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how to switch some high power LEDs quickly?

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MQuadros

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Hey guys, I'm trying to use the LT3741 to regulate some high power LEDs at a constant current. I need to sync the lights to an external trigger. I'm having trouble getting the typical application circuit to run any higher than 40 or so Hz. I noticed that at high frequencies there is a dominating DC offset. Any ideas on how to drive this guy a little harder?

[/ATTACH]Datasheet/3741fb.pdf
 

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RT & SYNC pins set correctly?
 

Witch Soft Start capacitor do you use? 100nF? That value affetcs to off-on time. For a 1,5nF the off-to-on time is about 300us. Check last plot in page 9.
 

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