The LM series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 3A over a 1. They are exceptionally easy to use and require only 2 external resistors to set the output voltage. Further, both line and load regulation are compa- rable to discrete designs. Also, the LM is packaged in standard transistor packages which are easily mounted and handled.
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This pins adjusts the output voltage 2 The regulated output voltage set by the adjust pin can be obtained from this pin 3 The input voltage which has to be regulated is given to this pin Adjustable 3-terminal positive voltage regulator Output voltage can be set to range from 1. But one shortcome of that IC is that it can source only a maximum of 1. So, if you are looking for a variable voltage regulator to set voltage between 1.
Apart from thus the IC also has current regulator mode which makes it suitable for battery charging applications. It has many application circuits in its datasheet, but this IC is known for being used as a variable voltage regulator.
As said earlier the IC has three pins, in which the input voltage is supplied to pin3 VIN then using a pair of resistors potential divider we set a voltage at pin 1 Adjust which will decide the output voltage of the IC that is given out at pin 2 VOUT. Now to make it act as a variable voltage regulator we have to set variable voltages at pin 1 which can be done by using a potentiometer in the potential divider. The Resistor R1 should be R and the potentiometer can be upto 10k together creates a potential difference at adjust pin which regulates the output pin accordingly.
The value of Iadj will be 50uA always since the reference voltage is 1. Once easy way to do this, is to use this online calculator to randomly substitute the value of resistors you have and check which output voltage you will get.
Used for Positive voltage regulations Variable power supply.
Fonte Ajustável com Lm350+Tip147 1.2 – 33V – 4A