Does a switching regulator effect the output of a buck converter with a fixed output voltage of +5 V like the L7805?

[FKamm.2]

I'm trying to design an voltage regulator on a motor control board. I want an output voltage of 5 VDC and the input voltage is 24 VDC. Because of heat production i was thinking about using a switching regulator like the L7983 followed by an L7805. But I'm unsure if the frequency of the switching regulator will effect the output signal of the L7805. I need the 5V for the microcontroller and the current sense amplifier.

Or is there an easier way?

Thank you very much

[Harvey White]

There's a replacement for the 7805 regulator, which is a 3 pin switching regulator to which you can add a filter. Check with Digikey, who seems to stock them. They're about 2-3 USD each, and can tolerate a higher input voltage. Haven't use them in a design yet.