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LM7805 voltage drop on load

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HagenK

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So I connected it between 9V 4.5A DC SMPS and external camera flash which requires 4xAA cells. To my surprise when flash is charging input current rises to 2.2A and voltage drops to about 2.5V. Is this normal?
 

The peak output current of a 7805 is listed as 2.2A on its datasheet, but its recommended output current is 1.5A. I'm a newb, but I would guess that your circuit is just drawing more power than the 7805 can handle (causing your voltage drop). I've linked the datasheet here

-Alex
 

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