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Why do we need to add capacitance to l7805cv

elecfans | 04/06/2021

What is L7805CV?

L7805CV is a positive voltage regulator with an output voltage of 4.75-5.25V and a quiescent current of 4.2-8mA. Its output current can reach 1.5A, no external compensation components are needed, and the built-in current limiting protection current prevents the components from being burned by the short circuit of the load.

Features:

The output current can reach 1.5A

No need for external compensation components, including current-limiting protection current,

Prevent the load from being burnt due to short-circuit of the load. The component contains a high temperature and overheating protection circuit,

Prevent the junction temperature from overheating and destroying the power consumption limiting circuit in the device,

Prevent burning of output driver transistor

Why do L7805CV add capacitors

Add a capacitor near the input terminal in order to prevent self-excitation. The output of the 7805 does not require adding capacitance. The capacitance is added for the needs of the load, which can reduce the dynamic internal resistance. These are mainly because the load size should be paid attention to during the use of 7805, and it is easy to damage L7805 when there is no load.

What is the effect of not connecting the capacitor to L7805CV

In the DC power supply circuit, there is no big problem with the filtering of the power supply and what capacitor is connected to the bypass capacitor, as long as the capacity withstand voltage and polarity meet the requirements. The figure shows a non-polar capacitor, which is used for bypass surges and interference peaks. , Connecting it can make the voltage regulator block work stably, not connecting it will not affect the voltage regulation effect.

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