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5v cc source

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quadzillatech:
hi all,im trying to find a simple way to get 5v at 1300ma from a 7805 any ideas?,cheers m3vuv.

Benta:
Use a 78S05 (ST).

quadzillatech:
maybe i should of said,i can get 1.5 amp from a 7805,the issue is it cant go over 1.3amp max,its how to limit the current to that im stuggling with.

Zero999:
There's no way to get 5V at 1.3A into any load, due to Ohm's law.

You need to have two modes: constant current and constant voltage.

The LM7805 isn't guaranteed to output any more than 1A, but will most likely give 2.2A peak.

http://ee-classes.usc.edu/ee459/library/datasheets/LM7805.pdf

The only way to set the current something else is to add transistor and a sense resistor before the LM7805. If a very accurate current limit is required, then you'll need a voltage reference and op-amp, as well. The downsides are it increases the drop-out voltage, as well as requiring more components.

jeroen79:

--- Quote from: quadzillatech on March 23, 2019, 04:54:59 pm ---maybe i should of said,i can get 1.5 amp from a 7805,the issue is it cant go over 1.3amp max,its how to limit the current to that im stuggling with.

--- End quote ---
What exactly are you trying to do? What is it that you want to accomplish?

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