What is the significance of the input capacitance (680 uF) (uF = microFarad) at the input of the LM 2596 ? LM 2596 is step down voltage regulator.
Please refer: http://www.ti.com/lit/ds/symlink/lm2596.pdf
The 680 uF (microfarad) capacitor is the leftmost capacitor on the circuit on page 1. Usually to 'kill' the high frequency noise from supply voltage 0.1 uF is used. I am sure 680 uF serves different purpose. What is that ?
Any intuitive explanation would be great.