Rozrahunok microcircuit lm317. Integral Voltage Stabilizer LM317

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Good afternoon. Let's take a look at the integral linear regulated voltage stabilizer (or strum) LM317 at a price of 18 cents apiece. At a local store, such a stabilizer cost is much larger, so I have booked the whole lot. After reviewing what is being sold for such a price, it turned out that the stabilizer is completely clear, but about the price lower.
In looking around, testing in the voltage stabilizer mode and the struma, as well as rechecking the heat in the event of overheating.
Quiet, who got stuck, please ...

Trochy of theory:

Stabilizers buvayut linearі impulse.
Line stabilizerє dilnik of the voltage, on the input of which the input (unstable) voltage is applied, and the output (stabilized) voltage is taken from the lower shoulder of the dilnik. Stabilization is carried out with a path, change the support of one of the shoulders of the dilnik: the support is constantly adjusted so that the voltage at the output of the stabilizer is at the installed boundaries. At great anniversary values of input/output voltage, the linear stabilizer may have a low CCD, so the greater part of the tension is Prass = (Uin - Uout) * It appears at the sight of heat on the regulating element. To that the regulating element is to blame for the mother's ability to rise enough tension, so that the necessary space is installed on the radiator.
Perevaga linear stabilizer - simplicity, number of shifts and a small number of twisted details.
Nestacha- low KKD, great thermal vision.
Impulse stabilizer voltages - this is a voltage stabilizer, in which the regulating element works in the key mode, so it can be seen as a key for most of the hour or in the power mode, if it is maximum or in the power mode - with a minimum support, and therefore, it can look like a key. A smooth change in the voltage is felt by the obviousness of the integrating element: the voltage moves in the world of energy accumulated by it, and it decreases in the world of its energy. This mode of operation allows you to significantly change the energy consumption, as well as improve the weight and size indicators, however, it has its own peculiarities.
Perevaga pulse stabilizer - high CCD, low heat output.
Nestacha- The number of elements is great, the presence of a change.

Hero look back:

The lot is made up of 10 microcircuits at the TO-220 case. Stabilizers came in a plastic bag wrapped in polyethylene back.

Porіvnyannia s singly naivіdomіshim linear stabilizer 7805 for 5 volts in the same case.

Testing:
Similar stabilizers are released by bagatma pickers, axis .
Raztashuvannya nizhok such:

1 - regulation;
2 - out;
3 - entry.
We choose the simplest voltage stabilizer according to the wiring diagram:

The axis of which should be taken away at 3 positions of the change resistor:

Results, let's say so, not much. You can't call the language a stabilizer.
Dali I navantazhiv stabilizer 25 Ohm resistor and the picture changed completely:

Then I checked the reliability of the output voltage in the voltage stream, for which I set the input voltage to 15V, using a sub-string resistor output voltage close to 5V, and out with a change of 100 ohm wire resistor. Axis what happened:

Strum more than 0.8A was not taken away, because the input voltage began to drop (BP is weak). As a result of this test, the stabilizer with the radiator heated up to 65 degrees:

To recalibrate the robotic stabilizer strumu, an offensive scheme was chosen:

The replacement of the changeable resistor I have chosen the post, the axis of the test results:

Stabilization of the strum is also good.
And how can you look around without spalling the hero? Therefore, I selected a new voltage stabilizer, applied 15V to the input, adjusted the output to 5V, tobto. 10V fell on the stabilizers and turned on 0.8A, tobto. 8W of tension was seen on the stabilizers. Removed the radiator.
Demonstrating the result on the upcoming video:

So, the protection against overheating also works, the stabilizer did not burn out.

Podbag:

The stabilizer is a cycle of practicality and can be vikoristany as a voltage stabilizer (for the obvious tension), so it is a struma stabilizer. Also, there are no other schemes of zastosuvannya for zbіlshennya vyhіdnoї natuzhnostі, vikoristannya yak charger outbuilding for accumulators and in. The versatility of the subject is generally acceptable, safe, that offline I can buy such a minimum for 30 rubles, and for 19 rubles, which is much more expensive for looking around.

On whom let me bow, good luck!

I will look around the store for the goods for writing. Looking back published in accordance with clause 18 of the Site Rules.

Plan to buy +33 Add in the frame A look worthy +59 +88

I have a thought, what important parameter lively light emitters have a stable voltage. However, it is not so. For light-hearted people stable strum, For the very same reason, light-emitting diodes are called strum fittings. Duzhe simple, cheap, but at the same time nadіyny i tension stabilizer strumu can buti urges on the base integrated circuits(IM) lm317.

Short description lm317

Integrated circuit lm317 - ce regulation stabilizer especially for the implementation of the circuits of the lifeline with a stable output voltage or a strum. The microcircuit allows you to live with a strum up to 1.5 amperes in the voltage range from 1.2 to 37 volts. May vbudovaniyah zahist vіd revantazhennya that short hum.

An analogue of the Russian virobnitstv - KR142EN12A.

Main characteristics:

the range of the value of the regulated output voltage - vіd 1.2 to 37;
maximum indicator strum advancement- Up to 1.5 A;
maximum allowable input voltage - 40V;
the presence of awakening from overheating, overwhelming that possible short zamikannya;
indicator of a possible abduction of stabilization is approximately 0.1%.

The lm317 is available for a monolithic case and deck options. The widest є ІМ for the TO-220 body with an additional index t for the marking (lm317t).

LM317 has three visnovki:

ADJUST. Visnovok for zavdannya (adjusting) output voltage. In the mode of stabilization, the struma is closed from the plus of the exit contact.
OUTPUT. Visnovok with a low internal support for molding the external tension.
INPUT. Visnovok for the tension of life.

Scheme

The simplest circuit of the stromu stabilizer (driver) consists of two components: ІМ lm317t and a resistor. At the input of the IM, a voltage is applied to the voltage supply, the contact that controls it is connected to the output through a resistor (R), and the output contact of the microcircuit is connected to the anode of the light diode.

Opir resistor razrakhovuyut for this formula:
R \u003d 1.25 / I 0 (1), de I 0 - stabilizer output stream, the value of which is regulated by passport data on LM317 and can be in the range of 0.01-1.5 A. range 0.8-120 Ohm. The tension, which rises on the resistor, is developed according to the formula:
P R =I 0 2 ×R (2).

Otrimani rozrahunkovі data for the resistor are rounded off at the big side, zgіdno with the nominal number.

The constant resistors vibrate with a small amount of support, so it is possible to take the necessary value of the external stream. For this purpose, an additional substring resistor is installed in the circuit. All three reduce the cost of choosing a stabilizer, and also guarantee the removal of the necessary struma for the life of light. With the stabilization of the output stream more than 0.3 amperes, a lot of heat is seen on the microcircuit, so it is necessary to provide a radiator.

Operate the LM317 on a stream close to the boundary (1-1.5 A) unnecessarily. In the first place, it is necessary to have a radiator of great roses, in order to spread the warmth of ІМ, which is seen. In another way, the robot at the maximum allowable stream speed up the exit from the fret of the microcircuit.

Milking often due to the need for simple stabilizer voltage. This article contains a description of the application of an inexpensive (price for LM317) integrated voltage stabilizer LM317.

The list of rozv'yazuvanih zavdan given stabilizator dosit great electronic circuits, radio-technical attachments, fans, engines and other attachments in the form of electrical installations or other voltage sockets, for example, a car battery. The most extensive schemes for voltage regulation.

In practice, for the participation of LM317, it is possible to induce a voltage stabilizer for a sufficient output voltage, which is in the range of 3 ... 38 volts.

Technical characteristics:

Voltage at the output of the stabilizer: 1.2 ... 37 volts.
Strum vitrimuє navantazhennia up to 1.5 amperes.
Accuracy of stabilization - 0.1%.
Є vnutrishnіy zakhist vіd vypadkovy short zamikannya.
Vidmіnniy zakhist vіd іntegrаlії stabilizаlії vіd pozhlyuyu pozhіvu.

Pressure drop and input voltage of stabilizer LM317

The voltage at the input of the stabilizer is not responsible for overshooting 40 volts, and also one more mind - the minimum input voltage can overvoltage the power supply by 2 volts.

The LM317 microcircuit in the TO-220 package is stable and stable for a maximum charge current of up to 1.5 amperes. If you do not stop the heat supply, then the value will be lower. The pressure, which is seen by the microcircuit in the process of robots, can be estimated approximately by the way of the strum strength at the output and the difference between the input and the output potential.

The maximum allowable pressure rise without heat input is approximately 1.5 W for normal temperatures above 30 degrees Celsius. With the provision of good heat supply to the LM317 case (no more than 60 gr.), the tension that rises can become 20 watts.

When placing a microcircuit on a radiator, it is necessary to insulate the housing of the microcircuit from the radiator, for example, with a mica gasket. Also, for the effective introduction of heat, it is necessary to vicorate the heat-conducting paste.

Support for stabilizer LM317

For precise operation of the microcircuit, the total value of the supports R1 ... R3 is required to create a jet of approximately 8 mA at the required output voltage (Vo), so:

R1+R2+R3=Vo/0.008

The value should be taken as ideal. In the process of selecting supports, a small allowance is allowed (8 ... 10 mA).

The value of the support of the variable R2 without intermediary with the range of the output voltage. Sound yogo opir can be about 10 ... 15% of the total support of resistors that are missing (R1 and R2) or you can choose yogo opir experimentally.

The expansion of the resistors on the board may be sufficient, but for better stability, the expansion is given to the heatsink of the LM317 microcircuit.

Stabilization and defense of the scheme

Capacitance C2 and diode D1 are not binding. The diode protects the LM317 stabilizer from the possible reversible voltage, which is found in the designs of various electronic devices.

The location of C2 does not only slightly change the voltage of the LM317 microcircuit by changing the voltage, but also lowering the influx of electrical guidance, with the placement of the stabilizer board near the city, which may be harder to electromagnetize the industry.

Yak Bulo was assigned a higher, limiting the maximum possible power stream for the LM317 to become 1.5 amperes. The variety of stabilizers is similar in operation to the LM317 stabilizer, but more insurance is available bigger strum vanity. For example, the LM350 stabilizer strums up to three amps, and the LM338 up to five amps.

To ease the adjustment of the parameters of the stabilizer, use a special calculator:

(advanced: 4,697)

(advanced: 1,553)

Let's look at the simplest option for preparing a light-emitting driver with your own hands from the minimum hours. For the rozrahunka of the LM317 struma stabilizer for the light diodes, there is a calculator, for which it is necessary to indicate the necessary struma strength for the LED diodes. Place the scheme of turning on the light diodes in front, protecting the maximum tension of the microcircuit and the block. Look ahead for a cooling system for all designs.

1. Calculator
2. Connection diagram
3. Butt of rozrahunkiv and folding
4. Basic electrical characteristics
5. Impulse drivers

Calculator

Connection scheme

For the preparation of the stabilizer of the struma on the LM317, with the possibility of adjusting the replacement of the constant resistor, put a harder changeable opir. The nominal value of the replacement support can be determined by specifying the adjustment interval calculator. Opir can be from 1 to 110 Ohm, depending on the maximum and minimum. But I recommend that you take a look at the Ampere regulation at the destination change support. It will be correct to implement it smoothly and it will be a great heating.

The potency of the constant resistor for the heat dissipation is due to the reserve, calculated according to the formula:

I² * R = Pw
the force of the struma at the square is multiplied by the opir of the resistor.

As a living block, it is possible to vicorate a transformer or impulse dzherelo voltages with polarity. How vipryamlyach is more likely to vikoristovuvat the classic day place, after such a high-capacity capacitor is installed.

The strum regulator is not based on the linear principle, so it can get very hot through a low CCD. The appearance of a decent radiator is obov'yazkovaya. As well as controlling the heating by showing a low heating temperature, it can be changed.

If the number of Amperes is more than 1.5A, then the standard circuit needs to add a couple of elements. You can take up to 10A by installing hard transistor KT825A is a 10mu resistor.

This option is suitable for those who have no LM338 or LM350.

Strum stabilizer option for 3A is powered by KT818 transistors.

Butt of rozrahunkiv and folding

You really want to pick a brother, but you don’t have a living block, so you can choose some options. Name the power supply and connect the circuit to the battery on a 9V Kron type. The photo shows the whole scheme for choosing a light-emitting diode.

If 1A is required for light diodes, then it is indicated in the calculator that the result is 1.25 ohms. There is no resistor of this rating, so we can install it with a nominal value of Om. Another option last connection resistors. Correctly connecting the sprat of supports is taken required quantity Ohm.

Your stromu stabilizers on the LM317 will be similar to the lower feed strum.

And if you suffer from the latest light fanaticism, then we look like this.

Basic electrical characteristics

I recommend not to operate the LM317 on the boundary modes, Chinese microcircuits do not have a reserve of power. It’s obvious that there will be a short flicker and overheating, but don’t worry about it.

As a result, revantation can win not only LM317, but also those that are connected to it, but we still need another mix.

Main parameters of LM317:

heating up to 125°;

short circuit controller.

If you don’t have enough space in 1A, you can install more advanced models of stabilizers LM338 and LM350, 5A and 3A depending.

For additional heat transfer, the TO-3 case, which is often used in radio transistors, is used. Ale is issued in a small building TO-220, which is insured for less money.

Parameters of LM338:

zahist in the event of overheating and that short hum.

Impulse drivers

Zavdyaki chinese practicality blocks of life, stabilizers of struma and voltage can be bought from foreign online stores for 50-150 rubles. The regulation is induced by a small replacement support, at 2-3 amperes the stench does not deactivate the radiator for cooling the driver controller. You can borrow, for example, on the popular Aliexpress.com bazaar.

I often joke on Avito at my place, the way is quick and inexpensive. I'm the one who says a lot of other stabilizers from the reserve, they will be wrong. Then we sell the loan for scams, and you can always bargain.

Integral, regulation LM317 is not suitable for the design of clumsy regulation tubes and, for electronic equipment, with different output characteristics, both with a regulated output voltage, and with a given voltage strum vanity.

To facilitate the analysis of the necessary external parameters using the LM317 specialization calculator, you can get it for the help of the statistics for example from the LM317 datasheet.

Technical characteristics of the stabilizer LM317:

Security of external voltages from 1.2 to 37 st.
Strum supply up to 1.5 A.
The appearance of a zahistu in the form of a short zamikannya.
Nadіyny zakhist of microcircuits for overheating.
Exhaust voltage loss 0.1%.

Purpose of visnovkіv microcircuit:

Online calculator LM317

Below views online calculator for the expansion of the voltage stabilizer on the basis of LM317 At the first stage, on the basis of the necessary output voltage and the support of the resistor R1, the expansion of the resistor R2 is carried out. In another way, knowing the support of both resistors (R1 and R2), you can calculate the voltage at the output of the stabilizer.

Calculator for rozrahunku stabilizer strum on LM317 marvel.

Apply the installation of the LM317 stabilizer (marking diagrams)

Struma stabilizer

Denmark struma stabilizer can be stuck in the schemes of various chargers batteries or regulation dzherel zhivlennya. Standard scheme the charger is pointed below.

Required weekend strum:	BUT

Resistor R:	Ohm