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Introducing the LVR
Thank you for your interest in our PROTRONIK A2PRO LINEAR VOLTAGE REGULATOR 6A.
This little device is designed to securely power the receiver of your electric or glow model. The LVR 6A is powered itself by a 6 to 9V battery and
gives on its output a stable regulated voltage to suit your servos requirements.
The LVR 6A is also a perfect match for our PROTRONIK Opto ESCs.
The technology used on the LVR 6A makes it noiseless and do not shorten the R/C system range in any way.
The LVR 6A produces a real linear voltage, so servos output power is really linear.
Please read this manual carefully prior to use your LVR 6A PROTRONIK.
SPECIFICATIONS
Dimensions
Weight
Input lead
Output lead
Used technology
Input voltage
Battery compatibility
No charge Amp draw
Output voltage
Output Amp
Voltage stability
Temp protection
Reverse input polarity protection
Output shorts protection
Max power dissipated
REGARDING THE LINEAR VOLTAGE REGULATOR 6A
REMINDER ABOUT INTERNAL BECs
Most af the ESCs on th emarket are equiped with integrated BEC or U‐BEC. This kind of regulator is designed to power the Rx devices (receiver and
servos) from the main battery used to power the model. So you don't need a Rx battery anymore. This solution is seducing but it has its limits :
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Available current is rarely above 2 or 3 A so you can't use this BEC on large or even middle scale models neither than on a model equiped
with 4 servos or more.
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The power that can be dissipated is extremly low. Rarely above 1 W.
These two conditions lead in you in a very hazardous way since :
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Numbers of servos is higher than 4, especially with high torque or digital servos.
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Battery voltage reaches or exceeds 10 V
Your LVR 6A is using a linear voltage regulation principle. This offers a lot of advantages :
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Very stable output voltage servos torque is constant
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No noise generated no reduction of the R/C system range
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Extreme simplicity reliability
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Very low Amp draw better efficiency
WHERE TO USE A LINEAR VOLTAGE REGULATOR
The LVR 6A is to be used when the battery voltage is higher than the voltage required by the servos.
To power a Rx, 3 solutions :
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Classic NiMh battery pack. This is used for many years on glow models and gliders but it's heavy and self discharging.
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A PRO‐TRONIK U‐Bec powered by the main battery. Very lightweight but needs a high quality Rx.
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The LVR 6A. This solution regroups all the adtvantages of the two above without any their drawback.
The LVR 6A is designed to be powered by a 2S LiPo battery which capacity might be choosen according to the Rx consumption. A 2S LiPo battery
has its voltage between 8,4 V (fully charged) and 6 V (fully discharged). This is the optimum LVR 6A range.
Please note that like any linear regulator, the LVR 6A can't deliver an output voltage higher than its input voltage. So when the input reaches a
voltage lower than the selected output, the LVR 6A will only "let through" the current. This may occur if you have selected an output voltage of
5,8V or 6V.
USER MANUAL
LINEAR VOTAGE REGULATOR 6A
75 x 26 x 17 mm
33 g
170mm Silicon wire + UNI/JR connector
2x 170mm Silicon wire + UNI/JR connector
Low Dropout Votage Regulator
6 to 9 V
NiCd, NiMH, LiIon, LiPo and LiFe
0,005 A (6,5 V) / 0,023 A (8 V)
5 V ‐ 5,2 V ‐ 5,4 V ‐ 5,8 V ‐ 6 V +/‐ 2 % (set by jumper position)
6 A (see text below)
Better than 1 % (between 0 and 5 A)
Yes
No
Yes (Auto Protect)
8 W for 30 seconds
The LVR 6A can also be powered by a 6 cells Ni‐MH battery. In this case, the input voltage of the LVR 6A will be between 7,8 V (fully charged) and
4,8 V (fully discharged). This input range exceeds the optimum use of the LVR 6A. So if you use NiMh batteries, we recommand not to set the
V 1.0
output voltage higher than 5.2V
Your LVR 6A is also equiped with a LED Bargraph showing the reminding capacity of your LiPo battery. This « voltmeter » is composed of 4 LEDs (3
green and 1 red)
WARNING : the bargraph is set to show the statut of a LiPo type battery. This info might not be used with NiMh batteries.
HOW TO USE YOUR LINEAR VOLTAGE REGULATOR 6A
As said before, your LVR 6A is a linear voltage regulator.
This means that the output voltage will be set to a fixed value (jumper selected), regardless of the input voltage.
This type of system, very reliable, goes with an obligatory warming depending of the using conditions. This warming is natural. To keep this system
reliable, you have to ensure that the overall temp won't reach the protection temp (see details above).
Here's an example showing you why and how the LVR 6A is warming :
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Battery = LiPo 2S 2200mAh, which voltage is 7,5 V
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LVR 6A set to 5 V
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Rx consumption is estimated to 3A constant (5 standard analog servos)
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Room temp 20 °C
The LVR 6A have to eliminate the excess voltage, that is 2,5 V (7,5V – 5V = 2,5V).
This « elimination » is done into the LVR 6A, as heat. The radiator must dissipate 7,5 W (3A x 2,5V = 7,5 W). This value represents the limit
accepted by the LVR 6A, supposing it is perfectly cooled !
For comparison, note that some SMD soldering irons are only 6W...
This is the reason why the LVR 6A MUST BE cooled. Without the proper cooling, you are taking the chance that the LVR 6A switches to the Auto
Protect mode, which probably means a crash.
This example helps to understand that the power dissipated as heat by your LVR is dependent on the voltage difference between its input and
output on the one hand, and the current flowing on the other. The higher the voltage difference is, more the heat dissipation will be important.
Similarly, more the power is high, more the dissipation will be high.
Finally, more the ambient temperature is high, more the power of dissipation of the radiator is low. You should always take into account these
three parameters to use your LVR 6A in the best conditions of safety.
You can find output voltage curves at the end of this manual according to the position of the jumper, the voltage and current consumption. It is up
to you to determine from these curves the minimum supply voltage of the LVR 6A regarding your application.
Example : If you choose an output voltage of 5.4V (5.4V jumper position), and that permanent consumption of your model is 3 A (blue curve) then
the voltage of your LVR 6A will remain above 6.5 V. Below, the output voltage will be reduced accordingly. Thus, again for the same model, the
output voltage will be 5.1 V if the voltage drops to 6 V, which is still quite acceptable (6V = max discharge voltage of a 2S LiPo battery)
LVR 6A OVERALL SPECIFICATIONS
The output of the LVR 6A is protected against shorts. In case of an excess of consumption or a short circuit, the device will not be destroyed.
Your LVR 6A switches directly to the Auto Protect mode and shuts down its output. When consumption drops back below the rated current, the
output voltage returns to its nominal value.
Your LVR 6A will also switch to the Auto Protect if temp goes above 65°C.
WARNING : We draw your attention to the fact that the onset of one or other of these protections during a flight can cause the model to crash. It
is your responsibility to take all necessary precautions so that this situation does not happen. PROTRONIK will in no way be held liable for the crash
of a model.
Your LVR 6A has a jumper selection of output voltage, allowing you to select the voltage power best suited to the servos in your model. Read
the following characteristics of the data sheet of the manufacturer, and set the jumper on accordingly. If your servos are compatible, you can
supply a voltage higher than 5V and benefit of optimum speed and torque. You can also use an output voltage of 6V if your model uses a dual
power producing a voltage drop as the X‐BIC PROTRONIK accessories (check the instructions for the accessory in question), to have an optimal
voltage supply.
Your LVR 6A is designed to overtake current peaks generated by the servos during a flight. Thus, a very brief inrush current up to 10A will not
be a problem.
Your LVR 6A has a special circuit that adapts the best output voltage versus current consumption. It is therefore normal that the output
voltage measured when the servos are at rest is slightly less than that indicated by the position of the jumper. In flight, when consumption is
normal, your LVR 6A issue the tension you have chosen. Power and speed of the servos are optimized during the entire flight!
Your LVR 6A is provided with high quality silicone power cords made of 0.5mm² twisted wires. This choice allows a very low voltage drop,
despite the high current passing through the wires. Thus, at 3A, the voltage drop is approximately 0.1 V. Under a current of 5 A, the voltage drop
remains below 0.15 V. We advise you not under any circumstances extend these power cords, otherwise significantly increase the voltage drop.
Moreover, these cords are supplied silicone twisted. These twists have not a decorative role. They are essential for the proper functioning of the
device. Regularly check they are tight. If necessary, feel free to tighten these twists.
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