Hi! welcome to product test and review by Robojax. In this video we are going
to see and test this 15 ampere voltage regulator SZDK07 with
constant current and constant voltage let's get started with this.
My name is Ahmad Shamshiri and I am presenting this review from Canada.
In this video we are going to first explain the hardware with all the inputs output and
how to control voltage and current after that I'm going to start testing this
first I will test the output regulation to see if it can give you any desired
voltage that you want at the output with the input voltage of 30, 24, 15, 12, 9 and
5 volts we are going to get those standard voltages of 24 15 12 9 5 and
3.3 volts then we will look at the repel voltage at the output as well
Hardware Explained
This module has an input voltage of 6-40 volts and the output voltage you can get is
1.2 to 36 volts and that total current that this can handle is 15 ampere with
the current heat sink and we're going to test it and see how it can handle all
this current. Because the device has constant current it means that if you
set the current let's say fast 5 amperes by rotating this when the load is
connected when the root current reaches the limit setting for example of 5
ampere that you said it reduces the output voltage. Here is this module now
have an input on this left side if you see the switch in
here so we have an ON and OFF switch that turns this ON and OFF
there is a power LED here and then we have these two terminals the negative is
there the positive here. Using Philips screwdriver it seems they are not that
high quality but but one point it has been soldered on this side and these are
the output terminals that you will connect your wires under these screws
and then tighten it and we have two Potentiometer here the first one is here
labeled a CV constant voltage so with this one you regulate the output voltage
the second one is CC this is constant current with this one you can set your
current limit. there is no meter for that so you have to experiment and connect a
load and then measure the current and then turn this and to see then the two
regulators is one regulated on this side with a heatsink and then the other one
is connected on this side the main chip that is doing the regulation is at the
bottom with all these components so when you are using this make sure that you
have enough protection at the bottom otherwise anything will touch and one
of these components resistor capacitor or maybe you and the chip will pop out
so it needs protection but the heatsink have been connected
using these two screws here so this seems to be very solid .this winding is
also tightened enough these two cables or these two wires are from this winding
Width of this modulus 53 millimeters the Length 60 millimeters Dept of this
module including those pins that are out is twenty-eight-point-three
millimeter it weighs 85.1 grams. I just removed this MOSFET from here it's
IRFB3607 this is a 75V volts 80A MOSFET and this one is also
IRFB3607 . and I was not able to read the model of this chip that says
the datasheet for the MOSFET that is used in this module this is a N-channel
mosfet as you can see the drain current is 80A and drain-source voltage is
75 volts the drain-source resistance is 7.34 milli ohm and the maximum is nine
milli ohms I will provide the link for this incase if you want to read it
further.
Demonstration
Maximum and minimum voltage
now I'm testing the voltage regulation of this so we're applying whatever
voltage that we have the input for example terrible that I enter I should
be able to get anything below 30 up to 5 volts. Let's see what we get at the 30 volts
the maximum voltage that we can get that's the maximum . and let's go
with a minimum so we can get up to
1.51 V. let me connect the current know
we cannot get 1.5V when load it connected.
so we can get onto 2.5 volts output with 30 V input. the minimum voltage that we get.
Test with Input: 30V
I'm going to start testing this module under different input and output load
condition first I'm going to start with the highest voltage that this can accept
around 36 volt so I'm entering it as 30 volts and then we go with their standard
voltages such as 24 volts 15 volts 12 v, 5V and 3.3 volts so all those voltages that are
standard. I'm going to test it and then we'll see what amount of current that
this can handle in those voltages. so starting with 30 I'm gonna set the
output voltage at 24 volts this is a potentiometer for the voltage the
suggested current is 15 ampere and we are going to test it with 15 and here
I'm setting the current here once the load is connected you will see it here
this is now just a voltmeter connected to that to this once I turn this on you
will see the 15 ampere so let me turn it on at 24 volts now 15 ampere is being
drawn from this as you can see my power supply is now fan is on and you can hear
it so the voltage almost 1 volt drop tells
the voltage is 900 millivolts drop this is not acceptable so I have to reduce it
until I get at 9 ampere and input is 7.2 ampere.
Output is 15 volts input if 30 let's go with 10 ampere
see now this is hot
but not that hot, bearable.
path
now output twelve volts 12 ampere so a 12 amp
30 volts output fools let's go other 12.2 impaired of
the input now
now 30 volts and output 5 volts let's go to 13 amp very hot so 12 amp input 2.1
ampere
now 30 input 3.3 output 1.3 as input
you
now we are starting another and put a voltage test 24 volts we are going to
test it at 15 volts output 12 volts 95.5 volts and 3.3 now we are starting
another input voltage test 24 volts we are going to test say that 15 volts
output 12 volts 9V, 5.5 volts and 3.3 now it says 15 volts 11 amp 11 extremely hot
still at 15 volts and put a 6.4A.
to a 24 input 12 output 10 ampere section 400 millivolts drop here let me
increase it 9 ampere so 9 ampere input is 4.6A
24 volts input 9 V out 9 ampere that's 400 millivolts drop still okay make a 10
amp so now it's 10 ampere it's more than 500 millivolts so I'm gonna reduce it
back so 9 ampere let's see
five output I'm per 500 millivolts drop 9 ampere is
acceptable but if I increase it it will either heat up or the voltage will drop.
now this is stop dropping more than 500 millivolts it's at the edge okay at the
input we have 1.9 ampere.
now and put 24 output 3.3 volts 9 amp l let's check it
8A the voltage increased now 300 millivolts
7A amp for 3.3 volts we cannot tolerate 0.5 volts drop. Let's go to 8A the
voltage increased now 300 millivolts 7 amp
Test with input: 15V
now I have connected input 15 volts and the output we are going to test 12 volts 9 5
and 3.3 volts output is now 12 volts that's connected with seven amp so 400
millivolts job that's fine let's increase it 400 millivolts that's 8
ampere 9 amp 500 millivolts if I go up it's below 500 millivolts I'm
going back but we have 9 ampere that's more than 500 millivolts it now it is
good because we were close to 400mV drop so a 9 ampere and put a
7.3
Input 14V, 9V output 9 ampere on 500 millivolts drop acceptable input is
5.5A
Input 15V, 5V output. 9 ampere and input 3.1A
15V input, 3.3V output
that's around 500 millivolts not acceptable only 300 millivolts will be
tolerated here
5 A will give you 3 volts which is 300 millivolts below the limit and
input current is 1.1A.
Test with input: 12V
now I'm trying a 12 volts input the output we are going to test this 9 5 and
3.3 volts its 9A ampere at the output and volts at the output and this is 500
increase it so I'm watching until it becomes 8.5
still good now it's more than 500 reducing
so output 9A, input 6.9A
Input 12V, output is 5V with nine amp 500 millivolts drop
just at the edge this is acceptable input is 3.9A.
12 volts input 3.3 output 9 ampere
it's more than 300 millivolts drop so 8 ampere 7, 6A will give us 300
drop acceptable. input is 1.7 amp.
Test with input: 9V
now we are going to test it at nine volts input 5V and 3.3V output
now let's go with 5A that's 6A I'm slowly increasing it so the voltage drop is
above 500 millivolts drop not acceptable so 7A is good input is 4.1A
nine volts input 3.3V output with 7A.
this is now acceptable 5A , input is 1.9A
Ripple Voltage
now I'm going to have a look at a ripples
the input is now 30 volts and the output is 12 volts 10 ampere this is 9 ampere
at nine am - this is a ripple that you are seeing this is a easy portion of the
signal and we are getting 212 millivolts a ripple between this point and that
point now I'm looking at 15 volts
10 amperes
so
264 millivolts at 15 volts output now we are at 24 volts we are getting almost
250 millivolts ripple. 10 ampere at about 12 volts we are getting again around 250
260 millivolts ripple . 9 volts we are getting almost the same at 5 volts we
are getting almost the same as you can see the switching frequency is
reflecting here before the frequency was higher now it's a lower because we are
seeing less of those spikes if you do not look at their spikes just from here
to here it will be around 184mV. so let's go to 3.3 volts I changed it around this is now
run 216 millivolts ripple and now without the current now this is
around 86 millivolts. thanks for watching this was if you liked the video please
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