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ADuM4135 Production
The ADuM4135 is a single-channel gate driver specifically optimized for driving insulated gate bipolar transistors (IGBTs). Analog Devices, Inc., iCoupler...
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ADuM4135 on Analog.com

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ADUM4135: Fault reporting issue



		

			

									
					    alexshei
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 27, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  adum4135 
    
    		        		    		    	
			
    Hi,

    I've noticed one weird problem. When desat events happens the Fault pin goes 2.5V instead of going to zero. What could be the cause of this problems?

    The schematic of my driver is as below:
    

      


    Best regards,
    Alex Shein, Tsinghua University
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Jul 27, 2022 10:29 AM
            
            
					
      
	
      

		
		
      
					
      Hello Alex,

      I can't see any issue in the schematic you shared.
      The ADuM4135 pull-down FET resistance is 11Ohm, so the line should go near 0V with a 10k pull-up during a fault event.  

      I would recommend to debug the issue at board level, starting by disconnecting everything from pin 5 other than the 10k pull-up, in order to isolate the issue.

      thank you,
      Luca
         

      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Jul 27, 2022 10:29 AM
            
            
					
      
	
      

		
		
      
					
      Hello Alex,

      I can't see any issue in the schematic you shared.
      The ADuM4135 pull-down FET resistance is 11Ohm, so the line should go near 0V with a 10k pull-up during a fault event.  

      I would recommend to debug the issue at board level, starting by disconnecting everything from pin 5 other than the 10k pull-up, in order to isolate the issue.

      thank you,
      Luca
         

      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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