Power Supply Filter Capacitor Size

[Haible Juergen]

	>>Regulator power dissipation (read heat) is reduced by matching
	>>the capacitor to the load. The regulator does not have to
dissipate
	>>the constant excess input voltage and as log as the bottom
	>>of the "ripple" is above the dropout voltage, it should show the
	>>power supply ripple rejection the regulator is rated for.
	>>
	>.....can this be true?
	>The dissipation in the regulator is the drop across the regulator,
	>multiplied by the current through it.
	>I mean, this is Ohms law in practice.
	>
	>For a normal three terminal regulator, ther is no such thing as 
	>matching the capacitor to the load, provided it is big enough, as
	>pointed out by the earlier posts.
	>
	>paul perry melbourne australia
	>

Grant is right. Higher ripple (at fixed maximum voltage) means lower
average voltage, lower average drop voltage, lower power consumption.

JH.