The IC belongs to 78xx voltage regulator family which is commonly used as the regulated power supply in electronic circuits The IC is not as popular as ic The voltage regulator IC is ease-of-use and available in very low cost. The last two digits of indicates the output voltage that is voltage. The regulator line is a positive voltage regulator that is the voltage regulator ic generate the voltage which is positive with respect to the common ground. In case if both the positive and negative voltage supply is needed in the same circuit.
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They have built-in current limiting and over temperature protection and tend to be fairly robust devices. The prefix may vary depending on the mfr so you may see them listed as LM78xx, MC78xx, L78xx or just 78xx. Basic Operation The is a commonly used linear regulator. For basic operation, no external components are required. Just hook up the input voltage and ground and you have 9V available on the output.
The part ideally should be a low ESR part such as a Tantalum or Mylar capacitor, but small electrolytic caps generally work fine. An output capacitor of 0. The reason is that the linear regulator uses a series pass transistor on its output to drop the excess voltage.
The larger the voltage difference is between Vin and Vout, the higher the power dissipation will be which limits how much current can be drawn from the device. The TO package will need to dissipate 3W of power.
Under typical conditions, the device can dissipate about 1 — 1. As a general rule, you always want to use as low of an input voltage as possible to minimize power loss though the device and maximize the output current available. Notes: The tab of the is common with the Ground pin. Under high current loads or with large input to output voltage differentials, the device can get very hot, so use care when handling.
LM7809 Fairchild Semiconductor, LM7809 Datasheet