So what about the heat generation or power dissipation of a Low-Drop-Out voltage regulator...?

The voltage regulator **LM2940**
has an internal construction
comparable with the voltage regulator **78xx**.
Therefore the **power dissipation** of the **LM2940**
is described approximately by the **formula**...

P_{D} = (U_{in} - U_{out})
× I_{out}

= (9.0 V - 5.0 V) × 0.50A = 2.00 Watt.

While pressing the push-button switch **S1**
the **load resistor R1**
and the **voltage regulator**
become, as in the **Experiment 7**, very hot!

The **advantage** of a **Low-Drop-Out** voltage regulator
does not lie in the overall **power dissipation**.
Only at an input voltage
**V _{in} = 5,5 V**
is the

P_{Dmin} = (V_{DO})
× I_{out}

= 0.5 V × I_{out}

This is now much less than that of a **78xx**...

With applications in closed, narrow environments this can
be the **decisive argument**
for a **Low-Drop-Out** voltage regulator...

Now you continue with **adjustable** voltage regulators...