Both functions are performed by the same serial transistor which is controlled by 2 error amplifiers: voltage and current.How do the manufactures of normal bench power supplies do both regulation and
adj. current limiting.
Yes LM339 is a comaprator with open colletor output, so the circuit shown in the first post will never work correctly. Basis of Q2 will just float when it's not pulled down by LM339. LM339 can never turn on the tranisistor because it's open collector.lastdance said:LM339 is a comparator with a open collector output, is that correct?
I posted that 3 days ago and it look it is still valid ..It is a strange design where you try to achieve two different functions (voltage regulation and current limit) using two connected in series stages.
It will just not work!!!
Then how about just placing the current limiter before the the voltage regulator. I have seen this done before with two LM317, so I suppose it works.lastdance said:0.31 ohm multiplied by the load current, let's say 3A, you got about 1V. your voltage output is supposed to stay regulated as much as possible, before hitting the 4A current limit. 1V is too much, it's gonna kill the load regulation.
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