How can I make a current limiter circuit?

How can I make a current limiter circuit?

In case you do not have an access to the IC LM338 or if the device unavailable in your area, then you could simply configure a few transistors or BJTs and form an effective current limiter circuit for your LED. The schematic for the current control circuit using transistors can be seen below.

What is the purpose of a current limiting circuit?

Current limiting circuitry is a simple way of protecting circuits from high currents, while allowing high current devices to draw high current form the same power supply. The purpose of this application note is to introduce the concepts of current limiting and basic current limiting circuits.

Which is better series pass or current limit circuit?

Transistor current limited circuit. This circuit gives far better regulation than the straight emitter follower regulator. Also voltage drops in the series current limit sense resistor can be accounted for provided that there is sufficient voltage drop across the series pass transistor in the power supply circuit.

How to determine the maximum current in a short circuit?

There are a few equations that can be used to determine the key values of the circuit to provide the required maximum current for the linear voltage regulator, and also the foldback current level on a short circuit. For the maximum current from the linear voltage regulator: I max = 1 R 3 ((1 + R 1 R 2) V BE + R 1 R 2 V reg)

How does current limiter circuit reduce power overload?

In this way, the current is reduced the greater the overload, and thereby the risk of damage is reduced.

How is current limiting used in power supply ICs?

As the feature is normally incorporated into regulated power supply integrated circuits, the additional cost of using foldback limiting against constant current limiting is not noticeable. Accordingly foldback current limiting is virtually always used in these ICs.

Why is current limiting important in linear power supplies?

Current limiting is a key feature of all power supplies. With electronic devices being left powered up almost permanently and often left unattended, safety features like current limiting are essential in linear power supplies as well as switch mode power supplies.

How are bidirectional limiters used in circuit breakers?

A simple bidirectional limiter (Fig. 3) can be built just by choosing a SiC JFET that achieves the desired limit current. If designers want greater control over the current limit, they can add a ballast resistor to act as an end-stop to the current, at the expense of some continuous dissipation in normal operation.

How does a PTC-based current limiting circuit work?

A PTC-based limiting circuit requires a bypass circuit to send current back through the PTC thermistor to protect the system against shorts. By setting the bypass to 3 or 4 times the amount it takes for the inrush current to settle, response time for the PTC-based limiter is extremely fast.

How to calculate the current limiter resistor formula?

Calculating the Current Limiter Resistor The figure shows a variable resistor for setting the current control, however R1 can be replaced with a fixed resistor by calculating it using the following formula: R1 (Limiting Resistor) = Vref/current or R1 = 1.25/current. R1 wattage = 1.25 x current

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