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Voltage Regulator
f-alpha.net » Electronics » Integrated Circuits » Voltage Regulator » Let's go... » Experiment 8 - Heat Development II

Experiment 8 - Heat Generation of the Voltage Regulator II

Replace the load resistor R1 with 100 Ω, 5 Watt...

Input voltage Uin = 9 V

Circuit diagram heat generation voltage regulator 7805.

Circuit heat generation voltage regulator 7805. (Enlarge)

The power dissipation PD amounts to...

PD = (Uin - Uout) × Iout

     = (9 V - 5 V) × 0.05A = 0.20 Watt.

Neither load resistor nor voltage regulator heat up.

Input voltage Uin = 18 V

Circuit diagram heat generation voltage regulator 7805.

Circuit heat generation voltage regulator 7805. (Enlarge)

now the power dissipation PD amounts to...

PD = (Uin - Uout) × Iout

     = (18 V - 5 V) × 0.05A = 0.65 Watt.

The voltage regulator heats up, the load resistor remains unchanged.

So if your voltage regulator gets too hot, you should try to lower the input voltage!

However, you cannot lower the input voltage arbitrarily...

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