LTM8042

Question

Hi, 
 I'm use three LTM8042 LED Driver. 
 LED shape is like doughnut, 21LED is compented 7 series, 3 parallel. 
 when i control it by pwm, only one driver's output is large than others. 
 i have 5 controller, only one controller happen this situation. 
 maybe it d efective product? 
 
 below img is driver circuit. 
 /resized-image/__size/640x480/__key/communityserver-discussions-components-files/330/4520.pastedimage1634545067064v1.png 
 
 Best regards, 
 Mark.

ADIApproved · Accepted Answer

Hi Mark, 
 Does one controller contain the three LTM8042 LED drivers? If yes, it could be a manufacturability issue since only one has an issue. You could try replacing the IC with issue with ICs from your other working controllers to identify if the problem is the IC or board. Double check your connections and components.)

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