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LM36274: several questions on function

Given Ding
Expert 8155 points
Part Number: LM36274
Other Parts Discussed in Thread: LP8556,

Hi Team, 

just want to check on several questions. 

1. what's the meaning of LED step ration in below? and what does below picture means? 

2.  in below picture, why doe headroom is step by step? does it means that the headroom adjustment has the minimum resolution？ 

     also, there is spike @ ~2mA, what's the reason for this? 

3. does LM36274 has " LED short " and " LED open" protection, similar with LP8556? 

BRs

Given