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10BASET1L, EVAL-ADIN1100EBZ, Power over Data Line (PoDL)



		

			

									
					    inagore
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 7, 2025 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		        		    		    	
			
    Hi,
    

    There are some Evaluation Boards from TDK (EVB-DLA-00x) for PoDL which are designed to be used with EVAL-ADIN1100EBZ and EVAL-ADIN1110EBZ.
    

    First Question:
    

    There is a list of components which are used depending of the Power Class. 
    The only component that changes for each Class is the Differential-mode Choke Power Inductor (DMC), but shouldn't we also change the Common-Mode Choke (CMC)?
    In this case the used CMC (RCM70CGI-471) has a Ir = 700mA, how it can withstand the higher Classes currents?
    

     
    

    Second Question:
    

    The previous version of TDKs document (Product Brief 2024) didn't have the resistors in parallel in the CMC nor the capacitors. The new version (Product Brief 2025) do have them. Why are they needed?
    

     
    

    Thank you,
    
										

    
				The CMC is the RCM70CGI-471 and not the ICI70CGI-222
    
[edited by: inagore at 1:18 PM (GMT -4) on 10 Mar 2025]
				
    
						
			        
		
    

				
						
        

    
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                on Mar 12, 2025 9:49 AM
            
            
					
        
	
        

		
		
        
					
        Hi, 
        

        I have found that there is nothing wrong.
        

        For Class 15 (Current ~= 1.5A) the CMC is located after the DMC so the current is not going through the CMC (You don't need to meet the current).
        

        For other Classes (Class 10 to Class 14 < 700mA) the CMC is located just before the DMC and then the current is passing through it. (In these cases there is no problem because the CMC is 700mA rated and all these classes are rated less current).
        

        

         
        

        

        Thank you,
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
						
                            
            
            				
            
                on Mar 14, 2025 7:09 AM
            
            
												
						in reply to inagore
					
									
        
	
        

		
		
        
					
        Hi  
        

        Thank you for reaching out.
        

        1. Yes, that' correct. When the CMC is placed before the DMC, then the CMC must be rated to withstand the current, as the current will flow through it. When it's placed after the DMC, this requirement doesn't apply.
        

         2. The resistors R3 and R4 in parallel with the CMC are to avoid any possible self resonance. Removing them would probably be ok. R5 and R6 are draining resistors for C1 and C2. You could remove them, but they are recommended for draining.
        

        Regards,
        

        Shazia
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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