D.A.(Tony)Stewart
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Okay now you're just shifting the goalposts. If you compare it against general PWM controllers of course you'll find cheaper parts (also linear tech is always a bit expensive...), but then you don't have important things like built in brightness control or open output protection. If you don't need those features then why do you desire LED control chips in the first place?LT3755 is $3.7 for 5000 pieces on digikey.
-thats a bit too expensive.
Yes and this is a problem. Linear tech never specifies their internal slope compensation. Every time I use one of their current mode control chips I send an email asking them to provide that info, never get a clear response.The LT3755 And lt3756 datasheets dont tell exactly how much internal slope compensation is added
Well this is mainly an issue with loop compensation. If the line drops, then the converter will want to draw more current no matter what. Current mode should have less overshoot and faster settling time than voltage mode.Also Automotive load dump can whack up the input voltage drastically and again cause huge sudden overcurrents, again needing a good current sense to stop it.