LM431 PDF

The output voltage of this IC is may be ranged from the above 2. Due to the quickly activate characteristics, this IC is an outstanding alternative for several applications of Zener diode. The main function of the crowbar circuit is to prevent the circuit from the overvoltage power supply condition. The can be functioned by connecting a short circuit otherwise low resistance lane across the output voltage. Once activated, they can be rest on the current preventing power supply circuitry otherwise, if that stops working, the line fuse blowing otherwise circuit breaker tripping.

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LM is a regulator IC featured with adjustable output voltage. It is a 3-terminal shunt regulator with guaranteed temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2. Due to the sharp turn-on characteristics this device is an excellent replacement for many zener diode applications. LM can be configured in many application circuits and a few are stated in the datasheet. It popular application include,. Before going for application circuit of LM , let us first understand the internal working of the device and for that consider the functional diagram of the device as shown below.

Whenever the output crosses threshold threshold is value determined by R2 and R3 value the op-amp get feedback via Vref and it drives the transistor ON.

When the transistor turns ON the device draws current and because of this current drawing a voltage drop appears across R1 resistor which is in series with voltage source V1. Here Ic is the current drawn by the transistor.

Also the current draw by op-amp and resistor network is neglected for easy explanation. So in the final result Vo will always be adjusted to float near the measured value by op-amp setup or LM In a similar way we can setup other application circuits. Subscribe to stay updated with industry's latest Electronics components and news. Pin Configuration LM has three pins and function of each pin is mentioned below. Now let us consider a simple application circuit for the device as shown below: Here reference voltage Vref is the voltage at the non-inverting terminal of the op-amp and this voltage determines whether the op-amp outputs positive voltage or not.

Also Vref is the voltage at the midpoint voltage divider network formed by the two resistors R2 and R3. Component Datasheet. LM Datasheet. Tags Shunt Regulator. Get Our Weekly Newsletter!

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