degrees Celsius actual operating temperature from minus 40 to 125 degree I
just think it it will be 73% where we are full details of the design and
calculations this if even you use it as adjustable so here are the formula which
I'm not gonna go through but I would definitely suggest if you are interested
to play work with this chip have a look at this - have a look at
this data sheet. the link for the datasheet will be provided.
sheet will be provided the details of this video
Testing the module
and now let's test it with 12 volts input and nine volts output let me go
for 3A so now we have three amp
very hot immediately so that is 27 watts okay so so conclusion so 12 volts input
nine volts output 3 amp not good died let me turn it on what 12 volts
input 9 output this is output 9 volts and tend to ampere
so the device is the module is hot but not that hot. because I can put my
finger here so the module is hot but this is not as hot as you used to be
with 3A. so counter clockwise will decrease the voltage just pay attention
here
so that if I'll put 5 volts so let me turn it on I'm just pressing this button
here so the dissipation started 3 amps so this load is now dissipating 3 amps
from this device so it's heating up
you
so four point nine volts so it will shut off now
okay so 3-amp doesn't work 12 volts input 5 output 0.5 amp let's see by the
way it was already hot so we just continue with the test
when the temperature reaches above 45 this fan (sorry) will turn on
now I have to put this because the wind from this will cool the module OFF, we
will give us false result
so the device the device did not shut down but I do not trust this 2.5 because
this is extremely hot and I would advise against it to get 2.5 amps from here at
12 input and 5 output ok I've set this now I'm testing it for 3.3 volts so I've
said this for 3 volts to shut off let's go for 3 amp
all these components are hot all of them because the this board is hot the heat
is transferred because this is directly attached all of these are at the maximum
temperatures at the moment
so it shut off. so 12 volts input 3.3 output with 3 amp no got failed now I'm
putting a 3.3 volts at 2A
so with 2A still it is too hot
I can touch it it's it's hot I cannot hold it for a long time but it's very
cooler with comparing to the previous two point five and three amps so twelve
volt input three output with two amp that's good so based on the test that I
did we came to conclusion that this device cannot handle 3A or 2.5
amp at all at any voltage so this can handle 2
ampere with input and output voltage or very close but if the voltage or output
and input are too far for example from 12 to 3 volts 2 ampere will be too high
because the dissipation of power will be too high and temperature will
increase this will not be able to handle it but generally 2 amperes seems okay so
if you can have a fan or something that cooled this off it will definitely work
2.5 amp but 3 amp absolutely not it needs bigger heatsink here
it needs actual aluminum or other means of good heatsink . so that's it folks
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Subtitle typed and corrected on Mar 24, 2020 when Coronavirus is spreading around the world.
I hope we overcome this pandemic soon and people get to normal life.
I did my part to review this module so you can learn and use it .
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