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LT8611 damaged with absent input voltage



		

			

									
					    ThomasStunder
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 25, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    

    we are using the LT8611 for charging a 12V lead acid battery.
    

    When the  24V input voltage is removed the LT8611 will be destroyed. 
    

    We added a diode like the recommendation from the LT8611 datasheet (page 18, figure 5) but this didn´t prevent the fault of the LT8611 when the input voltage is absent.
    

    

    The schematic is attached below.
    

    

    Any help is greatly appreciated,
    

    

    Thomas
    

    

    PDF
    
										

    
				correct spelling of Subject "damaged"
    
[edited by: ThomasStunder at 10:49 AM (GMT 0) on 3 Jul 2020]
				
    
					
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Jul 8, 2020 5:23 AM
            
            
					
      
	
      

		
		
      
					
      Hi Thomas,
      

      Thanks for use of LT8611 and the information.
      

      One of the possible sources, which causes the damage in battery charging application, comes from the reserve current, suddenly stepping up the voltage stress and exceeding the allowed max voltages on some pins.
      

      The simple solution to this problem is to add a forward-biased diode between the output of the part and the battery.
      

      If additional information is needed, please let me know.
      

      Best regards,
      

      Chuan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Jul 8, 2020 5:23 AM
            
            
					
      
	
      

		
		
      
					
      Hi Thomas,
      

      Thanks for use of LT8611 and the information.
      

      One of the possible sources, which causes the damage in battery charging application, comes from the reserve current, suddenly stepping up the voltage stress and exceeding the allowed max voltages on some pins.
      

      The simple solution to this problem is to add a forward-biased diode between the output of the part and the battery.
      

      If additional information is needed, please let me know.
      

      Best regards,
      

      Chuan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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