The above condition causes the LED at the output to switch ON due to a low logic from the IC output. Remember, normally this should have caused the output to become high, but in IC LM339 the output turns low because of the internal transistor which inverts the response for the output of the IC. As long as the potential at pin 5 stays over 3 volts the output stays high, and the moment it drops below 3 volts the output of the IC turns low. The inverting input pin4 of the fixed with 3V reference by the voltage divider network formed by R1, R2. In the next figure above we can find how the IC LM339 can be configured as a non-inverting comparator-circuit. Observe that pin 3 is the positive input supply pinout while pin 12 is the ground supply pinout of the IC. The pinout of the IC LM 339's pinout can be seen in the figure below. The output of he IC is an open NPN collector and is designed to tolerate a short circuit to ground without getting damaged. The input voltage supplied to the input pins of the IC LM339 could be as high as the supply voltage. The quiescent current drain of the IC is incredibly low (generally under 1 mA) and it is not dependent on the supply voltage input. These comparators are built to work from a single dual voltage supply source, which can be anywhere of 2 V to 32 V. It is basically a quad comparator IC, meaning we can find four numbers of individual voltage comparators in a single 14-pin package of LM339 IC.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |