SNVA829 Simple Constant Current/Constant Voltage Buck Converter

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hoyyoth

Joined Mar 21, 2020
224
May I know how the equation is obtained for CC.I tried with nodal analysis but failed.

Can someone please help me.


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ronsimpson

Joined Oct 7, 2019
2,540
You do realize that you cannot achieve both CV & CC at the same time.
In the case of LEDs. Your supply will run in CC mode, and only switch to CV if the LEDs break open. Most CC LED drivers will make too much voltage with no load and things will brake if there is not a limit.

(with no load) You are looking at a buck where Vout will go to Vin. In the case of a flyback supply, Vout goes up without limit until the IC/transistor breaks.
 
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