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LT8650S Recommended for New Designs
The LT8650S is a dual step-down regulator that delivers up to 4A of continuous current from both channels and supports loads up to 6A from each channel...
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LT8650S on Analog.com

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Adding 68µH inductor before EMI filter at input

		
	
				

			

									
					    mehdiaghayi
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 7, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user asked if adding a 68μH inductor (SRN4018BTA-680M) before the EMI filter on the LT8650S demo board (DC2407A) is recommended to reduce conducted emissions. The final answer suggests using a CLC pi filter for EMI suppression and recommends designing the filter with LTPowerCAD to visualize conducted EMI. Experiments by the user found that adding a large inductor at the input made the LT8650S unstable and had no effect on EMC improvement.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  LT8650S  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello,
    

    In order to reduce conducted emission is it recommended to place a 68µH inductor (SRN4018BTA-680M) before EMI filter mentioned in (DC2407A) at the input voltage? 
    

    the switching frequency of LT8650S is 2Mhz and by which a CAN interface will be powered.
    

    Thank you!
    
			
    
			
									
		                             
                        

    
    
                                            
                 Datasheet/Specs
                
                                                    
                 emc
                
                                                    
                 Internal Power Switch Buck Regulators
                
                                                    
                 LT8650S
                
                                                    
                 Step-Down (Buck) Regulators
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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