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ltc4267 PoE - Current limit



		

			

									
						anand.m
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Jun 17, 2020 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi all,

We have designed a board with LTC4267 POE PD controller as per the reference design https://www.analog.com/media/en/reference-design-documentation/design-notes/dn361f.pdf


However we want to limit the current to 200mA, as our device does not consume more than 200mA. We planned to achieve better ripple performance by doing so. 
Kindly let us know the changes that needs to be implemented for the samel

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	














	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Jul 13, 2020 5:17 AM
            
            
					
    
	
    

		
		
    
					
    Hi,
    

    Do you mean you want to build a LTC4267 PD that only supplies 5V / 200mA or that it only draws 200mA from the cable? Are you using the battery charger or just the LTC4267?
    

    You can increase the sense resistor value to limit the amount of delivered power to the secondary-side, and you can use a higher primary inductance transformer or perhaps a smaller transformer with the same characteristics.
    

    Best Regards,
    

    Eric
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 20, 2020 9:48 AM
            
            
												
						in reply to EHorsma
					
									
    
	
    

		
		
    
					
    Hi,
    Thanks for the info.
    

    Actually I want to build a LTC4267 PD that only supplies 5V @ 200mA.
    But there is no formula given in the datasheet  to calculate the sense resistor value.
    Do you know any other method to calculate the Rsense??
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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