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ADUM4190 Production
The ADuM4190 is an isolated error amplifier based on ADI, iCoupler® technology. The ADuM4190 is ideal for linear feedback power supplies. The primary side...
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ADUM4190 on Analog.com

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Isolator-Feedback Circuit



		

			

									
					    Sals
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 16, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  ADum4190 
    
    		        		    		    	
			
    Hello Everyone
    

    I want to design a feedback circuit for ADum4190, the input would be the duty cycle voltage from my circuit board. I want to build a curcuit which when the voltages drop to zero does not shut down the system as the input voltage range for ADum is 0.35 to 1.5V. If this voltage drops to zero how can i design a circuit so that the feedback circuit react and keep it in the power mode?
    

    Thanks
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Mar 28, 2023 12:08 AM
            
            
					
      
	
      

		
		
      
					
      Hello,
      

      

      Are you asking to have a circuit that will always output a voltage on the output pin? The input voltage range of the ADuM4190 refers to the range where the linearity of the input to output transfer function will be within the specified accuracy. If you deliver an input of less than 0.35 V, the ADuM4190 will still have an output, but the gain error might be outside of the datasheet limits.
      

      

      If you are looking to have a minimum voltage present at the output pin at all times, you might be able to use a wired OR with a low voltage on the second leg.
      

      

      RSchnell
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Mar 28, 2023 12:08 AM
            
            
					
      
	
      

		
		
      
					
      Hello,
      

      

      Are you asking to have a circuit that will always output a voltage on the output pin? The input voltage range of the ADuM4190 refers to the range where the linearity of the input to output transfer function will be within the specified accuracy. If you deliver an input of less than 0.35 V, the ADuM4190 will still have an output, but the gain error might be outside of the datasheet limits.
      

      

      If you are looking to have a minimum voltage present at the output pin at all times, you might be able to use a wired OR with a low voltage on the second leg.
      

      

      RSchnell
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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