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TLC5927: Leakage current

Part Number: TLC5927

Hi 

I am using constant sink LED driver for my application TLC5927 for LED display board. In my project it will be the main role. I have an issue. In hardware side one output pin of TLC5927  they have connected four LED's of cathode part, When I setting the data to only One LED for Multiplexing concept, that LED will glows bright but other three LED's will also glowing with dim actually it will be in OFF condition. I don't know  why happening like this. May i know when this type of issue will occur can any body help us. Please !!