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LT3743 Production
The LT3743 is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. The average current mode controller will maintain...
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LT3743 on Analog.com

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LT3743 : Current Difference between channels.



		

			

									
					    MrBogus
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 11, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I use two LT3743 on one board.
    

    When output 6A, the difference of channels is about 300mA.
    

    CH-A is normal, CH-B is low current.
    

    

    This phenomenon didnot occur on large boards, but this phenomenosn occurs on small boards( 1/4 size)
    

    

    As a result of the test, it seems to be determined by the stage after the output mosfet.
    

    drive.google.com/.../view
    

    https://drive.google.com/file/d/1KJdcxujOw4950-dG5erYFg_IxdSYa-Fj/view?usp=sharing
    

    

    (It is not a difference in Mosfet device. I tried intalling SWAP, but the result is the same)
    

    

     https://drive.google.com/file/d/1QBbIbor2TW7Pd0oxRX0zVmSpcIGH6zzt/view?usp=sharing
    

    
										

    
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[edited by: MrBogus at 4:44 AM (GMT -5) on 11 Dec 2021]