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Simple LM340 question

P

Peter

Jan 1, 1970
0
I'm using 6 LM340 (5-volt) regulators with the input voltage driving all of
them and the outputs driving seperate loads.

The datasheet specs 0.22uF capacitors on the input; since all the inputs
are connected in parallel, does this mean I should use one capacitor of
1.32uF (6 * 0.22uf) ?
 
P

Palindrome

Jan 1, 1970
0
Peter said:
I'm using 6 LM340 (5-volt) regulators with the input voltage driving all of
them and the outputs driving seperate loads.

The datasheet specs 0.22uF capacitors on the input; since all the inputs
are connected in parallel, does this mean I should use one capacitor of
1.32uF (6 * 0.22uf) ?
The datasheet goes on to say that the input capacitor is not needed at
all, if the LM340 is close to the power supply filter.

If there is already a decoupling capacitor across the power rail within
2-3 inches of track from the input pin, no need to add another. If there
isn't, add a 0.22uF. That capacitor then also acts as a decoupling
capacitor, when considering the need to add a capacitor to other
regulators. No need to increase its value.
 
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